JP3530546B2 - Recording / playback device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording and reproducing video information and audio information, and in particular,
It is suitable for use in a recording / reproducing apparatus that performs retrieval and reproduction of the above-mentioned video information and audio information.

[0002]

2. Description of the Related Art Conventionally, when recording / reproducing a moving image signal, a so-called VTR (video tape recorder), which uses a magnetic tape having a tape width of 1/2 inch or 8 mm, is generally used as a recording medium. Met.

The VTR records / reproduces video information of one field on one track on a magnetic tape wound on a rotary drum by a rotary head provided on the rotary drum. When performing a video search, that is, a so-called cue, with such a VTR, the recorded video information is recorded by using functions such as fast-forwarding using a cueing index signal of a video scene, rewinding control, and special playback. I try to search while actually playing.

[0004]

However, when the conventional VTR is used for searching, since the video signal is recorded on the tape-shaped recording medium, it takes time to transfer the tape to search for the target video. It was necessary, and searching sometimes required a great deal of time and effort.

Further, during the search operation, the rotary head always traces the magnetic tape on which information is recorded while hitting it, so that the reliability or reliability of the recorded information is affected by wear or damage of the magnetic tape. was there.

Further, in the case where the VTR is of a recording system using an analog signal, there is a problem that when the retrieved information is copied (copied) to another medium, image quality deterioration due to so-called dubbing occurs.

The present invention has been made to solve the above problems, and provides a recording / reproducing apparatus capable of easily and efficiently retrieving information and preventing deterioration of reliability of reproduced data. The purpose is to get.

[0008]

A recording / reproducing apparatus of the present invention is a recording / reproducing apparatus for recording / reproducing variable-length-coded moving image data in a storage medium, wherein the moving image data is recorded at regular intervals. ID generating means for generating ID data composed of address data indicating a storage address on a storage medium and ID number data for each fixed period, and ID composed of a plurality of the ID data generated by the ID generating means.
Recording means for recording a data file in a predetermined storage area of the storage medium and recording the moving image data in an area different from the predetermined storage area of the storage medium, and for starting and stopping recording of the moving image data. ID file generating means for generating a search ID file indicating the corresponding ID number data, reproducing means for reproducing the moving image data and the ID data file from the storage medium, and the I.
The moving image data by the reproducing means based on the ID number data shown in the search ID file generated by the D file generating means and the ID number data and the address data in the ID data file reproduced by the reproducing means. And a control means for controlling the search operation of.

[0009]

According to the present invention configured as described above, when recording moving picture data which has been encoded in variable length, an ID consisting of address data and ID number data of the moving picture data is recorded.
Data is generated at regular intervals, and moving image data and a plurality of I
An ID data file composed of D data is recorded in different areas of a storage medium, and when reproducing moving image data, the reproducing operation of moving image data is controlled based on the ID data file. As described above, it is possible to easily search for information without performing, for example, fast-forwarding or rewinding of a tape-shaped recording medium.

[0010]

1 is a block diagram showing an embodiment of a recording / reproducing apparatus of the present invention. In FIG. 1, reference numerals 1 and 2 denote input terminals for left (L) channel and right (R) channel audio signals (audio signals), 3 denotes input terminals for video signals (video signals), and 4 and 5 respectively denote left channels. And an AD converter 6 for converting the audio signal of the right channel into a digital signal, and 6 is an AD converter for converting the video signal into a digital signal.

Reference numerals 7 and 8 denote audio signal processing circuits for performing predetermined processing on the left channel and right channel digital audio signals respectively. Reference numeral 9 denotes a video signal processing circuit for performing predetermined processing on the digital video signals. 10 is an audio signal processing circuit. An audio data compression circuit for compressing the left channel and right channel audio data processed by 7 and 8, and a video data compression circuit 11 for compressing the video data processed by the video signal processing circuit 9.

Next, 12 is search information (ID) for data search based on time code, memory information, etc. described later.
An ID generating circuit for creating data), and 13 for an ID based on the compressed audio data, the compressed video data and the ID data.
A data synthesis circuit that creates a data block for each data,
Reference numeral 18 denotes a main memory as a recording medium for recording data blocks, which is composed of a solid-state storage element.

