JPH02158956A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To prevent the discrimination of recording/nonrecording from being misconceived by assigning an abnormal flag to a track undiscriminable of signal kinds or a track recorded with an unreproducible signal and performing a prescribed processing at the time of recording or reproducing. CONSTITUTION:A detected envelope level of a magnetic disk 52 is compared with a preset noise level by a system controller (SC) 50, and when it is smaller than the noise level, the nonrecording is recorded to a data table (T-table) for registering data on each track, and then when a flag detecting circuit 78 and a control code detecting circuit 80 are instructed to reproduce it to find that a flag attached to a sound track is the nonrecording, this is registered to the T-table as a nonrecorded track. In the case of a track whose regenerative signal is too small to be normally reproduced or a track recorded with unrecordable or unreproducible signal by using the T-table produced in this way, an alarm display takes place for an abnormal track according to the flag of the abnormal track set up on the T-table.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording or reproducing device, and more specifically to a device having video and audio recording or reproducing functions.

[Conventional technology]

Conventionally, in this type of recording or reproducing device, when a magnetic disk as a recording medium is loaded, the recorded contents of the magnetic disk are searched, stored in the memory as a data table, and thereafter, recording is performed according to the data table. - A configuration for controlling playback operations has been proposed.

[Problem to be solved by the invention]

However, in conventional recording or reproducing devices for magnetic disks that comply with still video standards, the recorded data and
When creating a table, there are no stipulations regarding the handling method when accessing a track where the playback signal level is low even though there is a recorded signal, or where there is an unerased recorded signal due to insufficient erasing during the erasing operation. It has not been.

Furthermore, there are no regulations regarding the processing method when accessing a track in which a signal that cannot be reproduced is recorded.

Therefore, an object of the present invention is to provide a recording or reproducing device that allows the user to effectively deal with such situations.

[Means to solve the problem]

A recording or reproducing apparatus according to the present invention is a recording or reproducing apparatus that searches and stores information regarding the recorded content of a recording medium, and performs subsequent recording, reproducing, or erasing operations according to the stored content, and the recording or reproducing apparatus performs a subsequent recording, reproducing, or erasing operation according to the stored content, and is The present invention is characterized in that an abnormality flag is assigned to a track whose signal type cannot be determined because it is too small, or a track in which a signal that cannot be reproduced is recorded, and a predetermined process is performed when recording or reproducing the track.

[Effect]

By assigning the abnormality flag and issuing a predetermined warning to that track during recording or reproduction, it is possible to notify the user of the abnormality. Also,
By substantially prohibiting the recording or reproducing operation on the abnormal track, it is possible to prevent the user from mistakenly believing that the device is malfunctioning.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings. 1st A
The figure shows a block diagram of a recording system according to an embodiment of the present invention, and FIG. 1B shows a block diagram of a reproduction system.

The recording system shown in FIG. 1A will be explained. When recording a video signal, the system controller (hereinafter referred to as SC) 40 switches the switch 20 to the video (a) side, and switches the switch group 4
In response to the operation of the video signal recording switch 4, the head drive circuit 30 moves the magnetic head 31 to a designated track position on the magnetic disk 32. When the movement of the magnetic head 31 is completed, the 5C 40 instructs the video recording circuit 10 to capture the input video signal for a certain period of time. The video recording circuit 10 performs a known video recording process, and its output is as follows:
The signal is applied to the magnetic head 31 via the pre-emphasis circuit 12, the switch 20 and the FM modulation circuit 22, and is recorded on the magnetic disk 32.

When recording an audio signal, the input audio signal is subjected to noise reduction processing by the encoder 13 and sent to the oscillator 38.
According to the timing of the sampling pulse from A
The data is digitized by the /D converter 14. When the 5C40 receives an instruction to start audio recording from the switch group 44, it instructs the address counter 24 to start the audio recording from the switch group 44.
A/D according to the timing of the clock pulse of the oscillator 38 at a rate corresponding to the audio signal time axis compression rate selected in step 4.
The output data A/D converted by the converter 14 is written into the audio memory 15. If the amount of audio signals stored in the audio memory 15 exceeds the recording amount of one track on the magnetic disk 32, or if the still video for the audio signal being recorded is switched, a request to move to another track or a temporary recording operation is made. When a stop request is made, the 5C40 stops a track on the magnetic disk 32 on which no signal is recorded (hereinafter referred to as
After moving the magnetic head 31 to an empty track (referred to as an empty track), the stored data is read out from the audio memory 15 according to an address signal output by the address counter 26 in response to the oscillation clock pulse of the oscillator 39,
Convert it to an analog signal. Note that the D/A converter 1
6 performs D/A conversion according to the oscillation clock pulse of the oscillator 39.

Adder 17 adds a control code generated by control code generation circuit 28 and a flag signal generated by flag generation circuit 29 to the time-base compressed audio signal from D/A converter 16. The output of the adder 17 is
The signal is applied to the magnetic head 31 via the pre-emphasis circuit 18, the switch 20 and the FM modulation circuit 22, and is recorded on the magnetic disk 32.

Reference numeral 300 denotes an ID signal generation circuit that performs DPSK modulation with a period of 2H on the ID signal output from the 5C40 in synchronization with the horizontal and vertical synchronization signals separated from the synchronization separation circuit 301. The circuit 300 is reset by a vertical synchronization signal and includes a counter 302 that counts horizontal synchronization signals.
and modulates the ID signal in synchronization with the output of the circuit.

The audio signal is stored in the audio memory 15, and the audio signal is stored on the magnetic disk 32.
The recording operation continues until a voice recording stop request is issued or there are no recordable free tracks on the magnetic disk 32.

Next, the reproduction operation shown in FIG. 1B will be explained. Note that the display device 4
3 and switch group 44 are also used as a recording system. Video and audio are recorded on the magnetic disk 52 as described above. 5C50 positions the magnetic head 54 on a designated track on the magnetic disk 52 by the head drive circuit 96. The magnetic disk 52 is rotated at a predetermined speed and with a predetermined phase relationship by a known servo mechanism. magnetic head 54
The output of is amplified by a reproducing amplifier 59,
is applied to When the reproduction signal is a video signal, the output of the FM demodulation circuit 60 is applied to a de-emphasis circuit 62 with non-linear characteristics, and the output of the de-emphasis circuit 62 is reproduced by a video reproduction circuit 66. Synchronous separation circuit 9
4 separates the synchronizing signal from the output of the reproduction circuit 66 and converts it to 5C.
50.

When the reproduced signal is an audio signal, the output of the FM demodulation circuit 60 is applied to a de-emphasis circuit 68 with linear characteristics, and the output of the de-emphasis circuit 68 is applied to the A/D converter 7.
0 is applied to a time base expansion circuit consisting of an audio memory 72 and a D/A converter 74, and is also applied to a flag detection circuit 78 and a control code detection circuit 8o. Flag detection circuit 78 and control code detection circuit 80
detects the flag signal and control code and applies them to 5C50, respectively. When the timing signal generation circuit 86 confirms the detection of the flag and control code, it instructs the address counter 82 to
The output of the D converter 70 is sequentially written into the audio memory 72. Note that the A/D converter 70 performs A/D conversion according to the output clock pulse of the oscillator 90. 5C50 applies audio time axis compression rate data included in the detected control code to address counter 84.

Thereby, the data stored in the audio memory 72 is sequentially read out at a speed according to the audio time axis compression ratio data.

The output data of the audio memory 72 is converted into an analog signal by a D/A converter 74 operating under the oscillation clock pulse of an oscillator 92, and subjected to decoding and noise reduction processing by a decoder 76.

The 5C50 constantly monitors the address counters 82 and 84, and when the storage capacity of the audio memory 72 becomes low, it reproduces the recording signal of the track specified by the control code, and the next data storage location of the audio memory 72 at the current time is played back. Store the playback signal at the position.

The above operations are repeated until a stop switch of the switch group 44 issues a request to stop the playback operation, or a flag added to the recorded audio signal on the magnetic disk 52 indicates the end of the sound positience.

200 is the DP included in the signal reproduced from the head 54
ID that demodulates the SK modulated signal and outputs it to 5C50
This is a signal judgment circuit. The circuit 200 is the synchronous separation circuit 9
2 depending on horizontal and vertical synchronization signals separated by 4
Performs DPSK demodulation with a period of H. Determination circuit 200 includes a counter 201 similar to circuit 302 of FIG. 1A.

Next, the operation of creating a data table showing the recorded content of the magnetic disk 52 and the procedure for reproducing an audio sequence in the recording/reproducing apparatus having the above configuration will be explained. FIG. 2 shows the flowchart. In this embodiment, when the magnetic disk 52 is not loaded, the magnetic head 54 is
It is assumed that it is located at a reference position (home position) on the outer periphery further than the first track.

