JP3799075B2 - Recording device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a recording apparatus for a recording medium such as a disc capable of recording data such as music.
[0002]
[Prior art]
A data rewritable disk medium on which a user can record music data or the like is known, and in a magneto-optical disk which is one of such disk media, a laser having a higher level than that during reproduction by an optical head, for example. Recording is performed by irradiating light to heat the recording area to the Curie temperature or higher and applying an N or S magnetic field to the recording area from the other surface of the disk by the magnetic head. For example, a signal in which audio data is subjected to a predetermined modulation process is supplied to the magnetic head. Since the magnetic head applies an N or S magnetic field according to the modulation signal, the audio data is recorded as information on the magnetic field direction on the disk. Is recorded. Such a recording apparatus is implemented as a recording apparatus using a magneto-optical disk known as a mini disk as a recording medium.
[0003]
As audio information supplied for recording in such a recording apparatus, for example, an analog audio signal supplied from an analog tape player or LP record player or via an analog output terminal in a CD player or the like is used. When such an analog audio signal is supplied, the recording device converts it into digital data and performs recording. Also, the digital output of a CD player, the digital output of a mini disc player, for example, and the digital output of a DAT player are input as they are and recorded.
[0004]
By the way, when the audio signals supplied from various sources are recorded in the recording device (mini disc recording device) in this way, for example, the track number (music number) assigned to each music piece in the CD software or the like, Track management is also performed by automatically attaching the recorded music. In order to perform such track number management, it is detected that the music has changed for the supplied analog or digital audio signal.
[0005]
In particular, when an input signal is supplied as digital data from a CD player or the like via a digital interface, the subcode data is also sent at the same time, so if the track number information in the subcode data is taken in as it is, the recorded music Track number management (number update) can be easily performed.
[0006]
Here, for example, in a CD player, a user searches for music and plays a desired track, or performs so-called program playback to play back in a favorite music order, and a search operation (track jump) is performed during the playback operation. Considering such a case, the subcode data changes unnecessarily, for example, when subcode data of another track is extracted or erroneous data is detected. At this time, if only the change of the track number information in the subcode data is monitored on the recording device side and the track number is updated, an incorrect track number is attached to the recorded music. Become.
Therefore, in the conventional recording apparatus, after the change of the track number as the subcode data is detected, the level of the audio signal becomes equal to or higher than a predetermined value, and the time information (time information recorded as the subcode) is immediately before that. ) Is obtained, it is determined that the next track has started, and the track number update process for the recorded data is performed. As a result, it is possible to prevent the track number from being updated unnecessarily on the recording side during access on the CD side.
[0007]
[Problems to be solved by the invention]
However, in such a process, when the playback-side recording medium is also a mini-disc, and when the user wants to create a mini-disc having the same recording contents as the playback-side mini-disc, the dubbing is performed. Inconvenience will occur.
[0008]
For example, assume that a track N and a track N + 1 are set for audio data in the reproduction-side minidisc as shown in FIG. Of the control data transmitted to the recording apparatus along with the audio data by the digital interface at this time, the track number information is as shown in FIG.
Here, as described above, if the recording apparatus updates the track number when audio data (and data continuity) of a certain level or higher is detected after the track number is changed, FIG. Using such level detection information, the track number is updated in the state shown in FIG. In other words, the track change point is shifted between the mini disc on the source side and the dubbed mini disc.
[0009]
This is not a big problem if you just listen to music as a general purpose, but for example, you can make a disc with the exact silence time at the beginning of the track as a master disc for business use. When trying to manufacture a disk to be used by dubbing, it becomes a big problem.
In other words, the conventional dubbing method has a problem that it is impossible to manufacture a disc having the same contents including the track change point as shown in FIG.
[0010]
[Means for Solving the Problems]
The present invention has been made in view of these problems, and at least control data is transmitted by a digital interface, and when the audio is analog or digitally transmitted and recorded by dubbing, the same up to the track change point is included. It is an object of the present invention to provide a recording apparatus capable of producing a recording medium having contents.
[0011]
For this purpose, a first type device in which track information that is set in the device corresponding to the reproduced audio signal and is suppressed in transmission during a predetermined operation is transmitted together with the reproduced audio signal, and a recording medium together with the reproduced audio data Recording apparatus that records input audio data on a recording medium that can be connected to a second type device that reads and transmits the track information read from the recording medium even during a predetermined operation Is an input means for inputting a digital audio data string comprising an identifier representing the model type of the transmission source, audio data, and track information corresponding to the audio data, and a model type of the transmission source input to the input means. Type discriminating means for discriminating whether the transmission source is the first type device or the second type device based on the identifier to be represented, and the input And track information detecting means for detecting a change in the track information on the basis of the track information corresponding to the audio data inputted to stage, and level detecting means for detecting the level of the audio data inputted to the input means, Time information determination means for determining the continuity of time information corresponding to the input audio data included in the digital audio data sequence transmitted from the second type device; When the transmission source is determined to be the first type device by the type determination unit, the track information on the recording side is changed based on the change of the track information detected by the track information detection unit, and the type When the discriminating unit determines that the transmission source is the second type device, the track information detecting unit detects a change in the track information, and then the audio input to the input unit by the level detecting unit Detects that the data level exceeds the specified value At the same time, the time information discriminating means detects that the continuity of the time information immediately before the level exceeds a predetermined value is maintained. And a control means for controlling to change the track information on the recording side based on the above.
