JPH05101611A - Editing data recording or reproducing circuit - Google Patents

Abstract

PURPOSE:To edit a disk record, where a time base compressed audio signal of a prescribed number of blocks is recorded with one intermitent recording track as the unit in the time base compressed state, with one block as the unit. CONSTITUTION:When a normally open editing switch S2 is closed at the time of editing operation, the number of the intermitent recording track where compressed audio data led from a compressed data memory 4 is included and the subcode frame number are generated as editing data in an editing data detecting means 16 at each timing of the start and the end of closing and is stored in an editing data memory 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edit data recording / reproducing circuit effective for use in a disk recorder or player for time-sequentially recording and recording an audio signal.

[0002]

2. Description of the Related Art In the case of a digital audio tape recorder, there are two types of methods for partially cutting a program.

The first method is a method of re-recording meaningless data in a portion to be erased, and meaningless reproduced data is muted and erased during reproduction. The second method is a method of re-recording the skip ID signal in the sub-code area of the erasing start recording track and re-recording the start ID signal in the sub-code area of the erasing end track.
At the time of reproduction, from the skip ID to the start ID, reproduction is interrupted and fast-forwarding is performed.

[0004]

The first conventional example described above.
In the method (1), the cut portion is completely erased, so that the cut portion is permanently difficult to restore. However, in the second method, the cut portion can be restored by rewriting the ID signal in the subcode area. However, the second method is to re-record only the ID signal in the sub-code area formed on the extension line of the main area. The margin area must be formed between the sub-code area and the main area in addition to the margin area of the disk. In the middle margin area, intermittent recording tracks are formed in the disk record for high density recording. Will be a major obstacle.

Further, in the case of a digital audio tape recorder, since the amount of audio information recorded on one recording track is small, there is no problem even if the editing data is made to correspond to each recording track unit. However, dividing the audio information at short intervals and providing margin areas on both sides of the audio information also becomes an obstacle when forming high-density recording by forming intermittent recording tracks on the disk record. Therefore,
It is necessary to set a large recording unit and reduce the margin area. However, when the recording unit is set to be large, if the editing data is made to correspond to each recording unit, fine editing becomes difficult.

Therefore, the recording unit of the audio data is set large without any margin area between the audio data and the corresponding editing data for high density recording, and the editing data is finer than the recording unit during editing. It is necessary to manage each block to enable re-recording.

[0007]

SUMMARY OF THE INVENTION The present invention is a disc recorder or player for intermittently recording a large amount of compressed audio data in units of a predetermined number of blocks to reproduce a disc record forming a continuous recording track. The feature on the recording side is that the edited data managed in block units is re-recorded on the corresponding intermittent recording track together with the playback compressed audio data.The edited data is detected during playback and the playback compressed audio data is stored in the compressed data memory. Limitation is a feature of the playback side.

[0008]

According to the present invention, therefore, editing is finely managed in block units, editing data is re-recorded in units of intermittent recording tracks together with reproduced compressed audio data of the corresponding intermittent recording tracks, and reproduced editing data is compressed data. It is used to control the storage of playback compressed audio data in the memory.

[0009]

The present invention will be described below with reference to the illustrated embodiments.

In this embodiment, the voice data for about 2 seconds which has been compressed is compressed to about ⅕, and the compressed data together with the control data is reduced to about ¼ in units of one cluster (36 subcode frames). The present invention is applied to a disk record that is time-axis compressed, converted into CD format data, and intermittently recorded in about 0.5 seconds.

The relationship between the compressed audio data and the control data before conversion to the CD format is as shown in FIG.
The control data of one subcode frame is provided prior to the audio data S of 32 subcode frames, and the data for 36 subcode frames in a state in which both the front and rear of the data are sandwiched by link blocks of 1.5 subcode frames respectively. 1 cluster. The data of one subcode frame corresponds to 1/75 second, and the link block is CD.
It is formed to be slightly longer than the change range of the data array due to the interleaving processing when converted to the format, and is configured to be able to form the maziness area. A sync signal is provided at the head of each subcode, and the control data includes track number data in addition to edit data described later.

