JPH09284806A - Video camera equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video camera equipment which receives externally a standard video signal such as analog video and audio signal, applies data compression processing to the signal and records the compressed signal. SOLUTION: Changeover switches 104, 111 selected in the camera image pickup mode or the line input mode are provided in addition to a digital recording/reproducing video camera equipment, and in the case of the camera image pickup mode, the switches 104, 111 are thrown to the position of a terminal (a) and in the case of the line input mode, the switches 104, 111 are thrown to the position of a terminal (b). The output signal from a charge coupled device(CCD) 102 is given to a digital signal processing circuit 107 via an amplifier 103, a switch 104 and an A/D converter 105 to conduct generating processing of chrominance/luminance signals. A data compression/expansion circuit 106 eliminates a redundant part from the generated chrominance/ luminance signal and the result is recorded in a hard disk drive(HDD) 108. In the line input video recording mode, a line input signal is fed to the signal processing circuit 107 via the switch 104 and the A/D converter 105 to generate the chrominance/ luminance signal. The data compression/expansion circuit 106 eliminates a redundant part from the generated chrominance/luminance signal and the result is recorded in the hard disk drive(HDD) 108.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video camera which compresses and records a video signal and an audio signal picked up by a video camera by using a data compression process based on MPEG (moving image compression standard) and then reproduces and expands them. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, in a video camera device for recording a signal by a digital recording system, after converting a video / audio signal captured by an image sensor or a microphone into a digital signal, various digital signal processing is performed, and thereafter,
The work of removing the redundant portion of the data, that is, the data compression process, was performed and recorded on a recording medium such as a video tape.

[0003]

By the way, in a video camera device for recording a signal by a digital recording system,
It would be convenient if an analog standard video / audio signal such as a TV broadcast or an analog video deck could be externally input, digitally converted inside the video camera, and then compressed and recorded.

However, in the above-mentioned conventional technique, a digital recording type video camera device is provided with an analog image / video signal.
It was not possible to input a standard video signal such as an audio signal for compression processing and recording.

Further, it is convenient if a reproduction signal (standard video signal such as analog standard video / audio signal) from the VTR can be input to and recorded in a digital recording type video camera device. A video signal having a fluctuation component due to the jitter of the tape running system is output to. This fluctuation component causes a calculation error when performing digital signal processing. In addition, it also causes an increase in the amount of data when performing data compression.

[0006] Conventionally, as a technique for generating a standard video signal by removing jitter from a VTR reproduction signal having jitter,
"Journal of the Television Society, 1977, No. 10,
P. 771-777 ”. This generates a clock with a frequency four times as high as that of the subcarrier locked to the reproduced signal with jitter, thereby performing A / D conversion and writing to the RAM memory, and to the memory with this time base error. This is a method of converting a written video signal into a standard video signal having no time base error by reading it with a stable clock pulse locked to a reference synchronization signal.

However, in the above-described conventional standard video signal generation technique without a jitter component, in addition to the reference clock oscillator for generating the reference synchronization signal, an oscillator locked to the VTR reproduction signal, for example, a VCO (voltage controlled oscillator) is used. It was necessary to prepare the two oscillators, and the circuit scale was increased.

A first object of the present invention is to realize a video camera device capable of inputting a standard video signal such as analog video or audio from the outside, compressing the data and recording the data.

A second object of the present invention is to input, for example, a VTR reproduction video signal having jitter from the outside, remove the jitter from the input reproduction video signal with a simple circuit, and perform data compression processing. It is to realize a recordable video camera device.

[0010]

[Means for Solving the Problems]

(1) In order to achieve the above object, the present invention is configured as follows. That is, in a video camera device, a selection switch that switches between an internal video signal and an external video signal, a signal processing circuit that adds at least a process of generating a color signal and a luminance signal from the video signal selected by the selection switch, The redundant part of the output signal of the signal processing circuit is removed,
And a data compression unit for compressing data.

An internal video signal of the video camera device and an external video signal are switched by a selection switch, and a color signal and a luminance signal are generated from the video signal output from the selection switch. When the color signal and the luminance signal are configured to be data-compressed, an analog video signal can be input from the outside to realize a video camera device capable of data compression processing.