[0012]
Also supports playback audio data do it Set inside the device Track information for which transmission is suppressed during a specified operation. Along with the above playback audio data transmission First equipment When The second device in which the track information read and transmitted from the recording medium together with the reproduced audio data is read and transmitted from the recording medium even during a predetermined operation Can be connected, A recording method for recording input audio data on a recording medium is as follows. An input step in which a digital audio data string including an identifier representing a model type of a transmission source, audio data, and track information corresponding to the audio data is input; Based on the identifier representing the model type of the transmission source of the digital audio data sequence including the input identifier representing the model type of the transmission source, audio data, and track information corresponding to the audio data, the transmission source is the first type device A type determining step for determining whether the device is a second type device, A level detection step for detecting the level of the audio data input in the input step; When the transmission source is determined to be the first type device in the type determination step, the change of the track information is detected based on the track information corresponding to the input audio data, and the detected track information is changed. Track information on the recording side based on the track information corresponding to the input audio data when the transmission source is determined to be the second type device in the type determination step After detecting changes in By the above level detection step That the audio data level is above the specified value When detecting that the continuity of the time information corresponding to the audio data included in the inputted audio data sequence immediately before the level becomes equal to or higher than the predetermined value is maintained And changing the track information on the recording side.
[0013]
[Action]
In the control data transmitted from the second type device such as a CD player, the track number information in the subcode read from the disc is transmitted. For example, when a track jump or the like is performed on the playback side, it is unnecessary during that time. Track number information is transmitted. For this reason, the track change processing on the recording side needs to comprehensively judge by monitoring not only the track information change but also the audio level and continuity.
However, in the first type device such as a mini-disc player, the track number information to be transmitted is set and output by the controller, so that unnecessary track information can be transmitted even if track access is performed midway. There is no. Therefore, if the recording side monitors only the change of the track information, the track change process can be executed at the same exact timing as the reproduction side disc.
[0014]
【Example】
Embodiments of the recording apparatus of the present invention will be described below with reference to FIGS. The description will be given in the following order.
1. Configuration of recording / playback device
2. U-TOC
3. Subcode
4). Digital audio interface
5. Track change processing during recording by the recording / playback device
[0015]
[1. Configuration of recording / reproducing apparatus]
FIG. 1 shows a block diagram of a main part of a recording / reproducing apparatus using a magneto-optical disk (mini disk) as a recording medium according to an embodiment of the present invention.
Reference numeral 1 denotes, for example, a magneto-optical disk on which a plurality of music pieces (audio data) are recorded, and is rotated by a spindle motor 2. An optical head 3 irradiates a laser beam to the magneto-optical disk 1 at the time of recording / reproducing, and at the time of recording provides a high level laser output for heating the recording track to the Curie temperature, and at the time of reproduction by the magnetic Kerr effect. A relatively low level laser output for detecting data from the reflected light.
[0016]
For this reason, the optical head 3 has a laser diode as laser output means, Polarization An optical system including a beam splitter, an objective lens, and the like, and a detector for detecting reflected light are mounted. The objective lens 3a is held by a biaxial mechanism 4 so as to be displaceable in the radial direction of the disk and in the direction of contacting and separating from the disk, and the entire optical head 3 can be moved in the radial direction of the disk by the sled mechanism 5. Reference numeral 6a denotes a magnetic head for applying a magnetic field modulated by the supplied data to the magneto-optical disk, which is disposed at a position facing the optical head 3 with the magneto-optical disk 1 in between. The magnetic head 6 a can be moved in the disk radial direction by the thread mechanism 5 together with the optical head 3.
[0017]
Information detected from the magneto-optical disk 1 by the optical head 3 by the reproducing operation is supplied to the RF amplifier 7. The RF amplifier 7 performs processing of the supplied information to generate a reproduction RF signal, tracking error signal, focus error signal, groove information (absolute position information recorded as a pregroove (wobbling groove) on the magneto-optical disk 1), and the like. Extract. The extracted reproduction RF signal is supplied to the encoder / decoder unit 8. The tracking error signal and the focus error signal are supplied to the servo circuit 9, and the groove information is supplied to the address decoder 10 and demodulated. The address information decoded from the groove information and the address information recorded as data and decoded by the encoder / decoder unit 8 are supplied to a system controller 11 constituted by a microcomputer. Also, subcode data, focus monitor signal, CLV clock information, etc. are extracted and supplied to the system controller 11.
