JP3061323B2 - Recording / reproduction control circuit of disk recording / reproduction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recording and reproducing information on and from an optical disk, and more particularly to a circuit for controlling a memory when a recording state is changed to a stop or pause state.

[0002]

2. Description of the Related Art Nikkei Electronics December 9, 1991, pages 155 to 168, published by Nikkei McGraw-Hill Company.
The page discloses a new audio system called a mini-disc system entitled "Starting to commercialize mini-discs, pursuing the preceding DCC".

[0003] In this mini-disc system, at the time of recording, an audio signal for about 2 seconds of two channels on the left and right is digitized and then data compression is performed. The compressed data generated thereby is stored in a memory, and recording on a disk is performed at a timing when a predetermined recording unit (one cluster) is stored in the memory. As described above, the recording operation on the disk is performed at the timing when the compressed data of the recording unit is stored in the memory, and thus is intermittent.

According to the recording method using such a memory, the recording operation on the disk is intermittent. Therefore, even if a recording error occurs on the disk, the recording operation must be performed before the next recording operation is performed. The operation can be controlled so as to prevent interruption of the recording data. Further, at the time of reproduction, it is possible to control to perform re-reproduction even if a reproduction error occurs, so that interruption of reproduced sound can be prevented.

[0005]

In the above-described recording method, when recording is stopped or pause is set,
In the memory, there is audio data that has not been recorded on the disk and is stored before the setting. Data is recorded on the disk in units of one cluster as described above. If audio data for the unit is not stored in the memory at the time of the above setting, recording on the disk cannot be performed, and unrecorded data cannot be recorded. The system is stopped without recording the audio data.

The present invention has been made in view of the above problems, and provides a recording apparatus for recording unrecorded audio data existing in a memory at the time of recording stop or pause setting on a disk. It is an object of the present invention to provide a reproducing apparatus for reproducing audio data recorded on a disk by the apparatus.

[0007]

According to the present invention, there is provided a mute means for muting input audio data when a recording stop is set during recording, and a mute command means for operating the mute means in conjunction with the setting of the recording stop. The first feature is that the recording means includes recording inhibiting means for inhibiting the recording means from recording the recording compressed audio data after the recording compressed audio data of the recording unit including the mute audio information.

[0008] Further, in conjunction with the setting of the recording stop or the recording pause during recording, the recording means records the recording compressed audio data after the recording compressed audio data of the recording unit including the audio information at the time of the setting. Means for prohibiting recording,
Editing data generating means for detecting a block position of the compressed audio data for recording corresponding to the setting, and multiplexing the edited data output from the edited data generating means with the compressed audio data for recording of the corresponding intermittent recording track; Data multiplexing means for supplying to the recording means.
Edit data detection means for detecting edit data from reproduction data from a disc; storage data restriction means for restricting storage of compressed audio data for reproduction in the memory in accordance with the edit data detected by the edit data detection means; Is a second feature.

[0009]

When recording is stopped or a recording pause is set during recording, recording audio data stored in the memory and not recorded on the disk can be recorded on the disk. Further, valid data and invalid data within a predetermined recording unit can be identified, and only valid data can be reproduced.

[0010]

An embodiment of the present invention will be described below.
FIG. 1 is a functional block diagram illustrating a schematic configuration at the time of recording according to the present embodiment. In the following description, first, a normal recording operation of this system is performed based on FIG. First, at the time of recording, an audio signal of two channels is sampled by an A / D converter included in the audio input means 1 at the same clock frequency as that of the compact disc, and converted into input audio data. The input audio data is supplied to the data compression means 3a and is compressed to a data amount of about 1/5. Then, the data is supplied to the data storage and reading means 4 as compressed audio data for input in units of sound groups (424 bytes).

