JP4062624B2 - Recording apparatus, recording method, and optical information recording / reproducing apparatus - Google Patents

Description

The present invention relates to a recording / reproducing apparatus capable of performing recording / reproduction of HDD, MO, DVD-RAM, DVD-RW, etc., and a recording apparatus, a recording method, and optical information for compressing / decompressing data. it relates to the recording and reproducing equipment.

  In general, a recording / reproducing apparatus using data compression / decompression technology, such as a conventional portable DVD player, for example, an MD has a shock proof memory of 4 MB (bit) corresponding to about 10 seconds. By temporarily storing the data, while the music signal is being reproduced from the memory, the pickup is kicked to wait for rotation for the sector to be reproduced next. During recording, the recording signal is temporarily stored in the memory and then temporarily stored, and this signal is read and recorded intermittently on the disk. The remaining time as pickup is kicked and rotated relative to the next sector to be recorded. I'm waiting.

Similarly, for example, a DVD player has a 4 MB temporary storage memory, and signal transfer is performed at a variable transfer rate. For example, at a transfer rate of 8 Mbps, a storage time corresponding to about 0.5 seconds is required. Have it, kick it in the same way and wait for the rotation. At present, it is common to use a DRAM with a storage capacity of 64 MB or more as such a temporary storage memory, and as a temporary storage time, 2 seconds or more should be secured. Can be made cheaper. Incidentally, 64 MB (bit) has a storage time of 8 seconds at 8 Mbps, and a storage time of 32 seconds at 8.8 Mbps at 256 MB. A technique for recording and reproducing a signal of one transfer rate using such a temporary storage memory is disclosed in, for example, Japanese Patent Laid-Open Nos. 59-172169 and 5-128531. Has been.
JP 59-172169 A Japanese Patent Laid-Open No. 5-128531 JP-A-10-98710

  By the way, a technique for reproducing or recording high-density information using a laser beam is known as described above, and is mainly put into practical use as an optical disk. Optical discs can be broadly classified into read-only, write-once, and rewritable types. The reproduction-only type is commercialized as a compact disc on which music information is recorded and VCD, DVD, etc. on which image information is recorded, and the write-once type is commercialized as CD-R, DVD-R, etc. Currently, CD-RW, DVD-RAM, DVD-RW, etc. are being commercialized as video, audio recording, data files for personal computers, etc. as rewritable types.

  In general, MPEG is used for compression of image signals and audio signals. Among them, VBR (variable bit rate) and one-pass and two-pass technologies have been developed to efficiently perform compression. Has been. For example, in this two-pass technique, a signal to be recorded at the time of creating a DVD video disk is temporarily stored in an HDD or the like, and data is obtained by re-compressing and re-recording the signal in a non-real time state over a certain time. However, there is no method for realizing this in real time on a device such as a video movie, and it is a problem that the user cannot compress it efficiently during the recording time. As a related patent, there is a technique disclosed in Japanese Patent Laid-Open No. 10-98710. This is a content related to the above-described technique, but a technique for realizing this in real time is not disclosed.

  The technique of this publication only discloses that two-pass control is performed using another large-scale storage device such as an HDD, and the technique for realizing the above-mentioned two-pass control in real time, or substantially a storage medium. A technology that realizes the above format using one storage medium is not disclosed.

The present invention has been devised to pay attention to the above problems and to effectively solve them. An object of the present invention is to provide an optical information recording / reproducing apparatus capable of performing two-pass control in substantially real time by a single storage system during recording on an optical recording medium. Another object of the present invention, for example while the user is unaware of one storage system, during idle time such as at night, it is possible to perform two-pass control, a recording apparatus, a recording method, an optical information recording and reproducing equipment Is to provide.

To solve the problems described above, the present invention relates to a recording apparatus according to the following configuration, a recording method, to provide an optical information recording and reproducing equipment.
(1) compression means for compressing an input signal such as audio or video at a first compression rate in predetermined block units;
Difficulty extraction means for extracting the compression difficulty of the input signal at the time of compression ;
Difficulty level storage means for storing the difficulty level;
Hand throwing the compressed first data sequentially into the temporary storage means;
Means for managing the area of the information recording medium ;
Means for writing data stored in a predetermined area of the information recording medium when the data stored in the temporary storage means reaches a predetermined amount;
During the step of storing in the temporary storage means, the compressed data stored in the information recording medium is read out, and the compressed data is read out according to the difficulty level value stored in the difficulty level storage means. and a second compressing means for compressing again at high have compression rate than the compression rate,
A recording apparatus for recording data compressed by the second compression means in a storage area of the information recording medium .
(2) compression means for compressing input signals such as audio and video at a first compression rate in predetermined block units;
Code amount extraction means for extracting the code amount of data at the time of compression;
Code amount storage means for storing the code amount;
Means for sequentially storing the compressed first data in a temporary storage hand throw;
Means for managing the area of the information recording medium ;
Means for writing data stored in a predetermined area of the information recording medium when the data stored in the temporary storage means reaches a predetermined amount;
During the step of storing in the temporary storage means, the compressed data stored in the information recording medium is read out, and the compressed data is read out according to the code amount stored in the code amount storage means. and a second compressing means for compressing again at high have compression rate than,
A recording apparatus for recording data compressed by the second compression means in a storage area of the information recording medium .
(3) An optical information recording / reproducing apparatus for recording / reproducing a digital signal on an optically recordable optical information recording medium,
Laser generating means for optically recording and reproducing information from a track;
Pick-up means for detecting the reflected light with a plurality of divided sensors;
Means for calculating each signal to obtain a reproduction signal and a servo error signal;
Focus control means for focusing on the signal surface;
Tracking control means for tracking the track;
Compression means for compressing the recording signal in a predetermined block unit at a first compression rate;
Difficulty extraction means for extracting the compression difficulty of the input signal at the time of compression ;
Difficulty level storage means for storing the difficulty level;
Temporary storage means for temporarily storing the compressed recording signal;
Data remaining amount management means for managing the amount of data stored in the temporary storage means;
Recording means for controlling to record the compressed recording signal on the optical information recording medium;
Area management means for managing areas recorded in the optical information recording medium;
The compressed data stored in the optical information recording medium is read out and stored in the difficulty level storage means during the stage of storing in the temporary storage means based on the data amount managed by the remaining data management means . depending on the difficulty value, and a second compression means for compressing again the compressed data at high have compression rate than the first compression rate,
An optical information recording / reproducing apparatus for recording data compressed by the second compression means so that a predetermined block unit is continuously connected on the optical information recording medium by the area management means.
(4) An optical information recording / reproducing apparatus for recording / reproducing a digital signal on an optically recordable optical information recording medium,
A laser generator hand stages for recording and reproducing information from an optically track,
Pick-up means for detecting the reflected light with a plurality of divided sensors;
Means for calculating each signal to obtain a reproduction signal and a servo error signal;
Focus control means for focusing on the signal surface;
And tracking control means to track in the track,
Compression means for compressing the recording signal in a predetermined block unit at a first compression rate;
Code amount extraction means for extracting the code amount of data at the time of compression;
Code amount storage means for storing the code amount;
Temporary storage means for temporarily storing the compressed recording signal;
And remaining data amount management means for managing the amount of data stored in the temporary storage Hand stage,
The compressed recording signal and recording means to control so as to record on the optical information recording medium,
Area management means for managing areas recorded in the optical information recording medium;
The compressed data stored in the optical information recording medium is read out and stored in the code amount storage means during the stage of storing in the temporary storage means based on the data amount managed by the remaining data management means . depending on the amount of code, and a second compression means for compressing again the compressed data at high have compression rate than the first compression rate,
An optical information recording / reproducing apparatus for recording data compressed by the second compression means so that a predetermined block unit is continuously connected on the optical information recording medium by the area management means.
( 5 ) a compression stage for compressing input signals such as audio and video at a first compression rate in predetermined block units;
A difficulty level extraction stage for extracting the level of difficulty of compression of the input signal during the compression ;
A difficulty level storage stage for storing the difficulty level;
Sequentially storing the compressed first data in a temporary storage means;
A step of writing the data stored in said temporary memory means data stored at the stage has reached a predetermined amount in the information recording medium, during a step that stores in the temporary storage hands stage, the information recording medium Reading the compressed data stored in the
In accordance with the stored difficulty value to the difficulty storing step, a second compression stage for compressing again at high have compression rate than the compressed data said first compression rate,
Storing the data compressed in the second compression step in the information recording medium .
( 6 ) a compression stage for compressing input signals such as audio and video at a first compression rate in predetermined block units;
A code amount extraction stage for extracting a code amount of data at the time of compression;
A code amount storage stage for storing the code amount;
Sequentially storing the compressed first data in a temporary storage means;
A step of writing the data stored in said temporary storage hands stage data is stored in the stage has reached a predetermined amount in the information recording medium, during a step that stores in the temporary storage unit, wherein the information recording Reading the compressed data stored on the medium ;
Depending on the amount of codes stored in said code amount storing step, and a second compression stage for compressing again at high have compression rate than the compressed data said first compression rate,
Storing the data compressed in the second compression stage in an information recording medium ;
Recording method characterized by comprising the.