[0018]
The servo circuit 9 generates various servo drive signals based on the supplied tracking error signal, focus error signal, track jump command, access command, rotational speed detection information from the system controller 11, and the like, and the biaxial mechanism 4 and the sled mechanism 5 To control the focus and tracking, and the spindle motor 2 is controlled to a constant linear velocity (CLV).
[0019]
The reproduced RF signal is subjected to decoding processing such as EFM demodulation and CIRC by the encoder / decoder unit 8, and is temporarily written in the buffer RAM 13 by the memory controller 12. The reading of data from the magneto-optical disk 1 by the optical head 3 and the transfer of reproduction data from the optical head 3 to the buffer RAM 13 are performed at 1.41 Mbit / sec.
[0020]
The data written in the buffer RAM 13 is read out at the timing when the reproduction data is transferred at 0.3 Mbit / sec and supplied to the encoder / decoder unit 14. Then, reproduction signal processing such as decoding processing for audio compression by the modified DCT processing is performed, converted to an analog signal by the D / A converter 15, supplied from a terminal 16 to a predetermined amplifier circuit unit, and reproduced and output. For example, it is output as L and R audio signals.
[0021]
When a recording operation by analog transmission is performed on the magneto-optical disk 1, for example, an audio signal from a CD player, a tape player, or another mini-disc player is supplied to the terminal 17.
The recording signal (analog audio signal) supplied to the terminal 17 is converted into digital data of 44.1 KHz sampling and 16-bit quantization by the A / D converter 18 and then supplied to the encoder / decoder unit 14 for audio compression. Encoding process is applied. That is, the data amount is compressed to about 1/5 by the modified DCT process.
[0022]
The recording data compressed in the encoder / decoder unit 14 is once written in the buffer RAM 13 by the memory controller 12, read out at a predetermined timing, and sent to the encoder / decoder unit 8. The encoder / decoder unit 8 performs encoding processing such as CIRC encoding and EFM modulation, and then supplies the magnetic head driving circuit 6 with the encoded data.
[0023]
The magnetic head drive circuit 6 supplies a magnetic head drive signal to the magnetic head 6a in accordance with the encoded recording data. That is, an N or S magnetic field is applied to the magneto-optical disk 1 by the magnetic head 6. At this time, the system controller 11 supplies a control signal to the optical head 3 so as to output a recording level laser beam.
[0024]
Reference numeral 23 denotes a terminal as a digital audio interface with an external device. Data input from the terminal 23 is supplied to the digital audio interface unit 21.
When a digital audio interface is connected, audio information reproduced on an external CD player or minidisc player is supplied as digital data, and at the same time, control data including subcode information on the reproduction side in a predetermined format is received. Will be transmitted.
[0025]
The digital audio interface unit 21 extracts audio data (44.1 KHz sampling, 16-bit quantization) from the supplied data, and supplies it to the encoder / decoder unit 14 as recording data.
Also, control data SS such as subcode information is extracted and supplied to the system controller 11. For example, U-bit data, C-bit data, V-bit data, and P-bit data exist as control data SS transmitted from a CD player or the like.
[0026]
The U bit data includes subcode data known as so-called Q, R, S, T, U, V, and W data, and C bit data is category data for determining the recording medium, sampling Frequency data, clock data, optical system data, and the like are included. The V bit data includes an error flag and the like. Further, the P bit data is a parity bit.
Although the format on the digital audio interface related to these control data will be described later, the system controller 11 manages various recording operations using the required data of these control data SS, and in particular tracks the data being recorded. A process for updating the number is executed.
[0027]
An audio level detection unit 22 detects the level of the audio data transmitted by the digital interface, and the level information S _LV Is supplied to the system controller 11. Thus, the system controller 11 detects the presence / absence of audio data input to the encoder / decoder unit 14, and this is also used for track number management.
[0028]
Reference numeral 19 denotes an operation input unit provided with keys used for user operations, and 20 denotes a display unit configured by, for example, a liquid crystal display.
The operation input unit 19 is provided with a recording key, a reproduction key, a stop key, an AMS key, a search key and the like for user operations.
The display unit 20 displays time information such as the total performance time of the disc, the progress time during playback and recording, and various displays such as the track number, operation state, and operation mode based on the control of the system controller 11.
[0029]
By the way, when recording / reproducing operation is performed on the disc 1, it is necessary to read management information recorded on the disc 1, that is, P-TOC (pre-mastered TOC) and U-TOC (user TOC). The system controller 11 determines the address of the area to be recorded on the disc 1 and the address of the area to be reproduced according to the management information. This management information is held in the buffer RAM 13. For this reason, the buffer RAM 13 is divided into the recording data / reproduction data buffer area and the area for holding the management information.