The data storage / readout means 4 stores the input compressed audio data in the memory M in units of the sound groups in accordance with the storage address generated by the storage address generation circuit 40.
To memorize. The data storage / reading means 4 further includes a read address generation circuit 42 and a data amount detection circuit 41. The data amount detection circuit 41 determines the difference between the output of the storage address generation circuit 40 and the output of the read address generation circuit 42 in the memory. The data amount of M is detected. Data amount detecting means 41
Is supplied to the recording command means 81 constituted by software in the system controller 8. When the output of the data amount detection circuit 41 is one cluster as described above, the recording command unit 81 sends a recording command to the search unit 6. Then, the search means 6 reads the read address generation circuit 4
2 is supplied with a recording data read command. as a result,
Reading of one cluster of recording audio data from the memory M is started, and the read data is sent to the recording unit 5a. The search means 6 also instructs the recording means 5a to start a recording operation, and the transmitted 1
The recording audio data for the cluster is stored in the CD in the recording means 5a.
-After a predetermined encoding process is performed by a ROM encoder and a CD-DA encoder, the encoded data is supplied to a recording magnetic head and recorded on a disk. Normal recording is performed by repeating such an operation.

Next, the reproducing operation of this embodiment will be described with reference to FIG. In the case of the present embodiment, the reproduction of the recorded data of the disk is executed by the reproducing means 5b in units of two sectors. Explaining a unit called a sector, one sector corresponds to 11 sound groups as compared with the above sound group, and one cluster corresponds to 36 sectors as compared to the cluster. As described above, the reproducing means 5b reproduces the recorded data of the disk in units of the two sectors, and reproduces the reproduced data in the CD in the reproducing means 5b.
-Decoding is sequentially performed by the ROM decoder and the CD-DA decoder. The audio data for reproduction generated from such processing is input to the data storage and reading means 4. The audio data for reproduction is input to the data storage and reading means 4, and the storage address generating circuit 40 generates a storage address, and stores the audio data for reproduction in the memory M according to the generated storage address.

The audio data for reproduction stored in the memory M is sequentially read as compressed audio data for output in sound group units according to the read address generated by the read address generation circuit 42. Then, the data decompression means 3
b, the data is decompressed, then sent to the audio output means 2, converted to analog by the D / A converter included in the audio output means 2, and then emitted by a speaker or the like.

The reading of data from the disk by the reproducing means 5b is performed at the timing described below. As described above, the data amount detection circuit 41 supplies the data amount stored in the memory M to the reproduction command means 82 in the system controller 8. When the free space of the memory M becomes equal to or more than two sectors, which is the unit of reading from the disk, the reproduction command means 82 searches the search means 6
Sends a reproduction command to the device. Then, the search means 6 instructs the reproduction means 5b to perform a reproduction operation, and the reproduction means 5b reproduces the data of the two sectors from the disk as described above. By repeating such operations, normal reproduction is performed.

Although the above-described recording and reproducing operations are not entirely known, they have a normal configuration as an MD system. The features of this embodiment are as follows. That is, the recording is not immediately stopped when the stop or pause is set during the recording, but after the data stored in the memory M and not recorded on the disk is recorded on the disk, the system is stopped or put into a pause state. Two examples will be described below as such a recording method.

First, a first embodiment will be described with reference to FIG. The operator operated the stop key included in the operation unit 9 during the recording operation of the system. In a normal system, the power supply is stopped immediately after the operation of the stop key, but in the present invention, the power supply is not stopped immediately. The recording command means 81 and the mute command means 80 which are constituted by software in the system controller 8 detect the key operation. Mute command means 80
When the key operation is detected, a mute command is issued to the mute means 7. As a result, the mute unit 7 sets the input audio data input from the audio input unit 1 to the 0 level. After the key operation, the storage of the input compressed voice data in the memory M is continued, and the muted data follows the input compressed voice data stored in the memory M before the key operation. And stored in the memory M. When the key operation is performed, the amount of data in the memory M is smaller than one cluster, but since the muted input audio data is continuously stored, the data amount gradually approaches one cluster.

