JPH06139685A - Disk recording and reproducing method - Google Patents

Abstract

PURPOSE:To enable efficiently looking overlapping programs in series. CONSTITUTION:The record of a program B on a magnetooptical disk is started at the time t2 while looking the broadcasting of the program A by a television. When the program A is finished at the time t3, the recording is made to continue as it is and also a reproduction with N-fold speed is started by a pickup which is independently provided. When the reproduction fetches up with the recording operation at the time t4, the reproducing operation of the magneto- optical disk is stopped, then the program B outputted from a tuner is outputted as it is and displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk recording / reproducing method suitable for use in, for example, a magneto-optical disk device.

[0002]

2. Description of the Related Art For example, as shown in a timing chart of FIG. 8, a program 1 is broadcast on a predetermined channel in a time zone from time t1 to t3, and on another channel, a time from time t2 to t4. It is assumed that program 2 is being broadcast on the obi. That is, in the time period from time t2 to t3, the two programs are in an overlapping state.

Conventionally, in such a situation, one of the following two methods has been adopted. The first is the method shown in the timing chart of FIG. That is, in this case
While watching the program 1 on the television receiver, the user records the program 2 on the video tape by the video tape recorder as the back program.

The second method is the method shown in the timing chart of FIG. In this method, the program 1 is recorded as a back program and the program 2 is viewed as it is.

[0005]

However, according to the method shown in the timing chart of FIG. 9, since the program 2 can be viewed only after the recording of the program 2 is finished, the program 1 is finished. After that, the time from the time t3 to the time t4 until the recording of the program 2 is finished becomes an idle time.

Further, according to the method shown in the timing chart of FIG. 10, since the recorded program 1 is viewed after the program 2 ends, after the program 1 starts to be broadcast,
Time t1 to time t2 until the broadcast of program 2 starts
It will be a free time until.

Therefore, none of the methods could watch two programs from time t1 to time t4.

For such a case, for example, in a television receiver having a picture-in-picture function, the program 2 is superposed on the small screen while the program 1 is being broadcast from time t2 to time t3. Is made possible. However, according to this method, since two screens must be viewed at the same time, the attention is dispersed, and in the end, there is a problem that any program cannot be enjoyed deeply.

The present invention has been made in view of such a situation, and makes it possible to efficiently watch two programs in a series when the programs overlap.

[0010]

In the disk recording / reproducing method of the present invention, the recording pickup and the reproducing pickup can be operated independently at the same time, and the input signal is recorded by the recording pickup. When a playback command is issued during playback, recording by the recording pickup is continued, special playback is started by the playback pickup, and special playback is continued until the special playback catches up with the recording. .

The special reproduction may include N (N> 1) times speed reproduction and still image reproduction.

[0012]

In the disk recording / reproducing method having the above structure,
If a playback command is issued while recording is in progress,
Recording is continued as it is, and trick play is executed until it catches up with recording. Therefore, it is possible to efficiently watch two or more overlapping programs in a series.

[0013]

1 is a block diagram showing the configuration of an embodiment of a magneto-optical disk device to which the disk recording / reproducing method of the present invention is applied. The video signal input from a TV tuner (not shown) and the audio signals of the two channels (left and right stereo audio signals) are respectively low pass filters (LP
F) After removing unnecessary high frequency components by 1 to 3, A
A / D conversion is performed by the / D converters (ADC) 4 to 6. The video signal is input to the source coding circuit 7 and band-compressed by a method such as DCT or DPCM. The memory 8 stores the data necessary for this compression processing at a predetermined timing. Further, the source coding circuit 9 encodes the input 2-channel audio signal by a method such as PCM. The memory 11 stores audio data in the coding process.

The multiplexer 12 stores the video data and the audio data input from the source coding circuits 7 and 9 in the memory 13 as necessary, and combines them with additional information such as a time code output from the additional information generating circuit 14. To do. This combined data is input to the ECC encoder 15 to which an error detection and correction code is added, and then to the recording coding circuit 16 to be converted into a recording code (channel coding is performed). And recording coding circuit 1
The output of 6 is recorded via the recording amplifier 17 to the recording pickup 1
8 and is recorded on the magneto-optical disk 19.

