JP2872313B2 - Recording or playback device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a recording / reproducing apparatus.

[Conventional technology]

Conventionally, as a reproducing apparatus for reproducing from a medium in which an audio signal and a video signal indicating, for example, a still image are recorded in pairs with each other, an apparatus for reproducing information recorded in video floppy according to the still video standard is known. Are known. In such a standard, an audio signal and a video signal are recorded in mutually different areas, and a corresponding video signal (a video signal to be reproduced simultaneously with the audio signal at the time of reproduction) is recorded at any position on the medium. Code information (also referred to as an ID signal) indicating whether or not the data has been recorded.

[Problems to be solved by the invention]

In the above-described device, since the audio signal and the video signal are recorded in different areas, it is possible to delete or rewrite only the audio signal and the video signal only.

Therefore, the audio signal and the video signal that are paired with each other may be erased independently. At this time, there is a problem that the correspondence between the two becomes different from that at the time of recording.

For this reason, for example, when reproducing information recorded from a medium from which a video signal has been erased among a pair of audio and video signals, the audio signal is reproduced from a speaker,
Since the area where the video signal corresponding to the audio signal is recorded is deleted, for example, noise may occur on the screen, or the user may recognize that the machine is malfunctioning. Or was inconvenient.

Such a problem is a problem that occurs when the audio signal and the video signal which are recorded on the medium and form a pair are independently erased or rewritten, regardless of the type of the medium.

An object of the present invention is to provide a recording / reproducing apparatus which can be used in view of the above point and prevents noise from being reproduced by preventing an erroneous reproduction of an audio signal as an image.

[Means for Solving the Problems] In view of the above problems, the present invention provides a recording method for recording or reproducing information on or from a medium in which an audio signal and a video signal are recorded at different positions on the medium. A reproducing apparatus, comprising: erasing means for erasing a position on the medium where the video signal is recorded, and means for preventing recording of an audio signal at a position erased by the erasing means. .

〔Example〕

First, a still video format as a premise of the present embodiment will be briefly described.

FIG. 5 (a) shows one of the audio tracks recorded on the track formed on the magnetic disk. In the audio track, one track is divided into four sectors, which are shown as S ₁ , S ₂ , S ₃ and S ₄ respectively. FIG. 5B shows an example of the sector format. In one sector, a start flag is recorded at a start position, and a start signal of the audio sector is recorded. Next, as a control code, a time axis compression ratio of the audio signal, a corresponding video signal track address of the audio signal, and an audio signal are recorded. Is recorded continuously over a plurality of tracks, a track address at which the audio is started and a track address at which the next audio signal is recorded are recorded as control codes for audio signal track reproduction. .

Such control codes include the following nine words.

 W0 is a track address where audio information is stored.

W1 is the track address at which recording was started in voice recorded over multiple tracks.

W2 is the track address where the next audio signal is recorded.

W3 is the track address where the video signal corresponding to the audio signal is recorded.

W4 is unused, W5 is time axis compression ratio, etc., W6, W7, W8 are days,
Shows month and year information.

 Next, an apparatus according to an embodiment of the present invention will be described.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, in which 1 is a video floppy which is a signal recording medium, 2 is a spindle motor which drives the video floppy, 3 Is a signal recording with video floppy
Magnetic head for reproduction, 4 is an FM demodulator, 5 is a de-emphasis circuit for video reproduction, 6 is a video reproduction circuit, 7 is a synchronization signal separation circuit for separating a synchronization signal from a video signal, and 8 is a de-emphasis for audio reproduction. circuit,
Reference numeral 9 denotes an A / D converter, 10 denotes a flag / control code separation circuit for separating a flag / control code added to an audio signal, 11 denotes a memory, 12 denotes a D / A converter, 13 denotes an audio reproduction circuit, and 14 denotes a voice reproduction circuit. A head drive motor for driving the magnetic head, and an erase current circuit 15 for generating an erase current for erasing a signal recorded on the video floppy.

16 is a control circuit for controlling the system, 17 is an FM modulator, 18 is a pre-emphasis circuit for recording an audio signal, 19 is a D / A converter, and 20 is a flag for adding a flag / control code to the audio signal.・ Control code adder, 21 is memory, 22 is D / A
The converter 23 is an audio processing circuit for performing processing such as noise reduction. 24 is a switch for switching the signal system to the magnetic head, 25 is an operation key for operating the system, and 26 is a display.

 Next, the operation of the apparatus of the present embodiment will be described.

When switch 24 is inserted into a, video floppy 1
The signal recorded above is converted into an electric signal by the magnetic head 3, passes through the FM demodulator 4, and when the magnetic head 3 is on the track where the video is recorded, the FM demodulated signal is converted to a de-emphasis circuit 5. , And is output as a video signal through a video reproduction circuit 6. The synchronizing signal separating circuit 7 separates the synchronizing signal from the video signal and sends the synchronizing signal to the control circuit 16. When the magnetic head 3 is on the track where the voice is recorded, the FM demodulated signal is supplied to the de-emphasis circuit 8.
, And is converted into a digital signal by the A / D converter 9. The flag / control code is separated from the digitized signal by the flag / control code separation circuit 10 and transmitted to the control circuit 16.

