JPH118829A - Video signal recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the input of external video signals and also to attain the application of a nonvolatile memory by securing the synchronization of phases between the 2nd video signal inputted by a 2nd video input means and a synchronizing signal, separating a composite video signal into the luminance and chrominance signal components and performing switching among the output signals of a decoder, a video camera and a video signal recording/reproducing circuit respectively. SOLUTION: The video signals inputted from the outside are applied to an input terminal 11 and separated into the luminance and secondary carrier chrominance signals by a video signal processing circuit 12. A decoder circuit 13 decodes the secondary carrier chrominance signals included in the video signals into the color difference signals, and a phase correction circuit 14 corrects the time base fluctuation against the output luminance and color difference signals. A switch circuit 18 functions to perform switching among the video signals inputted from the terminal 11, the video signals of a video camera inputted from a digital signal processing circuit 17 and the VTR reproduced video signals inputted from a recorded/reproduced signal processing circuit 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording / reproducing apparatus, and more particularly to a video signal recording / reproducing apparatus capable of recording an input of a second video signal from outside simultaneously with a video camera circuit.

[0002]

2. Description of the Related Art A so-called movie product in which a video camera and a VTR are integrated has generally been a single-function product for recording video signals of a video camera. This is because the function of externally inputting and recording a video signal for the purpose of protecting copyright has been voluntarily restricted. However, in recent years, there has been a prospect of preventing illegal dubbing of software by a copy prohibition technique, and thus a movie equipped with an external video signal input function is appearing. On the other hand, due to the advancement of digital technology and the rapid spread of personal computers, digital cameras (still images are recorded as digital signals on a recording medium such as a semiconductor memory and output using a printer or other device. Inspired by the advent of image processing, a movie that can record still images and a movie that incorporates a semiconductor memory as a still image storage medium have been announced.

FIG. 3 is a diagram showing connections between internal blocks of a general movie. In the figure, reference numeral 15 denotes an input terminal of a video signal input from an imaging device such as a CCD, 16 denotes a signal processing circuit for demodulating an output signal from the input terminal 15 into a video signal composed of a luminance signal and a color difference signal, and 17 denotes a signal processing circuit. A digital signal processing circuit that performs digital signal processing on the output signal of the signal processing circuit 16 to realize zoom, camera shake correction, special functions, and the like. A digital signal processing circuit 20 converts a color difference signal from a video signal output from the digital signal processing circuit 17. An encoder circuit that modulates at a subcarrier frequency; 21, an output video amplifier that outputs an output signal of the encoder circuit 20 to a video signal output terminal 22;
An output terminal 23 performs signal processing on the video signal output from the digital signal processing circuit 17 and outputs the signal to a recording medium.
Is a recording / reproducing signal processing circuit that outputs the signals. For example, VHS
In the case of an analog VTR represented by a system video or an 8 mm system video, an FM modulation process is performed on a luminance signal,
The color signal is subjected to frequency conversion signal processing and the like. On the other hand, in the case of a digital VTR typified by the recently commercialized DVC format, signal processing such as data shuffling, compression / decompression, error correction, and encoding is generally performed. is there. As shown in FIG. 3, the input of a video signal is limited to a signal input from a video camera circuit, and a configuration in which an external video signal cannot be input is generally used.

[0004] On the other hand, a system as shown in FIG. 4 has been commercialized in part as a configuration capable of inputting a video signal from the outside. In FIG. 4, reference numeral 11 denotes an input terminal of an external video signal, 12 denotes a video signal processing circuit that separates a video signal input from the input terminal 11 into a luminance signal and a subcarrier chrominance signal,
Reference numeral 13 denotes a decoder circuit for demodulating a subcarrier chrominance signal of a video signal into a color difference signal, and reference numeral 14 denotes a phase correction circuit for correcting a change in a time axis with respect to a luminance signal and a color difference signal output from the decoder circuit 13. When performing time axis correction, generally, a signal with a stable time base, for example, a signal from a crystal oscillator or the like is used as a time axis reference signal. A switch circuit 18 switches a video signal to be recorded in the recording / reproduction signal processing circuit 23 between a video signal from a video camera circuit and a video signal from the external signal input terminal 11. As shown in FIG. 4, the video signal input from the input terminal 11 has its time base corrected by the phase correction circuit 14 and is recorded or reproduced by the recording / reproduction signal processing circuit 23.

