JPH0775133A - Stereoscopic image recording and reproducing device - Google Patents

Abstract

PURPOSE:To perform the recording and reproducing of a stereoscopic image while keeping the compatibility with a conventional VTR. CONSTITUTION:At the time of recording, a right eye video signal R is separated into a luminance signal Yr and a chrominance signal Cr by a YC separation circuit 1, the signal Yr is FM modulated by a first FM modulation circuit 2 and the signal Cr is passed through a low frequency conversion circuit 3 and added by an adder 4. Difference Yl-Yr at a subtracter 6 between separated luminance signals Yl and Yr of a left eye video signal L is passed through a band pass filter 7, FM modulated later at a frequency higher than that of the first FM modulation circuit by a second FM modulation circuit 8, mixed with a main channel by the adder 4 and recorded later. At the time of reproducing, the signal is separated into the chrominance signal Cr, luminance signal Yr and difference Yl-Yr by a frequency separation circuit 13, the signal Cr is converted to an original carrier chrominance signal by a high frequency conversion circuit 14, the signal Yr is demodulated by a first FM demodulation circuit 15 and added to the signal Cr by an adder 16, and the right eye video signal R is provided. The difference Yl-Yr is passed through a second FM demodulation circuit 17 and an adder 18 and turned to the luminance signal Yl, further, the signal Cr is added by an adder 19, and the left eye video signal L is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image recording apparatus and stereoscopic image reproducing apparatus capable of recording a right eye signal and a left eye signal having parallax while maintaining compatibility with a conventional VTR.

[0002]

2. Description of the Related Art Conventionally, as a method of recording a stereoscopic image with a tape pattern compatible with a normal VTR, as described in JP-A-62-236294, a main signal ( Right or left eye video signal),
There is a method of recording left and right parallax signals in the overlap portion.

According to this method, when reproducing by a conventional VTR, a monaural image can be obtained by reproducing a track in a 180 ° section, and a stereoscopic image can be obtained by reproducing by a VTR according to this method.

[0004]

However, the above method has a drawback that it can be applied only to a VTR having a recording format having an overlapping portion, and cannot be applied to, for example, the VHS standard.

The present invention provides a stereoscopic image recording apparatus and a stereoscopic image reproducing apparatus that solve the above-mentioned drawbacks.

[0006]

According to the present invention, there is provided first conversion means for converting a right-eye video signal or a left-eye video signal into a first frequency band, and a parallax signal for a right eye and a left eye more than the first frequency band. A stereoscopic image recording apparatus comprising: a second conversion means for converting to a second high frequency band; and a recording means for multiplexing the output of the first conversion means and the output of the second conversion means and recording them on the same track. is there.

In the present invention, the right-eye video signal or the left-eye video signal is converted into a first frequency band as a main channel signal, and the difference between the right-eye video signal and the left-eye video signal is used as a sub-channel signal. In a stereoscopic image reproducing apparatus which converts a signal into a second frequency band higher than the band and frequency-multiplexes these signals to reproduce a signal recorded on the same track of the magnetic tape, frequency multiplexing from the same track on the magnetic tape is performed. Reproduction means for reproducing the reproduced signal, frequency separation means for frequency-separating the reproduction means output into the main channel signal and the sub-channel signal, and the right-eye video signal from the frequency-separated main channel signal and the sub-channel signal And a means for obtaining a left-eye video signal.

[0008]

In the present invention, the right-eye video signal or the left-eye video signal is recorded as the main signal in the same first frequency band as the band of the current VTR, and the parallax signal is recorded in the second frequency band higher than this. Since it is recorded in multiplex, compatibility with the current VTR is maintained.

[0009]

EXAMPLE An example in which the present invention is applied to a three-dimensional VTR compatible with the VHS standard will be described below.

FIG. 1 shows a block diagram of a stereoscopic VTR in this embodiment. In this embodiment, the right-eye video signal R is the main channel, and the difference signal LR between the right-eye video signal R and the left-eye video signal L is the sub-channel.

First, during recording, the right-eye video signal R is separated by the YC separation circuit 1 into a luminance signal Yr and a color signal Cr. The luminance signal Yr has a center frequency of 3.
FM modulation is performed at 9 MHz and a frequency shift of 1 MHz. Further, the color signal Cr is 3.58 MHz in the low frequency conversion circuit 3.
To 629 kHz, and the sum is added by the adder 4. The circuit configuration up to this point is exactly the same as the conventional VHS system.