FIG. 4A shows a case where an audio signal is recorded on a track formed on a magnetic disk, that is, the format of an audio track. One audio track is divided into four sectors #0 to ##, and the format of each sector is as shown in FIG. 4B. In one sector, the start signal of the audio sector is recorded as a start flag SF at the start position, and then the time axis compression ratio of the audio signal and the video signal track address corresponding to the audio signal are recorded as a control code. If the audio signal is recorded continuously over multiple tracks,
The track address where audio recording starts and the recording track address of the next audio signal are recorded. Furthermore, when continuous audio signals are recorded on a plurality of tracks, this is considered to be one group, and hereinafter this will be referred to as one audio sequence. Also, if the recording of the audio signal is completed with only a single track, this
Let's call it a sequence.

First, the data table created in this embodiment will be briefly explained. In this embodiment, a data table (hereinafter referred to as
There are two types: a T-table) and a table (hereinafter referred to as an S-table) for registering data related to voice sequences. The format of the T-table is shown in Table 1, and the format of the S-table is shown in Table 2. However, in Table 1, the first data is 8-bit data regarding the signal recorded on the track, and the second data is 8-bit data regarding the amount of displacement from the absolute position to the optimum reproduction position.

The data in Table 2 is 8-bit data indicating the audio playback order and the audio sequence group. The audio is played sequentially in the order in which it was stored.

FIG. 2(e) shows a procedure for obtaining a reference signal for recording/non-recording determination. When the magnetic disk 54 is loaded, the 5C50 detects this and rotates the motor 56 at a predetermined speed. When a servo clock signal indicating stable rotation of the motor 56 is received from a servo circuit (not shown), the magnetic head 54 is moved to the reference position and the signal at that position is reproduced (S
47). In the case of the still video standard, this reference position may be the O or 51 track on which recording is not performed, or it may be on the outer circumferential side of the O track. In short, any position that is not recorded is sufficient. The level obtained by adding a predetermined noise margin to the size of the envelope of this reproduced signal is compared with a separately preset maximum noise level, and the smaller one is set as the noise level of the magnetic disk 52 and is set as the noise level of the magnetic disk 52. This is used as the criterion for recording (S48, 49.50). Note that the value obtained by adding a predetermined noise margin to the detection envelope level may be used as the disk noise level without comparing it with the maximum noise level, but the judgment accuracy can be improved by performing the above comparison. will improve.

Further, the magnetic head 54 is formed by integrating two sets of magnetic heads so that two adjacent tracks can be reproduced without moving the magnetic head 54.

This is intended for frame playback. Hereinafter, the outer magnetic head will be referred to as channel 1 (chi), and the inner magnetic head will be referred to as channel 2 (ch2).

5C50 performs processing as shown in FIG. 2(a).

That is, the noise level setting routine shown in FIG. 2(e) is executed to detect the noise level at the reference position of the magnetic disk 520 (S1), and the track access counter is initialized (S2). The track access counter indicates the track position on the magnetic disk 52 that is being accessed by the chi head. The 5C50 uses the CHI head as the head used (S3), moves the CHL head to the absolute position of the track indicated by the track access counter (mechanical absolute track position from the reference position) (S4), and outputs the CHL head. Detect the size of the envelope t6 (S5). The 5C50 compares the detected envelope level with the noise level (S(+)), and if it is smaller than the noise level, registers it as unrecorded in the T table (S7), and if it is larger than the noise level, For example, tracking using the mountain climbing method.
The servo is performed to move the playback head to the position where the playback signal level is maximum (optimum playback position), and the presence of recording and the amount of displacement from the absolute track position are registered in the T table (S8
).

5C50 instructs the flag detection circuit 78 and the control code detection circuit 80 to reproduce the signal at the position of the flag and audio control code that should be added to the audio signal from the signal of the portion corresponding to sector #l of the reproduction track. (S9), and it is determined from the playback result whether or not the track has an audio signal recorded thereon (SIO). If it is determined to be an audio track, the flow moves to FIG. 2(b), where the flags and control codes of each sector #0 to #3 are played back (5ll), and it is again determined whether it is an audio track or not. (S12). If it is determined that it is an audio track, then a determination is made based on the playback flag (S13). That is, if the flag added to sector #0 is type 4 (indicating unrecorded), 82 in the flow of FIG. 2(a)
Go back to the T table and register it as an unrecorded track (S7)
, sector #0 is type 1 (indicating the start of the sequence) or type 2 (indicating the continuation of the sequence) and sector #0
If sectors 1 to #3 are flagged as type 2, or if recording is performed that switches from type 2 to type 4 between sectors #1 to #3, check the playback control code and change the sequence. It is determined whether it is the start track of (S14).