The recording medium of this embodiment is a small-sized magneto-optical recording medium, and the guide track is spatially FM-modulated with an ATIP code in subcode frame units in advance, as in the case of a normal-sized optical recording medium. It is formed in a meandering state. Therefore, the intermittent recording track is recorded by this ATIP
It is recorded corresponding to the code.

The reproducing operation of the disc recorder for reproducing the magneto-optical disc record recorded as described above will be described below with reference to FIG. [Playback of unedited disc] First, although not shown in the figure for the disc servo of the disc recorder, the rotation of the disc motor is controlled by phase comparison between the synchronization signal and the reference signal contained in each subcode frame. , The disk record D is rotated at a linear velocity equal to that at the time of recording. The reproduction signal intermittently reproduced from the pickup 1 for reproducing the recording track of the disc record D is the CD-DA.
It is decoded by the decoder 2 and further decoded by the CD-ROM decoder 3. The reproduction processing process described above is common to the CD player and is a well-known technique.

In the case of the present embodiment, the reproduced compressed audio data processed by the CD-ROM decoder 3 is supplied to the compressed data memory 4. The compressed data memory 4 selectively stores only the reproduced compressed audio data of the desired recording track according to the write address generated by the write address generating means 12 that counts the high speed clock FC. The write address generated by the write address means 12 is controlled by the write address generation control means 11. The write address generation control means 11 outputs the reproduction control data only when the desired track number data is input from the CD-DA decoder 2 while the standby release command signal is being output from the storage capacity detection means 14. The write address generating means 12 is controlled in a driving state in synchronism with the generation of reproduced voice data including the data.

When the amount of data stored in the compressed data memory 4 becomes less than a certain amount, the above-mentioned storage amount detecting means 14 creates an empty area in which the reproduced compressed audio data of the next intermittent recording track can be stored. Then, the standby release command signal is supplied to the pickup access means 10. The pickup access means 10 reproduces and scans one recording unit of the intermittent recording track, and then continuously reproduces the leading part of the next intermittent recording track, and the edit data in the control data of the subsequent intermittent recording track is sent to the edit data detecting means 15. When the compressed audio data to be reproduced is detected in advance, it returns to the preceding link lock of the corresponding intermittent recording track and enters the reproduction standby state and repeats the track jump to enter the reproduction standby state. When the standby release command signal is input in the reproduction standby state, the reproduction standby state is ended and the corresponding intermittent recording track is reproduced.

The reproduced compressed audio data stored together with the reproduction control data in the compressed data memory 4 in accordance with the write address, only the audio data are sequentially reproduced in accordance with the read address generated by the read address generating means 13 which receives the low speed clock as a count input. It is read out and supplied to the data expansion means 5.
The data decompression means 5 decompresses the compressed data as it is to form audio data. Decompressed audio data is DA
The voice monitor 8 is converted into an analog signal by the conversion means 7.
Is supplied to. [Editing Operation] With the above-described configuration, in this embodiment, editing can be performed in subcode frame units. That is, when there is a voice to be cut in the above reproduction state, the normally-open editing switch S2 is closed immediately before the timing of the voice generation. An erasing start command is issued from the system controller 18 in conjunction with this closed circuit. The edit data forming means 16 is executed at the timing of generation of this erase start command.
Inputs the track number data, the read address and the write address, and detects the track number and the position data of the subcode frame when the erase start command is generated. This position data is stored in the edit data memory 17. Similarly, when the closing of the edit switch S2 is completed at the timing when erasing is desired to be completed, an erasing end command is generated from the syscon means 18, position data is formed and derived from the edit data forming means 16 and stored in the edit data memory 17. It Therefore, the edit data memory stores the erase start track number and the subcode frame number, and the erase end track number and the subcode frame number as a pair as edit data. It should be noted that this editing operation can be executed at a plurality of positions in the program, and all corresponding editing data is stored in the editing data memory 17. Further, the syscon means 18 also supplies an erase start command and an erase end command to the switching means 6, and the switching means 6 sends the audio data through the low pass filter 9 only during the closing period of the edit switch S2. The high-frequency-limited data is selectively derived instead of normal voice data. Therefore, during the operation period of the edit switch S2, the sound is band-limited and monitored. [Recording of Edited Data] Next, the edit data recording mode will be described with reference to FIGS. In this edit data recording mode, the edit data in the edit data memory 17 is sequentially supplied to the edit data recording control means 18. When the edit data is input, the edit data recording control means 18 first inputs the track number data of the erase start to the pickup access means 10. As a result, the pickup access means 10 causes the erase start track number data and the D
The pickup 1 is made to access the intermittent recording track where the editing data is to be re-recorded by comparing with the reproduction track number data derived from the C-DA decoder. At the start of reproduction immediately after the access is completed, the write address generation control means 11 detects that the reproduction track number data matches the erasing start track number data, and the reproduced compressed audio data is stored in the compressed data memory 4. The write address generating means 12 is controlled so that As a result, reproduced compressed audio data for one intermittent recording track is stored in the compressed data memory. The pickup access means 10 reproduces an intermittently recorded track for one cluster, then returns to the original track start end link block and repeats a track jump to enter a recording standby state.