On the other hand, the left-eye video signal L is YC separated by the YC separation circuit 5. The separated luminance signal Yl is subtracted from the luminance signal Yr by the subtracter 6 to obtain a difference (Y1-Yr). This difference (Yl-Yr) is supplied to the second FM modulation circuit 8 after passing through the bandpass filter 7, and the center frequency 8MH.
z, FM modulation is performed with a frequency shift of 0.5 MHz. The FM modulated output is mixed by the adder 4, passed through the recording amplifier 9, and then recorded on the tape by the recording head 10. That is, the difference (Y1-Yr) is frequency-multiplexed in the high frequency band of the main channel and recorded on the same track.

FIG. 2 shows the frequency spectrum of the recording signal in this embodiment.

Next, during reproduction, the signal reproduced by the reproducing head 11 passes through the reproducing amplifier 12 and is separated by the frequency separating circuit 13 into the color signal Cr, the luminance signal Yr and the difference (Y1-Yr). The color signal Cr is converted to the original 3.5 by the high frequency conversion circuit 14.
It is converted into a carrier color signal of 8 MHz. Also, the luminance signal Y
r is FM demodulated by the first FM demodulation circuit 15 and the color signal C
It is added to r by the adder 16 to obtain the right-eye video signal R.

The difference (Y1-Yr) is the second F
The M demodulation circuit 17 performs FM demodulation, and the adder 18 adds the luminance signal Yr to form a luminance signal Yl. Further, the luminance signal Yl is added to the color signal Cr by the adder 19 to obtain the left-eye video signal L.

Further, even if the tape recorded by the VTR of this embodiment is reproduced by the conventional VHS system VTR, the main channel is reproduced with compatibility. Furthermore, a tape recorded by the VHS system VTR can be reproduced by the VTR of this embodiment.

In this embodiment, the difference component recorded is only the luminance signal, and the color signal component of the left-eye video signal is not recorded. However, since humans have low luminosity in terms of color, even if the left eye video signal L is obtained by adding the right eye color signal Cr component to the left eye luminance signal Yl, the stereoscopic effect is not impaired visually.

[0018]

As described above, according to the present invention, the conventional VT is used.
It is possible to record and reproduce a stereoscopic image while maintaining complete compatibility with R.

[Brief description of drawings]

FIG. 1 is a block diagram of a stereoscopic VTR according to an embodiment of the present invention.

FIG. 2 is a frequency spectrum of a recording signal in this embodiment.

[Explanation of symbols]

 1, 5 YC separation circuit 2 1st FM modulation circuit 3 Low frequency conversion circuit 4, 16, 18, 19 Adder 6 Subtractor 8 2nd FM modulation circuit 13 Frequency separation circuit 14 High frequency conversion circuit 15 1st FM demodulation circuit 17 2nd FM Demodulation circuit

Claims (3)

[Claims] 1. A first conversion means for converting a right-eye video signal or a left-eye video signal into a first frequency band, and a right-eye and left-eye parallax signal into a second frequency band higher than the first frequency band. A stereoscopic image recording apparatus comprising: a second converting means for performing the frequency conversion and a recording means for frequency-multiplexing the output of the first converting means and the output of the second converting means and recording them on the same track. 2. A YC separation circuit for obtaining a color signal and a first luminance signal from one of a right-eye video signal and a left-eye video signal, a frequency conversion circuit for converting the color signal into a predetermined frequency, and the first A first FM modulation circuit that FM-modulates the luminance signal of 1 at the first frequency, and a difference between the second luminance signal obtained from the other of the right-eye video signal and the left-eye video signal and the first luminance signal. The subtracter and the difference
The second F that performs FM modulation at a second frequency higher than the frequency of
M modulation circuit, output of the frequency conversion circuit, and the first FM
A stereoscopic image recording apparatus comprising a recording means for frequency-multiplexing an output of a modulation circuit and an output of the second FM modulation circuit and recording them on the same track of a magnetic tape. 3. The right-eye video signal or the left-eye video signal is converted into a first frequency band as a main channel signal, and the difference between the right-eye video signal and the left-eye video signal is higher than the first frequency band as a sub-channel signal. In a stereoscopic image reproducing apparatus for converting the signal into the second frequency band, frequency-multiplexing these signals, and reproducing the signal recorded on the same track of the magnetic tape, the frequency-multiplexed signal from the same track on the magnetic tape is reproduced. Reproducing means for reproducing, frequency separating means for frequency-separating the output of the reproducing means into the main channel signal and the sub-channel signal, the right-eye video signal and the left-eye video signal from the frequency-separated main channel signal and sub-channel signal A stereoscopic image reproducing device comprising: