JPS6337804A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain accurate consecutive recording by comparing a sound signal stored in a field memory with a sound signal on a reproduced recording track, discriminating the final recording track so as to restart the recording. CONSTITUTION:A write star signal is outputted from a system controller 37 to a field memory control circuit 41 during the recording of a recording signal, a digital sound signal by one field is stored in a field memory circuit 21 and the same signal as the sound signal of the final recording track just before the tentative stop of the recording is digitized and stored. In starting the re- recording, the digital sound signal in the memory circuit 21 and the signal recorded on the recording track are fed to a comparator circuit 24, where they are compared and when its error level is lower than a preset threshold level, a recording start instruction signal is outputted to the controller 37 to attain consecutive recording.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention records information signals on a recording medium, and also records information signals recorded on the recording medium. The present invention relates to a recording and reproducing device that reproduces signals.

[Conventional technology]

In recording and reproducing devices, for example, video tape recorders (
In the case of a VTR (hereinafter referred to as VTR), there is a so-called continuous recording function in which tape running is temporarily stopped during recording and recording is restarted by running the tape again.

In the above-mentioned function, the following splice recording has conventionally been performed so that the playback screen will not be disturbed when the portion of the tape where the splice recording has been performed is played back.

In addition to image and audio signals, a tracking signal for tracking control is recorded on the tape,
When performing splice recording, the tape is rewound by a predetermined amount when the recording operation is stopped for 1μ, and when the instruction to start recording again is given, the playback operation is first performed and when tracking is achieved, recording begins. When rewinding a predetermined amount to the above-mentioned ridge, the rewinding amount is counted, and the count value is counted down during playback according to an instruction to resume recording operation, and the count value is " A method has been used in which the recording operation is disabled when the voltage reaches 0''.

[Problem that the invention seeks to solve]

However, in the case of 1) one person, the location where the tape is instructed to record two tapes together does not necessarily match the location where tracking is achieved during re-recording and the recording operation is switched.

There was a problem in that it was not possible to perform continuous recording as intended.

In the latter case, the point where the count value is "0" and the point on the tape where continuous recording is instructed may not match due to a startup failure of the capstan motor etc. at the start of the playback operation performed during re-recording. there were.

The present invention focuses on the above-mentioned gap, and an object of the present invention is to provide a recording and reproducing apparatus that can accurately perform continuous recording without recording a special index signal on a recording medium.

(Means for Solving the Problems) The recording/reproducing apparatus of the present invention includes a storage means for storing a part of the information signals recorded on the recording medium;
a reproduction information signal obtained from the storage means, an information signal stored in the storage means, and an information signal obtained from the recording medium when the recording medium is reproduced, and a recording start signal is generated according to the comparison result. It is equipped with means.

(Function) With the configuration described in E, the present invention is capable of determining the start point of the splice recording on the recording medium without recording a special index signal etc. on the recording medium, and accurately records the splice recording as intended. It is something that can be done.

(Example) Hereinafter, the present invention will be explained using one embodiment of the present invention.

FIG. 1 shows a schematic configuration of an embodiment of the present invention.
0 is an image signal input terminal such as an NTSC television signal, 11 is a Y signal processing circuit that separates the luminance signal in the image signal input from the input terminal 10 and performs FM modulation, etc., and 12 is the image signal. 13 is an audio signal input terminal; 14 is an amplifier that amplifies audio No. 15 input to the audio signal input terminal 13; a noise reduction circuit that reduces noise contained in the audio signal amplified by the amplifier 14; 16 an FM modulation circuit that FM-modulates the audio signal that has passed through the noise low-band circuit 15; 17, the FM modulation circuit 16; A band pass filter circuit 18 applies a band limit to the modulated signal; 18 is a FM modulated luminance signal processed in the Y signal processing circuit 11; and a low frequency conversion color processed in the nII C symbol signal processing circuit 12. an adder for adding the signal and the FM tone-changing audio signal output from the band pass filter circuit 17; 19 is the amplifier 14;
A low-bandwidth filter that limits the bandwidth of the audio signal amplified by
a pass filter circuit, 20 an A/D conversion circuit for converting the liver voice signal band-limited by the low pass filter circuit 19 into analog and digital; 21 an A/D conversion circuit;
A field memory circuit 41 stores the audio 44 digitized by the conversion circuit 20; 41 is a field memory that controls writing and reading of the field memory circuit 21; and a control circuit 22 reads data from the field memory circuit 21. a D/A conversion circuit that converts the digitized audio signal from digital to analog;
23 is a low pass filter circuit that limits the band Al1 to the audio signal converted into analog by the D/A conversion circuit 22; 24 is the low pass filter circuit 23;
25 is a comparison circuit that compares the band-limited analog audio signal with the audio signal output from the noise low-frequency circuit 30, 25 is a changeover switch for switching between recording and playback by the system controller 37, and 26a and 26b are magnetic 38 is a head changeover switch that switches between the magnetic heads 26a and 26b; 39 is a head changeover switch that controls the switching operation of the head changeover switch; te control circuit; 40 is a head changeover control circuit 39 and field memory control circuit 41; 111 is a synchronous generation circuit that generates a synchronous signal for control; 27 is a band pass filter circuit for separating the 14 raw audio signal from the reproduction output signal of the recording magnetic head 26; 29 is a signal correction circuit that corrects the reproduced audio signal demodulated by the FM demodulation circuit 28, and 30 is the a noise reduction circuit that reduces noise included in the reproduced audio signal corrected by the signal correction circuit 29; 31 an amplifier that amplifies the reproduced audio signal whose noise has been reduced by the noise reduction circuit 30; 32 the amplifier 31; 33 is a luminance signal processing circuit that separates the luminance signal from the reproduced signal and performs FM demodulation, etc.; 34 separates the color signal from the reproduced signal and returns it to the original frequency. A color signal processing circuit 35 that performs band frequency conversion adds the luminance signal processed by the luminance signal processing circuit 33 and the color signal processed by the color signal processing circuit 34 to form a reproduced image signal. An adder 36 is an image signal output terminal that outputs the reproduced image signal formed by the +if adder 35, and 37 is a system controller that controls recording and reproduction operations of the apparatus.

