JPS6098779A - Printer device of television signal - Google Patents

Abstract

PURPOSE:To make it possible to precisely print out a video of a television screen by generating a read pulse and by starting to print immediately after a writing of a tone density signal to a video memory. CONSTITUTION:For a composite video signal V1, horizontal and vertical synchronizing signals S1 and S2 are extructed a synchronizing separation circuit 7, becomes a video signal V2 and inputted to an A/D converter 1. The converter 1 samples the signal V2 and output a tone density signal d1 by using a clock pulse from a clock pulse generating circuit 9. When a copy key 6 is ON, a copy command signal C1 is supplied to a CPU4. The CPU4 outputs the chattering prevention signal and a write command C2 and operates a write control circuit 3. The circuit 3 gives horizontal and vertical addresses to a video memory 2 in accordance with signals S1 and S2 and writes a signal d1 in the video memory 2. When the writing ends, the print start signal is generated and the CPU4 gives a read address (a) to the memory 2, reads the tone density d2, sends this to a printer 5 as a printing data d3 and the television video is printed out.

Description

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

Generally, when using a television receiver, for example, when a cooking program is being broadcast, you may want to leave the menu list, ingredients, etc. displayed on the screen, but conventional television receivers However, viewers had to take notes on the menu list, ingredients, etc. while looking at the screen each time, which was extremely inconvenient. Furthermore, if the above-mentioned 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 name of the present invention is TV II! A printer for a television receiver that can automatically make a hard copy of the image on the television screen by writing the gradation density of the image on the Ji side into RAM and then outputting it.
has already been developed. However, in such a printer device, when selecting an image to be printed, it is necessary to operate a push button switch, etc., but normally the switch has a chattering effect, so the leading edge of the image is not printed continuously. It looked unnatural.

This invention was made in view of the above-mentioned points, and provides a television signal printer device that starts printing immediately after the writing to the video memory is completed, and can correctly print out the video on the television screen. is intended to provide.

An embodiment of the present invention will be described below with reference to the drawings.

14 shows a television signal printer apparatus according to an embodiment of the present invention, in which 7 is a synchronization separation circuit that separates horizontal and vertical synchronization signals s1 and s2 from a composite video signal V1 from a television receiver; 8
1 is an AFC circuit that applies an automatic frequency control filter (hereinafter referred to as AFC) to the horizontal synchronization signal s1; 1 is an A/D converter for the video signal v2 from the synchronization separation port 11δ7;
For example, an A/D converter that outputs a 4-bit floor '4jFAIJ degree number d1, 2 a video memory that stores the gradation density transformation signal @d1, 8 an AFC circuit 8 output S1 and a vertical synchronization color code S2. A write control circuit 4 controls writing to the video memory 2 in response to a write command C2 using a write command C2, and 4 provides a write command C2 to the write control circuit 8 in response to a copy command C1 from the copy key 6, 2 is a CPU 5 which outputs a read address a and outputs read data d2 from the video memory 2 as print data d8;
is a printer that prints out the read print data d8. Reference numeral 9 denotes a clock pulse generation circuit that supplies clock pulses p to the A/D converter 1 and the write control circuit 3.

Next, the operation will be explained. From the composite video signal v1 from the television receiver, the horizontal and vertical synchronization signals S1+s2 are extracted by the synchronization separation circuit 7, and the resulting video signal v2 is input to the A/D conversion "l+'l1." The D converter 1 is a clock pulse generation circuit 9
Video using the clock pulse p! Sampling b number v2 and gradation density 4? , the number d1 is output. The write control circuit 3 writes the above-mentioned corner koji and iIn degree transformation d1 into the video memory 2 at the timing of the above-mentioned clock pulse p in response to a write command c2.

This programming control circuit i1"18 is horizontally 280iihI
Control is performed so that a step signal of 284 lines in the vertical direction is written to the correct address in the video memory 2. The write command C2 of the write control circuit 8 has a visual field of 19 m.
% is issued from the CPU 4 when the copy key 6 is operated. This operating state is shown in FIG.

That is, when the copy key 6 is turned on, as shown in FIG.
A copy command signal c1 accompanied by a chattering phenomenon is supplied to the CPU 4 as shown in FIG. This CPU4 has a second
The vertical ILi synchronization signal s2 shown in Figure (b) is supplied, and when the vertical ILi synchronization signal s2 rises, copy ((1
A chattering prevention signal as shown in FIG. 2 (C) is generated depending on the presence or absence of the signal c1. When the vertical direction signal is supplied in this period, the write command c 2
This write command c2 is divided by jIY by the next vertical synchronization number 18, and is output as shown in FIG. 2(d). The copy key operation condition 1m (M) is generated and the output of the write command c2 is prevented until the copy key is released.As a result, the operation of the copy key 6 accompanied by chattering occurs. It is also possible to write the immediately following video signal to the video memory 2. When the image memory 2 is finished storing, an output pulse as shown in FIG. 2(f) is generated accordingly. Then, the CPU 4 gives the read address a to the video memory 2 and reads out the floor 1, 1 density signal d2.

This gradation density signal d2 is outputted to the printer 5 as print data d8, and as a result, the printer 5 prints out the image on the television screen.

In addition, in this embodiment, the device receives a composite video signal from the television receiver main body, and synchronously separates it inside the printer device to obtain the video signal and horizontal and vertical synchronization signals. It can be connected with just one cable to the video output terminal that is often installed on John receivers these days.

As described above, according to the television signal printer device l'i according to the present invention, it is important to print out the image immediately after the writing to the video memory is completed, so that the image on the television screen can be correctly printed. It has the effect of letting you out.

[Brief explanation of drawings]

Figure 11 is a block diagram showing a television signal printer according to an embodiment of the present invention, and Figure 2N shows the operating characteristics in Figure 1. 1... A/D friend device, 2... Isthmus memory, 8...
AFC circuit, 8...1) Inclusive wandering control circuit, 4...C
PU (611 readout circuits), 5...Printer. Agent Masuo Oiwa

Claims (1)

[Claims] (1) A printer device that prints out a video signal based on a television composite video signal, comprising an A/1) converter that converts the video signal of the composite video signal from A/D;
A video memory that stores the gradation density signal from the acid A/D converter, a copy key that issues a print command, and a write that detects the vertical synchronization signal of the composite video/signal and controls writing to the video memory. The device includes a control circuit, a readout control circuit that reads the gradation density signal from the video memory, and a printer that prints out the read gradation density signal, and writes data to the video memory based on the operation of the copy key. A printer device for television signals, characterized in that the printer is driven after the writing is completed.