JPS59226573A - Printer for television signal - Google Patents

Abstract

PURPOSE:To write only gradation density signals necessary for printing out in an image memory by controlling a writing address by a 1-line print number counter and a writing address counter. CONSTITUTION:When a copy key is turned on, a video signal V is written in an image memory 2 by control of a writing address counter 5. At this time, when a horizontal pulse Ph is inputted to a 1-line print number counter 4 and a counter 5, the counter 4 is reset by rise of Ph, and counters 4, 5 start counting of clock pulse Pc by fall. When the value of the counter 4 becomes 280, that is, when the counter 5 gives the address signal of 1 line to the memory 2, counting is stopped by the signal Sp of the counter 4. Such operation is repeated until a vertical pulse Pv is inputted, and printed out in a printer 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printer device for television signals.

Generally, when a cooking program is being broadcast on a television receiver, you may want to write down the menu list and ingredients displayed on the screen. This was extremely inconvenient as the person had to take notes on the menu list, ingredients, etc. while looking at the screen each time. In addition, if the cooking program mentioned above 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 statically, which is a cumbersome operation. .

Therefore, the inventor of the present invention has proposed a printer device for a television receiver that can automatically make a hard copy of the television screen image by writing the gradation density signal of the television screen image into the RAM and then not reading it out. It is already being developed.

In addition to the video signal, the television signal includes various control signals such as a horizontal synchronizing signal for each scanning line and a vertical synchronizing signal for each field.

These various control signals do not need to be printed out by the printer device, and from the point of view of effective use of the RAM, when writing the television signal to the RAM, the control signals are It is desirable to write the necessary signal numbers on the printout except for.

The present invention has been made in view of the above points, and includes: (1) providing a 1-line printing number counter for determining the number of pixels of a video signal to be printed out in a scanning line; television signal horizontal,
It is an object of the present invention to provide a television signal printer device that can write only a video signal to be printed out to a video memory by providing a write address counter that controls writing of television signals to a memory using vertical pulses. It is said that

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

The drawing shows a television signal printer apparatus according to an embodiment of the invention. In the figure, ■ is a television video signal, 1 is an A/D converter that converts this video signal ■ into a gradation density signal, and 2 is a video memory that stores this A/D-converted gradation density signal. be. 3 is a clock pulse Pc with a higher frequency than the horizontal synchronization signal of the television signal.
Pv is a positive vertical pulse generated every vertical period of the television signal,
Ph is a positive horizontal pulse generated every horizontal period of the television signal. 4 is the horizontal pulse ph
When the clock pulse Pc is input, the clock pulse Pc starts counting, and when the count value reaches "280", which is the number of prints on one line of the printer output, the operation stop signal Sp is sent.
5 is the vertical pulse 1) which is reset when the vertical pulse y is input, and from when the horizontal pulse pH is input, it counts the address of the video memory 2 and inputs the operation stop signal Sp. This is a built-in address counter that stops counting addresses after that address. Further, 6 is a CPU that does not read out the gradation density signals in the video memory 2, and 7 is a printer that prints out the gradation density signals read out by the CPU 6.

Next, the operation will be explained.

When the copy key (not shown) is turned on in this device, the video signal (2) is converted by the A/D converter 1 into a gradation density signal which is digital data, and is written into the video memory 2. The writing of the tone density signal % into the video memory 2 is controlled by a write address counter 5, and the tone density signal necessary for printing out is written.

That is, first, a vertical pulse Pv is applied to the write address counter 5.
When the write address counter 5 is manually inputted, the write address counter 5 is reset and the count value becomes "0" by the rise of the write address counter 5, and the reset state is canceled by the fall of the write address counter 5.

Next, when the horizontal pulse ph is input to the 1-line printing number counter 4 and the write address counter 5, the 1-line printing number counter 4 is reset by the rise of the horizontal pulse ph, and the count value becomes "0", and The one line printing number counter 4 is activated by the fall of the pulse ph.
The write address counter 5, which has been reset by the vertical pulse Pv as described above, simultaneously starts counting the clock pulse PC from "l", and the write address counter 5 uses this count value as an address signal and sends it to the video memory 2. A row 1 column address strobe signal (CRAS signal, CAS signal) which instructs the write timing of the data is applied to the video memory 2.