(2) Further, an image pickup device, and a video signal processing circuit for processing a video signal read from the image pickup device,
A microphone, an audio signal processing circuit for processing an audio signal from the microphone, and a redundant portion of an output signal from the video signal processing circuit and the audio signal processing circuit are removed,
In a video camera device having a data compression unit for compressing data, a first video input terminal arranged between an image sensor and a video signal processing circuit, to which a video signal from the image sensor is supplied, and an external input signal. A first selection switch having a second video input terminal to which a video signal is supplied,
A first audio input terminal provided between the microphone and the audio processing circuit, to which an audio signal from the microphone is supplied, and a second audio input terminal to which an externally input audio signal is supplied.
And a second selection switch having an audio input terminal, and the video signal from the image sensor and the audio signal from the microphone are subjected to signal processing by the video signal processing circuit and the audio signal processing circuit, or an image input from the outside. Whether the signal and the audio signal are processed by the video signal processing circuit and the audio signal processing circuit is selected by the first and second selection switches.

(3) Further, the image pickup device, an A / D converter for converting an analog video signal read from the image pickup device into a digital video signal, and a digital video signal output from the A / D converter are standard. An image sensor and an A / D converter in a video camera device having a video signal processing circuit for converting into a television signal and a data compression section for removing redundant portions of an output signal from the video signal processing circuit and compressing data. And a selection switch having a first video input terminal to which a video signal from the image sensor is supplied and a second video input terminal to which a video signal input from the outside is supplied, The video signal from the image sensor is A /
Depending on whether the signal is supplied to the video signal processing circuit through the D converter and processed, or whether the video signal input from the outside is supplied to the video signal processing circuit through the A / D converter and processed, the selection switch is used. select.

(4) Further, the image pickup device, the first A / D converter for converting the analog video signal read from the image pickup device into the digital video signal, and the output from the first A / D converter. In a video camera device having a video signal processing circuit for converting a digital video signal into a standard television signal and a data compression unit for removing a redundant part of an output signal from the video signal processing circuit and compressing the data, The second A to which the input video signal is supplied
An output signal from the / D converter and the first A / D converter;
The output signal from the second A / D converter is supplied to the first
The video signal processing circuit includes a selection switch for selecting either the output signal from the A / D converter or the output signal from the second A / D converter and supplying the signal to the signal processing circuit.
The selection switch selects whether to process the output video signal from the image sensor or to process the video signal input from the outside.

(5) Further, an image pickup device, a first A / D converter for converting an analog video signal read from the image pickup device into a digital video signal, a microphone, and a voice signal from the microphone are digitally voiced. A second A / D converter for converting to a signal and first and second A / D converters
A signal processing circuit for converting the digital video signal and the digital audio signal from the D converter into a digital standard television signal, and a D / for converting the digital standard television signal output from the signal processing circuit into an analog standard television signal. A converter and a data compression section for removing data from the standard television signal output from the signal processing circuit and compressing the data, and a recording medium for recording the video data and audio data compressed by the data compression section. A video camera device having a first video input terminal arranged between the image sensor and the first A / D converter, to which a video signal from the image sensor is supplied, and a video input from the outside. A first selection switch having a second video input terminal to which a signal is supplied, a microphone and a second A /
A second audio input terminal which is arranged between the D converter and has a first audio input terminal to which an audio signal from a microphone is supplied and which has a second audio input terminal to which an externally input audio signal is supplied. A video signal from the image pickup device and an audio signal from a microphone are converted into a digital standard television signal by a processing circuit or a video signal and an audio signal input from the outside are digital standard television by a signal processing circuit. Whether to convert to John signal,
The selection is made by the first and second selection switches.

(6) Further, the image pickup device, an A / D converter for converting an analog image signal read from the image pickup device into a digital image signal, and a digital image signal from the A / D converter is a digital standard television. From a signal processing circuit for converting into a signal, a D / A converter for converting a digital standard television signal output from this signal processing circuit into an analog standard television signal, and a standard television signal output from the signal processing circuit In a video camera device having a data compression unit that removes redundant parts and compresses data, and a recording medium that records the video data compressed by this data compression unit, the video camera device is arranged between an image sensor and an A / D converter. A first video input terminal to which a video signal from the image sensor is supplied and a second video input terminal to which a video signal input from the outside is supplied. A first selection switch having an input terminal is provided, and a video signal from the image sensor is converted into a digital standard television signal by a processing circuit, or a video signal input from the outside is digital standard television signal by a signal processing circuit. Select whether to convert to.

