JPS61208985A - Video signal recording device - Google Patents

Abstract

PURPOSE:To make possible the recording of the high accuracy picture of (n) times by time compressing (n) kinds of mutually spatially offset video signals by 1/n and recording them at (n) times of relative speed. CONSTITUTION:The video signals S-1, S-2, that are NTSC system field signals obtained simultaneously by image pickup elements 1, 2, are time compressed by a time bass converter by 1/2 after signal processing and are recorded on a magnetic tape through rotary heads A, B. At this time, the heads A, B are revolved at 3,600rpm, that is, twice revolution number so that the magnetic tape is made to travel at the standard mode with the track pitch equal to 1/2. At the reproduction, the reading is executed at the revolution number 3,600rpm of the heads A, B in recording and while tendeding the time with twice by the time base converter pararrel signals corresponding to NTSC are obtd. thereafter the signals S-1, S-2 are obtd. by signal processing part. By this, it is possible to make the twice high accuracy image recording.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video signal recording device that is capable of recording high-definition video signals.

[Conventional technology]

FIG. 4 is a block diagram showing a general recording system of a conventional video tape recorder (VTR).
2 is an image sensor, and 3 is a changeover switch.

In a conventional VTR, the two signals obtained by the image sensor 1 and 2 are directly used as one field's worth of video signals, and these two signals are alternately switched by a changeover switch 3 to form one frame of video signal. , each field was recorded on one helical track.

[Problem that the invention seeks to solve]

Conventional VTRs such as those described above have a video signal recording bandwidth of approximately AMHX, and cannot record high-definition images. In addition, no-interlace Extended (hereinafter H
D) monitor TV (for example, NTSC!, 5
25 no interlace, 1O50 interlace) signals could not be recorded.

This invention was made to solve these problems, and at the same time enables the recording of high-definition video signals.
It is an object of the present invention to provide a video signal recording device that is also compatible with conventional devices.

[Failure to solve the problem]

The video signal recording apparatus according to the present invention is provided with a mode in which n types of video signals spatially offset from each other are time-compressed to 1/n and recorded at n times the relative speed.

[Effect]

In this invention, it is possible to record n times more information by compressing the time axes of multiple types of video signals that are spatially offset from each other to l/n and adding a recording mode at n times the relative speed. This enables compatibility with conventional equipment.

〔Example〕

1 and 2 are block diagrams showing one embodiment of the present invention, 1 and 2 are the same as in FIG. 4, and hereinafter, N
The case of TSo/double definition will be explained. Also, the third
The figure is a spatially offset pixel arrangement diagram, in which "○" indicates a portion obtained by the image sensor 1 and "X" indicates a portion obtained by the image sensor 2.

In a VTR configured as shown in FIGS. 1 and 2, video signals S-1 and S- obtained simultaneously from image sensors 1 and 2
2 is an NT80 field signal, which is subjected to signal processing in the same way as a conventional VTR, compressed in time by a time axis converter into a difference, and recorded on a magnetic tape via heads A and B.

At this time, the rotary head rotates at twice the number of revolutions (1800
If the magnetic tape is rotated at a speed of
For VTRs using this method, the diameter is 29 μm). Also, the recorded tape format is the same as before, except for the track width. During playback, the rotational speed of rotary heads A and B is 3600 rpm, the same as during recording, as shown in Figure 2.
Read out with m, expand the time by twice with a time axis converter, and read with N
Obtain parallel signals conforming to TSC. These are conventional VTRs
It is processed in the signal processing section in the same way as S-1°S-2. This video signal is S-1 and S-2 is '0' in Figure 3.
, ′×” are interpolated by the interpolation unit, respectively, to obtain an interlaced video output.

Also, to obtain non-interlaced video output, S-1, S
-2 is compressed every horizontal scanning period using a time axis converter,
Convert to time series signal.

When you want to record in the conventional mode, as shown in Figure 4, the video signals S-1 and S-2 obtained from the camera section are switched field by field to match the conventional tape speed and the conventional rotary head. It is sufficient to record the video signal at the rotational speed.

With the above configuration, even when reproducing this high-definition recorded video signal with the conventional device, if adjacent tracks have different anomalous angles, the O signal and the
Compatibility is completely satisfied as long as the signals are taken out alternately field by field.

〔Effect of the invention〕

As described above, the present invention is capable of recording n times higher resolution images by compressing n types of video signals spatially offset from each other to 1/nlc time and recording them at approximately n times higher relative speed. This has the effect of providing compatibility with conventional devices.

[Brief explanation of the drawing]

FIG. 1 is a block diagram fully explaining the high-definition recording mode (second mode) of an apparatus according to an embodiment of the present invention, and FIG.
FIG. 3 is a block diagram illustrating a high-definition reproduction mode of the apparatus shown in the figure, FIG. 3 is a diagram showing an example of spatial offset of an image sensor, and FIG. 4 is a block diagram showing recording in a conventional apparatus. In the figure, 1 and 2 are image sensors, 3 is a changeover switch, and A
, B are heads, respectively. Agent Patent Attorney 1) Haru Kitatake Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] This device sequentially records video signals on one track for each field, and has a first mode in which one type of video signal is recorded, and a first mode in which n types of video signals spatially offset from each other are recorded at 1/n. and a second mode for recording at a relative speed n times that of the first mode.