  According to the present invention, at the time of recording on the optical information recording medium, the first pass data is stored in the first temporary storage means and is a period in which the optical recording medium is not temporarily written. Since the second-pass data is recompressed in the idle time, the two-pass control can be performed in one storage system substantially in real time, and the compression efficiency can be optimized. Also, during recording on the optical recording medium, the first pass data is stored at a transfer rate higher than a predetermined recording transfer rate (lower compression rate), and the second pass data is re-used in the idle time when recording / reproduction is not performed. Since compression processing is performed, two-pass control can be performed with one storage system without the user's knowledge, and compression efficiency can be optimized.

  Hereinafter, an embodiment of an optical information recording / reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a first embodiment of an optical information recording / reproducing apparatus according to the present invention, and FIG. 2 is an explanatory diagram for explaining the concept of a sector in an optical recording medium (optical disk). First, as shown in FIG. 2, the configuration of an optical disk D typified by an optical recording medium is such that a large number of tracks (not shown) are formed concentrically or spirally on the entire recording surface. As an example, two tracks TR1 and TR2 at different radii are shown. Here, since the optical disc D is rotationally controlled with a constant linear velocity (CLV), the track A on the inner circumferential side is divided into, for example, four sectors, and the track B on the outer circumferential side is, for example, It is divided into 8 sectors. The rotation period is about 40 msec when the pickup means described later is located on the inner track TR1, and about 80 msec when the pickup is located on the outer track TR2. As described above, there are a large number of tracks between the tracks TR1 and TR2 or on the inner and outer peripheral sides.

  Next, the recording / reproducing apparatus will be described with reference to FIG. In the figure, reference numeral 2 denotes a spindle motor that rotates the optical disk D, and reference numeral 3 denotes an optical pickup having a laser generating section that generates laser light for reading information and a detecting section that detects reflected light of the laser light irradiated on the optical disk D. This optical pickup unit 3 is integrally moved in the radial direction of the optical disc D by a drive mechanism (not shown). Reference numeral 4 denotes a preamplifier unit which generates a reproduction signal and a servo signal from a signal read out by the optical pickup unit 3 and a speed signal for CLV control, and includes a focus signal generation circuit. A tracking error signal generation circuit, a reproduction signal generation circuit, an equalizer circuit, a PLL circuit, a speed signal generation circuit, and the like. Reference numeral 5 denotes a light dry unit which sends a signal to be recorded to the optical pickup unit 3 during recording. Reference numeral 6 denotes a servo block unit, which includes a focus control function, a tracking control function, a spindle control function, and the like. Reference numeral 7 denotes a driver unit for operating the optical pickup unit 3 and the spindle motor 2, which performs focus control, tracking control, spindle control, and the like.

  Reference numeral 8 denotes a signal processing unit, which includes an encoder 8A and a decoder 8A. Here, for example, the decoder 8A decodes a reproduction signal from an EFM (Eight to Four Modulation) + signal into NRZI data, performs error correction processing of the decoded reproduction signal, and obtains an address signal and a data signal of the sector. This signal is a signal compressed at a variable transfer rate. Reference numeral 9 is a temporary storage means having a storage capacity of about 256 MB, for example, composed of DRAM. Here, the inside is divided into two parts, a first temporary storage part (means) 9A and a second temporary storage part (means) 9B. Use it divided into two areas. The first temporary storage unit 9A temporarily stores an input signal to be recorded in a state compressed at the first compression rate. The second temporary storage unit 9B temporarily stores the signal read from the optical disc D, thereby absorbing the time axis of the variable transfer bit rate. Reference numeral 10 is an encoder / decoder unit of A (audio) -V (video), for example, and includes an AV encoder 10A and an AV decoder 10B. The AV decoder 10B has a decoding function (during reproduction) for decompressing the compressed data, and the AV encoder 10A has an encoding function (during recording) for compressing the input signal. The AV encoder 10A has a temporary storage unit 11 made of, for example, 64 MB DRAM used for encoding, and the AV decoder 10B has a temporary storage unit 12 made of, for example, 16 MB DRAM used for decoding.

