JP3103909B2 - Imaging recording / reproducing system and recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an imaging and recording system including an imaging device such as a television camera and a recording device such as a video tape recorder, and more particularly, to the sharing of circuits in the imaging device and the recording device.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing the configuration of a video signal processing circuit of a conventional single-panel television camera ("Television Image Information Engineering Handbook" P.192, P.181).
See). In FIG. 3, an image sensor 51 converts an image of a subject (not shown) formed through a color filter 51a into an electric signal, and a sample and hold circuit 52 outputs a luminance signal (hereinafter, referred to as a Y signal) component and a color signal. The signal components (G component, Cy component, etc.) are extracted, the AGC circuit 53 adjusts the level, and the color demodulation circuit 54 creates R, G, B primary color signals from the Y signal components and the color signal components. Also,
The process circuit 55 creates a Y signal, an RY signal, and a BY signal from the Y signal and the R, G, B primary color signals, and an encoder circuit 56 converts the color subcarrier with the RY signal and the BY signal. A carrier chrominance signal (hereinafter, referred to as a C signal) is created by orthogonally modulating and combining, and a composite signal is created from the Y signal and the C signal. And the low-pass filter 5
7 is a Y signal output terminal 5 for removing unnecessary components from the Y signal.
9 and the band pass filter 58 removes unnecessary components from the C signal and outputs it to the C signal output terminal 60. The composite signal is output to a composite signal output terminal 61.

FIG. 4 is a block diagram showing a configuration of a video signal processing circuit of a conventional video tape recorder. First,
The processing at the time of recording will be described. A Y signal input terminal 71 receives a Y signal from a television camera or a line input, and a low-pass filter 72 removes unnecessary components from the Y signal.
The frequency modulation circuit 73 converts the Y signal into an FM-Y signal having a predetermined frequency shift and band, and the bandpass filter 74 removes unnecessary components from the FM-Y signal and outputs the signal to the addition circuit 75.

A C signal input terminal 76 receives a C signal from a television camera or a line input, a band-pass filter 77 removes unnecessary components from the C signal, and a low-frequency conversion circuit 78 outputs a C signal, for example. , 743 kHz, and a low-pass filter 79 removes unnecessary components from the low-frequency converted C signal, and outputs the signal to the adding circuit 75.

[0005] The adder circuit 75 includes an FM-Y signal and a low-frequency conversion C signal.
The signals are combined, the recording amplification circuit 80 amplifies the output of the addition circuit 75 to a predetermined recording level, and the recording head 81 records the output of the recording amplification circuit 80 on the magnetic tape 82. In the case of a composite signal input from the composite signal input terminal 83, the Y signal and the C signal are separated by the YC separation circuit 84, and the frequency modulation circuit 73 and the low-frequency conversion circuit 7 are used.
8 before the input.

Next, the processing at the time of reproduction will be described. The reproducing head 85 reproduces a video signal from the magnetic tape 82, and the reproducing amplifier circuit 86 amplifies the reproduced video signal to a predetermined level. The high-pass filter 87 separates the FM-Y signal from the output of the reproduction amplifier circuit 86,
Limits the level of the FM-Y signal to a fixed value or less, a demodulation circuit 89 demodulates the FM-Y signal and outputs a Y signal, and a low-pass filter 90 removes unnecessary components from the Y signal to remove the Y-signal.
Output to the signal output terminal 91.

A low-pass filter 92 separates the low-frequency conversion C signal from the output of the reproduction amplifier circuit 86, and a color demodulation circuit 93 demodulates the RY signal and the BY signal from the low-frequency conversion C signal. The circuit 94 creates a C signal by orthogonally modulating and combining the color subcarriers with the RY signal and the BY signal, and the band-pass filter 95 removes unnecessary components from the C signal and outputs a C signal. 96.

In the case of a composite signal, the output of the low-pass filter 90 and the output of the band-pass
The signals are combined by a combining circuit 97 and output to a composite signal output terminal 98. Then, an imaging and recording system was configured by the television camera configured as shown in FIG. 3 and the video tape recorder configured as shown in FIG.

[0009]

However, in the conventional imaging and recording system, the same circuit, such as a low-pass filter, a band-pass filter, and an encoder circuit, is used for the signal processing circuit of the television camera and the signal processing circuit of the video tape recorder. There is a circuit that is used only for playback with a video tape recorder, but it is idle when recording with a TV camera, but since the TV camera and the video tape recorder are in separate housings, they can be shared. There was a problem that it was not possible.

