JPH0970025A - Television receiver - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To prevent interruption of character multiplex broadcast processing due to multi-screen search. A tuner 13, a main screen image reproduction circuit 16,
It has a main screen compression circuit 17, a tuner 14, a sub-screen video reproduction circuit 23, and a sub-screen compression circuit 24.
In response to the switching of the receiving channels one after another, the sub-screen video reproduction circuit 23 and the sub-screen compression circuit 24 are made to interoperate to obtain a multi-screen composed of reduced screens of a plurality of channels. The selector 15 is a tuner 13 and a tuner 14.
One of the output signals is selected and supplied to the teletext decoding circuit 18. When the multi-screen generation circuit is set to the operating state, the control circuit 30 causes the tuner 13 to receive the program of the character multiplex broadcast of the channel received by the tuner 14, and the selector 13 selects the program of the relevant program in the character broadcast decoding circuit 18. Continue the decoding process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver capable of arbitrarily displaying a combination of a plurality of television programs and a character multiplex program.

[0002]

2. Description of the Related Art There is a television receiver incorporating a character multiplex signal decoder capable of receiving a character multiplex program. In the conventional television receiver of this type, one tuner is used both for receiving a television broadcast and for receiving a character multiplex broadcast.
For this reason, it is possible to process only the character multiplex signal multiplexed in the television signal of the channel being received, and it is not possible to decode the character multiplex signal of the other channel. Therefore, the channel being received (main program)
If you switch to, the character multiplex program will also switch.

By the way, there is a television receiver having two tuners built-in and capable of displaying a plurality of screens. In this receiver, a method of using one tuner as a receiver exclusively for a character multiplex program has been proposed. . In this system, it is possible to handle television broadcast reception and character multiplex broadcast reception independently. While it is possible to select and display a main program on one side, it is possible to freely select and display a character multiplex broadcast program (character program) on another channel on the other side.

[0004]

In the case of the television receiver having the two tuners described above, it is conceivable that a multi-screen search function is further added. The multi-screen search function switches the reception channels one after another, compresses one screen of the received channels horizontally and vertically, and simultaneously displays a reduced screen of each channel on the screen.

The multi-screen search function includes a second tuner and a second tuner.
Is assumed to be executed in the video reproduction circuit.
Now, suppose that a normal television program is being watched in the first tuner and the first video reproduction circuit, and the second tuner side is receiving the character multiplex broadcast. In the display state, for example, the left half displays a normal TV program and the right half displays a character multiplex program. Here, it is necessary to search for a program, and the multi-screen search function is activated. Then, reduced screens for each channel are displayed one after another on the right half. However, on the other hand, the teletext information that has been accumulated up to now becomes halfway information. This is because the second tuner is switched to each channel one after another, information of different character multiplex broadcasting is taken in, and the information is taken in with insufficient time taken. If the program is found and the multi-screen search function is stopped, and the original display state is restored, that is, the left half returns to the normal TV program and the right half returns to the text multiplex program display status, the information on the text broadcasting is incomplete. , There is a situation where it is temporarily not displayed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a television receiver capable of preventing information of character multiplex broadcasting from being interrupted halfway due to a multi-screen search. Still another object of the present invention is to provide a television receiver capable of reducing mutual interference that distributes a high frequency signal to two tuners.

[0007]

DISCLOSURE OF THE INVENTION According to the present invention, a distributing means for distributing a high frequency television signal to first and second distribution output terminals, and a first tuner connected to the first distribution output terminal, A second tuner connected to the second distribution output terminal, a main screen image reproduction circuit that is supplied with the output signal of the first tuner and reproduces an image, and an output image signal of the first image reproduction circuit , A sub-screen video reproduction circuit that performs video reproduction by being supplied with the output signal of the second tuner, and a sub-screen compression circuit that compresses the output video signal of the sub-screen video reproduction circuit. In response to the second tuner switching the reception channel one after another, the sub-screen video reproduction circuit and the sub-screen compression circuit are operated in mutual operation to provide a multi-screen having a reduced screen of a plurality of channels. A multi-screen generation circuit for generating the main screen, a main screen from the main screen compression circuit, and a screen multiplex circuit for time-multiplexing to distribute the sub-screen or the multi-screen from the sub-screen compression circuit onto the screen, Display means for displaying a video signal from the screen video reproducing circuit or the screen multiplexing circuit, selecting means for selecting one of the output signals of the first tuner and the second tuner, and the selecting means. A teletext decoding means for decoding a teletext broadcast program from an output signal, a text multiplexing means for multiplexing the signal output from the teletext decoding means with a video signal to be given to the display means, and the multiscreen generation circuit are operated. When the status is set, the selection unit is controlled to allow the first tuner to receive the character multiplex broadcasting program of the channel which was received by the second tuner. And to so that,
And a control means for continuing the decoding processing of the program by the teletext decoding means.