(7) Further, an image pickup device, a first A / D converter for converting an analog video signal read from the image pickup device into a digital video signal, and a digital signal from the first A / D converter. A signal processing circuit for converting a video signal into a digital standard television signal; a D / A converter for converting a digital standard television signal output from the signal processing circuit into an analog standard television signal;
In a video camera device having a data compression unit for removing a redundant portion from a standard television signal output from a signal processing circuit and compressing the data, and a recording medium for recording the video data compressed by the data compression unit, A second A / D converter to which a video signal input from
And a selection switch for selecting whether to supply the output signal from the first A / D converter to the signal processing circuit or to supply the output signal from the second A / D converter to the signal processing circuit.

(8) Preferably, in the video camera device according to (1) above, the signal processing circuit generates a reference clock signal generator and a reference synchronization signal based on the reference clock signal from the reference clock signal generator. A sync signal generator for generating, an A / D converter for converting an internal video signal and an external video signal into a digital video signal, and a sync separation for separating a sync signal from the digital video signal converted by the A / D converter. RAM memory in which the circuit and the digital video signal converted by the A / D converter are written according to the reference clock signal of the reference clock signal generator, and the stored digital video signal is read out according to the reference clock signal of the reference clock signal generator. Between the circuit and the sync signal generated by the sync signal generator and the sync signal separated by the sync separation circuit. A difference detecting means for detecting a minute, the correction amount based on the detected difference by the difference detecting means,
An electronic zoom circuit for performing time axis correction on the digital video signal stored in the RAM memory circuit.

The reference clock signal generator counts the period of the sync signal separated from the reproduced video signal having jitter,
After detecting the difference from the reference synchronization signal generated in advance, that is, the time base error amount, the signal with jitter read from the RAM memory circuit is expanded or compressed by the electronic zoom by the reciprocal number of the detected time base error amount. As a result, it is possible to realize a video camera device capable of performing data compression processing and recording by removing the jitter from the input reproduced video signal with a simple circuit.

(9) Further, preferably, in the video camera device according to the above (8), the sync separation circuit is the above A.
The sync signal is separated from the analog video composite signal supplied to the / D converter.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic configuration diagram of a video camera device according to a first embodiment of the present invention. In the figure, 101 is a lens of a digital video camera device, 102 is a CCD image pickup device, 103 is an analog amplifier, 104 is a video signal changeover switch (selection switch), 105 is an A / D converter, and 106 is data compression / compression.
It is a decompression circuit. Further, 107 is a digital signal processing circuit, 108 is a hard disk drive, and 109 is D / A.
A converter, 110 is a microphone of a video camera device,
111 is an audio signal changeover switch (selection switch), 1
Reference numeral 12 is an A / D converter, and 113 is a D / A converter. Further, 114 is a line input terminal, and a video signal such as analog video or audio is input to the video camera device from the outside of the video camera device via the line input terminal 114.

CCD image sensor 1 through lens 101
The subject image formed on the light receiving surface of 02 is photoelectrically converted by the CCD image sensor 102 and read. The output video signal of the CCD image pickup device 102 is amplified by the analog amplifier 103 and supplied to the a terminal (first video input terminal) of the video signal changeover switch 104. Similarly, the b terminal (second video input terminal) of the changeover switch 104 is
A standard TV video signal, that is, a line video signal is supplied through the line input terminal 114.

The audio signal collected by the microphone 110 is supplied to the a terminal (first audio input terminal) of the audio changeover switch 111. Further, the line input terminal 1 is connected to the b terminal (second audio input terminal) of the changeover switch 111.
A standard TV or line audio signal is provided via 14.

First, the case where the video camera photographing mode is selected will be described. In addition, the selection of this video camera shooting mode, this video camera device,
Although not shown, a manual input selection switch is provided, and the input selection switch is used to select the video camera photographing mode or the line input mode. In the video camera shooting mode, the switches 104 and 111
Is set to the a terminal side, and in the line input mode, the switches 104 and 111 are set to the b terminal side.

In the video camera shooting mode, CC
The output video signal of the D image sensor 102 is the analog amplifier 1
03 and the a terminal of the video signal changeover switch 104, and is supplied to the A / D converter 105.
At 05, it is converted into a digital video signal. Further, the output audio signal of the microphone 110 is supplied to the A / D converter 112 via the a terminal of the audio signal changeover switch 111, and is converted into a digital audio signal by the A / D converter 112.

