JP2546821B2 - Printer device of television receiver - Google Patents

Description

The present invention relates to a printer device of a television receiver.

[Conventional technology]

Generally, in a television receiver, for example, when a cooking program or the like is being broadcast, it may be desirable to write down the menus, ingredients, etc. that are displayed on the screen. Each time the person looks at the screen, he has to write down the menu, materials, etc.,
It was very inconvenient. Further, if the above-mentioned cooking program is recorded on the VTR, it can be reproduced again, but even in that case, the operation of searching for a necessary screen and statically reproducing it is required, which is complicated.

Therefore, the inventor of the present invention outputs the gradation density signal of the image on the TV screen.
We have already developed a printer device for a television receiver that can automatically make a hard copy of the image on the television screen by writing it in RAM and then reading it.

[Problems to be solved by the invention]

By the way, the signals of a personal computer or the like are not composite video signals, but R, G, and B primary color signals at TTL level are connected to a monitor TV to display a clear video on the screen. It would be very convenient for users if they could print this screen as well.

Therefore, an object of the present invention is to provide a printer device of a television receiver capable of printing out R, G, and B primary color signals at the TTL level in the printer device as described above.

[Means for solving problems]

A printer device of a television receiver according to the present invention comprises a luminance signal converting means for converting digital R, G, B primary color signals to be printed out inputted from the outside into an analog gradation density signal, and the analog gradation density. A / D signal
A / D conversion means for converting, video storage means for storing the output signal of the A / D conversion means, and the A / D to the video storage means
Upon receiving a command from the writing control means for controlling the writing of the output signal of the conversion means and the print command means, the writing command is issued to the writing control means and the data stored in the video signal storage means is read out. There is provided a central processing unit for controlling and converting a gradation density signal which is data of the image storage unit into print data, and a printer for printing out the print data.

[Action]

According to the present invention, since the apparatus is configured as described above, the image on the television screen and the R / G /
With the printer device of the television receiver that prints out the B primary color signal, the digital R, G, and B primary color signals output from a personal computer having a different input system can also be printed out, and the CPU that is the central processing unit prints Since it has both the role of converting data and the role of generating a read address for the video memory, it is possible to select the printing process according to the input signal system only by selecting the software process that determines the processing of the CPU. Becomes That is, a device that can print both the screen of the television screen and the screen of a personal computer can be constructed at a low cost. Moreover, it is possible to support various signals in the best mode.

〔Example〕

Here, in explaining an embodiment of the present invention, the basic principle thereof will be described.

FIG. 2 shows the relationship between the R, G, and B primary color signals and the luminance signal (from the TV standard), and FIG. 3 shows the luminance ratio of each color when white = 1.00 and white = 7.00. Fig. 4 shows R ・
An example in which G and B are represented by binary numbers is shown, and G is set to a weight of 2 ² .
The weight of R 2 ¹ shows the brightness values of each color when made to correspond to B 2 ⁰ weight. As is clear from FIGS. 3 and 4, even if R, G, and B are replaced by binary numbers, the approximation can be made.

An embodiment of the present invention will be described below with reference to FIG.
In the figure, 8 is an R / G / personal computer or the like.
B output is based on the above-mentioned basic principle, that is, 2 ^{2 for} G output,
The R output to 2 ^1, B output by adding over each factor of 2 ^0,
It is a luminance signal conversion circuit for converting into a video signal. In addition,
As will be described later, each of the above coefficients can be replaced with another coefficient. Further, 1 is an A / D that A / D converts the video signal v and outputs, for example, a 4-bit gradation density signal d1.
A converter, 2 is a video memory for storing the gradation density signal d1, and 3 is a write control circuit for performing write control to the video memory 2 in response to a write command c2 from a CPU 4 described later,
Reference numeral 4 gives a write command c2 to the write control circuit 3 in response to a print command c1 from the print key 6, and outputs a read address a to the video memory 2 to read data from the memory 2 and read the read data. 2 is print data d3
The CPU 5 that outputs the print data d3 is a printer that prints out the read print data d3. In addition, 7 is the above A / D
Clock pulse generating circuits for supplying the clock pulse p to the converter 1 and the write control circuit 3, s1 and s2 are horizontal and vertical synchronizing signals, respectively.

