JPS6180602A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain simultaneous recording of plural video signals, e.g., >=2 TV programs by providing video heads by a number twice the number of video signals to be recorded to a rotary head, applying phase and time adjustment and recording the result alternately at each video track. CONSTITUTION:Independent recording video signal processing circuits 13, 14 and video signal recording amplifier circuits 15, 16 are provided to process individually video signals A, B to be recorded. Video heads a1, a2 and b1, b2 are provided to a rotary video head block 11 and the output is recorded as video signals A1, A2 and B1, B2 on a magnetic tape 12. The video signals A, B to be recorded are inputted respectively to synchronizing separator circuits 17, 18, where the vertical synchronizing signal in the signals is extracted and inputted to a synchronizing signal phase difference detecting circuit 19 so as to detect the phase difference between the video signals A and B, a video signal variable delay circuit 20 is activated and the video signal B is retarded time wise from the video signal A so as to allow the vertical synchronizing signal to obtain the standard phase for establishing synchronization.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD The present invention relates to a magnetic recording and reproducing device that is capable of recording and reproducing a plurality of video signals repeatedly.

"Prior Art and its Problems" Conventionally, in order to record a plurality of video signals, a plurality of magnetic recording and reproducing devices (VTR) were required. multiple vtrs
A magnetic tape is loaded into each, and video signals are individually recorded on this magnetic tape. For this reason, T of 2 or more
In order to record V-pictures at the same time, two or more VTRs must be prepared, and in general households, it was virtually impossible to record more than one program. Also, to edit video signals shot simultaneously by multiple TV cameras.

Similarly, multiple VTRs are required, and a large amount of equipment and complicated controls are required, such as adjusting the time using time codes, making it almost impossible for general users to edit VTRs. Met.

``Object of the Invention'' The present invention solves the problems with conventional devices, and provides a magnetic recording and reproducing device that can record multiple video signals on a single magnetic tape with a single device and reproduce the same. The purpose is to obtain.

"Summary of the Invention J The magnetic recording and reproducing apparatus of the present invention uses two rotating heads for recording and reproducing the - video signal in order to be able to simultaneously record and reproduce two or more video signals. In a so-called rotary two-head type VTR, the rotary head is provided with video heads twice as many as the number of video signals to be recorded, and these video signals are adjusted in phase and time to satisfy the recording format of the magnetic tape. The video signal is recorded alternately on each video trunk, and during playback, a plurality of video signals are simultaneously played back from the recorded magnetic tape, and these video signals are synchronized and output. There is.

"Embodiments of the Invention" The present invention will be described below with reference to illustrated embodiments. In this embodiment, A.82 video signals are recorded and played back by one VTR.
As shown in FIG. 2, there are two video heads a1 and A2 for video signal A, and two video heads b for video signal B.
1. b2 is provided. video head a1 and a2)
and video heads b1 and B2 each have an interval of 180
゜separated.

A conventional VTR has video heads al and A2. Or, it uses only the video heads b1 and B2, and uses the so-called azimuth recording method to record the video on the magnetic tape.
The present invention records video signals A1 and A2) by the video heads a1 and A2) or video signals by the video heads b1 and B2 diagonally and alternately. All B1 and B2,
As shown in FIG. 3, recording is performed diagonally and alternately on the video track 21 of the magnetic tape 12.

FIG. 1 is a block diagram of a magnetic recording and reproducing apparatus according to the present invention for recording both video signals A and B as shown in FIG.
and B for each bond, an independent recording video signal processing circuit 13.14 and a video signal recording amplification circuit 15.1 are provided.
6 is provided. In order to record the video signals A and B processed by these onto a single magnetic tape 12, the video signals A and B are sent to the single rotating video head block 11 through video signal recording amplification circuits 15 and 16. input, and in this rotating video head block 11,
To the above video Rado a1. a2) and video rad bl
, b2, video signals Al and A2 are placed on the magnetic tape lz.
) and are recorded as video signals Bl and B2.