Next, the digitally converted video signal and audio signal are supplied to a digital signal processing circuit 107, and in this digital signal processing circuit 107, processing for generating a color signal and a luminance signal and audio processing are performed. It Thereafter, the generated color / luminance signal and audio signal (digital standard television signal) are supplied from the digital signal processing circuit 107 to the data compression / decompression circuit 106, and the data compression / decompression circuit 106 causes the color / luminance signal and The redundant part in the audio signal is removed, and the MPEG
Bitstream such as hard disk drive 10
Record to 8.

When the video / audio signal recorded in the video camera device is reproduced, that is, in the video camera reproduction mode, the video / audio signal recorded from the hard disk drive 108 is reproduced.
After reading the audio signal to the data compression / expansion circuit 106, the data compression / expansion circuit 106 expands the data. Then, the data decompressed by the data compression / decompression circuit 106 is supplied to the digital signal processing circuit 107, and the reproduction processing is performed by this signal processing circuit 107, and D /
The video signal is supplied to the A converter 109, and the D / A converter 1
An audio signal is supplied at 13. These D / A converters 10
The video / audio signals analog-converted in 9 and 113 are
It can be taken out as an analog standard television signal.

Next, the recording / reproducing mode of the standard TV signal, that is, the line input mode will be described. First, in the line input recording mode, the video signal of the line input signal is A / D via the b terminal of the changeover switch 104.
Is supplied to the converter 105, converted into a digital signal,
The audio signal of the line input signal is the changeover switch 111.
It is supplied to the A / D converter 112 through the b terminal of and is converted into a digital signal.

The video / audio signals converted into digital signals by the A / D converters 105 and 112 are supplied to a digital signal processing circuit 107, and the digital signal processing circuit 107 separates color / luminance and demodulates color signals. Processing is performed to generate color / luminance signals and audio signals.

Thereafter, similarly to the video camera photographing mode, the generated color / luminance signal and audio signal are supplied to the data compression / expansion circuit 106, and the redundant portion in the color / luminance signal and audio signal is data compressed. / Expansion circuit 106
And is recorded in the hard disk drive 108. Also, when playing back the recorded line input signal,
Since it is exactly the same as the video camera playback mode, the description thereof is omitted.

Here, the output data from the data compression / expansion circuit 106 can be supplied to the personal computer through the interface, and the data can be supplied from the personal computer to the data compression / expansion circuit 106 through the interface. Is also possible. With this, the CCD
It is also possible to compress a video signal captured by the image sensor 102 or a video signal input through a line and send it to a personal computer.

Next, the internal configuration of the digital signal processing circuit 107 will be described in detail with reference to FIG. In the figure, 201 is a luminance processing circuit, 202 is a color processing circuit, 2
Reference numeral 03 denotes a Y / C separated color demodulation circuit, which is a luminance processing circuit 201, a color processing circuit 202, and a Y / C separated color demodulation circuit 2.
The output signal from the A / D converter 105 is supplied to 03. Further, 204 is a changeover switch, 205 is a sub-sampling circuit, 206 is an up-sampling circuit, 2
Reference numeral 07 is a color modulation circuit.

Luminance processing circuit 201 and color processing circuit 202
Generates a luminance signal and a color difference signal from a video signal captured by the CCD image sensor 102. In addition, the Y / C separation circuit 20
3 separates the luminance signal and the modulated color difference signal from the composite video signal supplied to the line input terminal 114, and further demodulates the separated modulated color difference signal into a baseband color difference signal.

The changeover switch 204 is set to the a terminal side when the video camera photographing mode is selected by the manual input selection switch (not shown) and when the line input mode is selected. , B
Set on the terminal side. Then, the changeover switch 204
Is a luminance processing circuit 201, a color processing circuit 202 and Y /
Of the output signals of the C separation circuit 203, the signal selected according to the above mode is supplied to the sub sampling circuit 205.

The sub-sampling circuit 205 is supplied with 4: 2: 2 or 4: 2 from the changeover switch 204.
The 1: 1 digital component video signal conforms to the input standard of the data compression / expansion circuit 106 and 4: 2 :.
Sub-sampling is performed on the SIF signal of 0 or the like. The upsampling circuit 206 converts the 4: 2: 0 SIF signal sent from the data compression / expansion circuit 106 into the original 4: 2 :.
It is converted into a component video signal of 2 or 4: 1: 1, and then the color difference signal is converted into a modulated color difference signal by the color modulation circuit 207 and supplied to the D / A converter 109 together with the luminance signal.