In this recording standby state, the editing data recording control means 18 issues an editing data recording command in synchronization with the reproduction timing detection output of the link block generated by the CD-DA decoder 3 and the read address generating means 13 and the pickup 1. Supply to. As a result, the pickup 1 increases the irradiation beam intensity and enters the recording state, and the compressed data memory 4 reads the stored reproduced compressed data for one cluster. Prior to the reading of the compressed data, the edit data recording control means 18 forms edit data and supplies it to the data multiplexing means.

As shown in FIG. 3, the structure of this edit data is the first method for distributing and recording the edit data corresponding to the respective recording tracks, and the intermittent recording track for starting the erasure as shown in FIG. There are a second method of recording the editing data of the cut portion in a concentrated manner, a third method of storing the editing data common to all the intermittent recording tracks related to the editing, and the like.

First, in the case of the first method, as shown in FIG. 4, the edit data of the intermittent recording track at the start of erasure is erased with the upper two bits of data 01 indicating that the latter half subcode frame is erased. It is composed of the number of 5 bits of the starting subcode frame. Also, intermittent recording track 1
The edit data for erasing all of the main data is composed of at least upper 2 bits of data 11 indicating that all subcode frames are to be erased and 5 bits of undefined data. Further, the edit data of the intermittent recording track after the erasing is composed of upper 2 bits of data 10 indicating that the first half subcode frame is to be erased and 5 bits of the number of the subcode frame to be erased. An unedited intermittent recording track which is not erased at all is composed of 7 bits of all 0s.

As the edit data in the second and third methods, the data stored in the edit data memory as shown in FIG. 4 is used. However, it is sufficiently possible to use data indicating the erasing period instead of the edit data. As the edit data of this erasing period, a subcode frame period, a cluster period and a subcode frame period, and a time period can be used.

The edit data of any of the above-mentioned configurations is multiplexed in the data multiplexing means 19 at a predetermined position of the control data as a part of the control data. The compressed voice data with the edited data multiplexed is subjected to processing such as synchronization addition by the CD-ROM encoder 20 and then converted into recording data of a predetermined CD format by the CD-DA encoder 21.
It is supplied to the recording head 22. As a result, the recording track overheated by the irradiation beam is magnetically modulated, and the intermittent recording track is re-recorded.

With respect to the edit data of the first method and the third method, re-recording in units of intermittent recording tracks is repeated in the above-described manner, and as a result, the intermittent recording tracks of the editing portion are edited. Are multiplexed and all are rewritten. Further, in the second method, only the intermittent recording track at the start of erasing is rewritten. [Reproduction of Edited Disc] The operation in the case of reproducing a disc record in which edit data is multiplex-rerecorded will be described below with reference to FIG.

First, when the edited disc on which the edited data shown in FIG. 3 is recorded is reproduced, the intermittent recording track on which the edited data is not rerecorded is reproduced by the same procedure as the reproduction of the unedited disc described above. Is done.