The AV encoder 10A is connected to a speaker that outputs an audio signal and a display that outputs a video signal. The AV decoder 10B is connected to a microphone that inputs an audio signal, a CCD camera that inputs a video signal, and the like. Reference numeral 11 is a storage amount monitoring means for monitoring the data storage amount stored in the first temporary storage means 9A, and reference numeral 12 extracts and stores the degree of difficulty in compressing the input signal when the input signal is compressed. It is a difficulty level extraction means (extraction storage means).

  Here, the difficulty level is image property information, and one of the image property information is, for example, dispersion of input images. In moving picture compression by MPEG, since compression is performed by combining two-dimensional DCT conversion and Huffman coding, compression efficiency is deteriorated for an image containing many components having a high spatial frequency. In such an image, the dispersion of the image amplitude is large. Even in a moving image including such a section, in order to maintain uniform image quality throughout the entire moving image, an image with a large variance is compressed so as to have a larger code amount, and an image with a small variance has a smaller code amount. It is necessary to control so as to compress. For this purpose, first, the variance of each frame is obtained throughout the entire moving image, and the average value thereof is calculated. A frame having a variance greater than the average value is assigned a code amount larger than the average code amount, and is smaller than the average value. It is necessary to assign a code amount smaller than the average code amount to a frame having variance.

  The second property information of the image property information includes a correlation between frames. In moving picture compression by MPEG, a reference area having a similar luminance distribution between adjacent frames is searched, and a spatial orientation (motion vector) of the reference area and a luminance difference (prediction difference) between the reference area are calculated. The compression efficiency is increased by compressing the efficiency of the motion vector and the prediction difference. When the inter-frame correlation is high, almost no prediction difference is generated, so that it is possible to compress the code amount to a smaller amount. When the prediction difference is large, a larger amount of code is generated. By performing code amount control reflecting the prediction difference amount, compressed information that maintains uniform image quality can be obtained.

  As the third property information of the image property information, there is a method of compressing the primary bit stream so that the image quality is constant and using the code amount as an index. In MPEG image compression, a DCT coefficient obtained as a result of DCT conversion is divided by a numerical value called a quantization coefficient, the decimal part is discarded, and the result is converted to a smaller value and compressed. As the quantization coefficient increases, the distortion due to compression increases, but it is possible to compress at a higher compression rate. By performing compression while keeping the quantization coefficient constant, compression with uniform image quality is possible. In this case, the amount of the bit stream obtained as a result of the compression depends on the nature of the input image, and an image including a large amount of components having a high spatial frequency or an image having a small inter-frame correlation is compressed to a large bit stream amount. From the code amount of each frame required in the primary compression and the total code amount, the allocated code amount of each frame for accommodating the entire code amount in the target amount is calculated, and when generating the secondary bitstream, The code amount is controlled so as to be this value. Reference numeral 13 denotes a key portion, and a command such as a recording mode is input using a key or the like. Reference numeral 14 denotes a system control unit (control means) composed of, for example, a microcomputer and controls the operation of the entire apparatus.

  Next, the operation of the recording / reproducing apparatus configured as described above will be described. First, the reproduction operation will be described. The system control unit 14 determines a playback start or recording start command input by the key unit 13 or the like, and controls the signal processing unit 8, the servo block unit 6, and the like according to this command. The signal of the optical disk D read by the optical pickup unit 3 is input to the preamplifier unit 4 where a reproduction signal, a servo signal, and the like are generated. The generated servo signal is input to the servo block unit 6, and based on this, a focus drive signal, a tracking drive signal, and the like are supplied to the actuator of the optical pickup unit 3 via the driver unit 7, and each control is performed. It is. As a result, one round of servo control of the optical pickup unit 3 is performed.

  The speed signal is obtained by a PLL (Phase Locked Loop) circuit included in the preamplifier unit 4, and this speed signal is sent to the servo block unit 6 to generate a drive control signal via the driver unit 7. CLV control is performed by controlling the rotation of the spindle motor 2 by this drive control signal. Further, a rotational position signal such as a hall element (not shown) of the spindle motor 2 is fed back to the servo block unit 6, and a constant rotation FG (Frequency Generator) control is also performed from a speed signal generated from this signal. Further, the frequency characteristics of the reproduced signal are optimized by the equalizer of the preamplifier unit 4 and the PLL is applied by a PLL (Phase Locked Loop) circuit, and the jitter value generated from the comparison between the PLL bit clock and the time axis of the data The waveform correction at the time of recording is performed according to the jitter value.

  The reproduction signal output from the preamplifier unit 4 is converted into a digital signal by the decoder 8B of the signal processing unit 8, and synchronization detection is performed from this digital signal, and based on this, the EFM + signal on the disk is used. Decoded into NRZI data. The decoded signal is subjected to error correction processing to obtain a sector address signal and a data signal. Since this data signal is a signal compressed at a variable transfer rate, for example, MPEG2, it is temporarily stored in the temporary storage means 9 (second temporary storage unit 9B) to absorb the time axis of the variable transfer rate. To do. The signal read from the temporary storage means 9 (9B) is expanded by the AV decoder 10B of the encoder / decoder unit 10 and further separated into an audio signal and a video signal. At this time, the speed of expansion corresponding to various recording modes is determined by the control data recorded on the optical disc D, and the expansion operation is performed according to this. Each signal is converted into an analog signal by a D / A converter (not shown) and output as an audio signal and a video signal.

  Next, the recording operation that characterizes the present invention will be described. FIG. 3 is a conceptual diagram showing a control state of the first temporary storage unit 9A of the temporary storage means 9 during recording. Here, the full data storage amount corresponds to the first recording reference value, and the empty corresponds to the second recording reference value. In this apparatus, when recording an input signal, a laser spot of the optical pickup unit 3 is first irradiated on the optical disc D, an address signal provided in advance in the signal track is read, and the optical pickup is recorded in a target sector to be recorded. After moving the unit 3, the transfer rate at the time of recording is set for the AV encoder 10A of the encoder / decoder unit 10 by setting the key unit 13 and the like. For example, as a recording mode, when compressing an image signal input at 10 Mbps as an input signal of an original image, a two-hour mode with a recording time of 2 hours at a high image quality transfer rate of 8 Mbps, a slightly high image quality transfer rate of 4 Mbps. There are a 4-hour mode with a recording time of 4 hours and an 8-hour mode with a recording time of 8 hours with a normal image quality transfer rate of 2 Mbps, and the mode can be selected.

