JP3517952B2 - Video equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
The present invention relates to a video apparatus which digitally converts and stores the data in a memory, and digital-to-analog converts data read out from the memory to reproduce a still image. 2. Description of the Related Art In recent years, a method of analog-to-digital conversion of a video signal and storing it in a memory, and digital-to-analog conversion of data read from the memory to reproduce a still video signal has been frequently used. In this type of conventional still image reproducing means, a still request signal is generated by operating a key on a control panel of the apparatus main body or a key on a remote controller, and the video signal is converted from analog to digital according to the still request signal to a memory. The data stored and read from the memory is converted from digital to analog to reproduce a still image. FIG. 3 is a block diagram of a conventional video apparatus.
Is an analog to digital-to-analog conversion of video signals
Digital converter 2, a memory for storing digitally converted video data, 3 a digital-analog converter for digital-to-analog conversion of data read from the memory to obtain a still video signal, 4 a memory for analog-digital conversion A vertical synchronizing separation circuit for separating and outputting a vertical synchronizing signal V from a video signal to be written into a video signal. Still image request operation device 6 to be operated
The static request signal generating circuit 6 generates a static request signal ST2 at the timing of the vertical synchronizing signal V generated by the vertical synchronizing separation circuit 4 using the static accept signal ST1 generated by the static request signal ST1 as a trigger. A write request signal generating circuit for generating a write request signal WE at the timing of the vertical synchronizing signal V generated by the vertical synchronizing separation circuit 4 using the static request signal ST2 as a trigger. A signal switching circuit that switches between a real video signal and a still video signal using the request signal ST2 as a trigger. FIG. 4 shows a timing chart of signals of respective parts for reproducing a still picture by a conventional video apparatus. In the figure, (a) is a video signal, (b) is a vertical synchronization signal V of the vertical synchronization separation circuit 4, (c) is a still reception signal ST1 of the still video request operation device 5, and (d) is a still request signal generation circuit. 6 is a write request signal generation circuit 7
Is a still image signal of the digital-analog converter 3, and (g) is an image signal of the signal switching circuit 8. In FIG. 2D, t is an operation delay, and P is an operation point. [0005] In the reproduction of a still picture by a conventional picture apparatus, when a still picture requesting operation is performed while the picture signal B is being displayed due to an operation delay with respect to the picture signal A actually desired to be still, the picture signal is reproduced. Write request signal WE to C
Occurs, and the video signal C is reproduced as a still video. However, in the above-described conventional configuration, if the video signal A and the video signal C shown in FIG. 4 are almost the same, the desired video signal is reproduced as a still video. When the video signal A is completely different from the video signal C, the desired video signal is not reproduced as a still video. SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a video apparatus for absorbing a delay in operation and reproducing a video signal actually desired to be stopped as a still video. In order to achieve this object, a video apparatus according to the present invention converts a vertical synchronization signal from video data.
Vertical sync separation means for separate output and for still image request operation
A still image requesting means for outputting a still reception signal,
Based on the still image reception signal output by the still image request means,
Timing of vertical sync signal output by vertical sync separator
A static request signal output means for outputting a static request signal at
The vertical sync signal output by the vertical sync separation means can be arbitrarily
Output the write request signal, and
Of the write request signal based on the stationary request signal
Write request signal output means for inhibiting output;
Video data for each write request signal output by the signal output means.
A memory to be stored and an output from the stationary request signal output means.
Output of an actual video signal based on a still request signal
Signal switching to switch between output of still video signal extracted from
And a replacement means . With the above arrangement, the video signal is stored in the memory at an arbitrary time interval in advance, and the storing of the video signal in the memory is stopped by the stop request signal, thereby absorbing the operation delay. The video signal that is actually desired to be still is reproduced as a still video. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a video device according to an embodiment of the present invention. In the figure, reference numeral 1 denotes an analog-to-digital converter for converting a video signal from analog to digital, 2 denotes a memory for storing digitally converted video data, and 3 denotes digital-to-analog conversion of data read from the memory to obtain a still video signal. A digital-to-analog converter 4 is a vertical synchronizing separation circuit for separating and outputting a vertical synchronizing signal V from a video signal to be analog-to-digital converted and written into a memory. A still image request operation device 6 that generates a still image reception signal ST1 by a still image request operation of a key or the like, and a vertical synchronization separation circuit 4 that uses a still image reception signal ST1 generated by the still image request operation device 5 as a trigger.
A static request signal generating circuit 9 for generating a static request signal ST2 at the timing of a vertical synchronizing signal V generated from the vertical synchronizing signal V. A timing signal generating circuit 7 for generating a timing signal T to be taken out is a quiescent request signal ST2 generated by a quiescent request signal generating circuit 6.
, A write request signal generating circuit for generating a write request signal WE for inhibiting the timing signal T generated from the timing generating circuit 9, and a trigger 8 for the static request signal ST 2 generated from the static request signal generating circuit 6. This is a signal switching circuit that switches between a real video signal and a still video signal. The connection of signals in each block is the same as in the conventional example of FIG. FIG. 2 is a timing chart of signals of each section for reproducing a still image by the video apparatus in one embodiment of the present invention. Next, the operation will be described with reference to FIG. Note that T in FIG. 2C is a timing signal of the timing signal generation circuit 9. First, the digitally converted video data is the high level period (1/60 second) of the timing signal T at an arbitrary time interval generated from the timing signal generation circuit 9.
It is stored in the memory 2 by each write request signal WE. Therefore, video data obtained by digitally converting the video signal X is first stored in the memory 2 during the high level period WE1 of the write request signal WE. Next, the data is updated in the high level period WE2 of the write request signal WE, and video data obtained by digitally converting the video signal A is stored in the memory 2. A still image reception request signal ST1 is generated by a still image request operation using a key of a control panel of the main body or a key of a remote controller, and the vertical synchronization signal V generated by the vertical synchronization separation circuit 4 is triggered by the still image reception signal ST1. When the quiescent request signal ST2 goes high at the timing of, the write request signal WE goes low, and new writing to the memory 2 is prohibited. Therefore, the newly digitally converted video data is not stored in the memory, and the video signal A actually desired to be still is reproduced as a still video. As described above, according to the present invention, an operation delay can be absorbed and a video signal actually desired to be stopped can be reproduced as a still image.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a video device according to an embodiment of the present invention. FIG. 2 is a timing chart of signals of various parts of still image reproduction by the video device according to an embodiment of the present invention. FIG. 4 is a block diagram of a conventional video device. FIG. 4 is a timing chart of signals of various parts for reproducing a still image by the conventional video device. [Description of References] 1 Analog-to-digital converter 2 Memory 5 Still video request operation device 6 Still request signal Generator 7 Write request signal generator 9 Timing signal generator

Claims (1)

(57) [Claim 1] A vertical synchronizing signal is separated and output from video data.
And a still image that outputs a still reception signal in response to a still image request operation
Image request means , based on a still reception signal output by the still image request means
The timing of the vertical synchronization signal output by the vertical synchronization separation means
Request signal output means for outputting a static request signal by switching
If, optionally the vertical synchronizing signal the vertical sync separating means outputs
Counting and outputting a write request signal;
A write request signal based on the static request signal output by the output means
Write request signal output means for inhibiting the output of the write request signal;
A memory for storing video data; and a still request signal output by the still request signal output means.
Output of the actual video signal and the stillness taken out of the memory
A video device, comprising: signal switching means for switching between output of a video signal .