However, the pickup 1 reproduces the beginning portion of the intermittent recording track immediately following the intermittent reproduction,
When the edit data detecting means 15 detects the edit data of erasing start in the control data, the pickup access means 10
Enters the playback standby state in the link block of the recording track. The detected edit data is input to the write address generation control means 11. The write address generation control means 11 specifies the reproduction compressed audio data storage range based on the edited data.

Then, when the standby release command signal is generated from the storage amount detecting means 14, the pickup access means 10
Cancels the reproduction standby and starts the reproduction of the intermittent recording track. The write address generation control means 11 synchronizes with the generation timing of the reproduction compressed audio data after detecting the track number data generated by the reproduction start, and stores the reproduction compressed audio data until the erasing start in order to store the reproduction compressed audio data. To control. As a result, only the desired audio data is stored in the compressed data memory 4.

After the pickup 1 reproduces the corresponding intermittent recording track, the head portion of the succeeding intermittent recording track is continuously reproduced, and the edit data in the control data is detected by the edit data detecting means 15, and the edit data is detected. When it is recognized that all subcodes are invalid, the supply of the reproduction standby command to the pickup access means 9 is stopped. As a result, the pickup access means 9 returns to the start of the corresponding intermittent recording and rack and continues reproduction scanning without continuing reproduction standby, and continuously reproduces subsequent intermittent recording and rack. The edit data in the resulting reproduction control data is detected by the edit data detecting means 15, and the generation of the reproduction standby command is blocked until the edit data for erasing cancellation is detected. As a result, the pickup 1 performs continuous reproduction at a stretch up to the intermittent recording track on which the edit data for erasure cancellation is recorded, and enters the reproduction standby state at the beginning of the intermittent recording track to repeat the track jump. At the same time, the edit data detected by the edit data detection means 10 is input to the write address generation control means 11. The write address generation control means 11 specifies the reproduction compressed audio data storage range based on the edited data.

Next, when the standby release command signal is generated from the storage amount detecting means 14, the pickup access means 10
Cancels the reproduction standby and starts the reproduction of the intermittent recording track. The write address generation control means 11 generates a write address so as to store the reproduction compressed audio data after the erasure cancellation which is delayed by a predetermined subcode frame from the generation of the reproduction compressed audio data after the track number data generated by the reproduction start is detected. Control means 12. As a result, only the desired audio data is sequentially stored in the compressed data memory 4 according to the write address.

The read address generating means 13 continuously reads the compressed audio data at a low speed regardless of the access operation of the pickup, and supplies the read data to the data decompressing means 4, so that the recording tracks are discontinuous. Regardless, the voice can be continuously supplied to the voice monitor 7.

When the standby release command signal is input from the storage amount detecting means 14 to the pickup access means 9 in the reproduction standby state, the reproduction standby state is ended and the pickup 1
Plays the corresponding intermittent recording track.

In the case of reproducing an edited disc on which the edited data is re-recorded by the second method or the third method,
When the edit data detecting means 15 detects the edit data of the intermittent recording track at the start of erasing, the erasing release track number data is supplied to the pickup accessing means 10.
The pickup access means 10 makes the pickup 1 access an erase-released track, and puts it in a reproduction standby state at the start end of the track. Further, the erasure release track number data and the erasure release subcode position data are supplied to the write address generation control means 11, and the intermittent recording track of the corresponding track number is reproduced while the standby release command signal is generated. When the compressed audio data of the corresponding sub-code frame is derived from the CD-ROM decoder 3, the write address generating means 12 supplies the write address to the compressed data memory 4 to store only the desired compressed audio data. I will do it. When the same edit data is recorded on all the intermittent recording tracks that need to be edited as in the third method, there is an advantage that the access state can be confirmed on the intermittent recording tracks in the middle. When the erase period is used as the edit data, the number of intermittent tracks, the number of subcode frames, and the time are set to the pickup access unit 1.
It is necessary to execute the access by counting 0 or the write address generating means 11.