Here, the configuration of the phase correction circuit 14 will be described with reference to FIG. In the figure, 701 is a video signal input terminal of the phase correction circuit 14, 702 is an AD converter that converts an analog video signal into a digital signal, 703 is a synchronization signal separation circuit that separates horizontal and vertical synchronization signals from the video signal, Reference numeral 704 denotes a detection circuit that detects a change in the time axis of the video signal by comparing the phase of the synchronization signal output from the synchronization signal separation circuit 703 with the reference clock, and 705 denotes a delay line that delays the video signal (for example, a dynamic memory). 706 and 707 are first clocks for delaying the output signal of the delay line 705 by one clock.
A second flip-flop 708 is a matrix circuit for calculating an output signal of the delay line 705 and output signals of the first and second flip-flops 706 and 707;
Is an output terminal of the phase correction circuit 14. In this configuration,
The delay line 70 is changed in accordance with a change in the time axis of the video signal detected by the synchronization signal separation circuit 703 and the detection circuit 704.
5, first and second flip-flops 706 and 70
7. The digital video signal from which the time axis jitter component has been removed is output to the output terminal 709 by changing the delay time of the video signal with the phase correction operation circuit comprising the matrix circuit 708.

There is also a system in which a still image is recorded by separately providing a recording medium (for example, a semiconductor memory) while being a movie using a magnetic tape medium. FIG. 5 shows the configuration in this case. In the figure, reference numeral 19 denotes a still image recording circuit whose input terminal is connected to the output of the encoder circuit 20 and whose output terminal is connected to the second input terminal of the switch circuit 18. That is, when a still image is recorded, a video signal output from the encoder circuit is captured in an analog signal area, and is similarly input as an analog video signal from the switch circuit 18 during reproduction.

Next, the operation of the still image recording circuit 19 will be described in detail with reference to FIG. In FIG. 6, 6
Reference numeral 11 denotes a luminance signal input terminal of the video signal, 615 denotes a color signal input terminal, 612 denotes a first AD / DA converter for digitally converting the luminance signal, and 616 denotes a second AD / DA for digitally converting the color signal. A DA converter, 613 is a matrix circuit for synthesizing a YUV or RGB signal from a luminance signal and a chrominance signal, 614 is a memory for temporarily storing one frame of video signal (generally, a dynamic memory is used), and 618 is image data. Digital signal processing circuit that compresses and decompresses (still image data is compressed by JPEG
Format is often used), 619 is a nonvolatile memory for storing compressed image data (a flash memory is often used recently in terms of cost and capacity), and 620 is a serial transmission of still image data Control circuit (for serial transmission, IrD
Infrared transmission such as A is mainly used, but RS232C and USB are often used), 621 is a driver receiver for driving a serial transmission line, and 622 is a serial signal output terminal.

As shown in FIG. 6, a video signal input as an analog signal is temporarily converted into a digital signal, and then converted into a JPE.
The data compression processing such as G is performed and recorded in a nonvolatile memory such as a flash memory. In recent years, while digital signal processing of video camera circuits and VTR circuits has been progressing, analog signals are used for input / output in the case of digital signals. For a video signal, two signals of a luminance signal and a chrominance signal are required, and for input and output, four signals are sufficient. For a digital video signal, eight luminance signals, eight color signals, and two synchronization signals are required, for a total of 18 signals.
There are 36 for input and output. This is because it is often difficult to output necessary signals once an integrated circuit is formed due to the limitation of the number of terminals of the LSI.

[0009]

However, in the above-mentioned conventional configuration, the external input video signal is recorded on the VTR, and the video signal of the video camera is recorded on the VTR and the nonvolatile memory as the second recording medium. However, there is a problem that an external video signal cannot be recorded in a nonvolatile memory.

The present invention has been made in view of the above problems, and provides a video signal recording / reproducing apparatus capable of externally inputting a video signal and using a nonvolatile memory as a second recording medium.

