JPH01268274A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To simultaneously record two television signals with one device and to select one of the television signals at the time of reproducing by obtaining a reproducing television signal from the output of a second switch and the output of the third switch. CONSTITUTION:A recording and reproducing device equips input terminals 16-19, a video signal synchronizing circuit 20, switches 21, 23 and 24, a delay circuit 22, pseudo-vertical synchronizing signal inserting circuit 25 and input terminals 26 and 27. A part to be surrounded by a broken line is same as the conventional VTR of a VHS system. The reproducing television signal is obtained from the output of the second switch 23 and the output of the third switch 24. Thus, only by a little circuit to the conventional VTR, the VTR can be obtained to record the two television signals simultaneously with one device and to select one of the television signals at the time of the reproducing.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording and reproducing apparatus for television signals consisting of video signals and audio signals.

2. Description of the Related Art Conventionally, a video tape recorder (hereinafter referred to as VTR) is a typical recording and reproducing device for television signals.
There is.

An example of a conventional VTR will be described below with reference to the drawings.

FIG. 3 is a block diagram of a VH8 type VTR. Second
In the figure, 1.2 and 3 are input terminals, 4 is a video signal recording processing circuit, 6 is an audio signal recording processing circuit 3, 6 and 7 are switches, 8 and 9 are magnetic heads,
1o is a magnetic tape, 11 is a video signal reproduction processing circuit, 12
13, 14 and 15 are output terminals. Further, FIG. 3 is an explanatory diagram showing frequency allocation in the VH3 system.

Regarding the VH8 system VTR configured as described above,
The operation will be explained below.

In FIG. 2, a video signal consisting of a luminance signal and a color signal is input from an input terminal 1. Video signal recording processing circuit 4
The luminance signal and the color signal are frequency-converted and frequency-multiplexed into an FM luminance signal and a low frequency converted color signal, and then recorded on the magnetic tape 10 via the switch 6 and the magnetic head 8. On the other hand, the stereo audio signals inputted from the input terminals 2 and 3 are converted into FM audio signals by the audio signal recording processing circuit 5.
The data is recorded on the magnetic tape 1o via the switch 7 and the magnetic head 9. Here, the FM audio signal has a longer wavelength than the FM brightness signal and -9'' degree signal, and is recorded on the tape exploration section.
Since the M luminance signal has a short wavelength, it is recorded on the surface layer of the tape. In addition, since the low frequency conversion color signal is recorded at a low recording level, it is recorded on the surface layer and does not affect the audio much.

During playback, the reverse conversion of recording is performed, and a video signal is output from the output terminal 13, and stereo audio signals are output from the output terminals 14 and 16.

Problems to be Solved by the Invention However, with the above-described configuration, only one television signal can be recorded with one VTR, and two VTRs are required to record two television signals at the same time. There is a problem with this.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a recording/reproducing apparatus which can simultaneously record two television signals on one unit and select one of the television signals at the time of reproduction.

Means for Solving the Problems In order to solve the above problems, the recording and reproducing apparatus of the present invention includes:
a synchronization circuit that synchronizes two video signals; a first switch that alternately selects and outputs the two video signals synchronized by the synchronization circuit at predetermined time intervals; A video and signal recording processing circuit that performs recording processing on the output and records it on a recording medium, an audio signal recording processing circuit that performs recording processing on two audio signals and records them on the recording medium, and a signal obtained from the recording medium. a video signal reproduction processing circuit that performs reproduction processing to obtain a video signal; a delay circuit that delays the output of the video signal processing circuit by a predetermined time; an output of the video signal reproduction processing circuit; and an output of the delay circuit. an audio signal reproduction processing circuit that performs reproduction processing on a signal obtained from a recording medium to obtain two audio signals, and the audio signal reproduction processing a third switch for selecting and outputting one of the two audio signals obtained by the circuit, and obtaining a reproduced television signal from the output of the second switch and the output of the third switch. It is characterized by the following.

According to the present invention, with the above-described configuration, it is possible to realize a recording/reproducing apparatus that can simultaneously record two television signals on a single unit and select one of the television signals at the time of reproduction.

Embodiment Hereinafter, a recording/reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an example in which the present invention is implemented in a VH8 type VTR. In Figure 1, 16.17.1
8 and 19 are input terminals, 2o is a video signal synchronization circuit, 21
．． 23 and 24 are switches, 22 is a delay circuit, 25 is a pseudo vertical synchronization signal insertion circuit, and 29 and 27 are output terminals. Further, the portion surrounded by the broken line is the same as the conventional VH8 system VTR shown in FIG.