In this way, the video signal supplied from the A / D converter 105 is externally input by switching the processing between the camera photographing mode and the line input mode and sending it to the data compression / expansion circuit 106. Processing suitable for image compression can be added to the video signal.

As described above, according to the first embodiment of the present invention, the signal changeover switches 104 and 111 are added to the digital recording / reproducing video camera device, and the signal processing in the digital signal processing circuit 107 is changed to video. By switching between the photographing mode by the camera and the line input mode for inputting a standard TV signal or the like from the outside, the video signal photographed by the CCD image pickup device 102 and the microphone 110 are switched.
It becomes possible to record / reproduce not only the audio signals collected in step 1, but also the analog video / audio signals input from the outside by data compression.

In the above-mentioned example, the line video signal input from the outside has been described with respect to a so-called composite video signal in which a modulated color signal is superimposed on a luminance signal, but a component video signal, that is, a color signal and a luminance signal. Even in the method of separating and supplying signals, A /
Of course, it can be realized by adding one D converter.

Further, in the above-mentioned example, the hard disk drive is used as the recording medium for recording the compressed video signal, but other recording media such as a video tape and a flash memory may be used for recording. You can go.

FIG. 3 is a schematic block diagram of a video camera device according to a second embodiment of the present invention. In FIG.
The video signal from the CD image sensor 102 is supplied to the a terminal of the video signal changeover switch 104 via the analog amplifier 103 and the A / D converter 105. Also, the line video signal from the line input terminal 114 is the second A / D
The video signal changeover switch 104 via the converter 301
B terminal.

Although not shown, the circuit for processing the audio signal is the same as in the example of FIG. That is,
The audio output signal from the microphone 110 is supplied to the terminal a of the audio signal changeover switch 111, and the audio signal among the line input signals is the audio signal changeover switch 1.
11 is supplied to the b terminal. Then, the output signal of the changeover switch 111 is supplied to the digital signal processing circuit 107 via the A / D converter 112. Further, other parts are similar to those of the first embodiment shown in FIG.

According to the second embodiment, in addition to the effects obtained in the first embodiment, an A / D converter for converting an input video signal into a digital signal in the camera photographing mode and the line input mode is provided. , A / D converters 105 and 301 are provided separately, there is an effect that digital conversion with characteristics suitable for each input can be performed.

FIG. 4 is a schematic configuration diagram of a video camera device according to a third embodiment of the present invention. In the figure, the same parts as those of the embodiment of FIG. 1 are designated by the same reference numerals. In the example of FIG. 4, the illustration of the circuit for processing the audio signal is the same as that of the example of FIG. 1, although the illustration is omitted as in the example of FIG. That is, the audio output signal from the microphone 110 is supplied to the a terminal of the audio signal changeover switch 111, and among the line input signals,
The audio signal is supplied to the b terminal of the audio signal changeover switch 111. Then, the output signal of the changeover switch 111 is supplied to the digital signal processing circuit 107 via the A / D converter 112.

In FIG. 4, reference numeral 401 is a synchronizing signal separation circuit, 402 is a counter, 403 is a comparator (difference detecting means), and 409 is a reference clock generator. Also, 40
4 is a memory read pulse generation circuit, 405 is a memory write pulse generation circuit, and 406 is a reference synchronization signal generation circuit. These pulse generation circuits 404 and 405 are memory read pulses according to the reference clock signal from the reference clock generator. Signal and memory write pulse signal. Further, 407 is a RAM memory circuit, 408 is an electronic zoom circuit, and other circuits or blocks are the same as those in the first embodiment shown in FIG.

Further, FIG. 5 is a timing chart of the VTR reproduction signal and the corrected signal input in the third embodiment shown in FIG. A video signal having a jitter component reproduced by the VTR (shown in (a) of FIG. 5) is transmitted through the line input terminal 114 and the switch 104 to the A / D converter 1
And is converted to a digital signal. Then, the video signal converted into the digital signal is supplied to the RAM memory 407, and at the same time, the synchronization signal separation circuit 4
01 is supplied.