[0010] The present invention has been made in order to solve the above problems.
In an imaging recording system in which an imaging device and a recording device are configured separately, a part of a signal processing circuit of the imaging device is housed in the recording device, and the circuit housed in the recording device is used by the imaging device and the recording device. By sharing, the signal processing of the imaging device and the recording device can be performed by an integrated signal processing circuit, and imaging and recording that realizes system miniaturization, low power consumption, low cost, and miniaturization of the imaging device. It is an object to provide a system and a recording device.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an image pickup apparatus comprising: an image pickup apparatus; and a recording apparatus which is provided separately from the image pickup apparatus and records a signal output from the image pickup apparatus. In the system, at least the encoder circuit, the low-pass filter, and the band-pass filter are provided only in the recording device, and the circuit and the filter provided only in the recording device are shared for the signal processing of the imaging device and the signal processing of the recording device.

According to the present invention, there is provided a recording apparatus for recording a signal output from an imaging apparatus, wherein at least an encoder circuit, a low-pass filter, and a band-pass filter are provided.
The circuit and the filter provided in the recording device are configured to be commonly used for signal processing of the imaging device and the recording device.

[0013]

According to the present invention, since the imaging and recording system and the recording apparatus are configured as described above, the encoder circuit creates a C signal from the color difference signal output by the imaging apparatus, and creates a C signal from the color difference signal during reproduction. I do. The low-pass filter removes unnecessary components from the Y signal output by the imaging device, and removes unnecessary components from the Y signal during recording and reproduction. The bandpass filter removes unnecessary components from the C signal generated by the encoder circuit, and removes unnecessary components from the C signal during recording and reproduction.

Further, if a process circuit is also provided in the recording apparatus, the R, G, B signals output from a personal computer or the like can be converted into color difference signals by the process circuit, and the C signal can be created from the color difference signals by the encoder circuit. it can.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram illustrating a configuration of video signal processing of an imaging device according to an embodiment of the present invention. In FIG. 1, an image sensor 1 converts an image of a subject (not shown) formed through a color filter 1a into an electric signal, and a sample and hold circuit 2 outputs a Y signal component and a color signal component (G component, Cy). AGC circuit 3 performs level adjustment, and color demodulation circuit 4 creates R, G, and B primary color signals from the Y signal component and the color signal component.
Further, the process circuit 5 creates a Y signal from the Y signal and the R, G, B primary color signals and outputs it to the Y output terminal 6, creates an RY signal and a BY signal and creates a chrominance signal output terminal 7. Output to That is, it can be considered that the present imaging apparatus is obtained by removing the signal processing circuit after the encoder circuit 56 in the conventional television camera shown in FIG. Then, as described later, the removed signal processing circuit is provided in the recording apparatus. The color difference signal output terminal 7 is actually provided as two systems for the RY signal and the BY signal, but is described as one system for convenience.

FIG. 2 is a block diagram showing a signal processing circuit of the recording apparatus according to the embodiment of the present invention. As is apparent from the following description, the first to sixth switching circuits 12, 14, 19, 21, 22, and 24 select the terminal a when recording a camera signal and select the terminal b when recording a line signal. The terminal c of the third switching circuit 19 has no signal input, and the terminal b of the fourth switching circuit 21 has no signal output. The fact that there is no such information is described in advance. Also, as in FIG. 1, the color difference signal is described as one system.

First, signal processing during recording will be described. The camera Y signal input terminal 11 receives the Y signal output from the Y signal output terminal 6 of the imaging apparatus shown in FIG. 1, and the first switching circuit 12 outputs the Y signal to the low-pass filter 13 via the terminal a. , The low-pass filter 13 removes unnecessary components from the Y signal, and the second switching circuit 1
4 outputs a Y signal to a frequency modulation circuit 15 via a terminal a, the frequency modulation circuit 15 converts the Y signal into an FM-Y signal having a predetermined frequency shift and band, and a band-pass filter 16 outputs an FM-Y signal. An unnecessary component is removed from the Y signal and output to the addition circuit 17.

In the case of the Y signal input to the line Y signal input terminal 30, the first switching circuit 12 outputs the Y signal to the low-pass filter 13 via the terminal b. Subsequent processing is the same as in the case of the camera Y signal. Further, the camera color difference signal input terminal 18 inputs the RY signal and the BY signal output from the color difference signal output terminal 7 of the imaging apparatus shown in FIG. 1, and the third switching circuit 19 is connected via the terminal a. The RY signal and the BY signal are output to the encoder circuit 20, and the encoder circuit 20 creates a C signal by orthogonally modulating and combining the color subcarriers with the RY signal and the BY signal. The fourth switching circuit 21 outputs the C signal to the fifth switching circuit 22 via the terminal a,
The switching circuit 22 outputs the C signal to the band-pass filter 23 via the terminal a,
Removes unnecessary components from the C signal and outputs the signal to the sixth switching circuit 24. The sixth switching circuit 24 outputs the C signal to the low-frequency conversion circuit 25 via the terminal a. The low-pass conversion circuit 25 converts the C signal into a low-pass conversion C signal centered on, for example, 743 kHz,
Removes unnecessary components from the low-frequency conversion C signal,
7 is output.

