JPS6339284A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To see continuous reproduced pictures by sampling and interpolating the signals on a magnetic tape at the time of reproduction by converting any one of video signals whose synchronisms are different into a digital signal to be stored in a storage means and sequentially switching more than two different video signals on the magnetic tape so as to be continuously recorded. CONSTITUTION:At the time of recording, odd and even fields A1 and A1' in an A channel video signal are added in a signal process circuit 6 with a switching switch 5 and the video signal is modulated to an FM record signal and amplified in a record amplifier 7 to be recorded on a tape. During and before above mentioned actions the signals B0 and B0' of a B channel before A1 and A1' are written in a memory circuit(video RAM) 105 through an A/D conversion circuit 104. Next, as soon as the write action of the signals such as the A1 and A1' on a magnetic tape is completed, the signals B0 and B0' are impressed in the video head of a rotary drum 101 by referring the synchronizing signal of a channel (a) and recorded on the tape. As a result the information signal of the channels (a) and (b) is removed every one frame and the information of (a) and (b) two channels is alternately and continuously recorded on the magnetic tape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording device that records two or more different television signals while sampling them.

[Conventional technology]

Since there is no prior art that corresponds to this invention, I will cite a VTR (Videochi 7" recorder) having a field memory circuit as an example (commercially available as Desotal Video). In FIG. 101 is a rotating drum having a rotating head; 102 is a head amplifier that amplifies a minute signal from the video head; the video head signal (FM signal) amplified by this head amplifier 102 is demodulated by a signal processing circuit 103; The video signal, which is an analog signal, is converted into a digital signal by an A/D (analog/differential) conversion circuit 104.

The output of the A/D conversion circuit 104 is sent to a memory circuit 105. This memory circuit 105 stores the digital video signal converted by the A/D conversion circuit 104 on a field-by-field or frame-by-frame basis, and its output iiD/A (differential/analog) conversion circuit 10
6, where the deisotal video signal is converted into an analog video signal and outputted to an output terminal 108.

These A/D conversion circuit 104, memory circuit 105, D
/A conversion circuit 106 sampling.

The timing of processing the deisotal signal is determined by the memory control circuit 1.
07, and this memory control circuit 107 is generally composed of a P-) array.

On the other hand, the output of the deck sequence control circuit 113 is outputted to the memory control circuit 107, the special reproduction circuit 114, and the servo circuit 112.

This deck sequence control circuit 113 controls the sequence of the entire deck, and the special playback circuit 114 controls tape running when performing special playback such as stay or slow.

The servo circuit 112 receives the outputs from the special reproduction circuit 114 and the deck sequence control circuit 113 to control the rotational speed of both the drum and the capstan, and its output is transmitted to the capstan motor drive circuit 111,
The signal is output to the drum motor drive circuit 110.

The output of the cap stan motor drive circuit 111 drives the cap stan motor 109 and the drum motor drive circuit 1
10 drives a rotating drum 101.

Next, the operation will be explained. Now, when the playback mode is instructed by the operation button, the tape is loaded by the deck sequence control circuit 113, and the servo circuit 11
The cap stan motor drive circuit 111 and the drum motor drive circuit 110 are driven by the output of 2, thereby driving the cap stan motor 109 and the rotating drum 101, respectively, and rotate stably at a predetermined speed.

Here, a rotating drum 10 whose rotational speed and rotational phase are fully controlled.
The video signal picked up by the video head on 1 is amplified by video amplifier 102, and then sent to signal processing circuit 1.
At step 03, the FM signal is demodulated into a video signal.

Of course, this demodulated reproduced video signal may be used as it is as a video signal, but here, the video signal, which is an analog signal, is converted to a deisotal signal by the A/D conversion circuit 10.
Converted in 4.

