JPH0233229B2 - - Google Patents

Description

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

Generally, when a cooking program is being broadcast on a TV receiver, for example, you may want to write down the menu list and ingredients displayed on the screen, but with a conventional TV receiver, you may not be able to watch it. 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 you record the above cooking program on a VTR,
Although it is possible to reproduce this again, even in that case, it is necessary to search for the necessary screen and play it back statically, which is complicated.

Therefore, the present inventor has already developed 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 RAM and then reading it out. We are developing.

By the way, text broadcasting is recently being planned as a form of television broadcasting, and this will also broadcast text such as weather forecasts and news, and this will be superimposed on a normal image on a cathode ray tube, or just the text will be projected. That is what it is. In such teletext broadcasting, the text information data is transmitted by inserting digital data of the text information into the vertical blanking period of the television signal.
On the other hand, on the receiving side, these character information data are temporarily stored in the memory of the teletext decoder, and the decoder
Converts it into a signal that can be displayed on a CRT and displays it on the screen.

The inventor of the present invention has already developed a device that can make hard copies of the text of such teletext using the above-mentioned printer device, and when it is desired to copy the video or the text of the teletext using such a printer device, each I press the copy key for video and teletext to print out. However, with this device, a problem arises in that if the user presses the copy key for text broadcasting by mistake when wanting to copy the video displayed on the screen, characters that are completely different from the desired video will be printed out.

The present invention has been made in view of the above, and is a printer device that prints out text for video or teletext. When characters are displayed on the screen, press either of the above two copy keys to copy the displayed content, and the screen display is set to a multiplexed video (hereinafter referred to as super mode) that includes the video and teletext characters. ), by making the video or text copy independently using the copy keys for video and teletext, the desired image can be printed out with a simple copy command operation, and it is possible to prevent erroneous operation. It is an object of the present invention to provide a printer device for a television receiver that can eliminate copy mistakes caused by.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. The drawing shows a printer device for a television receiver according to an embodiment of the present invention. In the figure, 1 is a general television receiver circuit. 1a is an antenna, and 1b is a tuner, which is composed of a tuning section, a high frequency amplification section, and a detection section, and outputs a composite video signal. That is, the television signal received by the antenna 1a is selected by the channel selection section 1b, and then amplified by the high frequency amplification section, detected by the detection section, and then the teletext signal is multiplexed into the vertical blanking period. output as a composite video signal. This composite video signal is demodulated by a chroma demodulator 1c in the next stage into a video signal V consisting of a luminance signal and a chroma signal, which passes through a signal switcher 1d and is amplified to a size sufficient to drive a CRT by an amplifier 1e. Ru. and the final stage
Images are displayed using CRT. Here, 1d
is a switch that switches between a video signal from a chroma demodulator and a character signal D that is an output of a teletext decoder 2, which will be described later, and is controlled by a switching signal YS that is also an output of the teletext decoder. That is, when the switching signal YS is at the "L" level, the switch in the signal switching device 1d is set to the 1 side, and a normal video signal is displayed on the CRT. If YS is at the "H" level, the switch is set to the 2 side and the character signal is displayed on the CRT.

On the other hand, 2 is a teletext decoder which receives a composite video signal in which a teletext signal is multiplexed in the vertical retrace period, extracts the teletext signal from this, and controls the teletext signal contained in the extracted teletext signal. Decode the teletext signal according to the code, and decode the teletext signal D
Output. Here, 2a in the figure is a display mode selection button. When pressed once, the switching signal YS, which is one of the outputs of the teletext decoder, is always at the "H" level and the character signal D is selected by the signal switch 1d. The text screen will be displayed on the CRT. Also, if you press this display mode selection button 2a again, the switching signal YS
is always at the "L" level, and normal television broadcasting is selected and displayed on the CRT. That is, the viewer can select whether to watch a normal television broadcast or a teletext broadcast by pressing the button 2d.