Next, 17 is a memory controller for controlling reading / writing of the main memory 18, 16 is a system controller for controlling the memory controller 17 and the entire device, and 14 is a year / month / day / hour / minute / second. A calendar clock generation circuit for generating the time code of 15; a memory information generation circuit for generating memory information indicating the amount of information stored in the main memory 18; 19 an operation key operated by a user; It is a display device that displays necessary information such as the operation mode of the device.

Next, 21 is a data distribution circuit for distributing the data block read from the main memory 18 to ID data, video data and audio data, and 22 is a retrieval information reproduction circuit for reproducing ID data from the distributed data. , 23 is a display information generating circuit for generating display information from ID data, 24 is a video data expanding circuit for expanding the distributed compressed video data, and 25 is audio data expanding for expanding the distributed compressed audio data. circuit,
Reference numeral 26 is a data selection circuit for synchronously selecting the expanded video data and audio data.

Next, 27 is an adder for adding the display information generated by the display information generating circuit 23 and the video data selected by the data selecting circuit 26, 28 is a DA converter for converting the added output into an analog signal, Reference numeral 30 is a video monitor for monitoring the video signal, 29 is a DA converter for converting the audio data selected by the data selection circuit 26 into an analog signal, 31 is an audio monitor for monitoring the audio signal, 3
Reference numeral 2 is an output terminal for video data, and 33 is an output terminal for audio data.

Next, the operation of the recording / reproducing apparatus having the configuration of FIG. 1 will be described separately for recording and reproducing.

First, the recording operation will be described. Left (L) channel and right (R) channel stereo audio signals are input from audio signal input terminals 1 and 2, respectively.
It is converted into a digital audio signal by the D converters 4 and 5. These digital audio signals are subjected to various noise removal processing and dynamic range restriction processing in the audio signal processing circuits 7 and 8, respectively, and then subjected to data compression processing in the audio data compression circuit 10.

This data compression processing is performed by, for example, MPEG.
Adaptive transform coding (ATAC, ASPEC) proposed by (Moving Picture Expert Group), band division coding (MUSICAM, SB / ADPCM), or the like may be used, and left / right using L / R correlation It is also possible to use vector coding of two channels mixed.

On the other hand, the video signal input from the video signal input terminal 3 is converted into a digital video signal by the AD converter 6 capable of processing at a higher speed than the AD converters 4 and 5. This digital video signal is subjected to signal processing of components described later in the video signal processing circuit 9 as needed, and then the data amount thereof is reduced to about several tens to several hundreds in the video data compression circuit 11. Compressed.

This data compression processing includes interframe correlation processing using image correlation between frames, motion vector compensation for reducing image quality deterioration in this processing, and further, this is performed for frames before and after the time axis (past and future). It can be realized by appropriately combining the both-side prediction interframe compression and the like. As an example, a so-called 1/2 inch VTR standard image quality level can be secured by the so-called MPEG-I algorithm proposed by MPEG.

When the data compression process is completed, I will be described later.
The ID data output from the D generation circuit 12 and the compressed audio data and video data are combined in a data combining circuit 13 to form a data block that serves as a predetermined storage unit. Store in memory 18. The main memory 18 is a large-capacity solid-state memory circuit including a flash memory, a DRAM, an SRAM, etc., and the memory controller 17 controls the memory address and writing / reading. Further, the system controller 16 controls the memory controller 17.

In addition to the control of the memory controller 17, the system controller 16 controls the recording / reproducing / searching operation as a whole of the apparatus. That is, the system controller 16 controls the memory controller 17 in response to an instruction such as recording / playback / search input by operating the operation keys 19, and at the same time indicates the operating status and the recording / playback time. Information such as a time code is displayed on the display device 20, and
Information such as a time code is also notified to the memory information generation circuit 15.

There are two main types of this time code. The first is information indicating the elapsed time from the beginning of the main memory 18 or the video program and the cumulative time of camera shooting, and the second is the date and time information at the time of recording or camera shooting. A calendar clock generation circuit 14 is provided for the latter time code generation.

The memory information generation circuit 15 receives data such as the information storage status of the main memory 18 from the memory controller 17, and as the memory information indicating the data amount of the recorded information of the main memory 18, the ID generation circuit 12
Supply to. As the contents of this memory information, for example,
The time code based on the information from the system controller 16 and the data indicating the mode selection of the image quality and the sound quality, and the data amount of the video and audio based on the information from the memory controller 17 (the data length in the case of the variable length coding). ,
And the start address value of data storage on the memory.