If it is the first track of the sequence, register the fact that it is an audio track in the T table, and if there is a corresponding video track, its number, and then check whether there is a duplicate track number to be registered in the S table. If there is a duplicate, the registration is deleted (515), and a new track number, the fact that the track is the beginning of the sequence, and the track number following the track are registered (S16).

If it is not the first track of the sequence, register the fact that it is an audio track and the corresponding video track number in the 'F table, search the S table for the sequence position to which the audio track belongs and its track number, and then Add the audio track to the position where it should be played.

If the sequence to which the audio track belongs is not found, a new sequence is registered (SL?).

If the reproduction flag is type 3 (indicating the end of the sequence) in any of sectors #0 to #3 (S13), the reproduced audio control code is checked to determine whether it is the first track of the sequence ( 318).

In the case of the first track of the sequence (318), after registering in the T table that it is an audio track and the video track number corresponding to the audio track, check whether this audio track number has already been registered in the S table; If it has already been registered, it is deleted from the S table (519), and then the track number is newly registered along with the fact that the sequence is completed with one track (S20). If it is not the first track of the sequence (S18), after registering the fact that it is an audio track and the corresponding video track number in the T table, the position of the audio sequence to which the audio track belongs and the position within that audio sequence is determined from the S table. After finding the position, register that track as the ending track of the audio sequence. However, if the audio sequence to which it should belong is not found from the data table, an additional audio sequence is registered, and if the audio sequence to which it belongs is found but the corresponding track number is not found within that sequence. If so, the fact that the sequence ends at that track and the track number are registered in the end position of that sequence in the S table.

If it is determined that the track is not a track on which an audio signal is recorded (S10), the output of the oscillator 90 provided in the 5C50 is used to determine whether the recorded signal is a video signal or not. I is a counter that counts
A reproduction timeout timer for the D data is started (S24), and the determination circuit 200 is instructed to reproduce the ID data (S25). The reproduction of ID data in the video reproduction circuit 66 is performed in synchronization with the synchronization signal of the reproduced video signal, so when the audio signal is being reproduced, there is no equivalent to the synchronization signal of the video signal, and the ID data cannot be reproduced. Can not. 5
The C50 waits for the ID reproduction end signal from the determination circuit 200 and monitors the ID reproduction timeout timer (
S26, 27. ). If the ID playback timeout timer times out before the ID playback (S27)
, since it is determined that it is not a video signal, again,
The process moves to an audio signal processing sequence to confirm whether it is an audio track (S27-5ll). If the reproduction of the ID ends before the timeout (S27), it is a video signal, so it is determined from the reproduced ID data whether it is the outer track of the frame video (528), and if it is not the outer track. is registered as a field recording track in the T table (538), and if it is an outer track, it is registered in the T table as being on the outer circumference of the frame image (S29).

The ID playback timeout timer may be a counter outside the 5C50, for example, a counter 201 that is located in the determination circuit 200 and counts the synchronization signal of the video signal. In short, any circuit that counts the number of synchronization signals within a predetermined period of time may be used.

Then, switch the playback head to the ch2 side (S30
), 5C50 is a flag detection circuit 78 and a control circuit.
The code detection circuit 80 is instructed to reproduce the flag and voice corn troll code added to the audio signal from the reproduced signal corresponding to sector #1 (531), and from the result, it is determined whether or not it is an audio signal. (S327゜If it is determined to be an audio track <532), change the registration of the frame video outer circumferential side performed for the track corresponding to the chi head to registration of field video, and switch the used head to chi ( 838). If it is determined that it is not an audio track (S32), an ID playback timeout timer is started (S33), the video playback circuit 66 is instructed to play the ID (534), and the end of playback is waited for (S35.36). If a timeout occurs before the end of ID playback (S36), the frame/video outer circumferential registration performed for the track corresponding to the chi head is changed to field video registration, and the used head is changed to the ch
i (538). If the TD playback ends before the timeout (S35), it is checked from the played ID data whether it is the inner track of the frame video (S35).
37). If it is not on the inner side of the frame (S37), ch
Frame and
The video outer peripheral side registration is changed to field video registration, and the used head is switched to chi (S3g). If it is determined that it is on the inner side of the frame, the channel of the T table
The frame video inner circumferential side is registered in the track portion corresponding to the second head (S39).