By the way, there are roughly two types of display modes in teletext. One is a mode in which only teletext is displayed on the CRT, regardless of the normal television broadcast screen. This is because the signal switch 1d is the signal
This corresponds to always being on the 2nd side according to YS. The other mode is a mode in which text signals are multiplexed (superimposed) and displayed on the screen of normal television broadcasting, such as subtitled text broadcasting. This means that the switching signal YS switches between "H" and "L" at high speed. The teletext decoder 2 always keeps the switching signal YS at "L" level when the display mode selection button 2a is set to the normal television mode, and when the teletext mode is set, the switching signal YS is set to "L" level.
YS is set to the "H" level, but when it is recognized as subtitle text broadcast by the control code included in the teletext signal, the switching signal YS is switched at high speed according to the text signal.

The above is a general configuration of a television receiver for receiving teletext.

Next, the teletext decoder 2 outputs display mode signals a and b in the same manner as the switching signal YS. When the display mode selection button 2a is set to the normal television mode, for example, the display mode signals a and b are each output at the "L" level. On the other hand, when the teletext mode is set using the selection button 2a, the "H" level is output, but as mentioned above, the teletext decoder decodes the control code in the teletext signal and broadcasts subtitled teletext. When this is recognized, the high-speed switching signal YS is output, and the display mode signal a is similarly set to the "H" level and the display mode signal b is set to the "L" level. Alternatively, the reverse may be used, and the display mode signals a and b may both output signals that can be distinguished as "H" or "L".

Although not shown, the teletext decoder 2 always has a built-in microprocessor for decoding teletext signals. A display mode switching button 2a is also connected to this. Display mode signals a and b can be easily outputted from the output port of this microprocessor.

Further, 3 is an A/D converter that converts the above video signal into a gradation density signal Vd, 4 is a copy key that gives a command to print out the video or text for teletext, 4a is for video, and 4b is for teletext. This is the copy key. 5 is a video memory for storing a video gradation density signal Vd or a character signal D; 6 is a video memory for storing a video gradation density signal Vd or a character signal D; 6 is a video memory for printing out either the video or the text of the teletext according to the display mode signal and the commands of the copy keys 4a and 4b; CPU, 7 which generates a print switching signal 20 for selecting a print switching signal 20 and further reads out a gradation density signal Vd or a character signal D in the video memory 5;
is the above A/D according to the above print switching signal 20.
This is a first multiplexer that sends either the gradation density signal Vd from the converter 3 or the character signal D from the teletext decoder 2 to the video memory 5.

Further, 10 is a write address control circuit that provides a write address signal A to the video memory 5,
In this write address control circuit 10, 11
12 is a video clock pulse generator for generating timing for writing the gradation density signal Vd into the video memory 5; 12 is a character clock pulse generator for generating timing for writing the character signal D; 13 is a character clock pulse generator for generating timing for writing the character signal D; The clock pulse generator 11,1
2, a write address counter that supplies the address signal A to the video memory 5 at any timing; 14 is this write address counter 13;
This is a second multiplexer which provides either a video clock pulse or a character clock pulse in response to a command from the changeover switch 4. 8 is above
A printer 9 prints out the signals read out by the CPU 6, and a CRT 9 displays normal video, teletext characters, or both in super mode using a selection switch 2a provided in the teletext decoder. It is.

Next, the operation will be explained.

When the composite video signal is received by the television receiver, the signal is input to the teletext decoder 2 and the television receiver circuit 1, and the teletext decoder 2 receives the character signal D, and the television receiver circuit 1 receives the video signal V. taken out. Then, the video selected by the display mode selection switch 2a, the text of the teletext broadcast, or both are displayed on the CRT 9.

When only the video or only the text of the teletext is displayed on the screen, the display mode signals a and b of the teletext decoder 2 are set to "L" and "L", respectively.
or "H", "H" is output, and the CPU 6 receiving such a display mode signal is
No matter which copy key 4a or 4b for teletext is pressed, a print switching signal 20 corresponding to the display content on the screen is output.

That is, if the current display content on the CRT 9 is only video, the CPU 6 outputs a video print switching signal in response to whichever of the two copy keys 4a, 4b is pressed, and thereby the first multiplexer 7 is switched to select the output from the A/D converter 3, and the second multiplexer 14 is switched to select the video clock pulse. The video signal V from the television receiver circuit 1 is converted into a gradation density signal Vd by the A/D converter 3, and is input to the video memory 5 through the first multiplexer 7. This gradation density signal Vd is written into the video memory 5 at the timing of the pulse by a write address counter 13 that counts video clock pulses. The gradation density signal Vd in the video memory 5 is read out by the CPU 6 and printed out by the printer 8.