On the other hand, the recording command means 81 inputs the output of the data amount detecting means 41, that is, the data amount of the memory M, and constantly monitors the data amount. Then, when the data amount becomes one cluster as described above, a recording command is sent to the search means 6. As a result, search means 6 issues a read command to read address generating means 42, and read address generating means 42 generates a read address. Then, the storage data of one cluster including the mute audio data of the memory M is supplied to the recording means 5a as audio data for recording, and is recorded on the disk. After the stop key is operated, the recording command means 81 sends a recording command for recording data of one cluster including mute audio data only once. After such a recording process, the power supply of the system is turned off and the system is stopped.

After the stop key is operated as described above, the power supply is not stopped immediately, but is stored in the memory M.
When mute audio data is added to the audio data stored in the disk and one cluster of data is formed, a recording operation is performed on the disk, so that all data not recorded on the disk can be recorded on the disk. After the recording was stopped, the recording key included in the operation unit 9 was operated again to restart the recording. Then, the audio signal input to the audio input unit 1 is stored in the memory M by the data recording / reading unit 4 after the above processing is performed in the data compression unit 3a. The recording address generation circuit 40 and the read address generation circuit 42 have been reset due to the above-mentioned stop of recording, and are set again when the recording is restarted, and both the storage address and the read address indicate the initial address.
Therefore, the input compressed data generated by the data compression unit 3a is stored from the initial address indicated by the storage address.

As described above, in the present embodiment, when recording is resumed after recording is stopped, data of one cluster is formed only by audio data input after recording is resumed. As another method, when the recording is stopped, the above-described mute audio data is added to form the recording data of one cluster to read out the recording data from the disk, and the recording can be resumed from the portion where the mute audio data is recorded.
However, this method has a problem that it is difficult to manage data on the disk and search for the data, and the present embodiment employs the above-described recording restart method.

Next, a second embodiment will be described with reference to FIG. First, the structure of recording data of one cluster, which is a unit of recording on a disk, will be described with reference to FIG. FIG.
As described above, one cluster of data, which is a unit of recording on the disk of this embodiment, is composed of a total of 36 sectors including a link sector of 3 sectors, a control sector of 1 sector, and a sector for compressed audio data of 32 sectors. The compressed audio data sector stores compressed audio data as the name implies. The link sector is a CD-DA included in the recording means 5a.
This is a margin area for preventing data overflow caused by the interleave processing by the encoder. The control sector records an effective sector and a sound group number in control data at the time of reproduction, as described later.

As in the above description, the stop key included in the operation unit 9 was operated during recording. In this case as well, the system does not stop immediately, and the storage of the recording audio data in the memory M is continued until one cluster of data is stored in the memory M. When detecting that the stop key has been input, the editing data creating means 10 inputs the data amount of the memory M from the data amount detecting means 41. The data stored in the memory M at this time is valid data and must be reproduced at the time of reproduction. On the other hand, the recording audio data input after the stop key operation is invalid data and should not be reproduced during reproduction. In the present embodiment, one cluster of data as a recording unit is formed by adding invalid data after valid data, and the data is recorded on a disk. Control data that can identify valid data is created and multiplexed in the control sector of this recording unit. At the time of reproduction, reproduction based on the control data is performed.

For this purpose, the editing data creating means 10 receives the output of the data amount detecting means 41 at the time of the key operation as described above, and detects the sector and the sound group in which the valid data is stored from the data amount. As can be seen from FIG. 5, one cluster has 32 sectors for compressed audio data, and there are 5.5 sound groups in that sector. Therefore, from the output of the data amount detecting means 41, the edited data creating means 10 detects in which sector or sound group the valid data is stored. Since one sector is 2332 bytes and one sound group is 424 bytes, the last sector and sound group in which the valid data is stored can be easily calculated. The number information of the last valid sector and sound group detected in this way is sent to the data multiplexing means 50 as multiplexed data to be multiplexed on the intermittent track.

