JPH10285489A - Television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a television receiver to confirm a competing program on a different channel on a slave pattern, through the use of a CM broadcast time zone of a major viewing channel by compositing a video signal of a main program and a video signal of a sub-program and displaying the result on the screen for a CM broadcast period. SOLUTION: A broadcast of a designated channel is selectively received as a main program with a main program receiver 2 and displayed on a screen of a display device 5 via a composite circuit 4. When the main program indicates a CM broadcast program, a multiplex control signal extracted by a signal processing circuit 2s is demodulated by a control circuit 6, and a prescribed frequency which denotes a stereo audio multiplexing broadcast is detected. A receiver 3 for a competing program on a different channel selects and receives the competing program of a designated specific channel and gives a video signal of the competing program to the composite circuit 4. The composite circuit 4, receiving a synthesis command from the control circuit 6 inserts a video signal of a slave image pattern on a slave pattern display position in a master image pattern and composites it and gives the video signal which is the composited main and competing programs for the display device 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver in which a back program can be visually recognized on a small screen by using a CM broadcasting time zone of a main program being viewed.

[0002]

2. Description of the Related Art Some television receivers having a large screen size have a two-screen display function of displaying broadcast images of two different broadcast channels by dividing the same screen into two parts. The display screen is divided into two so that the main program and the counterprogram can be displayed in parallel so that the counterprogram can be checked.

[0003]

The above-mentioned conventional television receiver can display the main program and the counterprogram on two screens, or vice versa. It is necessary to issue a required remote command from a remote control transmitter or the like. For this reason, for example, if you want to check the back program only when the main program is on CM broadcasting,
The remote control transmitter must be operated when the main program enters the CM broadcast, and the remote control transmitter must be operated again before the CM broadcast ends, which poses a problem that the remote control operation is very troublesome. .

An object of the present invention is to solve the above-mentioned problem, and an object of the present invention is to make it possible to confirm a back program on a small screen by using a CM broadcast time zone of a main program being viewed.

[0005]

In order to achieve the above object, a program receiving means for selecting and receiving a main program and a counter program and outputting a video signal of each program, and wherein the main program is in CM broadcast Operating by the output of the CM detecting means, and synthesizing the video signal of the main program and the video signal of the sub-program during the CM broadcasting period, and the main signal during the other periods. It is characterized by comprising a synthesizing circuit for outputting only a video signal of a program, and a display device for displaying an output of the synthesizing circuit on a screen.

When the CM detecting means determines that the CM multiplex broadcast is being performed when the multiplex control signal of the audio multiplex broadcast indicates that the broadcast is a stereo broadcast, the synthesizing circuit converts the video signal of the main program into a broadcast. A signal obtained by performing a blanking process on a video signal of the main program in a sub-screen display area set as a part of the main screen as a main screen and thinning out the scanning lines of the video signal of the counter program to the sub-screen. It is characterized by generating a video signal in which a child screen is combined with a part of a parent screen by fitting it into a display area.

[0007] Further, the program receiving means selects and receives a specific broadcast channel specified in advance during the CM broadcast period, or broadcasts a plurality of broadcast channels specified in advance during the CM broadcast period for a predetermined time. It is characterized by intermittently selecting and receiving a channel sequentially at intervals, or intermittently selecting and receiving all broadcast channels receivable during the CM broadcast period at predetermined time intervals. .

The program receiving means has a main program receiver for selecting and receiving a main program and outputting a video signal, and a counter program receiver for selecting and receiving a counter program and outputting a video signal. Alternatively, the program receiving means tunes and receives the main program and the counter program in a time-division manner, outputs the video signal of the main program by scanning line interpolation, and outputs the video signal of the counter program by thinning out the scanning lines. And the like.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a schematic circuit diagram showing an embodiment of a television receiver according to the present invention.
FIG. 3 shows a frequency spectrum distribution of an audio multiplex signal, FIG. 3 shows an example of a display screen of the display device shown in FIG. 1, and FIG. 4 shows channel selection when a multi-channel reception mode is set for a counter program. FIG. 5 is a flowchart for explaining the reception operation, and FIG. 5 is a flowchart for explaining the channel selection reception operation when the all-channel reception mode is set for the counter program.

A television receiver 1 shown in FIG. 1 has a main program receiver 2 for receiving a main program to be viewed and a back program for receiving a back program displayed as a child screen of a parent-child screen during a CM broadcast period. A program receiver 3, a synthesizing circuit 4 for synthesizing the reception outputs of both receivers 2 and 3 into a parent and child screen and displaying the two screens, a display device 5 for displaying the output of the synthesizing circuit 4 on the screen, and receiving as a CM detecting means And a control circuit 6 for controlling the synthesizing circuit 4 and the like. As the display device 5, a cathode ray tube (CRT), a liquid crystal display panel, a plasma display, or the like is used.