  When writing to the optical disk D, the rotational speed of the optical disk D is set to the maximum transfer rate of the input signal at the time of recording, for example, a transfer rate higher than 8 Mbps, for example, 10 Mbps. The writing speed is fixed at the high transfer rate. In addition, the system control unit 14 recognizes key switching and external control data for setting the resolution of the image to be recorded, fast scenes such as car races, etc. It has a terminal, and the recording time can be changed by this, and the user inputs from the key unit 13 or the like. The change of the recording time here is performed by one-pass VBR (variable bit rate), but may be CBR (constant bit rate). With VBR, the compression ratio can be increased and the transfer rate can be lowered. However, there is a problem that the recording time cannot be made constant because of one pass, and conversely, with CBR, the transfer rate cannot be lowered so much. There is also an advantage that time can be kept constant. Among these, it is desirable to use CBR particularly when the transfer rate is high (8 Mbps or the like) and VBR when the transfer rate is low (2 Mbps or the like).

  As a recording signal source for outputting an input signal, a microphone for inputting an audio signal, a video apparatus for inputting an audio signal and a video signal, and the like are used, but are not particularly limited thereto. In the recording mode, the AV encoder 10A of the encoder / decoder unit 10 can be set for each transfer rate, and the user sets this transfer rate. The input signals to be recorded (audio signals and video signals) input from the recording signal source are encoded and compressed in, for example, MPEG using the 64 MB temporary storage unit 25 by the AV encoder 10A of the encoder / decoder unit 10. The full (first recording reference value) and empty (second recording reference value) of the first temporary storage unit 9A are set in accordance with the transfer rate corresponding to the compression, and the encoder 8A of the signal processing unit 8 is further set. And an error correction code, an address code, a sync signal, etc. are added and temporarily recorded in the first temporary storage section 9A (area a). This data is referred to as data X1. This storage data amount is constantly monitored by the storage amount monitoring means 11. When this storage data amount becomes full, data is sequentially read from the first temporary storage unit 9 A and light is transmitted via the write drive unit 5. The optical disk D is temporarily written by the pickup unit 3 (b area). Even during the reading from the first temporary storage unit 9A, the input signal from the recording signal source side is compressed and continuously written to the first temporary storage unit 9A. The reading speed is faster.

  When the amount of data stored in the first temporary storage unit 9A becomes empty, reading from the first temporary storage unit 9A and writing to the optical disc D are prohibited, and the optical pickup is performed at the sector position to be recorded next. Position part 3 and repeat the kick here to wait. During this time, the compressed data is continuously written to the first temporary storage unit 9A (area c), and this data is referred to as data X2. When the amount of stored data becomes full, reading of data from the first temporary storage unit 9A is resumed, and temporary writing to the optical disc D is performed until the amount of stored data becomes empty ( d region). Thereafter, in the same manner, the temporary data writing to the optical disk D is performed intermittently while the amount of data stored in the first temporary storage unit 9A is repeatedly full and empty. Note that data X3 is stored in the area e.

  FIG. 3A shows a case where the transfer rate of the input signal is 2 Mbps, the writing speed to the first temporary storage unit 9A in the area a is written at 2 Mbps, and the provisional speed to the optical disc D in the area b. Since the writing speed (transfer rate) is 10 Mbps, data is read from the first temporary storage unit 9A at a speed (transfer rate) of 10−2 = 8 Mbps. FIG. 3B shows a case where the transfer rate of the input signal is 4 Mbps, the writing speed to the first temporary storage unit 9A in the area a is written at 4 Mbps, and the provisional speed to the optical disc D is written in the area b. Since the writing speed (transfer rate) is 10 Mbps, data is read from the first temporary storage unit 9A at a speed (transfer rate) of 10−4 = 6 Mbps. FIG. 3C shows the case where the transfer rate of the input signal is 8 Mbps, the writing speed to the first temporary storage unit 9A in the area a is written at 8 Mbps, and the provisional speed to the optical disc D is written in the area b. Since the writing speed (transfer rate) is 10 Mbps, data is read from the first temporary storage unit 9A at a speed (transfer rate) of 10−8 = 2 Mbps.

  In the above three cases, the transfer rate of the input signal to the temporary storage unit 9A is set to be as low as 2, 4, 8 Mbps with respect to 10 Mbps which is the transfer rate at the time of recording on the optical disc D. During the standby state until the start of writing to the optical disk D in the areas c and e, the input signal can be continuously recorded in the temporary storage unit 9A. The above description is about one-path variable transfer rate (VBR). In other words, regardless of the nature of the signal of the input signal, for example, the average transfer rate is controlled so as to be 2 Mbps, so in sports videos with a lot of movement and videos with a lot of scene changes, a failure occurs, Even so, if a large bit rate is assigned to a scene with a lot of movement by VBR, the overall transfer rate increases, and a large capacity is required as a recording area, making it impossible to efficiently manage the recording time of the entire optical disc. Also occurs. This is particularly likely to occur when a high compression rate is set for the input signal. For example, when the transfer rate is set to 8 Mbps in the above example (video with a lot of movement or video with a lot of scene changes), the compression rate is small, so it is unlikely that the video signal will fail. Even one-pass VBR recording is sufficiently satisfactory depending on the image quality, and in some cases, CBR (constant bit rate) may be used instead of VBR. On the other hand, when 2 Mbps is set, since the compression rate is large, the possibility of failure is increased because the compression is particularly forced.