On the other hand, the reproduction pickup 31 reproduces and outputs the signal recorded on the magneto-optical disk 19. This reproduction signal is decoded by the channel decoder 33 via the reproduction amplifier 32, and then,
The data is input to the ECC decoder 34 and subjected to error detection / correction processing. The output of the ECC decoder 34 is input to the demultiplexer 35, and is separated into audio data, video data and additional information. The memory 36 stores data as needed for this demultiplexing process.

The video data is stored in the memory 38 via the source decoder 37 and decoded by the source decoder 37. The audio data is stored in the memory 40 via the source decoder 39 and is decoded into 2-channel audio data. Further, the additional information is supplied to the system controller 49.

The video data and the 2-channel audio data are supplied to the contact point b of the switch 47 through the D / A converters 41 to 43 and the low pass filters 44 to 46, respectively. The video signal output from the television tuner and the 2-channel audio signal (the signals input to the low-pass filters 1 to 3) are input to the contact point a of the switch 47. Switch 47
Selects a signal supplied to the contact a or the contact b and outputs it to the monitor 48.

A system controller 49 including a microcomputer, for example, switches the switch 47 in response to an input from the key 50 or controls the reproducing pickup 31 and the recording pickup 18 via the pickup control circuit 52. Has been done. Further, a predetermined message or the like is displayed on the display unit 51 at a predetermined timing.

2 to 4 show the positional relationship between the recording pickup 18 and the reproducing pickup 31. As shown in FIG. As shown in these figures, the recording pickup 18 and the reproducing pickup 31 are arranged at positions separated by 180 degrees with the center of rotation of the magneto-optical disk 19 interposed therebetween. This allows
The recording pickup 18 and the reproduction pickup 31 can independently perform recording and reproduction at the same time. The magneto-optical disk 19 is placed on a rotating base 61 and rotated by a motor 62 at a predetermined speed.

Next, the recording operation will be described. When a predetermined one of the keys 50 is operated to instruct the system controller 49 to record the output of, for example, a television tuner, the system controller 49 sets a recording mode, controls each unit, and executes a recording operation. At this time, the video signal from which unnecessary high-frequency components are removed by the low-pass filters 1 to 3 and the 2-channel audio signal are A /
A / D conversion is performed by the D converters 4 to 6, and the memories 8 and 1 are respectively passed through the source coding circuits 7 and 9.
Stored in 1. The source coding circuit 7 compresses the video data stored in the memory 8. Further, the source coding circuit 9 compresses the 2-channel audio signal. The multiplexer 12 stores the video data and the audio data input from the source coding circuits 7 and 9 in the memory 13 and combines them.

The data synthesized by the multiplexer 12 is supplied to the ECC encoder 15 to which an error detection / correction code is added, and then converted into a recording code by the recording coding circuit 16. Then, this record-coded data is amplified by the recording amplifier 17, and then supplied to the recording pickup 18 moved to a predetermined position by the pickup control circuit 52 and recorded on the magneto-optical disk 19.

At this time, the additional information generating circuit 14
Since the additional information such as the time code output by is supplied to the multiplexer 12 and is superimposed on the video data and the audio data, the time code is recorded on the magneto-optical disk 19 together with the video data and the audio data.

Further, in the recording mode, the system controller 49 executes the processing shown in the flowchart of FIG. That is, when recording is first started by operating the key 50 in step S1, the recording start time at that time is set to the additional information generation circuit 14
Is read from the time code output by the CPU, and the time code is stored in the built-in memory in step S2.