According to the above means, the character multiplex program is not interrupted even if the channel search is performed by the multi-screen display while the character multiplex program is being watched and then the previous display state is restored.

Further, according to the present invention, the channel of the television program and the channel of the character multiplex program are the same channel while the television program is displayed on the main screen of the display means and the character multiplex program is displayed on the sub screen. In this case, the selecting means has a means for controlling so as to select the output signal of the first tuner. This prevents interference between the outputs of the distributor. Further, in this state, it has a control means for stopping the power supply of the second tuner, thereby reducing the power consumption.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention, in which an antenna 11 is connected to a distributor 12. The distributor 12 has first and second distribution output terminals. The first distribution output terminal is connected to the first tuner 13, and the second distribution output terminal is connected to the second tuner 14. The output terminal of the first tuner 13 is the selector 1
5 is connected to one input terminal of the video reproduction circuit 16 and is connected to the input terminal of the video reproduction circuit 16. The video signal reproduced by the video reproduction circuit 16 is supplied to the main screen compression circuit 17. The R, G, B converted RGB signals in the video reproduction circuit 16 are supplied to the RGB switch circuit 20. The output of the RGB switch circuit 20 is supplied to the CRT drive circuit 21, which drives the CRT 22 and serves as an image display output.

On the other hand, the output terminal of the second tuner 14 is
It is connected to the other input terminal of the selector 15 and also connected to the input terminal of the sub-screen video reproducing circuit 23. The video signal reproduced by the sub-screen video reproduction circuit 23 is supplied to the sub-screen compression circuit 24. The output video signal of the sub-screen compression circuit 24 and the output video signal of the main screen compression circuit 17 are supplied to the screen multiplexing circuit 25. The output video signal of the screen multiplexing circuit 25 is R, G, B converted by the video reproduction circuit 16 and supplied to the RGB switch circuit 20 as an RGB signal.

Further, the selected output of the selector 15 is supplied to the teletext decoding circuit 18. The teletext decoding circuit 18 decodes the information of the teletext program multiplexed in the vertical blanking period of the television signal,
The text program storage memory 19 is successively stored and updated. The RGB signal output from the teletext decoding circuit 18 is RG.
The signal is supplied to the B switch circuit 20, selected by the switch circuit 20 by the control signal YS indicating the timing of displaying the text program, and output.

Reference numeral 30 is a system control circuit. The system control circuit 30 can control the channel selection of the tuners 13 and 14 in response to an operation signal from a remote controller (not shown). In addition, the selection state of the selector 15 can be determined according to a preset program. Furthermore, in the multi-sided channel search mode, in response to the tuner 14 switching the reception channels one after another, the sub-screen video reproduction circuit 23 responds.
It is possible to construct a multi-screen generation circuit that interoperates with the sub-screen compression circuit 24 to generate a multi-screen having reduced screens of a plurality of channels. Furthermore, the switch 31
When the tuner 14 is not used, power supply from the power supply circuit 32 can be stopped to reduce power consumption.

FIG. 2 is a flow chart shown for explaining the operation of the television receiver of the present invention. For example, it is assumed that the remote controller is operated to instruct the system control circuit 30 to display another television signal simultaneously with the main screen on the sub screen (step S11). At this time, the control signal YS is maintained at the low level. Therefore, the teletext signal is not accepted by the switch 20.

The second tuner 14 selects the channel designated by the user (step S12), and the video signal from the screen multiplexing circuit 25 is displayed (see the display state in FIG. 3A). At this time, the selector 15 is switched to select the output signal of the first tuner 13 (step S13).

Next, when the multi-screen search mode is designated (step S13), the channel selection of the second tuner 14 is frequently switched (step S14), and the screen display is performed ((b) of FIG. 3). Refer to the display state). Also at this time, the selector 15 is switched so as to select the output signal of the first tuner 13 (step S13).