The sync signal separation circuit 401 separates the reproduction sync signal from the supplied digital video signal (shown in FIG. 5C) and inputs it to the reset terminal of the counter 402. The counter 402 counts the cycle of the reproduction synchronization signal with the reference clock signal generated by the reference clock generator 409 and supplies it to the comparator 403. The reference synchronization signal generation circuit 406 supplies the reference synchronization signal generated based on the reference clock signal from the reference clock generator 409 to the comparator 403. In the comparator 403, the signal from the counter 402 and the reference Sync signal generation circuit 406
And the signals d1 to d3 are calculated.

At the same time, the video signal (shown in FIG. 5B) digitally converted by the A / D converter 105 is written in the RAM memory 407 in accordance with the write pulse from the write pulse generation circuit 405. Thereafter, at an appropriate time, the video signal read from the RAM memory 407 (shown in (d) of FIG. 5) in accordance with the read pulse from the read pulse generation circuit 404 is the electronic zoom circuit 4
After the time axis conversion in 08 (shown in (e) of FIG. 5),
It is supplied to the digital signal processing circuit 107.

The video signal processed by the digital signal processing circuit is supplied to the hard disk drive 108 via the data compression / expansion circuit circuit 106. Also, the hard digital disk drive 108 and the data compression / expansion circuit 1
The video signal reproduced via 06 is supplied from the digital signal processing circuit 107 to the D / A converter 109, converted into an analog signal, and output as a TV signal (shown in (f) of FIG. 5).

Here, the electronic zoom circuit 408 is supplied with the differences d1 to d3 calculated by the comparator 403,
The conversion amount of time-axis expansion or time-axis compression in the electronic zoom circuit 408 is the difference d calculated by the comparator 403.
1 to d3. That is, the reciprocal of the difference between the reproduction sync signal having jitter and the reference sync signal (1 / d1 to 1)
/ D3) is converted on the time axis, so that the jitter component included in the reproduced video signal can be corrected equivalently.

In the example of FIG. 4, the jitter amount within one clock signal of the reference clock signal cannot be corrected, but in this case, for example, the reference clock is set to 4 fsc (14.3 MH).
z), the fluctuation amount of jitter is about 0.5 mm on a 20-inch monitor, which is a level that poses no practical problem. Further, the fluctuation amount can be reduced by using a high-speed reference clock.

As described above, according to the third embodiment of the present invention, in addition to the effect obtained in the first embodiment, it is not necessary to provide a VCO (voltage controlled oscillator) synchronized with the reproduction signal.
As the oscillator, with a simple configuration including only the reference clock generator, it is possible to generate a standard signal by removing the jitter from the VTR reproduction video signal which is a non-standard signal, and record / reproduce it.

Further, in the third embodiment, blocks other than the reference clock generator 409, the lens 101, the CCD image pickup device 102, the analog amplifier 103, and the hard disk drive 108 can be incorporated in the same IC. Yes, this realizes a compact circuit configuration.

Further, in the third embodiment, the sync signal separation circuit 401 separates the sync signal from the digitally converted video signal, but the analog sync separation circuit is used to synchronize the video signal before digital conversion. The same effect can be obtained by separating the signals and inputting them to the counter 402.

[0054]

Since the present invention is configured as described above, it has the following effects. In a video camera device, a selection switch for switching between an internal video signal and an external video signal, and a video signal selected by this selection switch,
A signal processing circuit for performing processing for generating at least a color signal and a luminance signal, and a data compression unit for removing a redundant portion of an output signal of the signal processing circuit and performing data compression are provided.
Therefore, it is possible to realize a video camera device capable of data compression processing by inputting an analog video signal from the outside.

In the above video camera device, the signal processing circuit includes a reference clock signal generator, a synchronizing signal generator, and an A / D converter for converting a video signal into a digital video signal.
A D conversion stage, a sync separation circuit for separating a sync signal from a digital video signal, and a digital video signal are written according to a reference clock signal of a reference clock signal generator,
Based on the RAM memory circuit read out, a difference detecting means for detecting a difference between the synchronization signal generated by the synchronization signal generator and the synchronization signal separated by the synchronization separation circuit, and the difference detected by the difference detection means. RAM depending on the amount of correction
An electronic zoom circuit for performing time axis correction on the digital video signal stored in the memory circuit.