Next, the reproducing operation will be described. Key 5
When the playback operation is commanded by operating 0, the system controller 49 moves the playback pickup 31 to a predetermined playback position via the pickup control circuit 52. The reproduction pickup 31 has the magneto-optical disc 1 at that position.
9 playback starts. The reproduction signal output from the reproduction pickup 31 is amplified by the reproduction amplifier 32 and then input to the channel decoder 33 and decoded. The output of the channel decoder 33 is further input to the ECC decoder 34, and error detection and correction processing is executed.
Then, the output of the ECC decoder 34 is supplied to and stored in the memory 36 via the demultiplexer 35.
The demultiplexer 35 separates the data stored in the memory 36 into video data, audio data and additional information, and outputs them to the source decoder 37, the source decoder 39 or the system controller 49, respectively.

The source decoder 37 temporarily stores the video data input from the demultiplexer 35 in the memory 38 and executes a decoding process. Further, the source decoder 39 temporarily stores the audio data input from the demultiplexer 35 in the memory 40 and executes the decoding process. The video data and the 2-channel audio data decoded by the source decoders 37 and 39 are respectively D / A converted by the D / A converters 41 to 43.
After the A / A conversion, unnecessary high-pass components are removed by the low-pass filters 44 to 46. And switch 47
It is output to and displayed on the monitor 48 via the contact point b.

Next, with reference to the flow chart of FIG. 6, the operation when a time shift operation for executing the reproducing operation is instructed during the recording operation will be described. First, in step S11, it is determined whether or not the recording pickup 18 is currently performing a recording operation. If the recording operation is not in progress, the process proceeds to step S12 and an alarm is displayed.
That is, at this time, the system controller 49 displays the display unit 5
A control signal is sent to 1 to display that the time shift cannot be executed because the reproduction is not being performed during the recording operation.

When it is confirmed in step S11 that the recording pickup 18 is in the recording operation, the process proceeds to step S13, and it is determined whether or not the reproduction start time is designated by operating the key 50. In particular, when the reproduction start time is not designated, the process proceeds from step S13 to step S14, and the time difference between the current time and the recording start time (stored in step S2 of FIG. 5) is calculated,
The approximate position where the reproduction pickup 31 is jumped is calculated. Then, according to the calculation result, the reproduction pickup 3
1 is moved to that position.

That is, the system controller 49 knows the present time from the time code output from the additional information generating circuit 14. Then, this time is compared with the recording start time stored in step S2 of FIG. Then, according to the comparison result, the pickup control circuit 52 is controlled to cause the reproducing pickup 31 to jump to the position where the time code of the recording start time is recorded.

On the other hand, when the reproduction start time is designated in step S13, it is determined whether or not the designated time is between the recording start time stored in step S2 and the current time. . When the designated reproduction start time is before the recording start time or after the current time, the reproduction is impossible.
Proceeding to step 12, the alarm is displayed.

When it is determined in step S15 that the reproduction start time is between the recording start time and the current time, the process proceeds to step S16, and the current time is compared with the designated time. Then, according to the comparison result, the reproduction pickup 31 is moved to the time code recording position at the designated time.

That is, at this time, the system controller 49
Monitors the time code contained in the signal reproduced from the magneto-optical disk 19 output from the demultiplexer 35, and moves the reproduction pickup 31 to the designated time code position.

After step S14 or step S16, the process proceeds to step S17 to wait until the tracking servo is applied. After the tracking servo locks,
In step S18, the time code is read from the reproduction signal and the current pickup position is read. In response to the reading result, the system controller 49 responds to the position requested by the reproduction pickup 31 in step S19, that is, the recording start time set as the reference in step S14 or the specified reproduction start time set in step S16. It is determined whether or not the reproduction pickup 31 is located at the position.

When the position of the reproduction pickup 31 is not located at the required position, the process proceeds to step S20, the requested position and the current position are compared, and the system controller 49 responds to the comparison result by the pickup. The reproduction pickup 31 is controlled via the control circuit 52 to jump to the required position. Then, returning to step S17,
The subsequent processing is repeated. As a result, step S1
At 9, the same operation is repeated until the reproduction pickup 31 is located at the requested position.

When it is determined in step S19 that the reproduction pickup 31 is located at the predetermined position, the process proceeds to step S21, and it is determined whether or not the reproduction speed is designated. If no speed is specified, the process proceeds to step S22, and high-speed reproduction is started at a preset default speed (N speed).