  Therefore, in this embodiment, two-pass control, which is a feature of the present invention, is performed in order to prevent the above-mentioned failure. As described above, 2 Mbps has a larger problem of the video signal failure in 1-pass VBR. Therefore, as can be seen from the description of the control of the first temporary storage unit 9A, the first time during recording is Since there are free periods that are recorded in the temporary storage unit 9A and are not recorded in the optical disc D, for example, periods a, c, and e in FIG. 3, two-pass control is performed using these periods. do. In the two-pass control, data temporarily recorded on the optical disk D in the state shown in FIG. 3 is read, the read signal is recompressed, and written to the optical disk D again. FIG. 4 is a graph showing changes in the data storage amount of the first temporary storage unit 9A and the second temporary storage unit 9B, and FIG. 5 is a diagram schematically showing recording tracks on the optical disc D. FIG. 3 is a diagram schematically showing an arrangement of recording data on an optical disc. Here, FIG. 4A shows changes in the data storage amount of the first temporary storage unit 9A corresponding to the graphs of FIGS. 3A, 3B, and 3C, and FIG. B) shows a change in the data storage amount of the second temporary storage unit 9B. In FIG. 4A, timing and the like are shown as an example of FIG. 3A. 5A and 6A show the recording scanning state on the track of the optical disk in the first pass (temporary writing), and FIGS. 5B, 5C and 6B show 2. The recording state on the track of the optical disc during the pass (main writing) is shown.

  First, when the system control unit 14 sets, for example, a 2 Mbps mode in the multi-recording mode by input data from the key unit 13 or the like, this mode is set in the AV encoder 10A. In this state, when a video signal or the like (input signal) to be recorded is input to the AV encoder 10A, the AV encoder 10A performs difficulty level extraction in order to perform MPEG2 compression processing on the single video signal. The means 12 analyzes the image information property of the video signal to obtain the difficulty level. Here, an example of the analysis method of the image information property is also shown in the above-mentioned Japanese Patent Application Laid-Open No. 10-98710. For example, in the moving image compression by MPEG, the correlation between frames is calculated between the adjacent frames. Search for a reference area having a similar luminance distribution, calculate a spatial orientation (motion vector) of the reference area and a luminance difference (prediction difference) between the reference area, and compress the motion vector and the prediction difference with high efficiency. There is something that was made. Then, the compressed data of one GOP (group of picture) unit in the MPEG system is temporarily stored at 64 MB on the quantization scale corresponding to the analysis result (degree of difficulty) and the transfer rate of 8 Mbps which is larger than the above 2 Mbps. It is generated using the storage unit 25. The image information property of this compressed data is stored in the AV encoder 10A, for example. Here, for example, as shown in the above-mentioned Japanese Patent Laid-Open No. 10-98710, based on MPEG, compressed data (consisting of I picture, P picture, and B picture frames) forming one GOP is generated. To do. Then, the AV encoder 10A transfers the compressed data to the second temporary storage unit 9B via the encoder 8A of the signal processing unit 8 in units of 1 GOP or more (hereinafter referred to as one block).

  In this setting, the 2-pass control is performed at a transfer rate of 2 Mbps. However, the control of the 1-pass and 2-pass is appropriately controlled by the free area of the optical disc D, user settings, automatic detection, and the like. It may be changed. Two-pass control will be described with reference to FIG. The encoder 8A of the signal processing unit 8 temporarily stores the data compressed by the AV encoder 10A in the second temporary storage unit 9B. Then, in order to record (temporarily write) the compressed data stored here, the data is converted into an EFM + format, an error correction code is added, a sync is added, and the like, and the optical disc D is converted into sector unit data. To record. This point is as described above. The first temporary storage unit 9A records data X1 from timing T1 (empty) to T2 (full), and at a timing from T2 (full) to T3 (empty), a predetermined track at point A on the optical disc D is recorded. The data X1 read from the first temporary storage unit 9A is temporarily written from the predetermined sector to point B. Next, until the data X2 is accumulated in the first temporary storage unit 9A (T3 to T4), the optical pickup unit 3 waits in the kick state at point B to be recorded next, and repeats the kick operation. When the data X2 accumulates in the first temporary storage unit 9A (when T4 (full) is reached), the data X2 is temporarily written from the point B to the point C of the optical disc D from the timing T4 to T5 (empty). When the data X3 accumulates in the same manner at T10, the data X3 is temporarily written from the point C to the point D of the optical disc D from timing T10 to T11. Thereafter, the same operation is performed. Accordingly, as shown in FIG. 5A, data is temporarily recorded on the spiral track as points A, B, C, and D.

  Here, as described above, the result of analyzing the degree of compression difficulty from the image information property corresponding to the compressed data X1 to X3 of each block is calculated as the number of blocks obtained by adding the results of each block and the addition average value. To do. Then, when the value of the result reaches the predetermined block amount, the temporary storage operation of the second temporary storage unit 9B is started. The control of the second temporary storage unit 9B is performed from time T5 when the temporary recording of the data X2 on the optical disc D is completed in FIG. 4B. At this time, the optical pickup unit 3 is in a state where the head kick is repeated on the track at the point C and reaches a predetermined block value (in practice, this temporary writing time is used for a long time). The quantization scale for achieving a transfer rate of 2 Mbps to be originally recorded is determined from the difficulty level of the time. Based on this value, in order to reproduce the data X1 temporarily recorded on the optical disc D at 8 Mbps simply (temporarily) as described above, the optical pickup unit 3 is moved from point C to point A at timing T6. Moving. Then, the signal is reproduced and read from the sector at the point A to the sector at the point B (timing T7), and this read signal is temporarily recorded in the second temporary storage unit 9B via the preamplifier unit 4 and the decoder 8B. Since this read signal data is 8 Mbps data, it is recompressed as in the following three methods in order to convert it again to 2 Mbps.

<First Method> For example, in the path indicated by [circle 1] in FIG. 1, as described above, 8 Mbps data X1 accumulated in the second temporary storage unit 9B is transferred to the decoder 8B and the AV encoder 10A. In this AV encoder 10A, the quantization scale is rewritten and recompressed.
<Second Method> In the path indicated by [circle 2] in FIG. 1, the data X1 is transferred to the AV decoder 10B, and only a part of the data X1 is decoded by the AV decoder 10B. Is transferred to the AV encoder 10A, and the quantization scale is rewritten and recompressed by the AV encoder 10A.
<Third Method> In the path indicated by [circle 3] in FIG. 1, the data X1 is transferred to the AV decoder 10B, and all the data of the data X1 is decoded by the decoder 10B. The AV encoder 10A rewrites and recompresses the quantization scale.
As a result, the data X1 compressed to 2 Mbps can be stored in the second temporary storage unit 9B by the encoder 8A. During this time, the optical pickup unit 3 is moved to the point A to be recorded next. Overwrite recording, that is, main writing is performed on the recorded 8 Mbps data. Here, since the data X1 is converted into data of 2 Mbps, the end position is moved from the point B to the point B ′ as shown in the spiral (see FIG. 5B). Next, when the first temporary storage unit 9A reaches a predetermined amount (full) (timing T10), the optical pickup unit 3 moves to point C and temporarily writes the data X3 on the optical disc D. Hereinafter, by repeating this operation, it is possible to record the 2-pass VBR.