Therefore, the reference clock signal generator counts the period of the synchronizing signal separated from the reproduced video signal having jitter, detects the difference from the reference synchronizing signal generated in advance, that is, the time base error amount, and then the RAM memory circuit. The signal with jitter read from is expanded by electronic zoom by the reciprocal of the detected time base error amount,
Alternatively, compress. As a result, it is possible to realize a video camera device capable of performing data compression processing and recording by removing the jitter from the input reproduced video signal with a simple circuit.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a video camera device according to a first embodiment of the present invention.

FIG. 2 is an internal configuration diagram of a digital signal processing circuit in the example of FIG.

FIG. 3 is a schematic configuration diagram of a video camera device according to a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a video camera device according to a third embodiment of the present invention.

5 is an explanatory diagram of signals in the example of FIG. 4. FIG.

[Explanation of symbols]

 101 lens 102 CCD image sensor 103 analog amplifier 104 video signal selection switch 105, 112 A / D converter 106 data compression / expansion circuit 107 digital signal processing circuit 108 hard disk drive 109, 113 D / A converter 110 microphone 111 audio signal switching Switch 114 Line input terminal 201 Luminance processing circuit 202 Color processing circuit 203 Y / C separation color demodulation circuit 204 Changeover switch 205 Subsampling circuit 206 Upsampling circuit 207 Color modulation circuit 204 Changeover switch 301 A / D converter 401 Digital sync separation circuit 402 counter 403 comparator 404 memory read pulse generation circuit 405 memory write pulse generation circuit 406 reference synchronization signal generation circuit 407 RAM memory Mori 408 Electronic zoom circuit 409 Reference clock generator

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical indication location H04N 5/956 H04N 7/13 Z 7/24 9/89 C 9/896 (72) Inventor Akihito Nishizawa Kanagawa Prefecture 292 Yoshida-cho, Totsuka-ku, Yokohama, Ltd. Hitachi, Ltd. Multimedia System Development Division (72) Inventor Tomoya Hoshi 1410 Inada, Hitachinaka City, Ibaraki Prefecture Hitachi, Ltd. Toshiro 292 Yoshida-cho, Totsuka-ku, Yokohama City, Kanagawa Prefecture Hitachi, Ltd. Multimedia System Development Division

Claims (9)