Next, the track access counter is incremented from 840 to 542 according to the channel of the head in use.
), it is determined whether access to all tracks has been completed (S4
3). If there is a track that has not been accessed yet, the sequence from S30 is repeated until all tracks have been accessed. Then, the registered contents of the data table are searched, and the data table is operated on the missing tracks and abnormally registered tracks of the audio sequence (S4
4) Count the number of unrecorded tracks from the data table (545), switch the used playback head to chi, and complete the search operation for the recorded contents of all tracks.

The data table operation (S44) for audio sequence loss processing will be explained in detail with reference to FIG. The presence or absence of an audio track is checked using the T table created by the search operations from 81 to S43 (S51).
, if no audio track exists, the T table and S table are not manipulated.

If an audio track exists, the access counter of the S table is initialized 552), and the audio track number is read from the table indicated by the access counter (S53). It is checked whether the read track number actually exists (554), and if it exists, T
Read the data of the track from the table (S55
). Then, it is determined whether it is unrecorded or not (856), and if it is recorded, it is determined whether or not it is audio (356-1).
). If it is audio, check whether it is the beginning of the audio sequence by referring to the data in the S table (S57), and if it is the beginning, S
Whether it is the start data of the table (S61), if it is not the start of the S table, it is determined whether the data before the currently referenced data in the S table is the end track of the sequence (562), and it is determined that it is not the end track. If so, a flag indicating the end of the sequence is set for that data (S63).

Next, the presence or absence of a corresponding video track is checked from the data read from the T table (S64), and if a corresponding video exists, the first track of the audio sequence corresponds to that video track data in the T table. A flag indicating this is set (S65). If it is not the beginning of the audio sequence (S57), it is determined whether it is the last track of the audio sequence (558), and if it is not the last track, there is a track following the currently referenced track in that sequence. If it does not exist, a flag indicating the end of the sequence is set in the currently referenced data in the S table (S60).

If it is determined that it is not an audio track (S56-1),
The corresponding data in the T table is re-registered as an abnormal track (S69). If the track number registered in the S table does not exist (S54) or if it is determined that the track is an unrecorded track (856), the registered data in the S table is checked and error processing is performed. It is checked whether the registered data in the S table is the first track of the audio sequence (S70), and if it is the first track, it is checked whether there is registered data next to that data (S74), and if there is, the sequence is changed to the next data. The flag of the first track is set (S75).

If the registered data in the S table is not the beginning of the sequence (S70), it is checked whether it is the last track of the audio sequence (S71), and a flag of the last track of the audio sequence is set to the data before that data (S7).
3). If it is not the last track of the audio sequence (S7
1) Check whether it is the last registered data in the S table (
S? 2) If the data is the last, a flag for the last track of the audio sequence is set in the registered data before that data (S73).

Then, use the S table to delete the registered data5.
76) Decrement the number of audio tracks, that is, the number registered in the S table (S7?). S table access/
The counter is incremented 567), it is checked whether the S table search is finished or not (368), and the sequence from S53 onward is repeated until the search is finished.

As described above, in this embodiment, the data table created by the first search operation is checked in the second search to avoid any inconvenience during actual reproduction and recording operations. Furthermore, if discrimination between audio and video is performed using the synchronization signal added to the video signal, an audio signal with a sine wave of a specific frequency, for example, a 100 Hz sine wave at a signal compression rate of 1/640, will be detected. When attempting to distinguish the signal, it corresponds to a frequency approximately four times that of the horizontal synchronizing signal, and a problem arises in that the signal is mistakenly recognized as a video signal by the video signal reproducing circuit. a) S
As shown in steps 9 to S10 and S24 to S27, if the track has an audio signal recorded, it is determined whether there is a flag or control code recorded along with the audio signal, and the number of synchronization signals in a predetermined time is determined. Since it has already been determined, it can be determined more reliably.

Using the data table created above,
The operation when the reproduction signal level is low or the recording signal is not expected by the reproduction apparatus will be explained with reference to the flowchart of FIG. When the power is turned on, 5C50
initializes the system operating status and flags for controlling various operations (580), and waits for loading of the magnetic disk 52 (S580).
81). When the magnetic disk 52 is loaded, the 5C50 creates the T table and the S table as described above.
82), waits for an operation request from the switch group 44; For example, consider a case where a magnetic disk recorded as shown in FIG. 6 is loaded. FIG. 7 is a display example of the recorded contents of FIG. 6, where "()" indicates a frame image, "O" indicates a field image, and "A" indicates a track in which audio is recorded. Further, "," indicates a track (unrecorded track) that is neither audio nor image.