However, since video signals A and B to be recorded are generally independent, if video signal A is recorded as a servo reference signal, video signal B will cause the screen to be distorted, such as the switching point of the head appearing on the screen. Put it away.

For this reason, in the present invention, the video signals A and B to be recorded are first input to period separator circuits 17 and 18, respectively, and the vertical synchronization signal in the signals is extracted here. Then, the extracted vertical synchronization signal is input to the synchronization signal phase difference detection circuit 19 to detect the phase difference between the video signals A and B, and depending on the phase difference, the video signal is inserted only into the signal processing circuit on the video signal B side. The signal variable delay circuit 20 is operated. In other words, this video signal variable delay circuit 20 is configured so that when the video signals A and B are recorded on the magnetic tape 12 by the rotating video head block 11, the vertical synchronization signals of the video signals A and B have the standard phase. In other words, the video signal B is delayed in time from the video value No. 1 A so that the video signals A1, A2) B1, B2 are recorded regularly as shown in FIG.

This video signal variable delay circuit 20 converts the video signal from analog to digital, stores it in memory, varies the calling clock, and then performs A/A conversion or passes the analog signal through a delay element such as a CCD. It can be configured by

After the time difference between the video signals A and B is adjusted by the video signal variable delay circuit 20, the video signals A and B are supplied to independent recording video signal processing circuits 13 and 14, where well-known pre-emphasis, FM modulation, etc. are performed. After being amplified by the video signal recording amplification circuits 15 and 16, the signal is recorded on the magnetic tape 2 by the one-rotation video head block 11 as shown in FIG. The rotating video head bronc 11 has a rotating rotary transformer (not shown), a fixed drum, etc., and the video heads a1. a2 and video heads b1 and b2 are fixed.

The magnetic tape 12 contains video signals A1. A2) B1. B2
In addition, as shown in FIG. 3, audio signals are recorded in the audio trunk 22 and control signals are recorded in the control track 23. This audio signal and control signal are recorded by a fixed head, and the control signal is sent to the servo circuit 2 which receives the output of the synchronization signal phase difference detection circuit 19 shown in FIG.
4 and the control head block 25.

The present invention is also applicable to methods in which the audio signal is FM-modulated and recorded over the video track 21, or the control signal is converted into a biront signal and recorded on the video track 21.

Next, the operation during reproduction will be explained with reference to FIG.

Video head a1 of Radblock 11 to rotating video. a
2) By scanning the video track 21 of the recorded magnetic tape 12 with bl and b2, the video signal A1 . A2)
Reproduction signals of B1 and B2 are obtained. This reproduced signal is passed through a rotary transformer to a reproduced video signal preamplifier circuit 26.
．． 27 and amplified. This amplified reproduction signal is further sent to reproduction video signal processing circuits 28 and 29 to become video signals A and B. When it is necessary to synchronize video signals A and B, a video signal delay circuit 30 is inserted into the reproduction circuit for video signal B, and the video signal for video signal B is delayed and output. This video signal delay circuit 30 can be shared by the video signal variable delay circuit 20 during recording.

FIG. 5 shows an example of how the vTRl 00 of the present invention is used, in which an object photographed with a certain parallax is recorded on the VTR 100 of the present invention using two video cameras 31 and 32, and this is simultaneously recorded on the monitor 33. This block is for playback in .34. If you configure the monitors 33 and 34 to have the same configuration as a stereo viewer, you can view each reproduced video with one eye.

It becomes a stereo TV, allowing you to view images with a three-dimensional effect.

The present invention V also uses two video cameras 31 and 32.
To edit using the video signals A and B shot and recorded on the TR100, as shown in FIG.

If the video switcher 35 is connected to the VTR 100 of the present invention so that one of the video signals A and B can be taken out and recorded on another VTR 36, the video signals A and B can be recorded.
Because they are synchronized.

You can easily edit images and sounds.

In the above embodiment, the order of the video signals recorded on the Fa tape 12 was set as the video signals Al-B2→A2→B2.
This can be changed, for example, from video signal AI-A2-hBl to B2 by setting the video signal variable delay circuit 20 or the like. Further, the distance between the video radar a1 and the video radar bl on the rotating drum of the rotating video head block 11 is set to 90'' in the above embodiment, but this interval may be changed depending on the number of different video signals to be recorded, etc. You can change it.