The data multiplexing means 50 multiplexes the multiplexed data into control sectors as shown in FIG. FIG. 5 shows an example of data multiplexed on the control data. The first bit, B1, indicates whether all sectors in the cluster are valid. If 0, all sectors are valid, and if 1, all sectors are invalid. The next 5 bits B2 to B6 indicate the number of the last valid sector. Storing compressed audio data in one cluster of data requires 5 bits since there are 32 sectors. The last three bits B7 to B9 indicate a valid sound group. Since one sector has 5.5 sound groups, three bits are required. The block described in claim 2 means a sound group in this embodiment.

In this embodiment, even if the stop key or the pause key is operated, the stop or pause state is not immediately established. That is, the storage is continued until the storage amount of the compressed audio data in the memory M becomes one cluster. When the recording command unit 81 detects that one cluster of data has been stored, the recording command unit 81 sends a recording command to the search unit 6. Then, the search means 6 sends a read command to the read address generating means 42, and one cluster of recording audio data is supplied from the memory M to the recording means 5a. The data multiplexing means 50 multiplexes an effective sector and a sound group data number at the position of the control sector with respect to the supplied recording audio data of one cluster. Then, the CD-R shown in FIG.
After a predetermined encoding process is performed by the OM encoder 51 and the CD-DA encoder 52, the recording head 53
And recorded on the disk as one cluster of recording data. After such processing, the recording operation ends. If the stop key is operated, then the power supply is deactivated. When the pause key is operated, the power may be turned off in consideration of the reduction in power consumption. However, the power may not be turned off in consideration of the responsiveness after resuming recording.

In the example described above, the recording operation is not stopped immediately after the stop key or the pause key is operated, but the recording operation is performed on the disk when the input compressed data of one cluster is stored in the memory M. It was decided to stop later. However, the data stored in the memory M after the operation of the key during recording is invalid data that is not reproduced during reproduction. Therefore, any data may be recorded in the invalid data range. Therefore,
The storage of data in the memory M is stopped immediately after the operation of the key, and dummy data can be stored in an invalid data range.

Next, an example of reproducing recorded data obtained by multiplexing such valid sector and sound group data will be described with reference to FIG. A reproduction key included in the operation unit 9 is operated to reproduce data recorded on the disc. The reproduction command means 83 which has detected the operation of the reproduction key sends a reproduction command to the search means 6. Then, the search means 6 causes the reproducing means 5b to read data from the disk, and also sends a storage command to the storage address generating means 40. As a result, the optical pickup 54 of FIG.
Thus, data is read from desired intermittent tracks of the disk in units of two sectors. After the decoding process is performed by the CD-DA decoder 55, the control data recorded in the control sector is detected by the edit data detecting means 11. As described above, the valid sector and sound group data are written in the control data, and the edit data detection means 11 outputs the result to the search means 6 when detecting it. The search means 6 specifies a valid data range based on the data.

If the first bit of the control data is 0, the reproduction of the one cluster normally repeats reading of data every two sectors, and all the data of the one cluster are stored in the memory M. However, if the bit is 1, there is an invalid sector in that one cluster, so the edit data detecting means 11 obtains the last number of the valid sector and sound group, and retrieves it from the search means 6.
To send to. Then, the search means 6 performs control so that only valid sound groups are stored in the memory M.
For example, as shown in the example of FIG. 5, the last number of the valid sector obtained from the data is 3, and the last number of the valid sound group is 4. In this case, when the last number of valid data is detected by the edit data detecting means 11 as described above, the search means 6 specifies a valid data range as described above. First, since the first two sectors are valid data ranges, the reproduction data is normally stored in the memory M.