The adder circuit 17 outputs the FM-Y signal and the low-frequency conversion C
The signals are combined, the recording amplification circuit 27 amplifies the output of the addition circuit 17 to a predetermined recording level, and the recording head 28 records the output of the recording amplification circuit 27 on the magnetic tape 29. Also,
In the case of a C signal input to the line C signal input terminal 31,
The fifth switching circuit 22 outputs the signal to the band-pass filter 23 via the terminal b. The subsequent processing is the same as the processing of the RY signal and the BY signal input to the camera color difference signal input terminal 18.

Next, the processing at the time of reproduction will be described. The reproducing head 32 reproduces a video signal from the magnetic tape 29, and the reproducing amplifier 33 amplifies the video signal to a predetermined level. The high-pass filter 34 is a reproduction amplifier circuit 33
, The FM-Y signal is separated from the output of the
The level of the -Y signal is limited to a certain value or less, and the demodulation circuit 36
Demodulates the FM-Y signal and outputs the Y signal to the first switching circuit 12, which outputs the Y signal to the low-pass filter 13 via the terminal c, and the low-pass filter 13 outputs the Y signal. , And removes unnecessary components from the signal, and outputs the signal to the second switching circuit 14. The second switching circuit 14 outputs the Y signal to the reproduced Y signal output terminal 37 via the terminal c.

The low-pass filter 38 separates the low-frequency conversion C signal from the output of the reproduction amplifier circuit 33, and the color demodulation circuit 39 demodulates the RY signal and the BY signal from the low-frequency conversion C signal. 3 and the third switching circuit 19 outputs the RY signal and the B-
The Y signal is output to the encoder circuit 20. The encoder circuit 20 creates a C signal by orthogonally modulating and combining the color subcarriers with the RY signal and the BY signal, and outputs the C signal to the fourth switching circuit 21. c to the fifth switching circuit 22 via the terminal c.
, And outputs the C signal to the band-pass filter 23. The band-pass filter 23 removes unnecessary components from the C signal and outputs the signal to the sixth switching circuit 24. The sixth switching circuit 24 is connected via the terminal c. And outputs a C signal to a reproduction C signal output terminal 40.

As described above in detail, in this embodiment, the low-pass filter 13 is a conventional low-pass filter 57,
The bandpass filter 23 shares the conventional bandpass filters 58, 77, and 95, and the encoder circuit 20 shares the conventional encoder circuits 56 and 94. In the above embodiment, the signal processing circuit after the encoder circuit 56 housed in the conventional television camera is housed in the video tape recorder. However, the signal processing circuit after the process circuit 55 is housed in the video tape recorder. Good. In this way, the R, G, B signals output from the personal computer or the like can be input to the video tape recorder and recorded.
In addition, various modifications are possible based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0023]

As described above in detail, according to the present invention, a part of the signal processing circuit of the imaging device is housed in the recording device, and the circuit is shared by the imaging device and the recording device. Therefore, the following effects are obtained. (1) One-chip LSI for signal processing of imaging device and recording device
And the like can be performed by an integrated signal processing circuit.
Therefore, low power consumption, small size, and low cost can be realized. (2) Since the signal processing circuits are concentrated in the imaging device housing, the size and weight of the imaging device can be reduced, and the degree of freedom in photographing can be improved. (3) Since it is possible to temporarily output the composite video signal from the imaging device and return it to the Y signal and the C signal again in the recording device, it is possible to reduce power consumption and improve image quality.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of video signal processing of an imaging device according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a signal processing circuit of the recording apparatus according to the embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a video signal processing circuit of a conventional single-panel television camera.

