JPS6046733B2 - Still image recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a still image recording device for obtaining a hard copy by inputting a still image video signal.

In recent years, with the rapid development of electronic technology, still image signals have come to be used in various devices.

For example, in a device using a microcomputer,
A cathode ray tube display device is connected as a terminal device, and various input conditions and processing results are displayed as still images. Although such cathode ray tube display devices can easily display and visually display various input conditions and processing results sent as video signals, they have the disadvantage that these information cannot be saved as hard copies. ing.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a still image recording device that can easily obtain a hard copy of a still image by inputting a still image video signal.

In order to achieve such an object, the present invention provides an address counter that counts vertical synchronization signals, loads the count output of this address counter into a preset counter every time a horizontal synchronization signal is supplied, and then outputs the count output from an oscillator. A still image is printed out from the dot printer by counting the dot clock and supplying the video signal to the dot printer in synchronization with the generation of the count-up signal that is output every time the preset counter reaches a predetermined value. It is something to do.

Hereinafter, a still image recording device according to the present invention will be explained in detail using the drawings. FIG. 1 is a block diagram of main parts showing one embodiment of a still image recording device according to the present invention, in which 1 is an address that is counted up every time a vertical synchronization signal VS included in a video signal is supplied. This address counter 1 is a counter and outputs a count value as a parallel signal.

2 is a delay circuit that delays the horizontal synchronizing signal HS included in the video signal by a predetermined time and outputs it; 3 is a one-shot that is triggered by the output of the delay circuit 2 and outputs a narrow pulse signal with a constant width as a load signal. A circuit 4 is a preset counter, and when a load signal is supplied from the one-shot circuit 3, the preset counter 4 counts the count output of the address counter 1 in parallel, and then outputs a dot clock output from the oscillator 5. are counted sequentially.

This preset counter generates a count-up signal when its count value reaches a predetermined value N. 6 is a one-shot circuit that is triggered by the vertical synchronization signal VS and generates an output signal with a predetermined pulse width; 7;
8 is an AND gate which inputs the horizontal synchronizing signal HS and the output of the one-shot circuit 6 and supplies a clear signal to the preset counter 4; 8 samples the video signal in synchronization with the count-up signal output from the preset counter 4; For example, 1 bit 8
It is a stage shift register, and the output signals of each stage are output in parallel.

Reference numeral 9 denotes a printer control circuit which sequentially inputs the 8-bit signal output from the shift register 8 and controls the dot printer 10 so as to sequentially print each bit as a dot in a horizontal row.

In a still image recording device configured as described above, when a still image video signal to be displayed on a cathode ray tube display device is supplied, for example as shown in FIG. Then, the address counter 1 counts up by 1 and a count value "1" is output.