[0011]

According to the present invention, there is provided a video camera circuit for electrically converting optical information into a video signal comprising a luminance signal and a baseband chrominance signal. A video signal recording and reproducing circuit for recording or reproducing from a recording medium a recording medium, an encoder circuit for modulating a baseband color signal to a subcarrier color signal, and a decoder circuit for demodulating the subcarrier color signal to a baseband color signal, An input unit for a second video signal other than the video camera unit, a phase correction circuit for synchronizing a second video signal input from the input unit with a synchronization signal serving as a reference of the video signal recording and reproducing circuit, A video signal separation circuit for separating a composite video signal on which a luminance signal and a subcarrier chrominance signal are superimposed into a luminance signal component and a chrominance signal component; The output signals of the video signal recording and reproducing circuit of Okamera circuit comprising a switch circuit for switching respectively, in which a video signal recording and reproducing circuit is connected to record the output signal of the switch circuit.

With such a configuration, it is possible to obtain a video signal recording / reproducing apparatus capable of inputting a video signal from the outside and using a nonvolatile memory as the second recording medium.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention provides a video camera circuit for electrically converting optical information into a video signal composed of a luminance signal and a baseband chrominance signal, and a video camera circuit for converting the video signal. A video signal recording / reproducing circuit for recording on or reproducing from a recording medium; an encoder circuit for modulating a baseband chrominance signal to a subcarrier chrominance signal; a decoder circuit for demodulating the subcarrier chrominance signal to a baseband chrominance signal; An input unit for a second video signal other than the camera unit, a phase correction circuit for synchronizing a phase of the second video signal input from the input unit with a synchronization signal serving as a reference of the video signal recording and reproducing circuit, and a luminance signal Signal separation circuit for separating a composite video signal on which a chrominance signal and a subcarrier chrominance signal are superimposed into a luminance signal component and a chrominance signal component, an output signal of a decoder circuit, and a video camera circuit A switch circuit for switching between an output signal and an output signal of a video signal recording / reproducing circuit, respectively, wherein the video signal recording / reproducing circuit is connected so as to record the output signal of the switch circuit. A video signal can be input from the outside, and a nonvolatile memory can be used as the second recording medium.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a block diagram illustrating a configuration of a video signal recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 1, the same reference numerals are given to the same components as those in the related art, and description thereof will be omitted. The switch circuit 18 includes a video signal input from the external video signal input terminal 11, a video camera video signal input from the digital signal processing circuit 17, and a recording / reproducing signal processing circuit 23.
It operates so as to switch between a VTR playback video signal input from the VTR. 119 is a still image recording / reproducing circuit.

FIG. 2 shows a detailed configuration of the still image recording / reproducing circuit 119. In the figure, reference numeral 201 denotes an input terminal of a video signal;
Is a switch circuit, 206 is a video signal output terminal, 207
Is a semiconductor memory such as a dynamic memory capable of storing at least one field of a video signal; 208 is a nonvolatile memory such as a flash memory capable of storing digital data corresponding to a plurality of still images; An image data compression / expansion circuit for compressing / expanding digital data of a still image in, for example, the JPEG format;
4 is a signal generation circuit for generating a switching signal for controlling the control signal No. 4.

In FIG. 2, when a still image is recorded in the non-volatile memory 208, one frame of the video signal input from the input terminal 201 is temporarily stored in the semiconductor memory 207. Next, the image data compression / decompression circuit 209 compresses the image data for one frame stored in the semiconductor memory 207 to a smaller data size.
Further, the compressed image data is stored in the nonvolatile memory 208.
To save. At this time, the reason for using the non-volatile memory 208 is that the normal semiconductor memory stores data while power is supplied, but once the power is turned off, the stored data is lost. This is because a nonvolatile memory such as a flash memory has a characteristic that data is stored even when the power is turned off. At the present time, since the flash memory has a considerably long programming time of about 500 msec per still image, it is necessary to temporarily store the flash memory in a high-speed memory such as a dynamic memory. In addition, at the present time, the price of the non-volatile memory is considerably high at about 400 yen per still image without data compression.
Data compression processing such as JPEG is indispensable.