FIG. 4 is a block diagram showing a configuration of a video signal processing circuit of a conventional video tape recorder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image sensor 2 Sample hold circuit 4 Color demodulation circuit 5 Process circuit 13 Low pass filter 20 Encoder circuit 23 Band pass filter

Claims (2)

(57) [Claims] 1. A and the image pickup device is configured to the imaging apparatus and another member, recording for recording and reproducing a signal in which the imaging device is output
In an imaging recording / playback system including a playback device, the imaging device includes a luminance signal based on an output of an imaging element.
A color difference signal is generated, and the generated luminance signal and color difference signal are generated.
And the recording / reproducing apparatus FM-modulates a luminance signal to be recorded and a chroma signal to be recorded.
Signal, and the FM-modulated luminance signal and the low-
Multiplexes chroma signals that have been subjected to
Recording system processing means, and a reproduction signal from the recording medium, the FM modulation luminance signal
Frequency conversion chroma signal, and separates the
From the low-frequency converted chroma signal
Reproduction system processing means for demodulating a signal; an input terminal for a luminance signal and an input terminal for a color difference signal; an output terminal for a luminance signal and an output terminal for a color difference signal; and a luminance signal from the input terminal for the luminance signal or the reproduction system.
The luminance signal from the processing means is selectively inputted, and
A luminance signal from a signal input terminal or the reproduction system processing means
Unnecessary components in the luminance signal from the
The removed luminance signal is stored in the recording system processing means or the luminance.
Brightness signal processing means for selectively outputting to a signal output terminal
And a color difference signal from an input terminal of the color difference signal or the reproduction system.
The color difference signal from the processing means is selectively input, and the color difference
A color difference signal from a signal input terminal or the reproduction system processing means
Is converted to a chroma signal, and the converted
Removes unnecessary components in the chroma signal and removes the unnecessary components
The extracted chroma signal to the recording system processing means or the chroma
Chroma signal processing means to selectively output to the signal output terminal
And a step for recording a signal from the imaging device.
The luminance signal and the color difference signal from the device are input to the luminance signal.
Terminal and the color difference signal input terminal.
Signal processing means, the luminance signal from the input terminal of the luminance signal
Unnecessary components were removed removal, removal luminance signal of the unnecessary component of
Signal to the recording system processing means, and
In the stage, the color difference signal from the color difference signal input terminal is chroma
Signal, and unnecessary components in the converted chroma signal
And the chroma signal from which the unnecessary components have been removed
Supply to the recording system processing means, and
When a signal is recorded on the recording medium and the signal on the recording medium is reproduced, the reproduction system processing is performed.
Means for reproducing the signal from the recording medium.
In the luminance signal processing means, the reproduction system processing means
Of unnecessary components in the luminance signal of
Output from the luminance signal output terminal.
In the color difference signal processing means,
Of the color difference signal into a chroma signal.
Unnecessary components in the signal are removed.
From the chroma signal output terminal.
Imaging recording and reproducing system, characterized in that as that. 2. A luminance signal to be recorded is FM-modulated and recorded.
Low frequency conversion of the chroma signal to be
And multiplex the low-frequency converted chroma signal
A recording system processing means for recording on a recording medium, and an FM-modulated luminance signal from a reproduced signal from the recording medium.
Frequency conversion chroma signal, and separates the
From the low-frequency converted chroma signal
Reproduction system processing means for demodulating a signal; an input terminal for a luminance signal and an input terminal for a color difference signal; an output terminal for a luminance signal and an output terminal for a color difference signal; and a luminance signal from the input terminal for the luminance signal or the reproduction system.
The luminance signal from the processing means is selectively inputted, and
A luminance signal from a signal input terminal or the reproduction system processing means
Unnecessary components in the luminance signal from the
The removed luminance signal is stored in the recording system processing means or the luminance.
Brightness signal processing means for selectively outputting to a signal output terminal
And a color difference signal from an input terminal of the color difference signal or the reproduction system.
The color difference signal from the processing means is selectively input, and the color difference
A color difference signal from a signal input terminal or the reproduction system processing means
Is converted to a chroma signal, and the converted
Removes unnecessary components in the chroma signal and removes the unnecessary components
The extracted chroma signal to the recording system processing means or the chroma
Chroma signal processing means to selectively output to the signal output terminal
And an input terminal for the luminance signal and an input terminal for the color difference signal.
When recording these luminance signals and color difference signals,
The luminance signal from the input terminal of the luminance signal
Removes unnecessary components of the signal and removes the unnecessary components.
The color difference signal to the recording system processing means.
The color difference signal from the color difference signal input terminal.
Convert to chroma signal, unnecessary in the above converted chroma signal
Components, and removes the chroma signal from which the unnecessary components have been removed.
Supply to the recording system processing means,
When a signal is recorded on the recording medium and the signal on the recording medium is reproduced, the reproduction system processing is performed.
Means for reproducing the signal from the recording medium.
In the luminance signal processing means, the reproduction system processing means
Of unnecessary components in the luminance signal of
Output from the luminance signal output terminal.
In the color difference signal processing means,
Of the color difference signal into a chroma signal.
Unnecessary components in the signal are removed.
From the chroma signal output terminal.
Recording and reproducing apparatus is characterized in that as that.