Next, the operation will be described. The brightness signal conversion circuit 8 is TT
The input signal, which is an R, G, B digital signal of L level, is converted into a video signal v based on the above-mentioned operation, and this is output. The A / D converter 1 samples the video signal v using the clock pulse p of the clock pulse generation circuit 7,
The gradation density signal d1 is output. The writing control circuit 3 writes the gradation density signal d1 in the video memory 2 at the timing of the clock pulse p according to the writing command c2. The writing control circuit 3 uses the horizontal and vertical synchronizing signals s1 and s2 to perform control so as to write the gradation density signals of, for example, 280 pixels in the horizontal direction and 234 lines in the vertical direction to the correct address of the video memory 2. The write command c2 of the write control circuit 3 is sent to the CPU 4 when the user operates the print key 6.
Is emitted from.

When the writing to the video memory 2 is completed, the CPU 4 gives the read address a to the video memory 2 and reads the gradation density signal d2. Then, the CPU 4 inputs the tone density signal d2 to the printer 5 as print data d3, whereby the printer 5 prints out the R, G, B outputs of a personal computer or the like.

In this embodiment, since the R, G, B outputs of a personal computer or the like can be printed out with gradation using a monochrome printer, the user can easily make a hard copy of the screen, which is very convenient. Is.

Further, in this embodiment, since the R, G, B outputs are once converted into analog signals, if the coefficients applied to the respective R, G, B outputs are adjusted at that time, the results shown in FIG. 2 are obtained. The brightness (density) of each gradation that is printed out can be adjusted freely, not the brightness ratio.
Can be freely changed. Similarly, R ・ G
Since the B digital signal is once converted to an analog signal, it is possible to prevent the loss of character information and the like during the subsequent A / D conversion. That is, when white characters are displayed on the screen on a black background due to character information or the like, once converted into an analog signal, the signal waveform is blunted.
Not only black areas but also intermediate color areas are generated. This causes a slight lack of sharpness on the screen, but the intermediate color portion is also sampled as having information, and therefore information is not completely lost.

〔The invention's effect〕

As described above, according to the printer device of the television receiver of the present invention, the luminance signal converting means for converting the digital R, G, B primary color signals to be printed out inputted from the outside into the analog gradation density signals. An A / D conversion means for A / D converting the analog gradation density signal, a video storage means for storing an output signal of the A / D conversion means, and the A / D conversion means for the video storage means. In response to a command from the write control means for controlling the write control of the output signal of and the print command means, the write command is issued to the write control means and the reading of the data stored in the video storage means is controlled. And a central processing unit for converting the gradation density signal, which is the data in the image storage unit, into print data, and a printer for printing out the print data. Therefore, in the printer device of the television receiver which prints out the image on the television screen and the R, G, and B primary color signals at the TTL level, the digital signal output from a personal computer or the like having a different system for the input signal.・ G / B primary color signals can also be printed out. Moreover, it is possible to meet each condition only by selecting software processing according to the type of input signal or printing specifications, and a dedicated hardware circuit and a configuration for selecting it according to the specifications are not required. In other words, there is an effect that the apparatus can be constructed at low cost even though a plurality of signals can be used for printing out.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a printer device of a television receiver according to an embodiment of the present invention, FIG. 2 is a diagram showing a relationship between R, G, and B color signals and a luminance signal, and FIG. 3 is white = 1.00. And the figure showing the luminance ratio of each color when white = 7.00, Fig. 4 shows G =
It is a diagram illustrating a ^{2 2, R = 21, B} = 2 0 each color value of when the. 1 ... A / D converter, 2 ... video memory, 3 ... writing control circuit, 4 ... CPU, 5 ... printer, 6 ... print key, 8 ... luminance signal conversion circuit.

 ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-58-51684 (JP, A) JP-A-58-175390 (JP, A) JP-A-57-104935 (JP, A)

Claims (1)

(57) [Claims] 1. A printer device for printing out an image of a television receiver, wherein a digital R to be printed out is inputted from the outside.
A luminance signal converting means for converting the G and B primary color signals into an analog gradation density signal; an A / D converting means for A / D converting the analog gradation density signal; and an output signal of the A / D converting means. A video storage means for storing, a write control means for controlling writing of the output signal of the A / D conversion means to the video storage means, and a write command for the write control means in response to a command from the print command means. The central processing unit for controlling the reading of the data stored in the video storing means and converting the gradation density signal, which is the data in the video storing means, into print data. A printer device for a television receiver, comprising a printer for printing out data.