The operation of the T/TR configured as described above will be described below. The first and second video signals are input to the input terminals 16 and 18, respectively, and the video signal synchronization circuit 2
0, the vertical synchronization, horizontal synchronization, and color subcarrier synchronization can be matched. Switch 21 is video signal synchronization circuit 2
Two video signals synchronized with 0 and 0 are alternately selected for each field.

The first video signal is then supplied to the video signal recording processing circuit 4 for even fields and the second video signal for odd fields. - side, input terminals 17 and 19
The first and second monaural audio signals are respectively supplied from the audio signal recording processing circuit 5 to the audio signal recording processing circuit 5.

During playback, the video signal playback processing device 11 outputs the first and second signals.
video signals are output alternately for each field. (L
L) The first video signal is transmitted to the delay circuit 22 and the switch 2 in the even field, and the second video signal is transmitted in the odd field.
3. The delay circuit 22 converts the video signal into 2e2H (
1H is delayed by one horizontal scanning time) and is supplied to the switch 23. (b) The switch 23 is a for each field.
b is alternately selected and output. Here, the first video signal can be obtained by controlling the switch 23 so that a is selected in the even field and b is selected in the odd field.

Conversely, if the switch 23 is controlled so that b is selected for even fields and a is selected for odd fields, a second video signal is obtained. After a pseudo vertical synchronizing signal is inserted into the output of the switch 23 by a pseudo vertical synchronizing signal insertion circuit 25,
It is output from the output terminal 26. On the other hand, the first and second monaural audio signals are supplied from the audio signal reproduction processing circuit 12 to the switch 24 , one of which is selected by the switch 24 and outputted from the output terminal 27 .

As described above, this embodiment includes a synchronization circuit that synchronizes two video signals, and a first switch that alternately selects and outputs the two video signals synchronized by the synchronization circuit at predetermined time intervals. , a video signal recording processing circuit that performs recording processing on the output of the first switch and records it on a recording medium; an audio signal recording processing circuit that performs recording processing on two audio signals and records them on the recording medium; and a recording medium. a video signal reproduction processing circuit that performs reproduction processing on a signal obtained by the above to obtain a video signal, a delay circuit that delays the output of the video signal reproduction processing circuit by a predetermined time, and a delay circuit that delays the output of the video signal reproduction processing circuit and the a second switch that alternately selects and outputs the output of the delay circuit at predetermined time intervals; and an audio signal reproduction processing circuit that performs reproduction processing on the signal obtained from the 9-page recording medium to obtain two audio signals. , a third switch that selects and outputs one of the two audio signals obtained by the audio signal reproduction processing circuit;
By obtaining the reproduced television signal from the output of the switch and the output of the third switch, it is possible to record two television signals simultaneously on a conventional VTR by simply adding a few circuits to the conventional VTR. (This makes it possible to realize a VTR that can select one of the television signals during playback.

Effects of the Invention As described above, according to the present invention, it is possible to realize at low cost a recording and reproducing apparatus that can simultaneously record two television signals on one unit and select one of the television signals during reproduction.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the recording/reproducing apparatus of the present invention, FIG. 2 is a block diagram of a conventional V)Is system VTR, and FIG. 3 is a block diagram showing the frequency allocation of the VH8 system. It is an explanatory diagram. 16.17, 18.19... Input terminal, 20.
...Video signal synchronization circuit, 21.23.24...
...Switch, 22...Delay circuit, 25...
...Pseudo vertical synchronization signal insertion circuit, 26.27...
...Output terminal. Name of agent: Patent attorney Toshio Nakao and one other person
.

Claims (1)

[Claims] A recording/playback device that records two television signals consisting of a video signal and an audio signal, and selects and outputs one of the television signals during playback, the device comprising a synchronization circuit for synchronizing the two video signals, and a pre-synchronization circuit. a first switch that alternately selects and outputs two synchronized video signals at predetermined time intervals; and a video signal recording process that performs recording processing on the output of the first switch and records it on a recording medium. circuit and
an audio signal recording processing circuit that performs recording processing on two audio signals and records them on a recording medium; a video signal reproduction processing circuit that performs reproduction processing on a signal obtained from the recording medium to obtain a video signal; and the video signal reproduction processing circuit. a delay circuit that delays the output of the circuit by a predetermined time; a second switch that alternately selects and outputs the output of the video signal reproduction processing circuit and the output of the delay circuit at predetermined time intervals; and a recording medium. an audio signal reproduction processing circuit that performs reproduction processing on a signal obtained by the above to obtain two audio signals; and a third switch that selects and outputs one of the two audio signals obtained by the audio signal reproduction processing circuit. A recording/reproducing apparatus comprising: a recording/reproducing apparatus configured to obtain a reproduced television signal from the output of the second switch and the output of the third switch.