[Claims] 1. A selection switch for switching between an internal video signal and an external video signal, a signal processing circuit for adding at least a color signal and a luminance signal from the video signal selected by the selection switch, and the signal processing. A video camera device comprising: a data compression unit that removes a redundant portion of an output signal of a circuit and compresses data. 2. An image pickup device, a video signal processing circuit for processing a video signal read from the image pickup device, a microphone, an audio signal processing circuit for processing an audio signal from the microphone, the video signal processing circuit, and In a video camera device having a data compression unit that removes a redundant part of an output signal from an audio signal processing circuit and compresses data, the video camera device is arranged between the image pickup device and the video signal processing circuit, A first selection switch having a first video input terminal to which a video signal is supplied and a second video input terminal to which a video signal input from the outside is supplied; and the microphone and the audio processing circuit. A first audio input terminal which is arranged between the first audio input terminal to which the audio signal from the microphone is supplied and a first audio input terminal to which the audio signal input from the outside is supplied. And a second selection switch having an audio input terminal, and the video signal from the image pickup device and the audio signal from the microphone are processed by the video signal processing circuit and the audio signal processing circuit or input from the outside. A video camera device, characterized in that the first and second selection switches are used to select whether the video signal and the audio signal to be processed are processed by the video signal processing circuit and the audio signal processing circuit. 3. An image pickup device and an A / A for converting an analog image signal read from the image pickup device into a digital image signal.
A D converter, a video signal processing circuit for converting a digital video signal output from the A / D converter into a standard television signal, and a redundant portion of an output signal from the video signal processing circuit is removed to perform data compression. In the video camera device having a data compressing section, a first video input terminal arranged between the image sensor and the A / D converter, to which a video signal from the image sensor is supplied, and an external device. The second to which the input video signal is supplied
And a video signal input from the outside, the video signal from the image sensor being supplied to the video signal processing circuit via the A / D converter for signal processing. A video camera device, characterized in that the selection switch is used to select whether the signal is supplied to the video signal processing circuit via the A / D converter and processed. 4. An image pickup device and a first image signal converting device for converting an analog video signal read from the image pickup device into a digital video signal.
A / D converter, a video signal processing circuit for converting a digital video signal output from the first A / D converter into a standard television signal, and a redundant portion of an output signal from the video signal processing circuit. And a data compression unit for compressing data, the second A / D to which a video signal input from the outside is supplied.
A converter, an output signal from the first A / D converter, and an output signal from the second A / D converter are supplied, and an output signal from the first A / D converter is supplied. And an output signal from the second A / D converter, and a selection switch for supplying the signal to the signal processing circuit, wherein the video signal processing circuit outputs the output video from the image sensor. A video camera device for selecting whether to process a signal or a video signal input from the outside by the selection switch. 5. An image pickup device and a first image signal converting device for converting an analog video signal read from the image pickup device into a digital video signal.
A / D converter, a microphone, a second A / D converter for converting an audio signal from the microphone into a digital audio signal, and digital video signals from the first and second A / D converters And a signal processing circuit for converting a digital audio signal into a digital standard television signal,
A D / A converter that converts a digital standard television signal output from this signal processing circuit into an analog standard television signal, and a redundant portion is removed from the standard television signal output from the signal processing circuit to compress data. In a video camera device having a data compression unit for recording and a recording medium for recording video data and audio data compressed by the data compression unit, the video camera device is arranged between the image pickup device and the first A / D converter. And a first selection switch having a first video input terminal to which a video signal from the image sensor is supplied and a second video input terminal to which a video signal input from the outside is supplied, and the microphone And a second A / D converter, and a first audio input terminal to which an audio signal from the microphone is supplied, and an external input A second selection switch having a second audio input terminal to which an audio signal to be supplied is supplied, and the video signal from the image pickup device and the audio signal from the microphone are converted into a digital standard television signal by the processing circuit. The video signal and the audio signal input from the outside are converted by the signal processing circuit into a digital standard television signal by the first and second selection switches. apparatus. 6. An image pickup device and an A / A for converting an analog image signal read from the image pickup device into a digital image signal.
A D converter, a signal processing circuit for converting a digital video signal from the A / D converter into a digital standard television signal, and a digital standard television signal output from the signal processing circuit to an analog standard television signal. D / A converter, a data compression unit that removes redundant portions from the standard television signal output from the signal processing circuit, and compresses the data, and a recording medium that records the video data compressed by the data compression unit. A video camera device having: a first video input terminal arranged between the image sensor and the A / D converter, to which a video signal from the image sensor is supplied; Second signal is supplied
A first selection switch having a video input terminal of
The selection switch selects whether the video signal from the image pickup device is converted into a digital standard television signal by the processing circuit or the video signal input from the outside is converted into a digital standard television signal by the signal processing circuit. A video camera device characterized by being selected by. 7. An image pickup device and a first image signal converting device for converting an analog video signal read from the image pickup device into a digital video signal.
A / D converter, a signal processing circuit for converting the digital video signal from the first A / D converter into a digital standard television signal, and a digital standard television signal output from the signal processing circuit. A D / A converter for converting into an analog standard television signal, a data compression section for removing redundant parts from the standard television signal output from the signal processing circuit, and data compression, and a data compression section for compressing the data. In a video camera device having a recording medium for recording video data, a second A / D to which a video signal input from the outside is supplied.
Whether the converter and the output signal from the first A / D converter are supplied to the signal processing circuit or the output signal from the second A / D converter is supplied to the signal processing circuit. A video camera device, comprising: a selection switch for selecting. 8. The video camera device according to claim 1,
The signal processing circuit includes a reference clock signal generator, a synchronization signal generator that generates a reference synchronization signal based on the reference clock signal from the reference clock signal generator, and the internal video signal and the external video signal as digital video signals. An A / D converter for converting the signal, a sync separation circuit for separating a sync signal from the digital video signal converted by the A / D converter, and a digital video signal converted by the A / D converter A RAM memory circuit in which the digital video signal written and stored according to the reference clock signal of the reference clock signal generator is read out according to the reference clock signal of the reference clock signal generator; and a synchronization signal generated by the synchronization signal generator. And a difference detecting means for detecting a difference between the synchronization signal separated by the synchronization separation circuit and the difference signal. A video camera device, comprising: an electronic zoom circuit for performing time-axis correction on a digital video signal stored in the RAM memory circuit according to a correction amount based on the difference detected by the minute detecting means. 9. The video camera device according to claim 8, wherein the sync separation circuit separates a sync signal from an analog video composite signal supplied to the A / D converter.