JPH03108972A - Video signal recording method - Google Patents

Abstract

PURPOSE:To secure the larger information volume of luminance signals while keeping compatibility with a conventional method by dividing a video track into two and recording the same video signal as conventional on one divided track and changing the azimuth angle to record a video signal, which includes a luminance signal supplementing the luminance signal, on the other. CONSTITUTION:Standard A and standard B video tracks are divided to video tracks A and A' and video tracks B and B' respectively. A and B heads 13 and 15 have the same azimuth angles as a normal A head 11 and a normal B head 12, and A' and B' heads 14 and 16 have different azimuth angles. Video signals of the same kind as video signals recorded by normal A and normal B heads 11 and 12 are recorded on A and B video tracks by A and B heads 13 and 15, and video signals including luminance signal which supplement the luminance signals included in recorded video signals are recorded on A' and B' video tracks by A' and B' heads 14 and 16. Thus, the compatibility with a conventional VTR device is kept and the larger information volume of luminance signals is recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a video signal recording method, and more particularly to a video signal recording method for recording video signals on a videotape using a tilted azimuth recording method.

[Conventional technology]

The mainstream recording method for home video video signals is a high-density single recording method that does not have guard bands between video tracks, due to the combination of the ``slope azimuth recording method'' and the ``color signal processing method using line correlation.'' It has become.

That is, the former removes the crosstalk between each video track of the FM-modulated luminance signal, and the latter removes the crosstalk between each video track of the low-frequency converted chrominance signal. This enables density recording.

[Problem to be solved by the invention]

By the way, in order to improve the image quality, it is necessary to secure a larger amount of information in the video signal, especially the information amount in the luminance signal, but when adopting a new recording method, the conventional V
Compatibility with TR equipment becomes an issue.

The present invention has been made in view of the second situation, and it is an object of the present invention to provide a video signal recording method that can secure a larger amount of information in a luminance signal and is also compatible with conventional VTR equipment. With the goal.

[Means to solve problems]

In order to achieve the above-mentioned object of the present invention, standard A video tracks and standard B video tracks on which video signals are recorded using a tilted azimuth recording method are divided into A and A' video tracks with narrow track widths and B and B' with narrow track widths, respectively. divided into two video tracks, recording video signals of the same type as the video signals recorded on the standard A1 standard B video tracks on the A and B video tracks at the same azimuth angle as the standard A1 standard B video tracks, respectively; In the A' and B' video tracks, a video signal including a luminance signal that supplements the luminance signal included in the video signal recorded on the ASB video track is recorded at an azimuth angle different from that of the adjacent track. It is characterized by the fact that it is made to do so.

[Effect]

According to the present invention, a conventional video track is divided into two, one of the divided video tracks records the same type of video signal as the conventional video signal, and the other video track is recorded with a different azimuth angle. A video signal including a luminance signal supplementing the luminance signal included in the video signal is recorded.

That is, while maintaining compatibility with the conventional method, twice as many tracks are used for the luminance signal to ensure a larger amount of information for the luminance signal.

〔Example〕

Preferred embodiments of the video signal recording system according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a diagram showing the tape format and video head of a video tape recorded by the video signal recording method according to the present invention. In the same figure, 10 is, for example, 81
1I11 video tape, and 11 and 12 are conventional 7-circle A video heads and normal B video heads, respectively, having different azimuth angles. In addition, the A head 13 and the B head
The head 15 has the same azimuth angle as the normal A head 11 and the normal B head 12, and the recording track width is normal.
The A' head 14 and the B' head 16 have azimuth angles different from those of the A head 13 and B head 15, and the recording track width is the same as that of the normal A head 11. , normal B head 12
The video head is half the size of the original.

Here, the A head 13 and the B head 15 record video signals of the same type as those recorded by the normal head III and the normal B head 12 on the A video track and the B head.
Record to video track.

The video signals recorded on the A video track and the B video track can be picked up by the normal A head 11 and the normal B head 12, and the difference between the 8 ml 5 video tape 10 recorded using this method and the normal 8 tap video is Compatible.

On the other hand, the A' head 14 and the B' head 16 send a video signal including a luminance signal that supplements the luminance signal included in the video signal recorded by the A head 13 and B head 15 to the A' video track and the B' video track. This is used to record a larger amount of information in the luminance signal. Incidentally, the luminance signal recorded by the A' herad 14 can be considered to be the luminance signal of the odd field recorded by the eight hedra 13 and the even field in the same screen, and similarly the luminance signal recorded by the B' herad 16. The signal may be a luminance signal of an even field recorded by the B head 15 and an odd field within the same screen.

Next, a video camera employing the above video signal recording method will be described.

In FIG. 2, light incident through a photographic lens 20 is imaged on the light-receiving surface of a CCD solid-state image sensor 22, and is converted into a signal charge of an amount depending on the intensity of the light by each sensor. By increasing the transfer rate and reading out this signal charge,
As shown in FIG. 3A, the video signals are sequentially read out as an odd field (0) video signal and an even field (E) video signal in 1/60 second, and are output to the video signal processing circuit 24.

The video signal processing circuit 24 includes a white balance circuit, a γ correction circuit, a matrix circuit, an encoder circuit, etc., and after performing predetermined signal processing by these circuits, the normal luminance signal Y and color signal C, and the above-mentioned A luminance signal Y and a luminance signal Y' having different fields on the same screen are output.

The luminance signals Y and Y' are respectively output to the recording signal processing circuit 2.
6 and 28, where it is FM modulated and output to summing points 32 and 34. The color signal C is also applied to the recording signal processing circuit 30, where signal processing such as low frequency conversion is performed, and then output to the addition points 32 and 34. Further, at the addition points 32 and 34, four types of pilot signals f, f having a constant frequency in a frequency range lower than the low frequency conversion color signal are sent from the pilot signal generation circuit 36.
2 f3 f4 are added sequentially every 1/60 seconds.

Addition points 32 and 34 add manually input signals, respectively, and send the recorded video signals to A head 13, B head 15, A' head 14, and B' via recording amplifiers 38 and 40.
Output to the head 16. 3B to 3E show recorded video signals applied to the A head 13, the A' head 14, the B head 15, and the B' head 16, respectively. As shown in the figure, the recorded video signal of the odd field (0) is applied to the eight head 13 like the normal A head, and the same recorded video signal applied to the A head 13 is applied to the A' head 14. Recorded video signals of even fields (E) within the screen are added. In addition, the B head 15 has a normal B head.
Similar to the head, an even field (E) is added, and B'
The recording video signal applied to the B head 15 and the recording video signal of the odd field (0) in the same screen are applied to the head 16.

Then, the recording video signal for one frame is added to the head 13 and the head 14 of A', and the head B 15 and the head B'
The recording video signal for one frame that is applied to the head 16 is recorded one frame at a time on the tape 10i as shown in FIG.

As a result, twice as many tracks are recorded for the luminance signal.

On the other hand, during playback, the brightness signal Y and the color signal C can be picked up by the normal head head and B head, but the head head 13, the A' head 14 and the B head 15 mentioned above can be picked up.
The brightness signals Y, Y' and the color signal C can be picked up by the B' head 16 or a head having the same structure. A frame screen can be obtained at once from these luminance signals Y, Y' and color signal C, and the vertical resolution can be improved.

In this embodiment, the track widths of the A track and the A') rack and the B track and the B') rack are made equal, but the track widths may be changed between them.

Furthermore, in this embodiment, the luminance signal Y recorded in the A) rack and B track and the luminance signal Y' of a different field within the same screen are recorded in the A') rack and B') rack. However, the present invention is not limited to this, and for example, a high-frequency or low-frequency luminance signal of the normal luminance signal Y may be recorded.

〔Effect of the invention〕

As described above, the video signal recording method according to the present invention is compatible with conventional VTR equipment and can record a larger amount of information in luminance signals.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the tape format and video head of a video tape used to explain the video signal recording method according to the present invention, and FIG. A block diagram showing an example of a camera, and FIGS. 3(A) to 3(E) are signal waveform diagrams used to explain FIG. 2, respectively. 10...Video tape, 11...Normal A head 1', 12...Normal B head) l, 13
...A spatula)', 14...A'spatula)#,
15...B head, 16...B' head, 2
0...Photographing lens, 22...CCD solid-state image sensor,
24... Video signal processing circuit, 26. 28, 0...recording signal processing circuit.

Claims (1)

[Claims] A standard A video track and a standard B video track on which video signals are recorded using a tilted azimuth recording method are divided into two, A and A' video tracks and B and B' video tracks, each having a narrow track width. , The A and B video tracks contain video signals of the same type as the video signals recorded on the standard A and standard B video tracks,
The video tracks are recorded at the same azimuth angle as the standard A and standard B video tracks, and the A' and B' video tracks contain a luminance signal that supplements the luminance signal contained in the video signals recorded on the A and B video tracks. A video signal recording method characterized in that a signal is recorded at an azimuth angle that is different from the azimuth angle of each adjacent track.