However, in the reproduction of the next two sectors, up to the fourth sound group of the first sector is valid, so that two sectors are normally read from the disk.
When all valid sound groups are stored in the memory M by the search means 6, the address generation of the storage address generation means 40 is stopped, and data in an invalid range is restricted from being stored in the memory M. By such processing,
Only the sound data for reproduction of the valid sound group is stored in the memory M, and invalid sound data for reproduction is not stored. Therefore, data expansion by the data expansion unit 3b and audio output by the audio output unit 2 are performed only for valid data. Note that the edit data is data relating to the block position of the compressed audio data at the time when the recording is stopped or the recording pause is set during the recording, and is multiplexed with the compressed audio data for recording of the intermittent recording track and multiplexed to the recording means 5a. Refers to the data supplied.

[0029]

According to the present invention, when recording is stopped or a recording pause is set during recording, recording audio data that has been recorded in the memory and has not been recorded on the disk can be recorded on the disk, thereby preventing loss of recorded audio. . Further, valid data and invalid data within a predetermined recording unit can be identified, and only valid data can be reproduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating one embodiment of a recording operation of the present invention.

FIG. 2 is a diagram illustrating an embodiment of a recording operation according to the present invention.

FIG. 3 is a diagram illustrating one embodiment of a reproducing operation of the present invention.

FIG. 4 is a detailed diagram of means for performing a recording and reproducing operation according to the present invention.

FIG. 5 is a diagram illustrating a format of recording data according to the present invention.

[Explanation of symbols]

 M memory 4 storage reading means 7 muting means 8 system controller 10 editing data creating means 11 editing data detecting means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nagatoshi Sugihara 2-18-18 Keihanhondori, Moriguchi City, Osaka Prefecture Inside Sanyo Electric Co., Ltd. (72) Inventor Masato Fuuma 2-18-18 Keihanhondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Inventor Takao Inoue 2--18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (56) References JP-A-2-216673 (JP, A) JP-A-4 −105274 (JP, A)

Claims (3)

(57) [Claims] 1. A data compression means for compressing input voice data obtained from a voice input means to generate compressed voice data for input, and sequentially storing the compressed voice data for input in a memory, and storing the compressed voice data in the memory. Data storage and reading means for reading out the recording audio data for the recording unit at a high speed, and recording means for intermittently recording the recording audio data on the disk for each recording unit. Mute sound to use unrecorded audio data as a recording unit
Mute means for generating voice information; mute command means for operating the mute means in conjunction with the setting of recording stop; and recording after the recording compressed audio data of a recording unit including mute audio information for the recording means. Control means for prohibiting recording of compressed audio data for use in a recording apparatus for a disk recording apparatus. 2. A data compression unit for compressing input audio data obtained from an audio input unit to generate compressed audio data for input, and sequentially storing the compressed audio data for input in a memory in a predetermined block unit. Data storage and reading means for reading out the recording audio data for the recording unit stored in the memory at high speed; and recording means for intermittently recording the recording audio data on the disk for each recording unit. In the disc recording apparatus, in conjunction with the setting of the recording stop or the recording pause, recording of the recording compressed audio data after the recording compressed audio data of the recording unit including the audio information at the time of the setting is performed on the recording means. A recording prohibiting unit for prohibiting the recording; an editing data creating unit for detecting a block position of the compressed audio data for recording corresponding to the setting; A recording control circuit for a disk recording apparatus, comprising: data multiplexing means for multiplexing the edited data output from the creating means with the compressed audio data for recording of the corresponding intermittent recording track and supplying the data to the recording means. 3. A reproducing means for intermittently reproducing reproduction audio data from a disk; a data storage and reading means for storing the reproduction audio data in a memory at a high speed and sequentially reading out compressed audio data for output in predetermined block units; And data expansion means for inputting the output compressed audio data and expanding the output audio data to the audio output means. A disk playback apparatus comprising: an editing data detection unit for detecting; and a storage data limiting unit for limiting storage of compressed audio data for playback in the memory in accordance with the editing data detected by the editing data detection unit. The playback control circuit of the device.