JPH03190387A - Recording and reproducing system - Google Patents

Abstract

PURPOSE:To save number of installed VTRs and the operating tape by recording plural video signals inputted at the same time to one recording medium and extracting and reproducing the signals independently. CONSTITUTION:For example, two input video signals at recording are synchronized by a synchronizing circuit 1 and two video signals whose synchronizing signal positions are arranged at the end of a field (vertical synchronizing signal position) sequentially alternately by using a changeover circuit 3 to send one video signal apparently and the resulting signal is recorded on a magnetic tape 5 at a recording section 4 including a rotary magnetic head cylinder or the like. Then a signal desiring the reproduction in two video signals inputted at recording is extracted sequentially by one field for each field period (multiplexed field period) used at recording and a missing field is interpolated by using the same field information to reproduce sequentially the independent one field (frame). Thus, number of installed VTRs and the operating tape is saved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording/reproducing method suitable for use in a magnetic recording/reproducing device such as a VTR, and more specifically, it relates to a recording/reproducing method suitable for use in a magnetic recording/reproducing device such as a VTR. The present invention relates to a recording and reproducing method capable of simultaneous multi-screen recording, in which a plurality of video signals are simultaneously recorded on a screen, and each of the recorded video signals can be independently reproduced during playback.

[Prior Art] Normally, VTRs cannot record two TV broadcast programs on one magnetic tape at the same time, and if the TV broadcast programs that you want to record overlap at the same time, multiple VTRs must be recorded. However, when there was only one VTR, only one program was recorded.

In addition, the magazine video: VIDEO COMMUNI
CATION MAGAZINE): 1987 1
As described on page 59 of the Monthly issue, in a video disk system that uses liquid crystal glasses to obtain stereoscopic images by utilizing the afterimage effect caused by binocular parallax, a video camera and VTR compatible with the right eye and a left eye A video camera and a VTR compatible with the eye can be used to capture subjects with two cameras and a VTR.
There is a system in which images are recorded simultaneously on two VTRs and recorded on one video disc so that the images taken at the same time are located on adjacent tracks, but even with this known technology,
In order to record two images at the same time, two VTRs were used as described above. Furthermore, the images taken by the two cameras could not be played back individually from the video disc.

[Problems to be Solved by the Invention] As mentioned above, a single conventional VTR cannot record two or more different videos at the same time, so it is not possible to record two TV broadcast programs at the same time. , if two TV broadcast programs you want to record overlap at the same time,
I had no choice but to use one VTR or give up recording on the other. In addition, even for video cameras used for surveillance purposes in stores, ATM locations, etc., it is necessary to attach one dedicated VTR to each camera. Because it is impossible to simultaneously record videos on one VTR), the cost of recording tapes that are used over a long period of time has increased. For this reason, there has been a desire for the emergence of a magnetic recording and reproducing device such as a VTR that can simultaneously record a plurality of videos on one VTR (one tape) at the same time.

The present invention has been made in view of the above points, and its purpose is to be able to simultaneously record a plurality of videos onto one recording medium (for example, a magnetic tape), and to enable individual videos to be recorded simultaneously. It is an object of the present invention to provide a recording and reproducing method suitable for application to a VTR and the like.

[Means for Solving Problem 11] In order to achieve the above object, the recording and reproducing method of the present invention includes a synchronization circuit that matches synchronization signals of a plurality of input video signals, and a synchronization circuit that matches the synchronization signals of a plurality of input video signals. A switching circuit that sequentially switches and transmits a plurality of synchronized video signals using a field switching signal, a recording section that records the output video signal of the switching circuit on a recording medium, and a reproducing video signal recorded on the recording medium. an extraction circuit that extracts one of the plurality of video signals input during recording from among the reproduced video signals played back by the playback unit according to a field switching cycle used during recording; the plurality of input video signals are simultaneously recorded on the recording medium during recording, and the simultaneously recorded video signals are independently recorded during playback. Configured to play.

[Function] During recording, for example, two input video video signals are synchronized by a synchronization circuit, and the two video signals whose synchronization signal positions are aligned are synchronized at the end of the field (vertical synchronization signal position). The signals are sequentially and alternately switched by a switching circuit and sent out as a seemingly single video signal, which is recorded on a magnetic tape by a recording section including a rotating magnetic head cylinder and the like. Therefore, the video signal sent to the recording section is
Since it is equivalent to the case of TR, it is possible to record without malfunctioning, and if the video signal recorded on the magnetic tape is considered as information, it is a multiplex of the above two human-powered video signals (each of which is an alternating signal). (as recorded in the field).

At the time of playback, a video signal is played back from the magnetic tape by the playback section, and from this playback video signal, the one desired to be played out of the two video signals input at the time of recording is determined according to the field period used at the time of recording (the multiplexed field period)
One field is sequentially taken out at each time, and the missing fields are interpolated using the same field information, so that one independent screen (frame) is sequentially reproduced.

By doing so, during playback, it becomes possible to play back simultaneously recorded video signals as independent videos.