  In the second time of the second temporary storage unit 9B, the data X2 from the point B to the point C on the disc is recorded while sequentially changing the position so as to be recorded from the point B 'to the point C'. For this reason, the current recording address management and the two-pass address management must be performed simultaneously. In this way, when using an optical disc for the first time, whether it is 0 address or an intermediate address, while managing two addresses, for example, data continuously from A address, By recording intermittently while performing linking, and preferably by overwriting and recording the data of the first pass and the second pass, the data area of the optical disk can be recorded effectively, and Therefore, the movement time between tracks can be shortened, and efficient two-pass recording can be performed.

  The recording state on the track of the optical disc at this time is recompressed and recorded when the 1-pass data a, b, c... Is 2-pass data as shown in FIGS. In summary, the data X1 is read from the optical disc D1 between timings T6 and T7, the read signal is recompressed between timings T7 and T8, and the data is temporarily stored in the second temporary storage unit 9B. Further, the data X1 is read from the second temporary storage unit 9B between the timings T8 and T9 and is written on the optical disc D. Note that the above-described series of processing is performed between timings T5 and T10. Similarly, the data X2 is read from the optical disc D1 between timings T12 and T13, the read signal is recompressed between timings T13 and T14, and this data is temporarily stored in the second temporary storage unit 9B. Further, the data X2 is read from the second temporary storage unit 9B between the timings T14 and T15, and is written on the optical disc D. At this time, the recompressed data recorded on the optical disc D is recorded continuously. It should be noted that this series of processing is performed between timings T11 and T16. Thereafter, the same processing is repeatedly performed.

  It should be noted that between the timings T7 and T8 and between T13 and T14, the case where the data is transferred from the second temporary storage unit 9B and the case where the recompressed data are stored are interlaced. The storage data amount is described in a mixed manner. In this case, the compression processing may be performed by using the temporary storage units 11 and 12 of the encoder / decoder unit 10 for division processing. Here, the series of operations described above will be described generally with reference to the flowchart shown in FIG. First, the external signal is compressed at the first compression rate, and this compressed data is stored in the first temporary storage unit 9A (S1). At the time of this compression, the difficulty level extraction means 12 integrates the property data of the recording block. Then, the degree of difficulty of compression is obtained (S2).

Then, the recording blocks at this time are integrated (S3), and when the integrated value is not a predetermined amount, the process proceeds to S7 and it is determined whether or not the first temporary storage unit 9A is full (S7). ). And when it is not full, it returns to S1 and repeats said S1-S4. If full in S7, the data in the first temporary storage unit 9A is temporarily recorded on the optical disc D (S8). This temporary recording operation is continued until empty (S9). If there is data to be recorded, the process returns to S1 again. Further, in S4, if the recording block becomes a predetermined amount, go to a predetermined area of the optical disc, reads the data of the tentative recorded previously, stores it in the second temporary storage section 9B (S 5) . Then, the data in the second temporary storage unit 9B is recompressed at the second compression rate, and this recompressed data is recorded in the recompressed data area of the optical disc D so as to be continuous with the previous recompressed data ( S 6). In this way, the series of operations S1 to S10 are repeated, and if there is no more data to be recorded in S10, the process is terminated.

  In the first embodiment, the data of one block is recompressed using the second temporary storage unit 9B while the data of one block is being compressed and stored in the first temporary storage unit 9A. However, at this time, data of a plurality of blocks may be recompressed. FIG. 8 shows a change in the data storage amount of the first temporary storage unit and the second temporary storage unit in the case of this modification. Here, for example, one data block, that is, data X4 is stored in the first temporary storage unit. While the data is stored in the unit 9A, the two data blocks temporarily written, that is, the data X1 and X2 of the AB section and the BC section on the optical disk D are read from the optical disk D1 to obtain the second temporary block. The data is stored in the storage unit 9B, and each of them is recompressed and written to the optical disc D1. In FIG. 8, the temporary writing portion of the data X4 is shown enlarged in time.

  Thus, for example, when compressing data of one block, by recompressing two blocks, for example, when compressing 100 data, 50 data is temporarily recorded, and By determining the recompression rate at the stage of extracting the properties and starting the recompression, the effect close to the two-pass control can be obtained, and the compression and recompression are almost simultaneously performed with the temporary recording time of the remaining 50 data. Since it ends, 2-pass control can be realized in real time. Here, it has been described that two blocks are recompressed when compressing one block. However, by using three or more blocks, it becomes closer to a two-pass technique, and compression efficiency can be increased. This also increases the disk usage efficiency.

  Further, the timing for performing the recompression has been described in the case where the start timing is the time when predetermined data is accumulated. However, for example, a timer means is provided, and the time when a predetermined time has elapsed may be set as the start time. Management means for managing the free area may be provided, and the start point may be determined according to the free area of the disk. In other words, in the 2-pass control, the data area of the first pass temporary recording requires more data area on the disc than the final 2-pass main recording data area. When there is little space, this problem can be solved by starting the two-pass control earlier than a predetermined amount. In this method, since the data once compressed is recompressed, the time from the temporary compression to the end of the total recording may be slightly extended, but this can be minimized. Further, the recording means of the first temporary storage unit 9A, the second temporary storage unit 9B, and the temporary storage unit 25 may be divided into one recording unit.

  Next, a second embodiment of the present invention will be described. In the first embodiment, when the input signal is stored in the first temporary storage unit 9A, the free time of the optical pickup unit in which the stored contents are not recorded on the optical disc D is used. Although the path control is performed, in the second embodiment, the two-path control is performed by using a free time during which recording or reproduction is not performed, for example, a break time or a night time, at a low transfer rate such as 2 Mbps. Is. FIG. 9 is a block diagram showing a second embodiment of the apparatus of the present invention, FIG. 10 is a graph showing changes in data recording amounts of the first temporary storage unit and the second temporary storage unit, and FIG. 11 is management on the optical disc. It is a figure which shows area | region data. As shown in FIG. 9, the apparatus of the second embodiment is different from the apparatus of the first embodiment shown in FIG. 1 in that the compression rate determining means 20 for determining the data compression rate and the recording / reproducing with respect to the optical disc D are predetermined. Except for the point that the timer means 21 for detecting that it is not performed is added, it is configured in exactly the same way as the apparatus shown in FIG.

