JPS60223392A - Printer of television signal - Google Patents

Abstract

PURPOSE:To print out an image correctly by using a horizontal oscillation pulse and a vertical oscillation pulse generated by a television receiver. CONSTITUTION:A video signal v1 supplied from the television receiver is sampled by using a clock pulse (p) at an A/D converter 1 and converted into a gradation density signal d1. A write control circuit 3 controls so as to write a gradation density signal for 280 horizontal picture elements and 234 vertical lines to correct addresses of a video image memory 2. The gradation density signal d1 is written in the normal address by using a horizontal oscillation pulse s1 and a vertical oscillation pulse s2 formed by the television receiver having an automatic frequency control circuit so as to attain address count.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a printer device for printing a composite video signal of a television receiver.

[Prior art]

Generally, when a cooking program is being broadcast on a television or receiver, you may want to write down the menu list and ingredients displayed on the screen, but conventional television receivers do not allow you to do so. Viewers have to take notes on the menu list, ingredients, etc. while looking at the screen each time.
It was very inconvenient. Furthermore, if the cooking program is recorded on a VTR, it can be played back again, but even in that case, it is necessary to search for the necessary screen and play it back, which is a cumbersome operation.

Therefore, the inventor of the present invention has determined that the gradation density signal of the image on the television screen is R.
We have already developed a television (1%) printer device that can automatically make a hard copy of television screen images by writing to AM and then reading it.

By the way, when a television signal is received under a weak electric field, noise is superimposed on the synchronization signal part of the composite video signal that is output to the printer, and as a result, the image on the television screen cannot be printed out correctly. There was a problem with it disappearing.

[Summary of the invention] This invention was made in view of the above-mentioned drawbacks.
The present invention provides a printer device that correctly prints out images by using horizontal oscillation pulses and vertical oscillation pulses formed by a television receiver.

[Embodiments of the invention] Hereinafter, the present invention will be explained with reference to the drawings which are one embodiment.

In the figure, 1 is an A/D converter to which a video signal 9V1 of the composite video signal is supplied, A/D converts this signal and outputs, for example, a 4-bit gradation density signal di, and 2 is a gradation density signal. d1, and 3 is a write control circuit for writing the gradation density signal d1 into the video memory 2, in which a horizontal oscillation pulse 81 and a vertical oscillation pulse 82 are formed by a television receiver having an automatic frequency control circuit.
is configured to be supplied separately from the video signal V1. 4I-i central processing unit (hereinafter referred to as CPU) gives write command 02 to write control 9 circuit 3 in response to copy command C1 from copy key 5, and outputs read address a to video memory 2. Then, the read data d2 from the video memory 2 is output as print data d3. 6 is a printer that prints out the print data d3; 7 is a clock pulse generating circuit that supplies tarock pulses p to the A/D converter 1 and the write control circuit 3;

In this configuration, a video signal v1 supplied from a television receiver is sampled by a clock pulse p in an A/D converter 1, and converted into a gradation density signal dl. This gradation density signal d1 is written into the video memory 2 at the timing of the clock pulse p based on the write command c2.

This write control circuit 3 performs control so that gradation density signals for 280 pixels in the horizontal direction and 234 lines in the vertical direction are written to the correct address in the video memory 2.

The write command 02 of the write control circuit 3 is issued from the CPU 4 when the viewer operates the copy key 5.

When the writing to the video memory 2 is completed 14 times, the CPU 4 gives the read address a to the video memory 2 and outputs the gradation density signal d2. This gradation density signal d2 is the print data d3
As a result, the printer 6 prints out the image on the television screen.

By the way, noise is superimposed on the double-eight image signal due to the reception in the Fi weak electric field under a weak electric field, and this noise is also included in the horizontal and vertical signals. If the write control circuit 3 is controlled using the signal, the write control circuit 3 will count the noise as a horizontal synchronization signal and a vertical synchronization signal, and there is a possibility that a deviation will occur in the printed image.

Therefore, by performing address counting using the horizontal oscillation pulse 81 and vertical oscillation pulse 82 formed by a television receiver having an automatic frequency control circuit, the video memory 2 is Similar to the state, the gradation density signal di is positive and the normal at°
This makes it possible to print a normal screen without being affected by noise.

Further, it is possible to achieve an economical configuration without requiring a circuit for forming the horizontal oscillation pulse 81 and the vertical oscillation pulse e2.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to correctly print out television images, and the present invention has great practical value.

[Brief explanation of drawings]

FIG. III is a block diagram showing a printer device for television signals, which is an embodiment of the present invention. ■...A/Dir, converter, 2...video memory, 3...writing control circuit, 4...CPU (reading control circuit), 6...printer.

Claims (1)

[Claims] A printer device that is attached to a television receiver having an automatic frequency imJ control circuit and prints out a composite video signal of the television receiver, and is an A/D conversion device that converts the video signal of the composite video signal from A/D. vessel and the A
a video memory that stores the gradation density signal from the /D converter; and a write control circuit that is driven by horizontal oscillation pulses and vertical oscillation pulses formed in the television receiver and controls writing to the video memory. A television signal printer apparatus comprising: a readout control circuit that reads out the gradation density signal from the video memory; and a printer that prints out the read out gradation density signal.