[0030]
Then, the system controller 11 reads out the management information by executing the reproducing operation on the innermost circumference side of the disc on which the management information is recorded when the disc 1 is loaded, and stores it in the buffer RAM 13. Thereafter, it can be referred to when recording / reproducing the disc 1.
The U-TOC is edited and rewritten according to data recording or erasing, but the system controller 11 changes this editing processing to U-TOC information stored in the buffer RAM 13 every time recording / erasing is performed. The U-TOC area of the disk 1 is also rewritten at a predetermined timing according to the rewriting operation.
[0031]
The P-TOC is recorded on the disk 1 as pit data, and the basic disk structure, for example, a recordable magneto-optical area, lead-out area, U-TOC area, and other addresses are recorded. Also, track management information is recorded as reproduction-only data in a reproduction-only premastered disk or a hybrid disk in which a reproduction-only area and a recordable area coexist.
On the other hand, in the U-TOC, track management information about a recordable area (free area), recorded music, etc., and character information and date / time information corresponding to each track are recorded.
Here, the U-TOC sector recorded in the sector data format on the disc 1 will be described.
[0032]
[2. U-TOC]
FIG. 3 shows the format of the first sector (sector 0) of the U-TOC. The management information mainly relates to music recorded by the user and unrecorded areas (free areas) where new music can be recorded. It is a recorded data area. U-TOC can be set from sector 0 to sector 7, sector 1 and sector 4 are character information corresponding to the track, and sector 2 is an area in which recording date and time information corresponding to the track is recorded. . Description of these will be omitted.
[0033]
For example, when recording a certain piece of music on the disk 1, the system controller 11 searches for a free area on the disk from the U-TOC sector 0 and records audio data therein. Further, at the time of reproduction, an area in which music to be reproduced is recorded is determined from the U-TOC sector 0, and the area is accessed to perform a reproduction operation.
[0034]
In the U-TOC sector 0 shown in FIG. 3, a sync pattern is first recorded with 12 bytes, and then addresses (Cluster H and Cluster L) are recorded as headers. And at the specified address position, the manufacturer code, model code, track number (First TNO) of the first track, track number (Last TNO) of the last track, used sector, disk serial number, disk ID, etc. Data is recorded.
Furthermore, various table pointers (P-DFA, P, etc.) are used as correspondence table instruction data portions in order to identify the recorded music areas and free areas by making them correspond to the management table portions described later. -EMPTY, P-FRA, P-TNO1 to P-TNO255) are recorded.
[0035]
Then, 255 parts tables (01h) to (FFh) are provided as management table sections corresponding to the table pointers (P-DFA to P-TNO255), and each part table has a certain part. The start address as the starting point, the end address as the end, and the mode information (track mode) of the part are recorded. Furthermore, since the parts indicated in each part table may be connected to other parts in succession, link information indicating the part table in which the start address and end address of the connected part are recorded can be recorded. It is made like that. A part refers to a track portion where temporally continuous data is continuously recorded as physical positions.
In the present specification, numerical values with “h” are in so-called hexadecimal notation.
[0036]
In this type of recording / playback apparatus, for example, even if the data of one piece of music is recorded physically discontinuously, that is, over a plurality of parts, the playback operation is hindered by playing back while accessing between parts. For this reason, there are cases where music recorded by the user is recorded in multiple parts for the purpose of efficient use of the recordable area.
For this reason, link information is provided, for example, the numbers (01h) to (FFh) given to each part table (actually indicated by a numerical value that is a byte position in the U-TOC sector 0 by a predetermined calculation process) By specifying the parts table to be linked, the parts table can be linked.
[0037]
In other words, in the management table section in the U-TOC sector 0, one part table represents one part. For example, for music composed of three parts connected, three parts connected by link information. The position of each part is managed by the table.
[0038]
Each part table from (01h) to (FFh) in the management table section of U-TOC sector 0 is as follows depending on the table pointer (P-DFA, P-EMPTY, P-FRA, P-TNO1 to P-TNO255) The contents of the part are shown as follows.
[0039]
The table pointer P-DFA indicates a defect area on the magneto-optical disk 1 and is the head of one part table or a plurality of part tables indicating a track portion (= part) that becomes a defect area due to a scratch or the like. The parts table is specified. In other words, if there is a defective part, one of (01h) to (FFh) is recorded in the table pointer P-DFA, and the defective part is indicated by the start and end addresses in the corresponding parts table. . When there are other defective parts, other part tables are designated as link information in the parts table, and the defective parts are also indicated in the parts table. If there is no other defective part, the link information is, for example, “(00h)”, and there is no link thereafter.
[0040]
The table pointer P-EMPTY indicates the first part table of one or more unused part tables in the management table section. If there is an unused part table, the table pointer P-EMPTY is (01h ) ~ (FFh) is recorded. When there are multiple unused part tables, the part tables are specified sequentially by link information from the part table specified by the table pointer P-EMPTY, and all unused part tables are linked on the management table section. Is done.