In the configuration described below, in the case of normal recording, the image signal is supplied to the image signal input terminal 10, the audio signal is supplied to the audio signal input terminal 13, and the image signal is supplied to each Y signal processing circuit 1.
1, supplied to the C signal processing circuit 12. And 111
Note Y (No. 3 processing circuit 11 separates the luminance signal from the image No. 45, FM modulates the separated luminance signal, and adds it?! 5
Supply to 18. Further, the color signal is separated from the image signal supplied to the C signal processing circuit 12, and the separated color signal is similarly supplied to the adder 18.

On the other hand, the audio signal supplied to the audio signal input terminal 13 is amplified by the amplifier 14, and the noise in the amplified audio signal is removed by the noise reduction circuit 15. The voice signal from which noise has been removed is subjected to FM modulation in an FM modulation circuit 16, band-limited in a hunt pass filter 17, and then subjected to addition.
Supplied to Q118.

Then, in the adder 18, the supplied FM modulation luminance 4
No. 8, a recording signal is formed by adding the low frequency conversion color signal and the FM modulated audio signal, and the formed recording signal is:
Via the changeover switch 25 connected to the R side in the figure,
The signal is supplied to the changeover switch 38. The switching operation of the changeover switch 38 is controlled by a head changeover control circuit 39, and the connection is alternately switched between the a side and the b side in the figure in synchronization with the synchronization signal output from the synchronization signal generation circuit 40. One is controlled. The synchronizing signal is a signal of 60)1z, which is one field period, when the image signal to be recorded is an NTSC television signal. As described above, the recording signal supplied to the magnetic heads 26a and 26b is recorded on a magnetic tape (not shown).

During recording of the recording signal as described above, a write start signal is outputted from the system controller 37 to the field memory control circuit, and one of the recording signals, for example, an audio signal, is stored in the field memory circuit 21. That is, said amplifier! The audio signal amplified in step 5 is band-limited by a low pass filter 19, and converted from an analog audio signal to a digital audio signal by an A/D conversion circuit 20.

The digital audio signal converted by the A/D conversion circuit is synchronized with the synchronization signal output from the synchronization signal generation circuit 40 to the field memory circuit 21 whose write operation is controlled by the field memory control circuit 37. Then, the digital audio signal for one field is stored. Then, the digital audio signal for the next one field,
When supplied to the field memory circuit 21, the digital audio signal for one field already stored is erased, and the digital audio signal for the next one field is erased.
It can be rewritten as a number. The above operation is repeated every one field period while the write start signal is supplied from the system controller 37 to the field memory control circuit 41.

Next, the case of normal playback will be explained. The recording signal recorded on the magnetic tape is reproduced by the magnetic heads 26a and 26b, passes through the changeover switch 38 and the changeover switch 25, and the reproduced signal is passed through the hunt pass filter 27,
Y signal processing circuit 33, C (supplied to No. 2 processing circuit 34).

Does the band pass filter 27 perform FM modulation? One voice signal is separated, and the separated FM modulated voice signal is demodulated in an FM demodulation circuit 28. FM demodulated playback audio 18
The signal is input to the noise reduction circuit 30 after being corrected for signal loss etc. due to reproduction in the signal correction circuit 29 . The noise reduction circuit 30 reduces noise contained in the reproduced audio signal, and the audio signal amplified by the amplifier 31 is output from the audio signal output terminal 32.

On the other hand, the Y signal processing circuit 33 separates the FM modulated luminance signal from the supplied reproduced signal, performs FM demodulation, etc., and then supplies it to the adder 35.