  In the first embodiment, as shown in FIG. 3, the operation of compressing the input signal and temporarily storing it in the first temporary storage unit 9A and further reading and temporarily writing it to the optical disc D is intermittent. Since the operations performed in the second embodiment are performed in the same manner in the second embodiment, the description thereof is omitted here. In the above compression operation, compression is performed at a first compression rate lower than the compression rate determined by the compression rate determination means 20. In addition to the above operation, in the second embodiment, when the data is compressed by the AV encoder 10A, the difficulty level extraction means 12 analyzes and extracts the compression difficulty level from the image information properties, and this recording is also performed. Information corresponding to the address and data is generated along with the above-mentioned difficulty level, and management area data is generated and stored as shown in FIG. The management information finally recorded at 2 Mbps is also stored in the same manner.

  Here, the control operation of the second temporary storage unit 9B is at the stage when a series of temporary writing (temporary recording) to the optical disc D is completed, and the next recording / reproducing command is not input for a predetermined time. It is started on the condition. The timer means 21 determines that this command is not input for a predetermined time. This processing can be set not only by time management by a timer but also by, for example, determination of the non-selected state of the apparatus by external input, or by an absolute time, for example, from 3 to 5 in the night. In the graph shown in FIG. 10, when the timer means 21 determines that the timer start is set and the recording / playback command is not input within a predetermined time from the time T5 when the temporary recording of the data X2 on the optical disk is completed, The control operation of the second temporary storage unit 9B is performed. At this time, the optical pickup unit 3 is repeatedly stopped at the track at the point C, and if the timer means 21 measures a predetermined time, the transfer rate of 2 Mbps to be originally recorded is determined from the difficulty at this time. A quantization scale is determined for the purpose. Based on this value, the optical pickup unit 3 is moved from point C to point A at timing T6 in order to reproduce the data X1 recorded at 8 Mbps simply (temporarily) as described above. Then, the signal is reproduced and read from the sector at the point A to the sector at the point B (timing T7), and this read signal is temporarily recorded in the second temporary storage unit 9B. Since this read signal data is 8 Mbps data, it is recompressed in order to convert it again into 2 Mbps. The recompression path at this time is performed in the same manner as described for the paths of [Circle 1], [Circle 2], and [Circle 3] in FIG.

  As a result, as in the case of the first embodiment, the data X1 compressed to 2 Mbps can be stored in the second temporary storage unit 9B by the encoder 8A. During this time, the optical pickup unit 3 is recorded next. Move to the power point A, and overwrite recording, that is, main writing, is performed on previously recorded 8 Mbps data. Here, since the data X1 is converted into data of 2 Mbps, the end position is moved from the point B to the point B ′ so as to be in a spiral (see FIG. 10B). Next, at timing T12, the optical pickup unit 3 goes to the B point of the disc and reads the temporarily recorded data X2 up to the C point. Then, this data is recompressed and recorded at the B'-C 'point between the timings T14 and T15. Hereinafter, by repeating this operation, it is possible to record the 2-pass VBR.

  In the second time of the second temporary storage unit 9B, the data X2 from the point B to the point C on the disc is recorded while sequentially changing the position so as to be recorded from the point B 'to the point C'. For this reason, the current recording address management and the two-pass address management must be performed simultaneously. In this way, when using an optical disc for the first time, whether it is 0 address or an intermediate address, while managing two addresses, for example, data continuously from A address, By recording intermittently, and preferably by overwriting and recording the data of the first pass and the second pass, the data area of the optical disc can be recorded effectively, and between the tracks The traveling time is short and efficient two-pass printing can be performed.

  Here, the above series of operations will be described in general with reference to the flowchart shown in FIG. First, when an external signal to be recorded is input, it is compressed and temporarily stored in the first temporary storage unit 9A (S21). At this time, the property data of the recording blocks are integrated to extract the difficulty level. Then, the compression rate is determined (S22). Steps S21 and S22 are performed until the storage amount of the first temporary storage unit 9A becomes full (S23). When the storage amount becomes full, the data in the first temporary storage unit 9A is read and temporarily recorded on the optical disc D. (Tentative writing) is performed (S24). This temporary recording is performed until the first temporary storage unit 9A becomes empty (S25). If the first temporary storage unit 9A becomes empty, it is determined whether or not the recording is completed (S26). If not, the process returns to S1.

  If the recording is finished, the timer means 21 is started to start measuring time (S27), and it is determined whether or not a recording / reproducing command is input (S28). If the recording / reproducing command is input, the timer means 21 is reset (S29), and the process returns to S1. If a predetermined time has passed without the recording / reproducing command being input (S30), the data temporarily recorded from the optical disk D is read out and this read signal is temporarily stored in the second temporary storage unit 9B. (S31). Then, the read data is recompressed based on the difficulty level and temporarily stored in the second temporary storage unit 9B (S32). Further, the recompressed data is read out and written onto the optical disc D for recording (S33). This recompression process (S30 to S33) is performed until all the temporarily recorded data is read (S34). If all the temporarily recorded data is read, the process is terminated.

  In the second embodiment, the first temporary storage unit 9A and the second temporary storage unit 9B are separated in order to facilitate the understanding of the invention. However, both storage units 9A, 9B are described. May also be used as the same memory. Further, in the first and second embodiments, the first and second temporary storage units 9A and 9B have been described by dividing the temporary storage unit 9 made of 256 MB DRAM, but the memory of one DRAM or the like is divided. It is not limited to the case where they are used, but they may be used together, or two or more memories may be allocated and used in a shared manner. Further, the recording means of the first temporary storage means 9A, the second temporary storage means 9B, and the temporary storage means 25 may be used by dividing one recording means. In the above embodiment, the processing on one data surface has been described. However, provisional data and main data may be recorded / reproduced using a plurality of signal surfaces of a multi-layer disc.