[0041]
The table pointer P-FRA indicates a free area (including an erasure area) in which data can be written on the magneto-optical disk 1, and one or a plurality of parts indicating a track portion (= part) as a free area. The first part table in the table is specified. In other words, if there is a free area, one of (01h) to (FFh) is recorded in the table pointer P-FRA, and the part table corresponding to it is indicated by the start and end addresses. Has been. Further, when there are a plurality of such parts, that is, there are a plurality of parts tables, the part information in which the link information is “(00h)” is sequentially designated by the link information.
[0042]
FIG. 4 schematically shows the management state of the parts that become free areas using the parts table. This means that when the parts (03h) (18h) (1Fh) (2Bh) (E3h) are set as free areas, this state is the part table (03h) (18h) (1Fh) following the corresponding table instruction data P-FRA. The state represented by the link (2Bh) (E3h) is shown. The above-described defect area and unused part table management form are also the same.
[0043]
By the way, if the magneto-optical disc has no recording of audio data such as music and has no defects, the parts table (01h) is specified by the table pointer P-FRA, which makes the entire recordable user area of the disc. Is shown as a free area. In this case, since the remaining (02h) to (FFh) parts tables are not used, the parts table (02h) is specified by the table pointer P-EMPTY described above, and the parts table (02h) The parts table (03h) is specified as the link information, and so on. In this case, the link information of the parts table (FFh) is “(00h)” indicating no connection thereafter.
At this time, in the parts table (01h), the start address of the recordable user area is recorded as the start address, and the address immediately before the lead-out start address is recorded as the end address.
[0044]
Table pointers P-TNO1 to P-TNO255 indicate the music recorded by the user on the magneto-optical disk 1. For example, the table pointer P-TNO1 includes one or a plurality of parts in which data of the first music is recorded. A parts table that shows the first part of the time is specified.
For example, if the first song is recorded as a single part on the disc without the track being divided, the first recording area is the start and end addresses in the part table indicated by the table pointer P-TNO1. It is recorded as.
[0045]
Also, for example, when the second music piece is recorded discretely on a plurality of parts on the disc, each part is designated according to the temporal order to indicate the recording position of the music piece. In other words, from the part table specified in the table pointer P-TNO2, other part tables are further specified in accordance with the time order in accordance with the link information, and the part table in which the link information becomes “(00h)” is linked. (The same form as in FIG. 4 above).
In this way, for example, all the parts in which the data constituting the second music is recorded are sequentially designated and recorded, so that the data of the U-TOC sector 0 is used to reproduce the second music or the second music. When overwriting the area, it is possible to access the optical head 3 and the magnetic head 6 to extract continuous music information from discrete parts, or to record using the recording area efficiently.
[0046]
The music and free area recorded as described above are performed by the U-TOC. When a change in track number for audio data is detected during recording, the U-TOC is rewritten so that the recorded data is managed as a different track on the U-TOC.
[0047]
[3. Subcode]
Here, subcodes recorded on a CD (compact disc) or a minidisc will be described.
As is well known in the CD system, the minimum unit of data to be recorded is one frame, and one block is composed of 98 frames.
The structure of one frame is as shown in FIG. 6, that is, one frame is composed of 588 bits, the head 24 bits are the synchronization data, and the subsequent 14 bits are the subcode data area. After that, data and parity are arranged.
[0048]
One block is composed of 98 frames having this structure, and the subcode data extracted from the 98 frames is collected to form one block of subcode data as shown in FIG.
The subcode data from the first and second frames (frame 98n + 1, frame 98n + 2) at the head of the 98 frames is a synchronization pattern. In the third frame to the 98th frame (frame 98n + 3 to frame 98n + 98), 96-bit channel data, that is, subcode data of P, Q, R, S, T, U, V, and W is formed. .
[0049]
Of these, the P channel and the Q channel are used for access management. However, the P channel only shows a pause portion between tracks, and finer control is performed on the Q channel (Q ₁ ~ Q ₉₆ ). The 96-bit Q channel data is configured as shown in FIG.
[0050]
First Q ₁ ~ Q _Four These 4 bits are used as control data CTL, and are used for the number of audio channels, emphasis, CD-ROM identification, and the like.
That is, 4-bit control data is defined as follows.
"0 ***" ... 2 channel audio
"1 ***" ... 4 channel audio
"* 0 **" ... CD-DA (CD digital audio)
"* 1 **" ... CD-ROM
"** 0 *" ... Digital copy not possible
"** 1 *" ··· Digital copy available
"*** 0" ... No pre-emphasis
"*** 1" ... Pre-emphasis available
[0051]
Next, Q _Five ~ Q ₈ 4 bits of the address is the address Ad, which is Q ₉ ~ Q ₈₀ The control bit of the data.