Signals other than the flag / control code are converted to analog signals by a D / A converter via an audio memory 11, and output as audio signals by an audio reproduction circuit 13. When the switch 24 is turned on, the signal can be recorded on the video floppy. An audio signal is input to this system and passes through an audio signal processing circuit to A / D converter 2.
The signal is converted into a dental signal by 2 and time compression is performed by the difference between the clock for writing and reading in the audio memory 21. The flag control code from the control circuit 16 is added to the audio signal by the flag control code adder 20, and the audio signal is converted by the D / A converter 19 into an analog signal. The output of the D / A converter 19 is a time-compressed audio signal, which is recorded on the video floppy 1 by the magnetic head 3 via the pre-emphasis circuit 18 and the FM modulator.

When the switch 24 is turned on to the switch c, an erasing current is output from the erasing current circuit 15 so as to erase the video floppy recording signal, and the recording signal is erased.

FIG. 2 is a flowchart showing the operation of the system according to the present embodiment. The operation will be described below with reference to FIG.

After inserting the video floppy 1 into the system, the control codes of all the audio tracks recorded on the video floppy are read out by the magnetic head 3 and stored in the control circuit 16 through the reproducing system (S201).

When the reading of the control code from the audio track and the storage in the control circuit are completed, in the present embodiment, first, the system can be erased (erasing mode).
(S202, S203).

The track to be erased is designated by the operation keys shown in FIG. 25 (S204), and an erasure request wait is made in (S205). When an erasure request is input by the operation key, the recording signal of the designated track is erased. .. (S206) It is determined whether or not the erased track is a video corresponding to the audio based on the control code stored in (S201). (S207) If the result of determination is that the erased signal is video corresponding to audio, the erased track number is stored in the control circuit. (S208) When a new signal is recorded after erasing the recording signal of the video floppy, whether to record the audio signal or the video is previously input by the operation keys in FIG. 25. I have. Therefore, if it is a voice recording, it is determined in step S208 that the signal stored in the track stored in the control circuit is recorded. (S212) Next, in (S213, S214), the voice is recorded in the empty track.

When recording a video, the track stored in (S208) is set as an empty track so that the video can be recorded.

As described above, according to this embodiment, when an image associated with audio is deleted, the number of the same track is stored in the system, and a signal is recorded when an audio signal is recorded. By discriminating a track and prohibiting recording of an audio signal on the track, there is an effect of preventing output of the audio signal to the monitor.

Next, another embodiment of the present invention will be described with reference to FIGS.

FIG. 6 shows another example of the configuration shown in FIG. 1, which is different from FIG. 1 in that a synchronization signal generation day 27 and a switch 28 are provided.

In this embodiment, unlike the embodiment shown in FIGS. 2 and 3, if the track on which the video is recorded is erased, it is erased when the recording / reproducing apparatus receives an instruction to take out the video floppy. By providing means for recording only the video synchronization signal in the video track and discharging the video floppy when the recording of the synchronization signal is completed, when the same video floppy is inserted into the recording / reproducing apparatus, the erased video is deleted. Since the synchronization signal is recorded in the track, such a device judges that the video signal is recorded, prohibits the recording of the audio signal on the track, and prevents the audio signal from being output on the monitor. is there.

That is, when the switch 24 is turned on to the switch b and the switch 28 is turned on to the switch e, the sync signal output from the sync signal generating circuit 27 is recorded in the video floppy 1.

The method of recording and ejecting the synchronization signal described above is shown in the flowchart of FIG.

 The operation is as shown in the flowchart.

As described above, according to this embodiment, in addition to the effects of the above-described embodiment, if the synchronization signal is recorded in the corresponding video track in the first audio reproduction, the image output to the monitor may be disturbed. There is an effect that there is nothing.

 Next, still another example of the present embodiment will be described.

In this embodiment, the configuration is the same as that shown in FIG. 1 except that a circuit is provided in the configuration shown in FIG. 1 for determining the presence or absence of recording of an access track on the head based on the presence or absence of a reproduced signal from the head.

 The operation will be described below.

FIG. 7 is a flowchart in this embodiment, and the operation will be described with reference to the figure.

It is determined whether or not the video floppy 1 is inserted into the system (S201). If the video floppy 1 is inserted, the magnetic head 3 is moved from the innermost circumference to the outermost circumference by the head drive motor 2 to move the head. At the same time, an empty track is detected for all the tracks (S202), and a control code is read out from the voice-recorded track.
Is stored in the memory (S203).