Then, the video memory 2 decodes the address signal from the write address counter 5 using a built-in address decoder to obtain the X and Y addresses, and then outputs the RAS.
, the gradation density signal is written at the X and Y address positions at the timing of the CAS signal. Then, when the counter value of the 1-line printing number counter 4 reaches '280', that is, when the above-mentioned address counter 5 registers the 1-line printing number counter 4,
When a large signal is applied to the video memory 2, the one-line printing number counter 4 outputs an operation stop signal Sp, which causes the write address counter 5 to stop counting up and outputting address signals.

At this time, the count of the 1-line printing number counter 4 and the self-locking pulse pc is stopped by 1.

In this way, the video memory 2 stores the portion to be printed out of the signal of one horizontal scanning line, that is, 280
Data for pixels is written.

Then, when the next horizontal pulse ph is further input to the 1-line printing number counter 4 and the write address counter 5, the 1-line printing number counter 4 is reset and counted by the rise of the horizontal pulse ph in the same way as above. The value becomes "0", and due to the falling edge, both counters 4 and 5 start counting the clock pulse Pc at the same time. At this time, the l line printing number counter 4 has been reset as described above, so it is again changed from 1" to "280".
However, the write address counter 5 starts counting from the next line after the final count value of "280", that is, 281, and when it counts up to one line, that is, "560," The address count is stopped by the operation stop signal sp of the line printing number counter 4.Therefore, the image memory 2 stores the gradation density signal of the previous line and the next line's level δ)la.
A density signal is written, and such a writing operation is repeated until the next vertical pulse Pv is input.

The gradation density signal for one field written in the video memory 2 is read out by the CPU 6 and printed out by the printer.

Next, the effects will be explained.

In the apparatus of this embodiment, the write address is controlled by the 1-line printing number counter 4 and the write address counter 5, so that only the gradation density signal necessary for printing out is written into the video memory 2. The capacity of the memory 2 can be very small.

Also, if the number of lines printed is 2, for example "256",
If it is a value, the address counter detects that all the lower 8 bits of the output of the write address counter 5 become "O", and at this time the address counter of the write address counter 5 is temporarily stopped to print. It is possible to write only the gradation density signal necessary for output, but since the number of pixels in one line of the television signal required by the printer is "280", not 2", in such a case, If it is attempted to control the write address counter 5 by detecting the number of prints per line from the address signal, the configuration becomes very complicated.

However, according to the apparatus of this embodiment, since the l-line printing number counter 4 is separately provided to control the writing by the write address counter 5, it is possible to print out each scanning line with a very simple configuration. Only necessary gradation density signals can be continuously written into the video memory 2, the memory 2 can be used effectively, and the device can be made inexpensive.

As described above, according to the television signal printer device according to the present invention, the address count by the write address counter is controlled by the 1-line printing number counter, and only necessary signals of the video signal are written into the video memory. As a result, the image memory can be used effectively, its memory capacity can be small, compact images can be printed out, and the configuration of the device is also very simple.

[Brief explanation of drawings]

The drawing is a block diagram of a television signal printer apparatus according to an embodiment of the present invention. 2...Video memory, 4...1 line printing number count, 5...Write address counter, 6...CPU
(readout control circuit), 7...blink. Agent Masuo Oiwa

Claims (1)

[Claims] +1) A video memory that stores television signals,
A 1-line printing number counter that starts counting clock pulses when a horizontal pulse of a television signal is input, and generates an operation stop signal when the count value reaches the number of 1-line printing of the printer output; a write address counter that is reset when the vertical pulse of the signal is input, counts addresses in the video memory from when the horizontal pulse is input, and stops the addresses from 1 to 1 when the operation stop signal is input; A printer device comprising: a readout control circuit that reads out the television signal in the video memory; and a printer that prints out the readout television signal.