1 is a block diagram showing a first embodiment of an optical information recording / reproducing apparatus of the present invention. It is explanatory drawing for demonstrating the concept of the sector in an optical recording medium (optical disk). It is a conceptual diagram which shows the state of control of 9 A of 1st temporary storage parts of the temporary storage means at the time of recording. It is a graph which shows the change of the data storage amount of the 1st temporary storage part and the 2nd temporary storage part. It is a figure which shows typically the recording track on an optical disk. It is a figure which shows typically the arrangement | sequence of the recording data on an optical disk. It is a flowchart which shows operation | movement of 1st Example of this invention apparatus. It is a figure which shows the change of the data storage amount of the 1st temporary storage part of the modification of 1st Example of this invention apparatus, and a 2nd temporary storage part. It is a block block diagram which shows 2nd Example of this invention apparatus. It is a graph which shows the change of the data recording amount of the 1st temporary storage part and the 2nd temporary storage part. It is a figure which shows the management area data on an optical disk. It is a flowchart which shows operation | movement of 2nd Example of this invention apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 ... Optical pick-up part, 4 ... Preamplifier part, 5 ... Write drive part, 6 ... Servo block part, 8 ... Signal processing part, 8A ... Encoder, 8B ... Decoder, 9 ... Temporary storage means, 9A ... 1st temporary storage Part (first temporary storage means), 9B ... second temporary storage part (second temporary storage means), 10 ... encoder / decoder part, 10A ... AV encoder, 10B ... AV decoder, 11 ... storage amount monitoring means , 12 ... Difficulty level extraction means (extraction storage means), 14 ... System control section (control means), 20 ... Compression rate determination means, 21 ... Timer means, D ... Optical disc (optical information recording medium).

Claims (6)

Compression means for compressing input signals such as audio and video at a first compression rate in predetermined block units;
Difficulty extraction means for extracting the compression difficulty of the input signal at the time of compression ;
Difficulty level storage means for storing the difficulty level;
Hand throwing the compressed first data sequentially into the temporary storage means;
Means for managing the area of the information recording medium ;
Means for writing data stored in a predetermined area of the information recording medium when the data stored in the temporary storage means reaches a predetermined amount;
During the step of storing in the temporary storage means, the compressed data stored in the information recording medium is read out, and the compressed data is read out according to the difficulty level value stored in the difficulty level storage means. and a second compressing means for compressing again at high have compression rate than the compression rate,
A recording apparatus for recording data compressed by the second compression means in a storage area of the information recording medium . Compression means for compressing input signals such as audio and video at a first compression rate in predetermined block units;
Code amount extraction means for extracting the code amount of data at the time of compression;
Code amount storage means for storing the code amount;
Means for sequentially storing the compressed first data in a temporary storage hand throw;
Means for managing the area of the information recording medium ;
Means for writing data stored in a predetermined area of the information recording medium when the data stored in the temporary storage means reaches a predetermined amount;
During the step of storing in the temporary storage means, the compressed data stored in the information recording medium is read out, and the compressed data is read out according to the code amount stored in the code amount storage means. and a second compressing means for compressing again at high have compression rate than,
A recording apparatus for recording data compressed by the second compression means in a storage area of the information recording medium . An optical information recording / reproducing apparatus for recording / reproducing a digital signal on an optically recordable optical information recording medium,
Laser generating means for optically recording and reproducing information from a track;
Pick-up means for detecting the reflected light with a plurality of divided sensors;
Means for calculating each signal to obtain a reproduction signal and a servo error signal;
Focus control means for focusing on the signal surface;
Tracking control means for tracking the track;
Compression means for compressing the recording signal in a predetermined block unit at a first compression rate;
Difficulty extraction means for extracting the compression difficulty of the input signal at the time of compression ;
Difficulty level storage means for storing the difficulty level;
Temporary storage means for temporarily storing the compressed recording signal;
Data remaining amount management means for managing the amount of data stored in the temporary storage means;
Recording means for controlling to record the compressed recording signal on the optical information recording medium;
Area management means for managing areas recorded in the optical information recording medium;
The compressed data stored in the optical information recording medium is read out and stored in the difficulty level storage means during the stage of storing in the temporary storage means based on the data amount managed by the remaining data management means . depending on the difficulty value, and a second compression means for compressing again the compressed data at high have compression rate than the first compression rate,
An optical information recording / reproducing apparatus for recording data compressed by the second compression means so that a predetermined block unit is continuously connected on the optical information recording medium by the area management means. An optical information recording / reproducing apparatus for recording / reproducing a digital signal on an optically recordable optical information recording medium,
A laser generator hand stages for recording and reproducing information from an optically track,
Pick-up means for detecting the reflected light with a plurality of divided sensors;
Means for calculating each signal to obtain a reproduction signal and a servo error signal;
Focus control means for focusing on the signal surface;
And tracking control means to track in the track,
Compression means for compressing the recording signal in a predetermined block unit at a first compression rate;
Code amount extraction means for extracting the code amount of data at the time of compression;
Code amount storage means for storing the code amount;
Temporary storage means for temporarily storing the compressed recording signal;
And remaining data amount management means for managing the amount of data stored in the temporary storage Hand stage,
The compressed recording signal and recording means to control so as to record on the optical information recording medium,
Area management means for managing areas recorded in the optical information recording medium;
The compressed data stored in the optical information recording medium is read out and stored in the code amount storage means during the stage of storing in the temporary storage means based on the data amount managed by the remaining data management means . depending on the amount of code, and a second compression means for compressing again the compressed data at high have compression rate than the first compression rate,
An optical information recording / reproducing apparatus for recording data compressed by the second compression means so that a predetermined block unit is continuously connected on the optical information recording medium by the area management means. A compression stage for compressing input signals such as audio and video at a first compression rate in predetermined block units;
A difficulty level extraction stage for extracting the level of difficulty of compression of the input signal during the compression ;
A difficulty level storage stage for storing the difficulty level;
Sequentially storing the compressed first data in a temporary storage means;
A step of writing the data stored in said temporary memory means data stored at the stage has reached a predetermined amount in the information recording medium, during a step that stores in the temporary storage hands stage, the information recording medium Reading the compressed data stored in the
In accordance with the stored difficulty value to the difficulty storing step, a second compression stage for compressing again at high have compression rate than the compressed data said first compression rate,
Storing the data compressed in the second compression step in the information recording medium . A compression stage for compressing input signals such as audio and video at a first compression rate in predetermined block units;
A code amount extraction stage for extracting a code amount of data at the time of compression;
A code amount storage stage for storing the code amount;
Sequentially storing the compressed first data in a temporary storage means;
A step of writing the data stored in said temporary storage hands stage data is stored in the stage has reached a predetermined amount in the information recording medium, during a step that stores in the temporary storage unit, wherein the information recording Reading the compressed data stored on the medium ;
Depending on the amount of codes stored in said code amount storing step, and a second compression stage for compressing again at high have compression rate than the compressed data said first compression rate,
Storing the data compressed in the second compression stage in an information recording medium ;
A recording method comprising:

Images