When the empty track detection for all the tracks and the control code reading for the audio track are completed, the track number of the video corresponding to the audio is extracted from the control code, and whether or not the track number is detected as an empty track according to (S202). Are compared and determined ... (S204).

After the comparison between the control code and the empty track detection result is completed, the audio / video playback mode is set (S20).
5) When the playback audio track number is input by the operation keys 25 and the operation of starting playback is performed (S206, S20)
7) If the magnetic head 3 is moved to the designated audio track and the signal read from the audio track is stored in the audio memory 11 (S208), the audio stored in the audio memory based on the result of (S204) It is determined whether or not a video is recorded at the video track address corresponding to (1) (S209). If there is a corresponding video, the magnetic head 3 is moved to the video track to reproduce sound and video. … (S211) When no video is recorded at the corresponding video track address, a video track corresponding to a previously reproduced audio track in the same audio sequence or a video track corresponding to a continuous audio track in the same audio sequence is recorded. The magnetic head 3 is moved (S213), and audio and video are reproduced.

In this case, other than the video track corresponding to the continuous audio, any video in the same sequence or any video in the video floppy may be reproduced together with the audio.

Next, a modified example of the flowchart shown in FIG. 7 will be described with reference to FIGS. Only the differences between FIG. 8 and FIG. 9 from FIG. 7 will be described.

[Other embodiments]

If it is determined that there is no video corresponding to the sound as shown in FIG. 8 (S209). Mute video output ...
(S301). Play audio. (S302) Here, the video output is muted, but only the synchronization signal may be video output.

If it is determined that there is no video corresponding to the sound as shown in FIG. 9 (S209). The absence of the corresponding video is output to the monitor or displayed on the display 16 of this unit.
(S401). Play audio. (S402) As described above, according to the embodiment shown in FIGS. 7 to 9, even if it is determined by the control code that there is a corresponding video, when the video does not actually exist, the same video flow By outputting or muting the image in the tweeter on the monitor, it is possible to prevent the image of only noise from being displayed on the monitor screen, or to give a display indicating that the corresponding image does not exist. The user can understand the reason why the video is not output on the monitor.

 Next, still another embodiment will be described.

 FIG. 10 is a flow chart of such an embodiment.

In this embodiment, the hardware configuration is the same as the configuration shown in FIG.

In the flow chart of FIG. 10, the video floppy 1 is first inserted into the system, then the control codes of all the audio tracks recorded in the video floppy are read out by the magnetic head 3 and passed through the reproducing system, as in the flow described above. Stored in the control circuit 16 (S201).

Next, the video track to be deleted is selected by the operation key 25 (S202).

If the erase track is selected, switch 24 is turned on.
And an erasing current is applied to the magnetic head 3 to erase the recording signal of the track to be erased. ... (S203).

When the erasing operation is completed, it is determined from the control code stored in (S201) whether or not the sound corresponding to the erased video exists. If there is a corresponding voice as a result of the determination, the process branches to (S206). … (S204, S20
Five).

When the video with the corresponding audio is deleted, the corresponding audio track and the magnetic head 3 are moved (S206).
The control code recorded together with the audio is rewritten so as not to correspond to the video. ... (S207).

It is determined whether or not the control code rewriting has been completed for all the audio tracks from which the corresponding video has been erased, and if not, the operation of (S206 to S207) is repeated.

Audi after rewriting control code
o / Video playback mode.

According to the above embodiment, by rewriting the control code of the audio track corresponding to the erased video to one that does not correspond to the video, it is erased when the audio and video are reproduced after the video is erased. It is possible to prevent a signal from a video track from being output to a monitor.

〔The invention's effect〕

As described above, according to the present invention, user-friendliness is good and noise generation can be prevented by preventing an audio signal from being erroneously reproduced as an image.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an apparatus according to an embodiment of the present invention, FIGS. 2 and 3 are flowcharts for explaining the operation of the apparatus shown in FIG. 1, and FIG. FIG. 5 is a flow chart for explaining the operation of another embodiment, FIG. 6 is a block diagram showing another example of FIG. 1, and FIGS. 7 to 10 are those of FIG. It is a figure showing another example of a flow chart. 1 is a video floppy, 2 is a spindle motor, 3 is a magnetic head, 15 is an erase current circuit, 16 is a control circuit, and 27 is a synchronizing signal generation circuit.

Claims (3)

(57) [Claims] 1. A recording / reproducing apparatus for recording / reproducing on / from a medium in which an audio signal and a video signal are recorded at different positions on a medium, the recording / reproducing apparatus comprising: A recording / reproducing apparatus comprising: erasing means for erasing a position; and means for preventing recording of an audio signal at a position erased by the erasing means. 2. The recording / reproducing apparatus according to claim 1, wherein said blocking means includes means for recording a synchronization signal at the erased position. 3. The recording / reproducing apparatus according to claim 1, wherein said blocking means is means for prohibiting application of the audio signal at the erased position to a recording head.