The ID generating circuit 12 uses the memory information and the information from the system controller 16 to generate an ID.
Data is created and this ID data is supplied to the data synthesis circuit 13. The data synthesizing circuit 13 puts together the ID data and the compressed audio data and video data to form a data block as a predetermined storage unit. Then, the data block for each ID data is sequentially stored in the main memory 18. Also, the main memory 18
The head address of each data block stored in the main memory 18 is sequentially written into the set ID file in the main memory 18.

FIG. 2 shows an example of data storage in the main memory 18 and a data format of a data block.

In FIG. 2A, the horizontal axis is the time axis, and
It shows that an ID number is generated at every predetermined interval T ₀ . 2B to 2D are conceptual diagrams of the address space of the main memory 18. As shown in FIG. 2 (d), since the video data and audio data after the ID data is obtained by variable-length coding is sequentially stored in every predetermined processing period, generation interval T ₀ of the ID numbers It becomes a constant interval (for example, 1 second).

Here, in order to enable quick access to the data blocks when searching for video data and audio data, the storage locations of the data blocks sequentially stored are shown as shown in FIG. 2C. An ID file as shown in FIG. 2B, which is a collection of addresses, is generated in advance. This ID file is stored in the main memory 18
In this area, only the head address of each data block is stored in an area preset according to the storage capacity.

The ID data in the data block has a fixed length, and in the example of FIG. 2, it has a total of eight types of basic information and ID as shown in (d). That is, as reference information, SMPTE (Society of Motion Picture)
and Television Engineers), time code, data for selecting the image quality or sound quality mode by trade-off with recording time, start address and data amount of variable length AV data (audio data and video data), and deleted flag 8
Have a kind. The deleted flag is a logical erased state that can be restored before the physical delete process when the recorded data is erased, and prohibits normal reproduction by this flag.

The audio data in the data block is composed of compressed audio data which has been subjected to the compression processing for each of the left and right channels. The video data is composed of compressed video data encoded by various compression methods. Although not shown, the audio data may include initialization information (audio reset data) for each of the left and right channels.
The video data may include an initialization screen (video reset data) by, for example, intra-frame coding.

Then, for each ID data, the video data and the audio data having the above-mentioned configuration are integrated to form a data block. This data block is characterized in that it is generated at regular intervals T ₀ defined on the time axis.

FIG. 3 shows an example of the input video signal. In this example, the TV signal (television signal) of the NTSC system (vertical 525 lines) is basically used, and a TV signal having a horizontally long aspect ratio (9:16) with an aspect ratio close to that of a video screen is used as an input signal. The effective rate on this screen is
%, Information of 495 × 880 pixels is generated for 30 screens per second and is supplied to the video signal input terminal 3 of FIG.

This composite video signal corresponds to the AD of FIG.
After being converted into digital data by the converter 6, the video signal processing circuit 9 performs signal processing of components (for example, luminance Y: color difference RY: color difference BY = 4: 2: 2) as needed. It Here, if the luminance signal Y per pixel is quantized by 8 bits and the color difference signals RY and BY are quantized by 8 bits at a sampling rate of 1/2, respectively,
The information processing amount becomes about 700 Gbit in one hour.

By the way, a stereo audio signal of 48 KHz /
The information processing amount in 16-bit digitization is about 5.5 Gbit per hour, and when the above-mentioned compression processing is applied to this, the total of the video signal and the audio signal becomes about 4 Gbit.

Next, the reproducing operation will be described. When a reproducing operation is instructed by a reproducing key (not shown) included in the operation keys 19, the system controller 16 displays on the display device 20 that the reproducing operation is being performed. Further, the memory controller 17 controls the memory address and read / write switching, and reads the information stored in the above-described recording operation from the main memory 18.

Then, a predetermined amount of information is read out per unit time based on the read ID data. In the above example, the predetermined information amount is 30 screens of video data per second and 1 second of stereo (or 2 channels).
It is the information amount of voice data and ID data for searching these data.

The above three types of data are supplied to the data distribution circuit 21 in a mixed state (state of serial data information). According to this data format, the main memory 18
It is also possible to increase the number of devices and to adopt a replaceable memory form such as an IC card.