This deisotal video signal, which is generally converted in 6 to 8 bits, is once stored in a memory circuit 105 consisting of 5 x 256 KRAMs, and further converted into an analog signal by this deisotal signal kD/A conversion circuit 106, and then output. A video signal, which is an analog signal, is output to the terminal 108 (of course, the number of bits for A/D conversion and the memory size may vary, but in general, in order to reduce deterioration in image quality, a 6-bit A/D, D/A conversion and 256 KR
It requires a size of 5 AMXs, and if a frame memory method is used, it requires twice as much memory as a field memory).

These digital processes are generally performed by a memory control circuit 107 that performs sampling processing at a clock frequency of 14 MHz.
r- consisting of 3000 to 4000 f-
Consists of a torray.

Generally, during playback, it is not necessary to operate the A/D conversion circuit 104, memory circuit 105, D/A conversion circuit 106, and memory control circuit 107, but during stay and slow operation, the special playback circuit 14 and the memory circuit By the operation 105, the contents of the memory can be recalled, and a stem model image or a slow image with high quality can be easily obtained.

That is, when the running tape is stopped or is run intermittently, the video signal is stored in field memory during field playback (the moment when the video head normally traces one field on the magnetic tape), thereby producing a stem image, Slow images can be of good quality without noise.

[Problem that the invention seeks to solve]

Since the conventional video signal deisotal processing VTR device is configured as described above, the field memory circuit operates only during playback (in terms of necessity, only during special playback mode), and the field memory circuit operates during recording mode. It was unnecessary.

In addition, conventional VTR devices record one video signal continuously, and if two or more different video signals (
When attempting to record unsynchronized video signals, two or more VTRs were required.

This invention was made to solve this problem, and it is possible to simultaneously record two or more unsynchronized video signals on a continuous tape format field by field or frame by frame, and when playing back two or more video signals on this tape. The object of the present invention is to obtain a magnetic recording and reproducing device that can sample and interpolate signals and view continuously reproduced images.

[Means for solving problems]

The magnetic recording and reproducing apparatus according to the present invention includes means for converting one of the video signals with different synchronization into a deisotal signal and storing it in a memory means, and a means for reading the video signal in synchronization with the synchronization signal of the other video signal and recording the deisotal signal on the magnetic tape. The apparatus is provided with means for sequentially switching and continuously recording two or more video signals.

[For production]

In this invention, two or more different video signals are sequentially and continuously alternately recorded by the operation of the field memory circuit, and during reproduction, the signals on the tape are sampled and interpolated to be continuously reproduced.

〔Example〕

Embodiments of the magnetic recording/reproducing apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment. In FIG. 1, parts that are the same as those in FIG. 3 are given the same reference numerals, and a description of the structure thereof will be omitted, and the parts that are different from those in FIG. 3 will be mainly described.

As is clear from comparing Figure 1 with Figure 3,
In the figure, parts indicated by numerals 101 to 114 are the same as in FIG. 3. That is, in FIG. 1, the following parts are added to the configuration in FIG. 3.

In FIG. 1, it is assumed that la and lb are tuners that receive television signals, and that tuners 1a and 1b receive different channels. The output of the tuner 1 a e 1 b is output to a video amplifier 3 a r3 b which amplifies the video signal via a video intermediate frequency amplifier and a video detection circuit 2 a + 2 b.

The output of the video amplifier 3a is applied to the fixed terminal 8A1 of the changeover switch 8A and is also output to the sync separation circuit 4a, and the output of the video amplifier 3b is output to the A/D conversion circuit 104 and the sync separation circuit 4b. It looks like this.

These synchronization separation circuits 4 a + 4 b each extract a synchronization signal from the video signal amplified by the video amplifiers 3 a + 3 b, shape the waveform, and output it to the memory control circuit 107 . In this case, the synchronous separation circuit 4a
The output of the synchronization separation circuit 4b becomes a calling signal, and the output of the synchronization separation circuit 4b becomes a writing signal.

Further, the output of the signal processing circuit 103 is sent to the A/D conversion circuit 104 and is also applied to the fixed terminal 8A2 of the changeover switch 8A. This changeover switch 8A performs a changeover operation to operate the video head of the rotating drum 101 in recording mode or playback mode, and its movable terminal 8A3 is connected to the fixed terminal 5a of the changeover switch 5. .