That is, at this time, the system controller 49
Controls the reproduction pickup 31 via the pickup control circuit 52 to start reproduction from a predetermined position.
The reproduction speed at this time is N (N> 1) times.

If it is determined in step S21 that the reproduction speed is instructed, the process proceeds to step S23, and reproduction at the specified speed is started. The user designates the speed by operating the key 50.

After step S22 or S23, the process proceeds to step S24, and it is determined whether or not there is an instruction to change the reproduction speed. When the playback speed is changed by the user by operating the key 50,
In step S25, the reproduction speed is changed to the designated speed. Especially, when the command for the reproduction speed is not input, the speed is maintained as it is.

Then, in step S26, it is determined whether or not the time code reproduced from the magneto-optical disk 19 and the time code (current time) output from the additional information generating circuit 14 match. If not, step S
The procedure returns to 24 and the subsequent processing is repeated. Then, in step S26, when it is determined that the time code of the reproduction signal and the current time match (that is, it is determined that the reproduction catches up with the recording), the process proceeds to step S27, and the system controller 49 turns on the switch 47. It is controlled to switch the contact from the b side to the a side. As a result, the magneto-optical disk 19 that has been selectively output until then is output.
Instead of the playback signal from the monitor, the video signal and the 2-channel audio signal output from the tuner are directly displayed on the monitor 4
8 will be supplied.

At this time, the system controller 49
Stops playback.

The above operation will be described in detail with reference to the timing chart of FIG. That is, as shown in the timing chart of FIG. 7, the program A is broadcast on a predetermined channel from time t1 to t3, and the program C is broadcast on the channel from time t5 to time t6. In other channels, time t
The program B is broadcast from time 2 to time t5.

Now, it is assumed that the user views all of the program A, the program B, and the program C in the time zone from the time t1 to the time t6. At this time, the user operates the key 50 to watch the program A on the monitor 48 in real time. At this time, the system controller 49 switches the switch 4
7 is switched to the contact a side, and the monitor 48 is allowed to output the video signal output from the tuner and the 2-channel audio signal as they are.

When the time t2 arrives, the user operates the key 50 to command the start of the recording of the program B (or when the time t2 arrives, the user reserves in advance to record the program B). deep). As a result, the recording pickup 18 starts recording the program B on the magneto-optical disk 19. The user is watching the program A as it is even after the time t2.

When the time t3 arrives and the broadcast of the program A ends, the user operates the key 50 to instruct the reproduction of the program B. At this time, the system controller 49 controls the reproducing pickup 31 to drive the magneto-optical disk 19 at N times speed.
To start playing.

As shown in FIG. 2, while the program B is being recorded from the innermost position by the recording pickup 18, the recording / reproducing pickup 31 is recorded from the innermost position.
Shows the state immediately after the start of reproduction.

Of course, as shown in FIG. 3, the position at which the recording of the program B is started may be an arbitrary position (a position on the outer periphery) instead of the position on the innermost periphery.

Further, FIG. 4 shows a state in which the recording is performed by the recording pickup 18 and the reproducing is performed by the reproducing pickup 31.

At this time, the switch 47 is switched to the contact b side. Therefore, the reproduced image of the program B at N times speed can be seen on the monitor 48.

While this reproduction is N times speed, the recording is executed at the normal speed, so that the recording finally catches up with the reproduction at the time t4. At this time, the switch 47 is switched from the contact b side to the contact a side, and the output of the tuner is directly output to the monitor 48 and displayed. Therefore, the user can watch the program B in real time from the time t4. Then, after the end of the program B, the channel can be switched again to watch the program C in real time.

While the program B is being reproduced at N times speed, it is possible to operate the key 50 to perform still image reproduction or frame advance reproduction. However, if this is continued for too long, it becomes impossible to catch the reproduction until the end of the program B.