The ID data, the mixed data of the video data and the audio data supplied to the data distribution circuit 21 are distributed and supplied to the search information reproduction circuit 22, the video data expansion circuit 24 and the audio data expansion circuit 25, respectively.

Regarding the ID data, in the search information reproducing circuit 22, 8 IDs as shown in FIG.
The basic information of the type is detected, and the display information generating circuit 23 generates the display information for the monitor from this information. And
This display information and the video information restored as described later are combined by the adder 27, and then converted into a versatile analog video signal by the DA converter 28, and the video monitor 3
Display at 0.

For the video data, the video data decompression circuit 24 performs a data decompression process that is the reverse of the data compression process during recording, and reconstructs a video signal equivalent to the input signal during recording. Then, the reconstructed video signal is supplied to the adder 27 for synthesizing the video signal for display on the video monitor 30 via the data selection circuit 26, and is also supplied to the video data output terminal 32.

For the audio data, the audio data expansion circuit 25 performs the data expansion processing opposite to the data compression processing at the time of recording in the same manner as the video data, and reconstructs the audio signal equivalent to the input signal at the time of recording. Then, the reconstructed audio signal is sent to the audio monitor 3 via the data selection circuit 26.
The audio signal is supplied to the DA converter 29 for generating the audio signal for reproduction at 1, and is also supplied to the audio data output terminal 33.

Regarding each of the video and audio data, the above-mentioned ID data is used to correct the deviation due to the delay time required for the reproduction signal processing and the reproduction is performed. Further, in synchronization with the information from the display information generation circuit 23, the reproduction signals of video and audio are output from the data selection circuit 26.

The structure of the main data (ID data, video data and audio data) and the details of the processing of these data have been described above. Next, the present invention is used to improve the searchability of data. A first example of the data file will be described with reference to FIGS.

As shown in FIG. 4, the recording / reproducing apparatus according to the present embodiment includes an AV data file (using the storage area of the solid-state storage element) 40 for storing main AV data (video data and audio data). , A system controller 45 for performing various controls of the apparatus, and operation keys 46 for inputting various instructions to the system controller 45,
A basic configuration including an information processing circuit 41 that performs data processing in response to an instruction from the system controller 45 and an information input / output circuit 42 that performs processing related to input / output of information, an ID file 43 for data retrieval, and It is configured by an ID generation circuit 44 that generates this ID file 43.

Since the above-described basic configuration is a rewrite of the configuration included in FIG. 1 described above, redundant description will be omitted below, and only description regarding data retrieval using a data file will be given. I shall. Hereinafter, description will be made by taking as an example a case where shooting using a video camera (not shown) and data search based on ID information are performed.

First, the operation during recording (when shooting with a video camera) will be described. AV signal input terminal 4
In the state where video and audio signals are supplied to the recording / reproducing apparatus from a video camera (not shown) via 7, 48,
When a shooting key (not shown) included in the operation keys 46 is used to input a shooting start or shooting end instruction, the system controller 45 issues an instruction to the ID generation circuit 44 to generate or cancel ID information.

In response to this command, the ID generation circuit 44 issues a command to newly create or update the ID file 43 in response to the shooting start instruction, and to send the ID file 4 in response to the shooting end instruction.
Issue the generation stop command of 3. Thereby, for example, an ID file 43 for data search as shown in FIG. 5 is generated,
Or update. Start No. in the figure. And end No.
Indicates a start ID number and an end ID number of a data block in which AV data recorded from the start to the end of shooting is stored. The ID generated at every constant time T ₀ shown in FIG. It corresponds to the number.

As described above, in response to the shooting start / end instruction from the operation key 46, the ID generation circuit 44 causes the ID file 4 including the head ID number and the end ID number of the recorded data.
Although the case where 3 is generated has been described, the configuration may be such that information such as the amount of recorded data is directly written from the AV data file 40 to the empty area of the ID file 43.

Next, the data search operation at the time of reproduction will be described using the configuration example of the ID file 43 shown in FIG. When searching for data, the start ID number and end ID number obtained by performing a search on the ID file 43 are used.
The storage address of the AV data extracted by accessing the ID file shown in FIG. 2B is read out, and the AV data file 40 is read using this address information.
By accessing to and reproducing the video signal and the audio signal, it is possible to search the data and perform the search reproduction in a short time.

The above-described operation procedure at the time of recording and search reproduction is shown as a flowchart in FIGS. 6 and 7.