When a track movement request is applied from the switch group 44 to 5050 (S83), 5C50 sends the head drive circuit 9
6 to move the magnetic head 54, for example, from the sixth track to the (1st, 2nd) track, or from the 6th track to the 8th track.
Sequentially move the track position to the track (S84),
The data regarding the accessed track is read from the data table, and if the track can be reproduced normally, it waits for the next operation request from the switch group 44 (S85).
. In the case of a track that cannot be reproduced normally due to a low playback signal level, or a track that contains a signal that cannot be recorded or reproduced by this device, an abnormal track flag is set in the data table, and this abnormal track is - According to the flag (S85), the monitor screen is muted and a warning of the abnormal track is displayed, and a warning is also displayed on the main body (S86), and the next operation request from the switch group 44 is waited for.

When an erase operation request is input from the switch group 44 (S8
7) If the video track or video track being accessed has a video track or audio track that corresponds to each other, the 5C50 deletes the video track or audio track according to the erase mode.
The audio track or video track and the corresponding audio track are deleted (S88).

For audio or video tracks that do not have a corresponding video or audio track, 5050 erases them regardless of the erase mode. When the playback operation is started (S89), audio and video are sequentially played back according to the data table, but tracks whose abnormal track flags are set in the data table are not accessed (S90). When the recording operation is started (S9
1) Recording of video and audio is performed while sequentially accessing unrecorded tracks (592). However, tracks for which the abnormal track flag is set in the data table are not accessed as in the case of playback operations.

In this embodiment, it is possible to prevent erroneous recognition of recording/unrecording due to variations in noise level among magnetic disks, and it is also possible to prevent erroneous recognition of specific audio recordings. Furthermore, since the unrecorded state is determined based on the absolute track position, the time required to move the head to the optimum signal reproduction position can be saved. Since the position where each track can be optimally reproduced is stored as the amount of displacement from the absolute track position of that track, the access time for each track can be effectively shortened. 7 Table 1 Track table (T table) b7: Flag indicating presence/absence of recording bO: Audio/video discrimination flag b5 to bO For Nibsion data video track b5: Recording signal abnormality flag b4: Indicating presence/absence of ID data Flag b3: Field/frame discrimination flag b2: Frame inside/outside discrimination flag b1 = Audio correspondence flag bO is: Voice sequence head correspondence flag For audio track b5 to bO: Corresponding video track number B7: Displacement direction 86 to B discharge displacement side Of course, the invention is applicable to both recording-only devices and playback-only devices. In this embodiment, a magnetic disk is used as an example of the recording medium, but the present invention is not limited to this, and other types of media such as an optical disk or a magneto-optical disk may be used.

Table 2 Sequence table (S table) b7: Sequence start flag b6: Sequence end flag b5 to bO = Audio track number [Effects of the invention] As can be easily understood from the above description, the present invention For example, if the reproduction signal level is low or the signal cannot be recorded or reproduced, predetermined processing such as a warning is performed, so the user can know the cause of the abnormality and prevent erroneous recording, erroneous erasure, or abnormal playback. It is possible to prevent such malfunctions, and also to prevent the user from mistakenly assuming that the device is malfunctioning.

[Brief explanation of the drawing]

FIG. 1A is a block diagram of a recording system according to an embodiment of the present invention, FIG. 1B is a block diagram of a reproduction system thereof, and FIG.
) to (e) are flowcharts of table creation, Figure 3 (
a) to (C) are flowcharts of missing processing, FIG. 4A is the format of the audio track, FIG. 4B is the format of the sector, FIG. 5 is a schematic flowchart showing the operation for abnormal tracks, and FIG. 6 is the magnetic FIG. 7, which is an example of the recorded content on the disc, is an example of content display corresponding to the recorded content of FIG. 6. 54: Magnetic head 66: Video playback circuit 78: Flag detection circuit 80: Control code detection circuit 86
: Timing signal generation circuit Fig. 2 (b) Fig. 2 (cl) Fig. 3 ((1) Fig. 3 (C) Fig. 4A Fig. 4B Fig. 5 Lock; Wai field Fig. 6

Claims (1)

[Claims] A recording or reproducing device that searches and stores information regarding the recorded content of a recording medium and performs subsequent recording, reproducing, or erasing operations according to the stored content, and is a track where the reproduced signal level is so low that the type of signal cannot be determined, or A recording or reproducing apparatus characterized in that an abnormality flag is assigned to a track in which an unreproducible signal is recorded, and predetermined processing is performed when recording or reproducing the track.