If the 4 bits of this address are “0001”, the following Q ₉ ~ Q ₈₀ This sub-Q data indicates that it is Q data for an audio CD.
And Q ₉ ~ Q ₈₀ 72 bits of sub-Q data and the remaining Q ₈₁ ~ Q ₉₆ Is a CRC.
[0052]
Q as subcode content ₉ ~ Q ₈₀ 72 bits are 8 bits each and the information shown in FIG. 5A is recorded. First, a track number (TNO) is recorded. That is, each of the tracks # 1 to #n has a value of “01” to “99”. In the lead-out area, the track number is “AA”.
Subsequently, information that can further subdivide each track is recorded as an index (INDEX).
[0053]
Then, MIN (minute), SEC (second), and FRAME (frame number) are indicated as the elapsed time in the track.
Further, absolute time addresses are recorded as minutes (AMIN), seconds (ASEC), and frame numbers (AFRAME) as AMIN, ASEC, and AFRAME. The absolute time address is time information that is set to 0 minute 0 second 0 frame at the start point of the first track and is continuously assigned until the lead-out. That is, this is absolute address information for managing each track on the disc.
[0054]
On the other hand, the Q data structure of the mini disk is as shown in FIG.
In the case of a mini disc, a track number (TNO), index information (INDEX), and a CRC code are provided, but time information is not added.
[0055]
When another device such as a CD player or a mini disc player is connected to the recording / reproducing apparatus of the present embodiment through a digital interface and reproduction data is supplied, the transmission data includes reproduction audio data and these subcodes. There will also be information based. As a result, the recording / reproducing apparatus of the present embodiment, that is, the apparatus that becomes the recording side at the time of dubbing, can detect a change in the track number of the reproduction-side audio data from the reproduction-side subcode information.
[0056]
[4. Digital audio interface]
Here, a format when data is transmitted from the playback side apparatus to the recording / playback apparatus of the present embodiment using the digital audio interface will be described.
FIG. 8 shows a digital audio interface format (hereinafter referred to as I / O format).
[0057]
In the I / O format, as shown in FIG. 8A, the sampling period (1 / F _S ) Is one frame, which is the basic unit. The digital output signals of the left (L) channel and right (R) channel in one frame are transmitted from the LSB (least significant bit) to the MSB (most significant bit) in the order of the left channel → the right channel. Is done.
Data corresponding to each channel is referred to as a subframe, and FIG. 8B shows the configuration of the subframe.
A sub-frame is composed of 32 bits, and one sub-frame is composed of two sub-frames which are both left and right channels.
[0058]
The first 4 bits of the subframe are used as a preamble and are used for synchronization and identification of the subframe.
The subsequent 4 bits are reserved bits (AUX). Following the reserved bits, 20 bits of audio data D as main data are stored. _A Is arranged.
Audio data D _A Is followed by control data represented by V, U, C, and P, one bit each.
[0059]
The V bit is a valid flag. If the valid flag is “0”, the data of this subframe is valid (reliable), and if it is “1”, it is invalid (unreliable). The receiving device can make a judgment on the data processing operation based on the validity flag.
[0060]
The U bit is user data. As data having an average of 1176 bits collected from each subframe in which the U bits are transmitted, for example, control data as shown in FIG. 10, that is, a subcode is represented.
First, the subcode synchronization pattern shown in FIG. 7 is arranged as data corresponding to the 0th and 1st frames. As shown in FIG. 10, one U-bit frame is formed of 12 bits. In this example, the last 4 bits are dummy bits in each frame.
[0061]
Subsequently, for the second frame to the 97th frame, the start bit “1” is arranged at the head, followed by the data of subcodes Q to W and 4-bit dummy data shown in FIG.
That is, the U-bit is filled with the data of the subcodes Q to W such as the reproduction side CD and the mini disc as they are. In the case of FIG. 10, the distance between the start bit and the start bit is 12 bits, but by changing the number of dummy bits, the distance between the start bits can be varied between 8 and 16 bits. .
[0062]
The C bit shown in FIG. 8 is channel status data.
As the channel status, a data format is defined in which 192 C bits (1 word) included in each subframe are collected. FIG. 9 shows a channel status format.
[0063]
The first bit (bit 0) of one word distinguishes whether the transmission side device is for home use or business use. Subsequently, control information is recorded in 5 bits from bit 1 to bit 5. For example, bit 2 is an identification bit for copyright protection, and bit 3 is an identification bit for the presence or absence of emphasis.
Subsequently, bits 8 to 15 are set as a category code CC. Bit 15 is called an L bit and indicates the generation of digital audio data. Generally, in the case of commercially-recorded software, bit 15 is set to “1”. Bits 8 to 14 are given specific codes according to the transmission side equipment.
For example, the category code CC is defined as “1001001L” if the transmission side is a mini disc system, and the category code CC is defined as “1000000L” if the transmission side is a compact disc system.
