JPS61270980A - Printer device for television receiver - Google Patents

Abstract

PURPOSE:To improve a vertical resolution and obtain a clear print picture by dividing a gradation density signal of one frame every field to store in an image memory and printing out it. CONSTITUTION:An input video signal v is converted into a digital signal by an A/D converter 1 and a gradation density signal d1 is outputted to a shift register 2. The shift register 2 outputs the gradation density signal of 5 bits every 5 bits and supplies to a video memory 3. The accumulation of the data in the video memory 3 is controlled by a writing control circuit 4 and a field discriminating circuit 5 outputs a signal (f) for discriminating the field in which the data is written. In the video memory 3, the information of one frame divided every field is accumulated. When this writing is completed, a CPU6 gives a reading address (a) to the memory 3 and outputs a gradation densoty signal d3 to a printer 7 as the printing data d4.

Description

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

[Conventional technology]

Generally speaking, when a cooking program is being broadcast on a television receiver, for example, you may want to write down the menu list, ingredients, etc. that are 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. Also, if the cooking program mentioned above is stored in VTFt, 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 complicated. there were.

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]

However, in the conventional method, one field memory is used to store one field of video signal 8, and this is printed out. The drawback was that the resolution was poor.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology, and its purpose is to provide a printer device for a television receiver that can improve the vertical resolution and produce clear printed images. There is.

[Means for solving problems]

A printer device for a television receiver according to the present invention,
The gradation density signal 8 for one frame is divided into fields and stored in a video memory, and then printed out.

[Effect]

According to the present invention, since one frame's worth of gradation density signals 8 are stored and printed out, a printed image equal to the vertical resolution of the video signal can be obtained.

〔Example〕

First, in explaining the present invention in detail, the present invention will be explained in detail.

As the amount of information in one field, the number of pixels in one scanning line is 64.
If 0 pixel and the number of scanning lines are 234 trees, the amount of information in the above l field is 640 x 234-149760
Therefore, one frame requires twice the amount of information above, which is 299+
It becomes 520 bits. Also, the number of pixels in one scanning line is 64.
0 pixels means effective scanning time (8%) is 52.77
8, so the sampling rate is 52. F, l(S/
640 to 180n8e (!), and it is impossible to write these as they are in a low-cost memory (in terms of speed). In such a case, the writing method is to write data for multiple pixels into a shift register. There is a method of storing them and writing them to the video memory at the same time.According to this method,
The sampling speed is reduced by the number of pixels, and low-cost memory can be used.

Therefore, as an embodiment of the present invention, by setting the plurality of pixels to 5 bits, the speed/bringing speed is 80 nae.
c x 5-400 nsec, the address size is 299,520 x 115 or 59,904 addresses, and low-cost 64-bit D-RAM (5 pieces) can be used. And this 64 bit D@R
Sixteen pieces of AM address information are required, and therefore, in this embodiment, the most significant bit t of these 16 trees of address information is used to divide the memory into odd field memory and even field memory. Note that when one pixel is a 16-level gradation density signal, the memory is 64K.
It will be composed of X5 pieces x 4 pieces.

Figure 2 is a memory map of the video memory, with address ooo
The area from o to '77FF (in hexadecimal) is used as an odd field memory area, and the area up to 8000-IPF'FT (in hexadecimal) is used as an even field memory area.

Next, a block diagram of a printer device for a television receiver according to an embodiment of the present invention is shown in a 4X1 diagram.

In the figure, a converter for A/D converting a 1/ri video signal Vt and outputting a gradation density signal d1, a shift register for storing 2 to 5 bits worth of pixels, and a 3 digit gradation density signal for storing 5 bits worth of pixels. A video memory that stores d2, 4Iri c, which will be described later.
A write control circuit performs write control to the video memory 3 in response to a write command C2 from ptr a, identifies 5#: as an odd field or an even field, and sets the identification value f to the address information maximum of the video memory 3. This is a field identification circuit that connects to the upper bit and switches the memory area.

In response to the print command C1 from the 6-digit print key 8, a write command C2 is given to the write control circuit number, and the read address at- is output to the video memory 3 to convert the read data d3 from the video memory 3 into print data. This is the CPU that outputs as d4. Here, the most significant hit of read address a becomes field switching information. 7ij A printer that prints out the read print data d4,
9 pieces above A/B converter 1. Write control circuit 4゜Clock pulse generation circuit that supplies clock pulse P to field identification circuit 5I and shift register 2,! 91. E.I.
These are horizontal and vertical synchronization signals for each of the two machines.

Next, the operation will be explained.

A/'D converter 1r/'! The clock pulse generation circuit 9 samples the video signal V using the lock pulse P and outputs a 1-gradation density signal %, :u. shift register Z
The gradation density signal for 5 bits is stored using the fl upper E clock pulse 9, and is output every 5 bits as storage 7: #I'' + d2.The write control circuit 4 uses the write command C2 to The gradation density signal d2 is written to the video memory 3 at the timing of the above clock pulse P. This write control circuit 4 receives horizontal and vertical synchronization signals 81.82'
Control is performed so that address information for 128 degrees in the horizontal direction and 234 lines in the vertical direction is correctly written into the video memory 3 by using the address information. Note that although the horizontal address is set to 128 here, 640 pixels are written in 5 bits at a time, so the address becomes 640÷5-128.

Five field identification circuits identify fields using horizontal and vertical synchronizing signals S1 and S2, and output an identification value f as a result. This identification value f is connected to the most significant bit of the write address of the video memory 3, and by kneading, the gradation density signal is written separately into an odd field area and an even field area as shown in Figure 2. .

When the CPU receives the command C1t from the 6-digit print key 8, it issues a time write command C2 for 2 vertical synchronization periods to the write control circuit 4 in synchronization with the vertical synchronization signal S2. Gradation density signals 8 for frames are stored. When writing to the video memory 3 is completed, C! The PU ag continuous output address a is given to the video memory 3, the gradation density signal d3 is inputted to the printer as print data d4, and the printer 7 prints out one frame of video signal Ji+ by kneading. At this time, the most significant bit of read address a? It is used to switch between odd and even field areas.

With this type of wood-weaving device, one frame of video [1!
Since a memory circuit capable of storing 5j is used, the resolution is improved compared to a conventional printer device using one field memory, and clearer printed images can be obtained. Furthermore, since the device is constructed using a 64-bit D-RAM as one frame memory, the device can be made inexpensive.

[Effects of the Invention] As described above, according to the present invention, a printer device that prints out video from a television receiver uses a frame memory as its video memory, and prints a video of a frame! Since the signal Ji+ is printed out, it is possible to obtain a clear printed image equal to the vertical resolution of the video signal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a printer device for a television receiver according to one example of the present invention, and FIG. 2 is a diagram showing a memory map in the device. 3... Video memory, 4... Write control circuit, 5...
-Field identification circuit, 6...cpn, +7...printer, 8...print key.

Claims (1)

[Claims] (1) A printer device for a television receiver that prints out images from the television receiver, which includes a video memory having a capacity to store tone density signals for one frame, and a printer that prints out images from the 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, and a field to which the gradation density signal belongs so that the gradation density signal for one frame is divided into fields and written to the video memory; a field identification circuit for identifying the gradation density signal; a central processing unit configured to output a write command to the write control circuit in response to a command from the print key and read out a gradation density signal in the video memory; What is claimed is: 1. A printer for a television receiver, comprising: a printer that prints out a gradation density signal.