First, the operation during recording will be described with reference to FIG. In steps S61 and S62, when the AV data recording start instruction from the operation key 46 of FIG. 4 is detected, a start ID number corresponding to the recording position on the AV data file 40 at that time is set in step S63. Then, the AV data is continuously recorded until the update instruction of the ID file 43 is issued in step S64 and the photographing end instruction is detected from the operation key 46 in step S65. During this recording, the ID number is incremented according to the number of data blocks of the recorded AV data. Step S6
When the instruction to end the shooting is detected in step 5, in step S66,
The ID number at that time is set as the end ID number, and the updating process of the ID file 43 is ended in step S67.

Next, in the case of search reproduction, in FIG. 7, in steps S71 and S72, the ID file 43 is searched and the start ID number and end ID set during recording are set.
Read the number. Then, in steps S73 to S75,
The ID shown in FIG. 2B using the read ID number
The file is accessed and the start address and end address of the address where the AV data extracted by this is stored are read. In the subsequent step S76, the AV data file 40 is accessed using this address information, and the AV data is reproduced in step S77. And
In step S78, it is detected that the AV data is reproduced up to the end address, and the search reproduction is ended.

As described above, according to the first embodiment, the AV data is recorded for each data block by using the solid-state storage element, and the fixed length search data is provided separately from the variable length AV data. A search data file is created, and A is managed by address management using this data file.
By searching the V data, it is possible to speed up the search at the time of search reproduction and efficiently use the limited storage area.

Next, a second embodiment of the data file adopted for improving the data searchability will be described with reference to FIGS. FIG. 8 is a block diagram showing the configuration of the recording / reproducing apparatus for realizing the data search according to the present embodiment, and the portions corresponding to those in FIG. 4 showing the above-mentioned first embodiment are assigned the same reference numerals. Detailed description is omitted.

First, the recording operation will be described. The index generation circuit 52 is a system / system which is issued in response to a shooting start / end instruction input from the operation key 46.
In response to the instruction from the controller 45, the index information for data search is generated.

This index information corresponds to the headings of chapters and paragraphs in books, and movements and measures in music. In this embodiment,
As an example, the shooting / recording start / end instruction information is assigned as a subheading, and the power ON / OFF information is assigned as a middle heading. Further, if the date information obtained from the calendar clock generation circuit 14 of FIG. 1 is assigned as a major heading and the change of each information is detected and the value is updated, the index information can be updated easily. Can be generated automatically. If more complicated index information is to be generated, it can be arbitrarily generated according to preference by manually generating it using a setting key or the like not shown.

An example of the structure of the index information is shown in FIG. In the example of FIG. 9, the index information can be set from level I to level IV, the above-mentioned large, medium and small heading information is assigned to level I to level III respectively, and all zeros are assigned to level IV because they are unused. There is.

That is, every time the instruction to start or end the photographing recording is detected from the operation key 46 of FIG.
The information of is updated one by one. Also, turn the power on or O
Every time it is set to FF, the level II information is updated one by one and the level III information is reset. Furthermore, the level I information is updated by 1 each time it is detected that the date has changed due to the above date information, and the level II and level III information is reset. Then, the index word is configured in the minimum level unit generated in this way.

The index generation circuit 52 registers the index table name in the table file 51 as needed. This table of contents name is, for example, given a name according to the content of the recorded AV data so that the searcher can easily grasp the recorded content at the time of later data search. Then, a searcher can give a desired name by using an operation key (not shown). Of course, it is not necessary to register the table of contents name,
It can be blank.

The index generation circuit 52 issues a generation / generation stop command of the ID file 43 in response to an instruction from the system controller 45, and generates the ID file 43 in the same manner as in the first embodiment. In the ID file 43, the start ID number and the end ID number of the record data are recorded as in the first embodiment.

Next, the data search operation at the time of reproduction will be described using the example of the structure of the data file shown in FIG.
First, the change point of the desired index level designated by the searcher is searched from among the level I to level III of the index information. Then, the information of the index word thus detected is displayed on a display (not shown) through the video output terminal 50 of FIG. 8, and the searcher is made to select which of the detected index data is to be searched. The desired index level search is, for example, a search using only level I when it is desired to roughly grasp the entire memory area, and a search for checking the change point of information of level III when performing a detailed search. That's what it means.