[0064]
Subsequently, bits 16 to 19 are source numbers, which are used for identification when a plurality of devices of the same category are connected.
Bits 20 to 23 are channel numbers and indicate the channel type of the digital audio interface.
Bit 24 to bit 27 are assigned a sampling frequency identification code, and bits 28 and 29 indicate the accuracy of the sampling frequency.
Bit 32 and subsequent bits are unused.
[0065]
The P bit shown in FIG. 8B is a parity bit. For example, even parity is used as the parity bit, a spare bit, audio data D _A , V, U, and C are used for error detection.
[0066]
[5. Track change processing during recording by the recording / playback device]
The processing when the recording / reproducing apparatus of this embodiment records the audio data transmitted through the digital audio interface as described above on the disc 1, particularly the processing related to the update of the track number for the recorded data will be described with reference to FIG. .
FIG. 2 shows the processing of the system controller 11 regarding the update of the track number during the recording operation.
[0067]
Now, in the recording / reproducing apparatus of the present embodiment, the terminal 23 is connected to a certain source device, and the reproduction data from the source device is input and supplied to the digital audio interface unit 21. To do. It is assumed that the digital audio data extracted by the digital audio interface unit 21 is subjected to an audio compression process, an EFM, and a CIRC encoding process and recorded on the disc 1.
[0068]
During such a recording operation (F101), the system controller 11 monitors the change of the track number for the digital audio data from the source side (F102). The change of the track number can be detected by monitoring the track number TNO included in the U bit.
If a change in the track number is detected, the type of device on the source side is subsequently determined. Here, it is determined whether the source side is a mini-disc player or another type of device such as a CD player. This determination can be made by the category code CC in the C bit.
[0069]
Here, for example, assume that the source side is a CD player.
In this case, the system controller 11 proceeds to step F104 after detecting the track change on the source side. And the continuity about the supplied data is confirmed. This continuity can be confirmed by monitoring the data serving as the absolute time information AMIN, ASEC, AFRAME from the subcode data included in the U bit.
When the continuity of data is confirmed, it is determined whether or not the supplied audio level is equal to or higher than a predetermined value (F105). That is, the detection information from the audio level detection unit 22 is confirmed.
[0070]
In step F104, data continuity is confirmed, and in step F105, the audio level is Predetermined value If it is determined that the above has been reached, the process proceeds to step F106 to set a track update point for the recorded audio data. That is, if the data up to that time is N tracks, the track division points are set so that the data after that time becomes N + 1 tracks. For track division, updating in the U-TOC sector 0 is necessary. During recording, an address as a division point is stored, and after recording, U-TOC data in the buffer RAM 13 is updated. Alternatively, the U-TOC data in the buffer RAM 13 may be updated each time.
It should be noted that the U-TOC data is actually updated on the disc 1 after the end of recording, for example, when the disc is ejected or when the power is turned off.
[0071]
When the source side is a CD player, the recording side track division point as described in FIG. 11, for example, is set by such processing. Accordingly, although the track division point may actually be slightly different from the source CD, even if a track jump or the like is performed on the CD player side, unnecessary track number information transmitted at the U bit at that time causes It is possible to prevent the recorded data from being changed track unnecessarily.
[0072]
On the other hand, if it is determined in step F103 that the source side is a mini-disc player, if a change in track number is detected during recording, the process proceeds to step F106, that is, the change in the track number in the U bit. Simultaneously with the detection, the recording address at that time is processed as a track division point. In other words, as shown in FIG. 11E, the recording-side mini-disc is also track-changed at the same point as the source-side mini-disc, and the same disc is created including the track division point. It becomes possible.
[0073]
In the case of a mini disc, the track number information in the U bit is generated by the controller of the mini disc player on the transmitting side, so that unnecessary track number information is transmitted even if the source side performs a track jump. There is no. For this reason, even when a certain piece of music in the disc is selected and dubbed instead of the entire disc, the recording side disc can be in the same state as the source side disc for each song.
[0074]
As described above, in this embodiment, when a master disk used for some purpose is manufactured using one mini disk, the user wants to manufacture a disk used for actual use by duplicating the disk. The disc having the same contents including the track change point can be created by the dubbing operation.
[0075]
In the processing of FIG. 2, when the source side is a CD player, the continuity and the audio level are monitored after the change of the track number. However, a processing example in which the continuity is not monitored is also conceivable. .
Further, the processing as shown in FIG. 2 is executed at the time of recording operation for data transmitted by the digital audio interface. However, by configuring connection means for transmitting at least control data, analog processing is performed. The present invention can also be applied when recording an audio signal input as a signal.
[0076]
In the embodiment, the present invention is applied to the recording / reproducing apparatus. However, a recording-only apparatus may be used. Further, the present invention can be applied to a recording apparatus corresponding to various tape-shaped recording media such as various rewritable optical disks and magnetic tapes as well as a recording apparatus corresponding to a magneto-optical disk, particularly a mini disk.