As described above, while watching the drama (program A), for example, the program B being performed as the back program
If the (night game relay) is recorded on the magneto-optical disk 19, the special reproduction (N times speed reproduction) of the program B is started at the time when the program A is finished, and the progress of the night game performed until then is started. You can watch normal real-time broadcasts when you get to know it and the playback catches up with the recording. Therefore, at the time t5, when the night game relay is finished, the next program C (movie) can be subsequently watched.

At time t4, when the reproduction catches up with the recording, the reproduction is stopped but the recording is continued as it is. Therefore, it is of course possible to watch the program B at a standard reproduction speed at any time, as in the normal case, if necessary.

Usually, even if a back program is recorded and one tries to watch it later, there is often no time left and the viewer does not watch it. However, in the above embodiment, since the back program can be watched in real time, it is not necessary to provide a special time for watching the program later.

In order to catch up the reproduction with the recording, N times speed reproduction is performed, which is different from the normal reproduction, but it is not always necessary to watch all programs such as baseball relay at standard speed. It is possible to fully grasp the entire flow by returning to a reproduction speed of 1 × speed, if necessary, and then fast-forwarding at an N × speed.

That is, in the case of the picture-in-picture system, since two programs must be watched in parallel at the same time, each program is watched intermittently. On the contrary,
In the case of the present embodiment, although it is high speed, one program is being watched (each program is being watched in a series), so that it is possible to concentrate on that and it is easy to grasp the overall flow.

In this way, from time t1 to time t5
It is possible to watch the two overlapping programs A and B that are broadcast during the time period within the time zone.

In the above embodiments, the video signal and the audio signal are recorded as a composite signal, but they are separated into a luminance signal and a color difference signal and recorded as a component signal or a baseband HDTV signal. Thus, it is also possible to separately record the luminance signal and the two color difference signals.

[0057]

As described above, according to the disc recording / reproducing method of the first aspect, when a reproducing command is issued during recording, recording is continued and special reproduction is executed. Therefore, it is possible to efficiently enjoy a plurality of programs in a series.

According to the disc recording / reproducing method of the second aspect, since the reproduction is performed at N times speed, the reproduction can be surely caught up with the recording.

Further, according to the disk recording / reproducing method of the third aspect, since the still image can be reproduced on the way, it is possible to confirm a detailed scene as necessary.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a magneto-optical disk device to which a disk recording / reproducing method of the present invention is applied.

FIG. 2 is a diagram illustrating a positional relationship between a recording pickup 18 and a reproduction pickup 31 of FIG.

FIG. 3 is another diagram for explaining the positional relationship between the recording pickup 18 and the reproduction pickup 31 of FIG.

FIG. 4 is still another diagram for explaining the positional relationship between the recording pickup 18 and the reproduction pickup 31 of FIG.

5 is a flow chart for explaining an operation at the time of recording in the embodiment of FIG.

FIG. 6 is a flowchart illustrating an operation in the case of reproducing while recording in the embodiment of FIG.

FIG. 7 is a timing chart explaining the operation of the embodiment of FIG.

FIG. 8 is a timing chart illustrating a state in which two programs overlap.

FIG. 9 is a timing chart illustrating one method of recording a back program when two programs overlap.

FIG. 10 is a timing chart illustrating another method of recording a back program when two programs overlap.

[Explanation of symbols]

 7, 9 Source coding circuit 12 Multiplexer 18 Recording pickup 19 Magneto-optical disk 31 Playback pickup 35 Demultiplexer 37, 39 Source decoder 47 Switch 48 Monitor 49 System controller 50 Key 51 Display section 52 Pickup control circuit

Claims (3)

[Claims] 1. A recording pickup and a reproducing pickup are independently operable at the same time, and when a reproducing command is issued while an input signal is being recorded by the recording pickup, the recording is performed. A disk recording / reproducing method characterized by continuing recording by a pickup for reproduction, starting special reproduction by the reproduction pickup, and continuing the special reproduction until the special reproduction catches up with recording. 2. The disc recording / reproducing method according to claim 1, wherein the special reproduction is reproduction at N (N> 1) times speed. 3. The disc recording / reproducing method according to claim 2, wherein the special reproduction includes still image reproduction.