[Example] Hereinafter, the recording and reproducing method according to the present invention will be explained using the V shown in Fig. 1.2.
An example applied to TR will be explained. FIG. 1 is a block diagram showing the configuration of a recording processing system, and FIG. 2 is a block diagram showing the configuration of a reproduction processing system.

In this embodiment, as shown in FIG. 1, the case where there are two video inputs is exemplified, and the two mutually asynchronous input video signals A and B are input to the synchronization circuit 1, and are synchronized with each other. It is assumed that the matched video signal A'B'. 2 is a control circuit that takes in the vertical synchronization signal C output from the synchronization circuit 1 and generates a field switching signal; 3 is a recording unit that switches the two synchronized video signals A' and B'; This is a switching circuit that sends out signals to 4. That is,
A switching circuit 3 is switched by a field switching signal from the control circuit 2, and the video signals A' and B' are sequentially and alternately switched from the switching circuit 3 at the end of the field (vertical synchronizing signal position). Apparently 1
The video signal is sent to the recording section 4 as one video signal. The recording unit 4 has a rotary head cylinder, a recording signal processing circuit, etc., which are known in VTRs, and for example, the CH on the cylinder.
The video signal A' is recorded by the magnetic head for I, and the video signal B' is recorded by the magnetic head for CH2 alternately in adjacent tracks of the magnetic tape 5, one field at a time.

As described above, the two video signals A'B' which are alternately sent from the switching circuit 3 to the recording section 4 one field at a time in response to the field switching signal have the same synchronization signal, so the recording section 4 Even if a known general configuration is adopted, the two input video signals A and B input at the same time can be multiplexed and recorded simultaneously on one magnetic tape 5 without any malfunction.

Next, a method of reproducing from the magnetic tape 5 on which the two video signals A' and B' have been recorded as described above will be explained with reference to FIG. The video recording information on the magnetic tape 5 is taken out as a reproduced video signal E and outputted to a reproduction section 6, which has a known rotary head cylinder, reproduction signal processing circuit, etc. in a VTR. This reproduced video signal E is sent to the switch circuit 8 and is also input to the control circuit 7, where the field switching signal F is generated by the control circuit 7.

This field switching signal F controls the switching circuit 8 on and off at the field switching period during recording, and when the switching circuit 8 is closed, the video signal for one field is transferred to the video storage/interpolation circuit 9. It is captured. That is,
The control circuit 7 receives the two video signals A' and B' described above.
The switch circuit 8 is controlled so as to extract only one desired reproduction video signal from the field multiplexed reproduction signals corresponding to the field multiplexed reproduction signals. Then, the video storage/interpolation circuit 9
In this method, the missing fields are interpolated using the same field information to create image information for one normal frame, and by reading this sequentially, the video signals recorded at the same time can be played back independently. Become.

By doing this, it is possible to reproduce two video signals recorded simultaneously on one magnetic tape as independent videos, and also to reproduce the missing fields into one normal frame using the same field information. Since the image is reproduced as image information for the same amount of time, the reproduced image can be obtained without malfunction using an ordinary TV receiver.

Although the present invention has been described above with reference to the illustrated embodiments, it goes without saying that those skilled in the art will be able to make various modifications without departing from the spirit of the present invention. It is also possible to simultaneously record signals on one VTR and play back each video as an independent video, and the present invention is also applicable to video recording and reproducing systems other than VTRs.

[Effects of the Invention] As described above, according to the present invention, a plurality of video signals inputted at the same time can be simultaneously recorded on one recording medium, and each of these can be taken out and played back independently. ,1
You can simultaneously record images of two TV programs broadcast at the same time on one VTR, or record images from two surveillance cameras at the same time.
It is now possible to record simultaneously with two VTRs, greatly improving convenience, and in applications where many surveillance cameras are installed side by side, the number of VTRs installed and tapes used can be reduced, resulting in cost reduction effects. is huge.

[Brief explanation of drawings]

1 and 2 relate to one embodiment of the present invention; FIG. 1 is a block diagram showing the configuration of a recording processing system, and FIG. 2 is a block diagram showing the configuration of a reproduction processing system. 1... Synchronization circuit, 2... Control circuit,
3...Switching circuit, 4...Recording section, 5
...magnetic tape, 6...playback section, 7.
...Control unit, 8...Switch circuit, 9.
...Video memory/interpolation circuit.

Claims (1)

[Claims] 1. A synchronization circuit that matches the synchronization signals of a plurality of input video signals, a switching circuit that sequentially switches and sends out the plurality of video signals synchronized by the synchronization circuit using a field switching signal, and the switching circuit. A recording section that records the output video signal of the circuit on a recording medium, a playback section that plays back the video signal recorded on the recording medium, and field switching used during recording from among the playback video signals played back by the playback section. comprising an extraction circuit that extracts one of the plurality of video signals input during the recording according to a period, and a circuit that interpolates a field missing part of the extracted video signal,
A recording and reproducing method characterized in that during recording, the plurality of input video signals are simultaneously recorded on the recording medium, and during reproducing, the simultaneously recorded video signals are each independently reproduced.