JPS61277291A - Printer device for television receiver - Google Patents

Abstract

PURPOSE:To print out a gradation density signal by providing a central processing unit for outputting a writing command to a writing control circuit by a command from a print key and reading the gradation density signal in an video memory and a printer. CONSTITUTION:An R.G.B. digital signal of TTL level is written in an video memory 1 in a timing of a clock P as a weight of G=2<2>, R=2<1>, B=2<0>A, writing control circuit 2 controls, by the use of horizontal and vertical synchronizing signals S1, S2 synchronous with the R.G.B., to write the R.G.B signal in a correct address of the video memory 1 as a gradation density signal of 640 picture elements in a horizontal direction and 234 lines in a vertical direction. When the writing to the video memory 1 is completed, a CPU 3 gives an address (a) to the video memory 1, reads a gradation density signal d2, and inputs to a printer 4 as a printing data d3. An R.G.G. primary color signal can be precisely printed out with a variable density of black and white.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer device for a television receiver.

(Prior Art) Generally, when a cooking program is being broadcast on a television receiver, it may be desirable to write down the menu list, ingredients, etc. that are displayed on the screen. With John receivers, viewers had to look at the screen and take notes on the menu list, ingredients, etc. each time, which was very inconvenient.Furthermore, if the cooking program mentioned above was recorded on a VTR, it could be played back again. However, even in this case, it is necessary to search for the necessary screen and play it back statically, which is complicated.

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 printer device for a television receiver that can automatically make a hard copy of television screen images by writing to AM and then reading it.

[Problem that the invention seeks to solve]

By the way, signals from personal computers and the like are not composite video signals, but R-G-B primary color signals at the TTL level are connected to a monitor TV to display clear images on the screen. It would be very convenient for users if this screen could also be printed.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a printer device for a television receiver that is capable of printing out R-G-B primary color signals at TTL level in the printer device as described above.

[Means for solving problems]

A printer device for a television receiver according to the present invention includes:
The R-G-B primary color signal at the TTL level is stored in the video memory using a reference clock in a personal combinator, etc., and the R-G-B primary color signal is changed to black and white shading and printed out. It is.

[Effect]

In this invention, an R-G-B primary color signal is stored in a video memory as a gradation density signal using a clock synchronized with the signal, and this gradation density signal is printed out as print data by a CPU.

〔Example〕

Here, in explaining the present invention in detail, its basic principle will be explained.

Figure 2 shows the relationship between R-G-B color signals and luminance signals.
V standard), Figure 3 shows white-1,00 and white-7,00
It shows the brightness ratio of each color when

Fig. 4 shows an example of R-G-B expressed in binary numbers, and the luminance value of each color when G corresponds to a weight of 22, R corresponds to a weight of 21, and B corresponds to a weight of 20. It shows. As is clear from FIGS. 3 and 4, approximation can be achieved even if RGB is replaced with binary numbers.

Hereinafter, one embodiment of the present invention will be explained with reference to FIG.
is a write control circuit that controls writing to the video memory 1 in response to a write command C2 from the CPU 3, which will be described later;
3 gives a write command C2 to the write control circuit 2 in response to the print command C1 from the print key 5, outputs a read address a to the video memory 1, reads data from the memory 1, and reads the read data. This is a CPU that outputs d2 as print data d3. 4 is a printer that prints out the read print data d3.

In addition, the clock P is a clock pulse synchronized with R, G-B, which is supplied from the outside, and this clock pulse P
is supplied to the write control circuit 2.

The horizontal synchronizing signal St and the vertical synchronizing signal S2 are supplied from the outside in the same manner as described above, and these are also supplied to the write control circuit 2.

Next, the effects will be explained.

The TTL level R-G-B digital signal is
The above clock P is used as the weight of 22, R-21, B-20.
The write control circuit 2 writes to the video memory 1 at the timing of, for example, 640 pixels in the horizontal direction and 234 lines in the vertical direction using horizontal and vertical synchronization signals S1 and S2 synchronized with R-G-B. R-G- as a tone density signal
Control is performed to write the B signal to the correct address of the video memory 1, and the write command C2 of the write control circuit 2 is sent to the CPU when the user operates the print key 5.
It emanates from 3.

When the writing to the video memory 1 is completed, the CPU 3 gives the read address a to the video memory 1, and reads the gradation density signal d2.
Then, the CPU 3 inputs the gradation density signal d2 to the printer 4 as print data d3. As a result, the printer 4 prints out the R-G-B output from a personal computer or the like with black and white gradation.

(Effects of the Invention) As described above, according to the present invention, R-G-B primary color signals from a personal computer, etc. are stored in a video memory as gradation density using a clock synchronized therewith, and this is read out. I decided to print it out, so the above R-G-
The B primary color signal can be printed out accurately and with black and white shading, which is very convenient for the user.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a printer device for a television receiver according to an embodiment of the present invention, and FIG. 2 is an R-G-B
A diagram showing the relationship between color signals and luminance signals, Figure 3 is white-1, O
Diagram showing the luminance ratio of each color when O and white 7.00, 4th
The figure shows the weight of each color when G-22, R-21, and B-20 are used. 1... Video memory, 2... Write control circuit, 3...
・CPU, 4...Printer, 5...Print key.

Claims (1)

[Claims] (1) A printer device that prints out images from a television receiver, which includes a video memory that stores R, G, and B primary color signals to be printed out as gradation density signals, and a printer that prints out images from a television receiver in response to commands from a print key. a write control circuit that controls writing of the gradation density signal to the video memory using a clock synchronized with the R, G, and B primary color signals; A television receiver comprising a central processing unit that outputs a write command and reads out the gradation density signal in the video memory, and a printer that prints out the read out gradation density signal. printer device.