"Effects of the Invention" As described above, according to the magnetic recording/reproducing device of the present invention, a plurality of video signals can be recorded in one device.
Two or more TV programs can be recorded simultaneously. Furthermore, when photographing a single event from different directions in an experiment, etc., it is possible to use one VTR according to the present invention.
Since it can be recorded on a TR, it is economical, and since a reproduced video without time lag can be obtained, analysis becomes easy. Furthermore, editing of these multiple video signals becomes easy, and new fields of use such as stereo television can be easily developed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the magnetic recording/reproducing device of the present invention, FIG. 2 is a plan view showing the arrangement of the video head of a rotating video head block used in the device of the present invention, and FIG. 3 is a block diagram showing an embodiment of the magnetic recording/reproducing device of the present invention. FIG. 4 is a block diagram showing an example of a control system during playback of the device of the present invention, and FIGS. FIG. 2 is a block diagram showing an example of how the device is used. 11...7 block to rotating video, 12...magnetic tape, 13.14...recorded video signal processing circuit, 15
．． 16... Video signal recording amplification circuit, 17.18...
Synchronization separation circuit, 19... Synchronization signal phase difference detection circuit, 2
0...Video signal variable delay circuit, 21...Video track, i o o...VTR of the present invention, al, a2)
bl, b2...video head. Patent Applicant Asahi Optical Co., Ltd. Agent Kunio Miura Shigeru Matsui Figure 4 Teitosei Amendment (Voluntary) December 6, 1980 Commissioner of the Patent Office Manabu Shiga 1. Display of 3S 1981 Patent Application No. 203091 2) Name of the invention Magnetic recording and reproducing device 3, Relationship with the person making the amendment π Patent applicant address 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Name
(052) Asahi Optical Industry Co., Ltd. Representative Matsuki
Imitation 4, Agent Address: 606 Villa Casa Gobancho, 5-5 Gobancho, Chiyoda-ku, Tokyo Telephone: 03 (234) 0290 Name:
(8328) Patent attorney Kunio Miura (1 other person) 5,
Claims column and Detailed Description of the Invention column 6 of the specification to be amended, contents of the amendment (1) The entire text of the claims shall be amended as shown in the attached sheet. (2) The statement ``in the rotating head'' on page 3, line 8 of the specification is corrected to ``in the rotating cylinder.'' A document stating the scope of claims after the above amendments (Japanese Patent Application No. 1983-
No. 203091) (1) In a magnetic recording and reproducing device that records video signals on a magnetic tape using a set of two video heads provided on a rotating cylinder and reproduces the recorded signals, a set of two video heads provided on the rotating cylinder is used. A number of video heads corresponding to the number of video signals to be recorded are provided, and a signal processing circuit that processes multiple video signals individually and supplies them to each set of video heads is provided to synchronize the multiple video signals. 1. A magnetic recording and reproducing apparatus comprising: a video signal delay circuit that delays recording of other signals on a magnetic tape using one video signal as a reference. (2) The magnetic recording and reproducing device according to claim 1, wherein the video signal delay circuit is used to synchronize a plurality of video signals during reproduction.

Claims (2)

[Claims] (1) In a magnetic recording and reproducing device that records video signals on a magnetic tape using a set of two video heads provided on a rotating head and plays back the recorded signals, a set of two video heads provided on the rotating head is used. A number of signal processing circuits are provided corresponding to the number of video signals to be recorded, and furthermore, in order to synchronize the plurality of video signals with a signal processing circuit that individually processes the plurality of video signals and supplies them to each set of video heads, 1. A magnetic recording and reproducing apparatus comprising: a video signal delay circuit that delays recording of other signals on a magnetic tape using one video signal as a reference. (2) The magnetic recording and reproducing device according to claim 1, wherein the video signal delay circuit is used to synchronize a plurality of video signals during reproduction.