If the table of contents name corresponding to the detected index is registered in the table of contents file 51, the table of contents name is displayed on the display. This enables the searcher to easily select an index to be searched based on the table of contents name. If the table of contents name is not registered, the ID number corresponding to the index word information is read from the ID file 43, and the ID file shown in FIG. 2B is accessed. Then, the storage address of the AV data to be extracted from now may be read and the AV data file 40 may be accessed by this address information to be displayed on the display as video information.

When the searcher selects an index, the start ID corresponding to the selected index word information
The ID number and the ending ID number are read from the ID file 43, and the AV data file 40 is accessed using the address information of the search data obtained by accessing the ID file of FIG. 2B, as in the first embodiment. By doing so, the AV data is searched and reproduced.

FIG. 10 is a flowchart showing the data file generating operation at the time of recording described above, and FIG. 11 is a flowchart showing the data searching operation at the time of reproducing. In addition, in FIG. 10 and FIG.
The same reference numerals are given to parts showing the same operations as the operations in the flowcharts shown in FIGS. 6 and 7.

In FIG. 10 showing the operation at the time of recording, when a recording start instruction is detected from the operation key 46 of FIG. 8 in steps S61 and S62, steps S101 to S105.
Then, the contents of level I to level III are updated according to the presence / absence of changes in the above-mentioned large, medium and small heading information to generate index information. When registering the table of contents name in the table of contents file 51, registration is executed in steps S106 and S107.
Then, in steps S63 to S67, the ID file 43 is generated in the same manner as in the first embodiment.

At the time of search reproduction, in step S111 and S112 in FIG. 11, a search for a desired index level change point is executed to detect index word information. If the table of contents name corresponding to the detected index / word information is registered in the table of contents file 51, the table of contents name is displayed on a display not shown in steps S113 and S114. Then, when the searcher selects the index to be searched in the next step S115, in the subsequent steps S71 to S78, the search reproduction similar to that of the first embodiment is executed for the selected index.

As described above, according to the second embodiment, it is possible to select the data to be searched based on the index word information visually displayed during the search reproduction. Compared with, it is possible to easily select and search only desired data, and it is possible to perform a search with more excellent operability.

Next, the third embodiment of the data file adopted for improving the data searchability will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 12 is a block diagram showing the structure of a recording / reproducing apparatus for realizing the data search according to the present embodiment, and the portions corresponding to those in FIG. 8 showing the above-mentioned second embodiment are assigned the same reference numerals. Detailed description is omitted.

The index generation circuit 54 uses the operation key 4
In response to the instruction from the system controller 45 issued in response to the instruction to start / end the photographing input from 6,
Generating the index information and the ID file 43 is the same as in the second embodiment described above.

In the case of this embodiment, the index generation circuit 54 further generates the time file 53 for data search. The time file 53 stores the time when the index information generation instruction is issued as time data in association with the ID file 43 corresponding to the storage location of the AV data being recorded. Therefore, if a data search as described later is performed using this time file 53, the search work based on the time can be performed quickly.

As described above, since the ID numbers forming the ID file 43 are updated at fixed time intervals T ₀ , if the start time and end time of shooting are known, an arbitrary time and AV data Correspondence with the storage location is possible.

FIG. 13 shows the above index information and ID.
The configuration example of the file 43 and the time file 53 is shown. In the time file 53, the date information of the start of shooting and the time information of hour minute second are recorded.

For example, when it is desired to reproduce and view an image taken in "summer morning" using such a data file, a search condition expression of (0701 ≤ month ≤ 0831) & (hour ≤ 09) Then, the time file 53 is searched. As a result, the parts 111 to 115 of the index information are extracted. Next, the ID numbers 0 to 89 corresponding to the indexes 111 to 115 are obtained by searching the ID file 43, and by using this ID number, FIG.
The ID file shown in is accessed to read the storage address of AV data. Then, with this address information, AV
By accessing the data file 40, it is possible to search and reproduce a desired portion.

14 and 15 are flow charts showing the data file generating operation and the data searching operation described above. 14 and 15, the same reference numerals are given to parts showing the same operations as the operations in the flowcharts shown in FIGS. 10 and 11.