[0077]
【The invention's effect】
As described above, the recording apparatus of the present invention discriminates the source-side device during the dubbing operation, and if it is the first type device, it monitors the track information in the transmitted control data and records the recorded data. Track update processing is performed. On the other hand, in the case of the second type device, in addition to track information, the audio data level, the continuity of the audio data, etc. are monitored, and the track update processing is performed on the recorded data I am doing so. For this reason, it is possible to create a recording medium having the same recording state including the track change point for the dubbing operation from the first type device, and the dubbing operation from the second type device is incorrect. There is an effect that unnecessary track change processing based on transmission of track information can be prevented.
[Brief description of the drawings]
FIG. 1 is a block diagram of a recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart of track number update processing according to the embodiment.
FIG. 3 is an explanatory diagram of a U-TOC sector 0 of the minidisk system.
FIG. 4 is an explanatory diagram of a link form of a U-TOC sector 0 of the minidisk system.
FIG. 5 is an explanatory diagram of a subcode.
FIG. 6 is an explanatory diagram of a frame structure of a CD.
FIG. 7 is an explanatory diagram of CD sub-coding.
FIG. 8 is an explanatory diagram of a digital audio interface format.
FIG. 9 is an explanatory diagram of C-bit data of the digital audio interface.
FIG. 10 is an explanatory diagram of U-bit data of a digital audio interface.
FIG. 11 is an explanatory diagram of track change points of a conventional example and an example.
[Explanation of symbols]
1 Magneto-optical disk
3 Optical head
6a Magnetic head
8,14 Encoding / decoding part
11 System controller
12 Memory controller
13 Buffer RAM
21 Digital audio interface
22 Audio level detector
23 terminals

Claims (4)

Track information which is set in the device corresponding to the playback audio signal and whose transmission is suppressed during a predetermined operation is read from the recording medium together with the playback audio data and the first type device which is transmitted together with the playback audio signal. In a recording apparatus that records input audio data on a recording medium that can be connected to a second type of device that is read and transmitted from the recording medium even when the track information transmitted in a predetermined operation is,
An input means for inputting a digital audio data string including an identifier representing a model type of a transmission source, audio data, and track information corresponding to the audio data;
Type discriminating means for discriminating whether the transmission source is the first type device or the second type device based on the identifier indicating the model type of the transmission source input to the input means;
Track information detection means for detecting changes in track information based on track information corresponding to audio data input to the input means;
Level detection means for detecting the level of audio data input to the input means;
Time information discriminating means for discriminating the continuity of the time information corresponding to the input audio data included in the digital audio data string transmitted from the second type device;
When the transmission source is determined to be the first type device by the type determination unit, the track information on the recording side is changed based on the change of the track information detected by the track information detection unit, and the type When the discriminating unit determines that the transmission source is the second type device, the track information detecting unit detects a change in the track information, and then the audio input to the input unit by the level detecting unit Based on detecting that the level of data has become a predetermined value or more and detecting that the time information discriminating means maintains the continuity of time information immediately before the level has become a predetermined value or more. Control means for controlling to change the track information on the recording side;
A recording apparatus comprising:   The recording according to claim 1, wherein the track information of the first type device changes before the level detection means detects that the level of the audio data input to the input means exceeds a predetermined value. apparatus. A first device that tracks information transmission is suppressed during Rutotomoni predetermined operation is set inside the apparatus in response to the reproduced audio data is transmitted together with the reproduced audio data is read out from the recording medium together with the playback audio data In a recording method for recording input audio data on a recording medium that can be connected to a second device that is read and transmitted from the recording medium even when the track information to be transmitted is in a predetermined operation,
An input step in which a digital audio data string including an identifier representing a model type of a transmission source, audio data, and track information corresponding to the audio data is input;
Based on the identifier representing the model type of the transmission source of the digital audio data sequence including the input identifier representing the model type of the transmission source, audio data, and track information corresponding to the audio data, the transmission source is the first type device A type determining step for determining whether the device is a second type device,
A level detection step for detecting the level of the audio data input in the input step;
When the transmission source is determined to be the first type device in the type determination step, the change in the track information is detected based on the track information corresponding to the input audio data, and the detected track information is changed. Changing the track information on the recording side based on,
When the transmission source is determined to be the second type device in the type determination step, the change in the track information is detected based on the track information corresponding to the input audio data, and then the audio is detected in the level detection step. The continuity of time information corresponding to the audio data included in the inputted audio data string immediately before the level of the data exceeds a predetermined value is detected and the level of the data exceeds the predetermined value is maintained. And a step of changing the track information on the recording side when it is detected . 4. The recording according to claim 3, wherein the track information of the first type device changes before the level detection step detects that the level of the audio data input to the input step exceeds a predetermined value. Method.

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