On the other hand, the C signal processing circuit 34 separates a low frequency converted color signal from the supplied reproduced signal, performs frequency conversion and restoration from the low frequency to the original frequency band, and supplies the signal to an adder 35.

The luminance signal and color signal supplied to the adder 35 are outputted from the image signal output terminal 36 as a summed image signal.

Next, the continuous recording operation in this embodiment will be explained.

FIG. 2 is an explanatory diagram of the operation of FIG. 1. In Figure 2,
Recording tracks m-1 to m are respectively formed on the tape by a recording operation, and H is a magnetic head which travels in the direction shown in the figure during recording and reproduction.

Now, when the recording operation as described in 11 is being performed, when the instruction unit (not shown) instructs the system controller 37 to temporarily stop the recording operation from the terminal C in the figure, the capstan (not shown) stops. The recording operation is interrupted. Then, the changeover switch 25 is switched from the P side to the P side in the figure, and after rewinding the tape by a predetermined amount, the tape stops running and enters a re-recording standby state.

FIG. 2 is a diagram showing the above-mentioned re-recording standby state. To simplify the explanation, the recording tracks, which are normally formed diagonally on the tape, are shown vertically.

In FIG. 2, assuming that the magnetic head H is currently in the re-recording standby state as described above, the magnetic head H is located on the m-1 track on the tape T, for example.

Then, in the instruction unit, the start of the re-recording operation is instructed by the system controller 37 from the terminal C, and the apparatus enters the playback state. Control tracking in direction.

At the same time, the recorded signal recorded on the tape T is reproduced.

Here, when the instruction unit instructs the system controller 37 to temporarily stop the recording operation from the terminal C, the system controller 37 stops supplying the write start signal supplied to the field memory control circuit 41, and The write operation of the field memory circuit 21 is interrupted. In other words, the field memory circuit 21 contains the same audio signal recorded in the final recording track (m in FIG. 2) that was formed immediately before the instruction unit instructed to pause the recording operation. It will be digitized and remembered.

Then, as described above, when the instruction section instructs the system controller 37 from the terminal C to start the re-recording operation, the system controller 37 supplies a read start signal to the field memory control circuit 21.

The field memory control circuit 41 to which the read start signal has been supplied reads out the digital audio signal stored in the field memory circuit 21 in synchronization with the synchronization signal from the synchronization signal generation circuit 40, and converts it to the D/A conversion circuit 22. The signal is converted into an analog audio signal, band-limited by a low pass filter 23, and supplied to a comparison circuit 24. At this time, the synchronizing signal outputted from the synchronization No. 8 generation circuit 40 is No. 15 synchronized with the reproduction period of one track obtained by detecting the rotation period of a capstan (not shown).

On the other hand, the device put into the playback state by the system controller 37 plays back the signal recorded on the recording track of the tape T1 in the same way as the above-mentioned normal double playback. In the reproduction system, the reproduced Ff voice A3''+ output from the noise reduction circuit 30 is supplied to the comparison circuit 24.

The comparison circuit 24 includes the field memory circuit 21 as described above.
Since the audio signal recorded in the final recording track stored in the magnetic heads 26a and 26b is supplied, the reproduced audio signal obtained from each recording track by the magnetic heads 26a and 26b is compared with the audio signal of the final recording track. and its level of error starts. (See FIG. 2E) A threshold level TH is set in advance in the comparator circuit 24, and when the error level is lower than the threshold level TH, the audio signal of the last recording track and the magnetic head 26a,
It is assumed that the reproduced audio signal of the recording track reproduced in step b is the same, and the system controller 37 outputs a recording start command signal. Then, the system controller 37 to which the recording start command signal has been supplied connects the changeover switch to the R side in the figure, and the apparatus returns to the recording state, and continuous recording is performed.

As explained above, according to the present invention, each time a recording track is formed during normal recording, the audio signal recorded on the recording track is stored in the field memory, and is reproduced during continuous recording. Determine the final recording track by comparing it with the audio signal on the recording track,
Accurate continuous shooting can be done by listening to the recording.

In addition, 1) In the embodiment mentioned above, the field memory circuit stores only the voice signal recorded on the final recording track, or the audio signal recorded on multiple tracks including the final recording track is stored. By doing so, it is possible to detect the last recording track even after recording in which a silent state continues.

In this embodiment, the signals stored in the field memory circuit are not limited to audio signals, and even in the case of a configuration in which image signals are stored, the same effects as described above can be obtained.

(Effects) As described above, according to the present invention, it is possible to provide a recording/reproducing apparatus that can perform accurate continuous recording without recording a special index signal or the like on a recording medium.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a schematic configuration of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the operation of FIG. 1.

Claims (1)

[Claims] A storage means for storing some information signals among the information signals recorded on a recording medium, and information signals stored in the storage means and information obtained from the recording medium when the recording medium is reproduced. 1. A recording/reproducing apparatus comprising: a comparing means for comparing the following signals and generating a recording start signal according to the comparison result.