Next, the signal generating circuit 210 generates a switching control signal for the switch circuit 204. The signal generating circuit 210 outputs the video signal input from the input terminal 201 to the output terminal 206 as it is, Switching between outputting the output video signal to the output terminal 206 can be performed. By controlling the switching of the switch circuit 204 within one screen, the semiconductor memory 207 is displayed on the moving image input from the input terminal 201.
It is also possible to superimpose (so-called picture-in-picture) the still images stored above. Further, since the output of the still image recording / reproducing circuit 119 is connected to both the encoder circuit 20 and the recording / reproducing circuit 23, a still image can be recorded on a tape medium, and a video camera video signal and The above-mentioned picture-in-picture can be realized with any of the external input video signals, and the picture-in-picture image can be recorded on a tape medium.

[0018]

As described above, according to the present invention, a switch for switching between input of an external video signal, input of a video camera video signal, and input of a VTR playback video signal is provided.
By connecting the output of the switch circuit to the input terminal of the still image recording circuit and connecting the output signal of the still image recording circuit to the input terminal of the VTR, in addition to the basic usage of the conventional movie, A video signal can be recorded and reproduced in the nonvolatile memory, and at the same time, a still image can be superimposed on the video signal (so-called picture-in-picture). Furthermore, it is also possible to record a still image on a tape medium, and it is possible to realize the above-described picture-in-picture with both a video camera video signal and an externally input video signal, and to convert a picture-in-picture image. It becomes possible to record on a tape medium. The present invention has an excellent effect of providing a movie configuration in which a video signal can be input from the outside and a nonvolatile memory can be used as the second recording medium.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a video signal recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a still image recording / reproducing circuit according to an embodiment of the present invention;

FIG. 3 is a block diagram showing a configuration of a movie which is a conventional video signal recording / reproducing apparatus.

FIG. 4 is a block diagram showing a configuration of a movie which is a conventional video signal recording / reproducing apparatus.

FIG. 5 is a block diagram showing a configuration of a movie which is a conventional video signal recording / reproducing apparatus.

FIG. 6 is a block diagram showing a configuration of a still image recording / reproducing circuit in a conventional video signal recording / reproducing device.

FIG. 7 is a block diagram showing a phase correction circuit in a conventional video signal recording / reproducing apparatus.

[Explanation of symbols]

 Reference Signs List 11 input terminal 12 video signal separation circuit 13 decoder circuit 14 phase correction circuit 15 input terminal 16 signal processing circuit 17 digital signal processing circuit 18 switch circuit 19 still image recording circuit 21 encoder circuit 22 output video amplifier 23 recording / playback signal processing circuit 201 input Terminal 204 Switch circuit 206 Output terminal 208 Non-volatile memory 209 Image data compression / expansion circuit 210 Signal generation circuit 611 Luminance signal input terminal 612 First AD / DA converter 613 Matrix circuit 614 Memory 615 Color signal input terminal 616 Second AD / DA converter 618 Digital signal processing circuit 619 Non-volatile memory 620 Control circuit 621 Driver receiver 622 Serial signal output terminal

Claims (1)

[Claims] 1. A video camera circuit for electrically converting optical information into a video signal composed of a luminance signal and a baseband chrominance signal, and a video signal recording / reproduction for recording / reproducing the video signal on / from a recording medium. Circuit, an encoder circuit for modulating the baseband chrominance signal to a subcarrier chrominance signal, a decoder circuit for demodulating the subcarrier chrominance signal to a baseband chrominance signal, and a second video signal input means other than the video camera unit A phase correction circuit for synchronizing a second video signal input from the input means with a reference synchronization signal of the video signal recording / reproducing circuit, and a luminance signal and a subcarrier chrominance signal are superimposed. A video signal separation circuit for separating a composite video signal into a luminance signal component and a chrominance signal component, an output signal of the decoder circuit, an output signal of a video camera circuit, and a video signal A video signal recording / reproducing apparatus, comprising: a switch circuit for switching between an output signal of the recording / reproducing circuit; and a video signal recording / reproducing circuit connected to record the output signal of the switch circuit.