The main program receiver 2 and the counter program receiver 3 have tuners 2t and 3t commonly connected to a receiving antenna 7, and an IF circuit 2i for amplifying the tuning output of the tuners 2t and 3t to an intermediate frequency. , 3i, and signal processing circuits 2s, 3s for performing signal processing on the intermediate frequency amplified outputs of the IF circuits 2i, 3i to demodulate and reproduce video signals, are cascaded to the tuners 2t, 3t. The synthesizing circuit 4 is a PIP that displays the video of the main program on the main screen and the video of the counterprogram on the sub-screen.
(Picture In Picture) circuit. In the synthesis of the parent and child screens, here, a blanking process is performed on the image at the child screen display position of the parent screen, and the scanning lines are thinned at the blanked child screen display position in accordance with the image compression ratio. This is done by fitting the image of the small screen.

The control circuit 6 demodulates the multiplex control signal extracted from the audio signal by the signal processing circuit 2s of the main program receiver 2 to detect whether or not the main program is broadcasting a CM. In some cases, the counter-program receiver 3 and the synthesizing circuit 4 are operated to display the counter-program on the child screen. That is, CM
Since most of the broadcasts are stereo broadcasts, the main program is determined to be in CM broadcast. Audio multiplex broadcasting has a frequency spectrum distribution shown in FIG. 2, and in the case of stereo audio multiplex broadcasting, a pilot signal obtained by amplitude-modulating a carrier wave of 982.5 Hz and 55.125 kHz is audio multiplexed as a multiplex control signal. The signal is transmitted by being superimposed on the signal. Therefore, by detecting this multiplex control signal, stereo audio multiplex broadcasting is realized, that is, C
It detects that M broadcast is being received. In the case of bilingual broadcasting, a carrier wave of 55.125 kHz is used for 922.5H.
Since the amplitude is modulated by z, it can be received separately from stereo audio multiplex broadcasting. However, here, since the configuration is such that the audio multiplex broadcast is recognized as a CM broadcast only when the audio multiplex broadcast is a stereo broadcast, the audio multiplex broadcast is a broadcast other than the stereo broadcast, for example, a bilingual broadcast, or a dual audio signal. If the broadcast is a monaural broadcast, it is not recognized that a commercial is being broadcast, and the child screen display of the back program is not performed.

In the present embodiment, the tuner 3t in the counter program receiver 3 receives a command from the control circuit 6 to select and receive a counter program. It can be selected from the station reception mode. The three types of channel selection reception modes are a specific channel reception mode in which only a specific broadcast channel specified in advance is selected and received, and a plurality of broadcast channels specified in advance are intermittently selected in predetermined time intervals. There are three types of modes: a multi-channel reception mode for receiving, and an all-channel reception mode for intermittently selecting and receiving all receivable broadcast channels at predetermined time intervals in sequence, using a remote control transmitter (not shown). Any one of the tuning reception modes can be remotely set. More specifically, the timer 6a is activated when it is determined that a commercial has started, and issues a channel switching instruction at intervals of several seconds. The counter 6b counts the channel switching instruction issued by the timer 6a. A memory 6c in which a broadcast channel, a plurality of broadcast channels specified in advance, and all channels receivable at the reception location are stored is connected, and channel selection reception of a counter program is performed according to a channel selection reception mode. It has become.

Here, when the power of the television receiver 1 is turned on while the specific channel receiving mode is selected,
A broadcast of a channel specified by a remote control transmitter or the like is selected and received as a main program by the main program receiver 2,
The screen is displayed on the display device 5 via the synthesis circuit 4. In this case, since the synthesizing circuit 4 is in a through state during the non-CM period, the output of the signal processing circuit 2s in the main program receiver 2 is directly supplied to the display device 5 via the synthesizing circuit 4 to display the main program. Is performed. However, when the main program enters the CM broadcast, the multiplex control signal extracted in the signal processing circuit 2s is demodulated by the control circuit 6, and a frequency of 982.5 Hz indicating stereo audio multiplex broadcast is detected. As a result, at the same time as the detection of the frequency, the control circuit 6 issues a channel selection command and a synthesis command to the counter-program receiver 3 and the synthesis circuit 4, respectively. In this case, since the specific channel reception mode is selected, the channel selection command issued by the control circuit 6 is only the specific channel stored in the memory 6c.