The changeover switch 5 is a switch for switching between the video signal of channel a (analog video signal) and the digitally processed video signal of channel b, and its fixed terminal 5b is connected to D.
/ A, connected to the output terminal of the conversion circuit 106, movable "
The terminal 5c is connected to a movable terminal 8B3 of the changeover switch 8B.

Fixed terminal 8B2 of changeover switch 8B is D/A conversion circuit 1
The fixed terminal 8B1 is connected to the fixed terminal 8C1 of the changeover switch 8C via the signal processing circuit 6 and the recording amplifier 7.

The signal processing circuit 6 modulates the video signal -(i=FM recording signal), and the recording amplifier 7 amplifies the FM modulation signal.

Changeover switch 8C fixed terminal 8C2H head amplifier 10
20 input terminal, and the movable terminal 8C3 is connected to the rotary drum 1
01.

The changeover switches 8A to 8C are interlocked to operate the video head of the rotating drum 101 in a recording mode or in a reproduction mode.

Next, a description will be given with reference to FIG. 2 showing the tape format. First, two tuners 1a + 1b receive different television signals, and input them to a video intermediate frequency amplifier and a video detection circuit 2a, 2b.
When the signals are detected, a video signal that is completely different from the synchronization signal and the video signal is obtained at the video amplifiers 3a + 3b. This state is shown in FIG. 2(C) and FIG. 2(d).

Here, An + A'n each indicates a field of the A channel video signal, where An indicates an odd field and A'n indicates an even field.

Similarly, Bn r B'n indicates the odd field and even field of the B channel video signal. As shown in FIG. 2(C) and FIG. 2(d), the A channel and B channel are not synchronized.

Therefore, first, when recording, the AI, A'lk changeover switch 5
In addition to the signal processing circuit 6, the video signal k is modulated into a FM recording signal, amplified by the recording amplifier 7, and then applied to the rotary head 101 via the changeover switch 8C to convert it into a conventional VT.
Record it on tape in the same way as R.

During and before this time, the A, A', and previous B channel signals BOIB'O are written into the memory circuit 105 (video RAM) through the A/D conversion circuit 104.

This is done by operating the memory control circuit 107 based on the synchronization signal from the synchronization separation circuit 4b.

That is, the video signal amplified by the video amplifier 3b is applied to the memory control circuit 107 using a signal obtained by extracting the synchronization signal by the synchronization separation circuit 4b as a write signal, and thereby the memory control circuit 107 is connected to the A/D conversion circuit 104.
, controls the memory circuit 105, converts the video signal amplified by the video amplifier 3b into a digital signal by the A/D conversion circuit 104, and writes it into the memory circuit 105.

Next, at the same time as the writing operation of the signal AI + A'l to the magnetic tape is completed, this memory circuit 105
signal B. , based on the synchronization signal of B101 channel a, it is sent to the changeover switch 8B via the D/A conversion circuit 106, and sent to the video head of the rotating drum 101 via the signal processing circuit 6, the recording amplifier 7, and the changeover switch 80e. applied and recorded on tape.

The calling timing at this time is based on the synchronization signal of channel a separated by the synchronization separation circuit 4a, and the memory control circuit 107, memory circuit 105, and D/A conversion circuit 10
6 operates, and as shown in FIG. 2(b), A, A',
Each field of BoB'o is transmitted successively.

Such operations are performed continuously as shown in FIG. 2(b), and the information signal of channel ayb is removed frame by frame on the magnetic tape as shown in FIG. 2(a).
r b The information of the two channels is recorded alternately and consecutively.

The tape format recorded on this magnetic tape is the same as one continuous channel recorded, but
The content is that channels a and b are mixed in each frame.

Next, during playback, the changeover switches 8A to 8C come into contact with the playback side, and the signal passes through the changeover switch 8C head amplifier 102 and playback signal processing circuit 103 to become a playback video signal.