Next, when the horizontal synchronizing signal HS is supplied, this horizontal synchronizing signal HS is delayed by a predetermined time in the delay circuit 2, and then triggers the one-shot circuit 3 to send out a load signal. When a load signal is generated from the one-shot circuit 3, the preset counter 4 loads the count value "1" of the address counter 1 in parallel according to the load signal. When the preset counter 4 completes loading the count value "1", it sequentially counts the dot clocks output from the oscillator 5 until it reaches a predetermined predetermined value N1, that is, the maximum number of dots in the horizontal scanning direction. Then, a count up signal is output. Therefore, in this case, the count-up signal output from the preset counter 4 specifies the dot (N-1) in the first horizontal scan of the still image video signal. When this count-up signal is supplied to the shift register 8, the shift register 8 samples the video signal at the time when the count-up signal is generated and shifts the sampled signal ("1" or "40"). Remember. Next, when the second horizontal synchronizing signal VH after the generation of the vertical synchronizing signal VS is supplied, a clear signal is first generated from the AND gate 7 and the preset counter 4 is cleared.
Further, the horizontal synchronizing signal VH is delayed by the delay circuit 2 for a predetermined time, that is, by the time until the preset counter 4 completes the clearing operation by the clear signal output from the AND gate 7, and then the one-shot circuit 3 is reset. and a load signal is output. When the load signal is generated, the preset counter 4 returns to the address counter 1.
Load the count signal "1", which is the same value as the previous time, output from the controller as a parallel signal. When the loading operation of the count signal gate "1" is completed, the preset counter 4 sequentially counts the dot clock signals supplied from the oscillator 5 in the same way as in the case described above, and when the count value reaches a predetermined value N, it issues a count up signal. Output. In this case, the preset value of preset counter 4 is "1" as before.
Therefore, the count-up signal is (
This means that the N-1)th dot position is specified.
When this count-up signal is supplied to the shift register 8, the shift register 8 samples the video signal at the time of generation of the count-up signal and shifts the sampled signal (゜゜1゛ or "0"). If this operation is performed every time the horizontal synchronization signal HS is generated, the video signal of the (N-1) dot portion of each horizontal scan, that is, the video signal displayed on the cathode ray tube display device as shown in Fig. 2, is stored. The video signals of the portions indicated by vertical dotted lines in the still image are sequentially extracted.The video signals sequentially extracted in this way are transferred to the shift register 8.
8 shifts in (number of stages of shift register 8,
In this case, it will be explained as 8 stages. ) Then, the printer control circuit 9 takes in the eight video signals output in parallel all at once, and then causes the dot printer 10 to print them out as a horizontal row of dots. By sequentially performing such operations, the portion shown as a horizontal dotted line in FIG. 3 is printed out. Next, when the horizontal synchronizing signal ■S is supplied, the address counter 1 counts up by one and outputs a count value "2". Therefore, the preset counter 4 is preset to "2" each time each horizontal scanning signal HS is supplied, and accordingly, the video signal at the N-2nd dot position in each horizontal scanning is taken out. are printed out sequentially or line by line. In this case, in the dot printer 10, the number of dots in the horizontal direction is fixed in terms of hardware, whereas the number of dots in the vertical direction is in the paper feeding direction, so it is possible to take an infinite number of dots. Therefore, by sequentially extracting the still images shown in FIG. 2 in the vertical direction from the right end and printing them out as hard copies as shown in FIG. 3, the horizontal scanning direction of the still images in FIG. The recording density can be set freely, and the resolution can thereby be greatly improved. In the above embodiment, the video signal is sampled by the count-up signal output from the preset counter 4, and after the sampled video signal is stored in the shift register, 8 bits are stored in units or rows. Although only the case where printout processing is performed has been described, the present invention is not limited to this, and it goes without saying that printout processing may be performed for each bit.

As explained above, the still image recording device according to the present invention has the following features:
An address counter that counts vertical synchronization signals and specifies addresses in the horizontal scanning direction is provided, and the output value of the address counter is preset to a preset counter every time a horizontal synchronization signal is supplied, and then a dot clock is supplied from an oscillator. is counted, and every time the count value of the preset counter reaches the maximum number of dots in the horizontal scanning direction of the video signal, a count-up signal is output, and the video signal is sequentially sampled by this count-up signal and printed from the dot printer. Since the still image signal is configured to output data, the still image signal can be easily extracted as a hard copy using a dot printer with a simple configuration.

Further, according to the present invention, resolution can be changed by changing the cycle of the dot clock output from the oscillator 5, and hard copies can be easily enlarged or reduced by changing the paper feed cycle of the dot printer. It has various excellent effects such as.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a still image recording device according to the present invention, FIG. 2 is a front view showing an example of a still image displayed on a cathode ray tube display device, and FIG. 3 is similar to FIG. FIG. 2 is a plan view showing an example of a hard copy of a still image produced by the device shown in FIG. 1...address counter, 2...delay circuit, 31...one shot circuit, 4...preset counter, 5...oscillator, 6... ...
・・One-shot circuit, 7・・And gate, 8・
...Shift register, 9...Printer control circuit, 10...Dot printer.

Claims (1)

[Claims] 1. An address counter that counts vertical synchronization signals,
a preset counter that presets the output signal of the address counter with a load signal generated in response to a horizontal synchronization signal, and after the preset is completed, counts a dot clock and outputs a count-up signal when a predetermined value is reached; A still image recording device comprising: sampling means for sampling a video signal in synchronization with generation of the count-up signal; and a dot printer for sequentially printing the sampled video signal.