In this embodiment, the edited data detecting means 15 can be deactivated by operating the control switch S1 even when the edited disk is reproduced. It is also possible to play the entire erased portion of the disc. Further, by performing an editing operation in this playback state and rewriting the edited data, the edited disc can be freely re-edited as many times as desired.

Further, in the present embodiment, the management unit is the subcode frame unit, but if necessary, that unit,
That is, it goes without saying that the blocks in the claims may be managed in units other than the subcode frames below the cluster.

Further, in the present embodiment, the compressed audio data is reproduced in units of the intermittent recording tracks, but the audio can be continuously monitored even in the case of a small capacity compressed data memory when the erasing period is long. For this reason, it is necessary not to create a large empty area in the compressed data memory.For that reason, if the playback unit is configured to be played back in intermittent recording units or less, for example, in subcode frame units, the cut portion will be long. However, the continuous playback time can be lengthened.

[0034]

As described above, according to the present invention, the editing of the time-axis compressed audio data of one cluster forming the intermittent recording track can be managed in units of fine blocks, and the effect is great.

[Brief description of drawings]

FIG. 1 is a block diagram of one implementation circuit of a recorder for playback and editing according to the present invention.

FIG. 2 is a recorder 1 for recording edited data according to the present invention.
It is an implementation circuit block diagram.

FIG. 3 is a data array explanatory diagram showing an example of a configuration of edit data.

FIG. 4 is a data array explanatory diagram showing another example of the configuration of edit data.

[Explanation of symbols]

 S2 edit switch 4 compressed data memory 17 edit data memory 19 data multiplexing means 11 write address generation control means 13 read address generation means

Claims (4)

[Claims] 1. Compressed audio data is time-axis compressed and recorded by using a predetermined number of blocks as a recording unit, a plurality of intermittent recording tracks are continuously formed along a guide track, and intermittently reproduced at the same linear velocity as during recording. In the disk recorder that decompresses the reproduced compressed audio data and derives the audio signal, the operating means for designating the erasing start timing and the erasing end timing, and the erasing start timing are linked with the operation of the operating means. Edited data storage means for storing the block position of the reproduced compressed audio data corresponding to the erasing end timing, and the compressed audio data of the intermittent recording track to which the block position information of the erasing start timing and the block position information of the erasing end timing respectively correspond. Data multiplexing means for multiplex recording and re-recording the output of the data multiplexing means in units of intermittent recording tracks Edit data recording circuit and recording means, comprising by arranging respectively that. 2. The edit data recording circuit according to claim 1, wherein the block is a subcode frame. 3. Compressed audio data is time-axis compressed and recorded by using a predetermined number of blocks as a recording unit, and a plurality of intermittent recording tracks are continuously formed along a guide track, and intermittently reproduced at the same linear velocity as during recording. In the disk recorder that decompresses the reproduced compressed audio data and derives the audio signal, the operating means for designating the erasing start timing and the erasing end timing, and the erasing start timing are linked with the operation of the operating means. Edit data storage means for storing the block position of the reproduced compressed audio data corresponding to the erase end timing, block position information of the erase start timing, and block position information of the erase end timing or erase period information as edit data, and the erase start or Data multiplexing means for multiplexing compressed audio data of an intermittent recording track to be erased, An edit data recording circuit comprising recording means for re-recording the output of the data multiplexing means in units of intermittent tracks. 4. A disk record in which a plurality of intermittent recording tracks are continuously formed along a guide track by time-sequentially compressing and recording compressed audio data in units of a predetermined number of blocks and edit data, the same as at the time of recording. In a disk player that reproduces reproduced compressed audio data intermittently at a linear speed and decompresses the reproduced compressed audio data to derive an audio signal, a compressed data memory for storing the reproduced compressed audio data at high speed, and the edited data from the reproduced data. An edit data detecting means for detecting, a write address generating control means for controlling storage of reproduced compressed audio data in the compressed data memory according to an output of the edit data detecting means, and a read address for the compressed data memory at a low speed. And a read address generating means for supplying the read data and the edit data reproducing circuit.