These video signals A and A' are first switched to the selector switch 8A.

Output terminal 1 via changeover switch 5 and changeover switch 8B
08 as a video output signal, and at the same time, the A/D conversion circuit 104 and memory circuit 105 output the video signals A and A'.
, and converts the video signal A'I to the D/A conversion circuit 106.
At the same time, the video signal A1 stored in the memory circuit 106 is converted to analog and sent to the output terminal 108.
A'1 is sent to the output terminal 108 via the D/A conversion circuit 106. That is, as shown in FIG. 2(e), A,
The same is true when reproducing a channel b signal in which frames A', A, A' are repeated twice. In this case, it becomes as shown in FIG. 2(f). Of course channel a.

The selection of b depends on the user's will.

In addition, in the above embodiment, TVZON (No. i A) is used.

Although the explanation has been given using the case of two B as an example, two or more cases such as ABC... can be recorded in exactly the same way. However, as a matter of course, the frame or field resolution is progressively inferior.

The memory circuit 105 may be a field memory or a frame memory, but a frame memory is required when recording and reproducing operations are performed in units of frames as shown in FIG.
In this case, typically twice as much video RAM is required as compared to field memory.

When configured with field memory, A, A, Bo
Bo As As B2 B2 AS AS B4 B
4''. The two fields perform recording and reproducing operations using exactly the same signal.

In the above explanation, two tuners a and b are selected, but this is for the sake of easy understanding, and includes all cases where the two video signals are not synchronized.

The functions in the conventional special playback field shown in FIG. 3 are not directly related to the present invention, and the configuration shown in FIG. 1 can produce special playback effects in exactly the same way. Therefore, as shown in FIG. 3, a VTR that already has a field memory or frame memory
Now, this invention can be implemented without increasing costs.

〔Effect of the invention〕

As explained above, the present invention converts one of the video signals with different synchronization into a deisotal signal, stores it in the storage means, and reads it in synchronization with the synchronization signal of the other video signal to record the two on a magnetic tape. Since the above different video signals are sequentially switched and recorded continuously, it is possible to record two or more video signals simultaneously while sampling each field or frame, and when playing back, the signals on the magnetic tape can be sampled and recorded. It is possible to interpolate and view continuous playback images, so one VTR
For example, you can record baseball and drama programs being broadcast at the same time, and then later enjoy playing one of them consecutively.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the magnetic recording/reproducing device of the present invention, FIG. 2 is a diagram showing the format of a magnetic tape for explaining the operation of the magnetic recording/reproducing device, and FIG. 3 is a diagram of a conventional magnetic tape format. VTR with memory or frame memory
FIG. 2 is a block diagram showing the configuration of FIG. 1 a + 1 b...tuner, 2 a t 2
b...Video intermediate frequency amplifier and video detection circuit, 4 a
J4b...Synchronization separation circuit, 5.8A~8C...
Selector switch, 6゜103...Signal processing circuit, 101
... Rotating drum, 104 ... A/D conversion circuit, 10
5...Memory circuit, 106...D/A conversion circuit, 1
07... Memory control circuit, 109... Capstan motor, 110... Drum motor drive circuit, 111
...Cap stan motor drive circuit, 112...Ser circuit, 113...Deck sequence control circuit, 1
14...Special regeneration circuit. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] Means for storing a television signal of a predetermined first channel of a plurality of channels on a magnetic tape field by field or frame by frame, while the television signal of the first channel is being written on the magnetic tape; means for previously writing the television signal of a predetermined second channel into the memory means with reference to its synchronization signal; means for storing the television signal of a second channel stored in the memory means on the magnetic tape field by field or frame by frame with reference to the synchronization signal of the television signal of the channel; a magnetic recording/reproducing apparatus comprising: means for outputting television signals of first and second channels in an arbitrary selection order; and means for storing the television signals in the memory means and outputting the same after being stored in the memory means.