At the time of shooting and recording, in steps S61 and S62 and steps S101 to S105 in FIG.
The index information is generated in response to the recording start instruction as in the second embodiment. Next, in step S141,
In S142, the contents of the time file 53 are updated based on the time information when the index information was generated, and in subsequent steps S63 to S67, the I
The D file 43 is generated.

At the time of search reproduction, a desired search condition expression is generated in steps S151 and S152 in FIG. 15, and the time file 5 is generated in steps S153 to S155.
3 is searched to extract index information satisfying this search condition expression. Next, the start ID number and the end ID number corresponding to the extracted index information are set in step S7.
1, read in S72, and then steps S73 to S78
Then, the same search reproduction as in the first embodiment is executed.

As described above, according to the third embodiment, it is possible to retrieve only the data satisfying the desired retrieval condition at the time of the search reproduction. Therefore, as compared with the first embodiment,
Only desired data can be reproduced in a short time, and search efficiency can be further improved.

[0078]

As described above, according to the present invention, when recording moving image data that has been variable-length coded, address data and ID number data indicating a storage address of the moving image data on a storage medium are recorded. The ID data consisting of is generated at regular intervals, and the moving image data and the ID data file consisting of a plurality of ID data are recorded in different areas of the storage medium. When reproducing moving image data, the I
The playback operation of moving image data is controlled based on the D data file. As a result, it is possible to easily search and reproduce the moving image data recorded in the storage medium.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a recording / reproducing apparatus of the present invention.

FIG. 2 is a configuration diagram showing a data storage state in a main memory.

FIG. 3 is a configuration diagram of a television screen for explaining an example of an input video signal.

FIG. 4 is a block diagram showing a configuration of a recording / reproducing apparatus for realizing a data search according to the first embodiment.

FIG. 5 is a diagram showing a configuration example of an ID file.

FIG. 6 is a flowchart showing an operation procedure at the time of recording.

FIG. 7 is a flowchart showing an operation procedure during search reproduction.

FIG. 8 is a block diagram showing a configuration of a recording / reproducing apparatus for realizing a data search according to a second embodiment.

FIG. 9 is a diagram showing a configuration example of a data file.

FIG. 10 is a flowchart showing an operation procedure at the time of recording.

FIG. 11 is a flowchart showing an operation procedure during search reproduction.

FIG. 12 is a block diagram showing a configuration of a recording / reproducing apparatus for realizing data search according to a third embodiment.

FIG. 13 is a diagram showing a configuration example of a data file.

FIG. 14 is a flowchart showing an operation procedure at the time of recording.

FIG. 15 is a flowchart showing an operation procedure during search reproduction.

[Explanation of symbols]

10 Audio data compression circuit 11 Video data compression circuit 12 ID generation circuit 13 Data synthesis circuit 14 Calendar clock generation circuit 15 Memory information generation circuit 18 main memory 21 Data distribution circuit 22 Search information reproduction circuit 23 Display information generation circuit 24 Video data expansion circuit 25 Audio data expansion circuit 30 video monitor 31 voice monitor 40 AV data files 43 ID file 44 ID generation circuit 51 table of contents file 52, 54 Index generation circuit 53 time file

Continuation of front page (56) Reference JP-A-5-109240 (JP, A) JP-A-4-328375 (JP, A) JP-A-3-276481 (JP, A) JP-A-6-153130 (JP , A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04N 5/76-5/956

Claims (2)

(57) [Claims] 1. A recording / reproducing apparatus for recording / reproducing variable-length-encoded moving image data on a storage medium, wherein address data and an ID indicating a storage address of the moving image data on the storage medium for each fixed period. ID generating means for generating ID data consisting of number data at regular intervals, and an ID data file consisting of the plurality of ID data generated by the ID generating means are recorded in a predetermined storage area of the storage medium. Recording means for recording the moving image data in an area different from a predetermined storage area of the storage medium, and a search ID file indicating the ID number data according to recording start and recording stop of the moving image data Do I
D file generating means, reproducing means for reproducing the moving image data and the ID data file from the storage medium, and a search ID generated by the ID file generating means
And a control means for controlling the search operation of the moving image data by the reproducing means based on the ID number data shown in the file and the ID number data and the address data in the ID data file reproduced by the reproducing means. A recording / reproducing apparatus characterized by the above. 2. The recording / reproducing apparatus according to claim 1, wherein the recording unit generates a data block for each moving image data for the fixed period, and the address data indicates a head address of the data block. .