Additionally, if the display content of the CRT 9 is only the characters of teletext, the CPU 6 will respond to the above 2.
Regardless of which of the copy keys 4a and 4b is pressed, a teletext print switching signal is output, which causes the first multiplexer 7 to select the output of the teletext decoder 2, and the second multiplexer 14 to select the output of the teletext decoder 2. Each is switched to select the character clock pulse. In this state, the teletext signal D, which is digital data separated by the teletext decoder 2, is directly input to the video memory 5 through the first multiplexer 7. And this teletext signal D is
The data is written into the video memory 5 at the timing of the pulses by the write address counter 13 that counts the character clock pulses. The subsequent reading and printing operations are the same as above.

Next, when the CRT screen is in super mode, the display mode signals a and b of the teletext decoder 2 are "H" and "L", and in this case, the CPU 6
is configured so that when the video copy key 4a is pressed, only the video on the screen is copied, and when the teletext copy key 4b is pressed, only the text of the teletext on the screen is copied. , and outputs a print switching signal 20 to the second multiplexers 7 and 14.

The switching operations, writing, and reading operations at this time are exactly the same as those in the case where only the video or text of the teletext is displayed on the screen described above.

In the device of this embodiment, when the content displayed on the CRT screen is only video or text for teletext, the display content is copied by pressing either the video or teletext copy key. When a viewer wants to print out a CRT screen, there is no need to distinguish between two copy keys, and the viewer can simply press either copy key to print out the desired image.
Also, when the display content is in super mode, you can obtain the desired printout of the video or teletext text by pressing the copy key for video or teletext that you want to output. It's convenient.

As described above, according to the present invention, in a printer device that prints out video or text for teletext, when the display content on the CRT screen is video or text for teletext, the copy key for video or teletext is pressed. Pressing any of these keys will copy the displayed content, and when the displayed content is in super mode, the video and teletext copy keys will each independently copy the video or teletext text. This has the effect that a desired image can be printed out with a simple copy operation.

[Brief explanation of drawings]

The drawing is a block diagram of a printer device for a television receiver according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Television reception circuit, 2... Teletext decoder, 3... A/D converter, 4a, 4b... Copy keys for video and teletext (first and second copy keys), 5... ...Video memory, 6...CPU (switching control means, readout control means), 7... (first)
Multiplexer, 8...Printer, 10...Write address control circuit.

Claims (1)

[Scope of Claims] 1. A printer device for printing out images of a television receiver or text of teletext, which extracts a video signal from a composite video signal and converts the video signal, teletext signal, or a multiplexed video signal of both. The TV receiver circuit displays the image on the picture tube, and the received content is displayed as a video or video image depending on the viewer's button operations.
It is determined whether the teletext is a teletext broadcast, and when the teletext is selected, the teletext signal is extracted from the composite video signal, decoded, and applied to the television receiver circuit, and depending on the decoding result, the received content is either a text-only broadcast or a video. The current received content is the above video,
A teletext decoder that outputs a display mode signal indicating whether it is text or multiple text, and an A/D that converts the video signal into a gradation density signal.
a converter, first and second copy keys for giving a command to print out video or teletext characters, a video memory for storing a video gradation density signal or a teletext signal, and a display mode signal to which the above-mentioned display mode signal is input. When the display content of the picture tube is either video or teletext characters, a print switching signal for the display content is generated when either command of the first or second copy key is input, and the display is displayed. a switching control means for generating a print switching signal for video or teletext in response to a command from the copy key when the content is a multiplexed video; and a gradation density signal from the A/D converter in response to the print switching signal. Alternatively, a multiplexer that sends the teletext signal from the teletext decoder to the video memory, a write address control circuit that provides a write address signal to the video memory, and a read address control circuit that reads the gradation density signal or the teletext signal from the video memory. A printer device for a television receiver, comprising a readout control means and a printer that prints out the readout signal.