Next, when the character mode is designated (step S14), the control signal YS becomes high level (step S16). Then, the second tuner 14 is caused to select the channel broadcasting the character multiplex program (step S17). Next, it is determined whether the channel selected by the second tuner 14 and the channel selected by the first tuner 13 are the same (step S18). When the selected channels are different from each other, the selector 15 selects the output signal of the second tuner 14, and the character multiplex broadcast signal is decoded. Switch circuit 20
Selects and displays a video signal on the main screen side and a character multiplex program signal from the teletext decoding circuit 18. The display state at this time is as shown in FIG.

If the channels selected by the tuners 13 and 14 are the same in step S18, the selector 15 is controlled to select the output signal of the first tuner 13 (step S19), and the tuner 14 is switched. 31 is controlled and the power is turned off.

In this system, the following usages are possible, for example. It is assumed that the tuner 14 receives the character multiplex broadcast to watch the character multiplex program, and the tuner 13 watches the television program. The display state at this time is as shown in FIG. Here, it is assumed that it is necessary to search for a channel by using the multi-screen search function. At this time, the tuner 14 is frequently switched for multi-screen search (display state of FIG. 3B). Because of this, the processing of the character multiplex program will be interrupted,
In this system, it is possible to switch the selector 15 to the tuner 13 side and receive the character multiplex broadcast that has been received so far on the first tuner side and continuously process it. Then, the purpose of the multi-screen search is achieved, and the original display state (state of (c) of FIG. 3) is restored, and the tuner 13 becomes the previous program reception state, and the tuner 14 becomes the previous character multiplex broadcast reception state. In this case, the latest information will be displayed as the character multiplex program. That is, the processing of the character multiplex program continued even during the multi-screen search.

[0020]

According to the television receiver of the present invention, it is possible to prevent interruption of the information of the character multiplex broadcasting due to the multi-screen search.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a flow chart shown to explain the operation of the circuit of FIG.

FIG. 3 is an explanatory diagram showing a display example of the television receiver of the present invention.

[Explanation of symbols]

12 ... Distributor, 13, 14 ... Tuner, 15 ... Selector,
16 ... Video reproduction circuit, 17 ... Main screen compression circuit, 18 ... Text broadcasting decoder, 19 ... Text program storage memory, 20 ... R
GB switch circuit, 21 ... CRT drive circuit, 22 ...
CRT, 23 ... Sub-screen video reproducing circuit, 24 ... Sub-screen compression circuit, 30 ... System control circuit, 31 ... Switch, 3
2 ... Power supply circuit.

Claims (3)

[Claims] 1. A distribution means for distributing a high frequency television signal to first and second distribution output terminals, and a first tuner connected to the first distribution output terminal.
A second tuner connected to the second distribution output terminal, a main screen image reproduction circuit which is supplied with an output signal of the first tuner and reproduces an image, and an output video signal of the first image reproduction circuit , A sub-screen video reproduction circuit that performs video reproduction by being supplied with the output signal of the second tuner, and a sub-screen compression circuit that compresses the output video signal of the sub-screen video reproduction circuit And in response to the second tuner switching the receiving channels one after another, the sub-screen video reproducing circuit and the sub-screen compressing circuit are made to interoperate to form a multi-screen having a reduced screen of a plurality of channels. A multi-screen generation circuit for generating, a screen multiplex for time-multiplexing to distribute the main screen from the main screen compression circuit and the sub-screen or multi-screen from the sub-screen compression circuit on the screen. Display means for displaying a video signal from the main screen video reproduction circuit or the screen multiplexing circuit, and selection means for selecting an output signal of either the first tuner or the second tuner, A teletext decoding means for decoding a teletext program from an output signal of the selection means, a text multiplexing means for multiplexing the signal output from the teletext decoding means with a video signal to be given to the display means, and the multi-screen When the generation circuit is set to the operating state, the selection unit is controlled to enable the first tuner to receive the character multiplex broadcasting program of the channel received by the second tuner, and the character A television receiver comprising: a control unit for continuing the decoding process of the program by the broadcast decoding unit. 2. The control means displays the television program on the main screen of the display means and displays the character multiplex program on the sub screen, and the channel of the television program is the same as the channel of the character multiplex program. In the case of a channel, the television receiver according to claim 1, wherein the selecting means includes means for controlling to select the output signal of the first tuner. 3. The television receiver according to claim 1, wherein the control means further includes control means for stopping power supply to the tuner not selected by the selection means.