When the tuner 3t receives a channel selection command from the control circuit 6, the tuner 3t selects and receives the counter program on the specified channel, and the IF circuit 3i and the signal processing circuit 3s.
The video signal of the counter program is supplied to the synthesizing circuit 4 via the. Further, the synthesizing circuit 4 having received the synthesizing command from the control circuit 6 performs a blanking process on the video signal at the sub-screen display position of the parent screen, and scans the scanning line at this sub-screen display position in accordance with the image compression ratio. The video signal of the culled child screen is inserted and synthesized, and the video signal in which the main program and the counterprogram are synthesized is supplied to the display device 5. As a result, the main program is displayed on the display device 5 as C
During the period during which the M broadcast is being performed, as shown in FIG. 3, a composite video in which the counterprogram is inserted as a child screen in a part of the main program is displayed. In this case, since the back-program receiver 3 selects and receives only a specific broadcast channel specified in advance, during the CM broadcast period, the receiver narrows down to a specific broadcast channel other than the main program and is most interested in it. The contents can be visually recognized, and it is possible to provide information for determining the necessity of channel switching. The display of the synthesized video by the synthesizing circuit 4 is limited only during the period when the main program is broadcasting the CM, and when the CM broadcasting ends, the multiplex control signal supplied from the signal processing circuit 2s to the control circuit 6 is transmitted. To stop the operation, the counter-program receiver 3 stops operating, and the synthesizing circuit 4 also stops substantial synthesizing.

When the control circuit 6 is set not to the specific channel reception mode but to the multi-channel reception mode for intermittently selecting and receiving a plurality of broadcast channels specified in advance at predetermined time intervals, FIG. As shown in FIG. 4, at the determination step (101), when it is determined that a commercial has started, the timer 6a is activated, and a channel switching command is issued at intervals of, for example, 5 to 10 seconds. As described above, the control circuit 6 is connected to the counter 6b for counting the channel switching command and the memory 6c for storing a plurality of broadcast channels specified in advance. The broadcast channel is read. That is, at the same time as the start of the CM broadcast, as shown in step (102), the timer 6a is operated, and at the same time, the broadcast channel stored at the address 0 of the memory 6c is read out, and this broadcast channel is used for receiving the counter program. The tuner 3t of the unit 3 is given a tuning command. Next, when the first switching command is issued from the timer 6a, the count value of the counter 6b is incremented by "1" in the subsequent step (104) according to the result of the determination in the determination step (103). Here, the number N of broadcast channels already stored in the memory 6c is known,
In the next determination step (105), it is determined whether or not the reception of all broadcast channels specified in advance has been completed. If the channel selection reception of the designated broadcast channel has not been completed, in step (106), the memory 6
The broadcast channel is read from the nth address of c, and the process returns to step (103) again. If it is determined that the tuning reception of the designated broadcast channel has been completed, the process proceeds to step (1).
At 07), the count value of the counter 6b is cleared, and at the same time, a broadcast channel is read from the address 0 of the memory 6c, and the process returns to step (103). Therefore, such a cyclic tuning operation is repeatedly performed during the CM broadcast period.

As described above, the counter-program receiver 3 intermittently selects and receives a plurality of broadcast channels designated in advance at predetermined time intervals during the CM broadcast period, so that the receiver is most interested. As long as a plurality of broadcast channels are designated in advance, the designated broadcast channels can always be visually recognized in order from the two-screen display during the CM broadcast, and it is possible to provide a wide range of information on the necessity of switching channels. . Note that the memory 6c can store broadcast channels in ascending order of channel number, but can also store broadcast channels in descending order of desired viewing priority. In such a case, spots can be stored for a short period of about 30 seconds. Even during the commercial broadcast period, at least 3 to 6 channels can be displayed for broadcast channels of interest to the user in the counter program.

On the other hand, when the control circuit 6 is set to the all-channel reception mode in which all receivable broadcast channels are intermittently selected and received at predetermined time intervals, as shown in FIG. In the determination step (201), the timer 6a
Is activated, and a channel switching command is issued at a time interval shorter than that in the multi-channel reception mode, for example, at an interval of 3 to 5 seconds. In the memory 6c in the control circuit 6, all broadcast channels that can be received at a reception location with a certain reception sensitivity or higher are stored in ascending order of channel number, and the broadcast channels are read out in order according to the count value of the counter 6b. It is. That is, at the start of the CM broadcast, as shown in step (202), the timer 6a is operated, and at the same time, the broadcast channel stored at the address 100 of the memory 6c is read out, and this broadcast channel is used to receive the counter program. The tuner 3t of the unit 3 is given a tuning command. Next, when the first switching command is issued from the timer 6a, the counter 6 is set in the following step (204) according to the result of the judgment in the judgment step (203).
The count value of b advances by “1”. Here, the memory 6c
Is already known, and in the next determination step (205), it is determined whether or not reception of all the broadcast channels has been completed. If the channel selection of all the broadcast channels has not been completed, in step (206), the broadcast channels are read from the 100th + nth addresses of the memory 6c, and the process returns to step (20).
Return to 3). If it is determined that the tuning reception of all broadcast channels has been completed, in step (207), the count value of the counter 6b is cleared, and at the same time, the memory 6c
, A broadcast channel is read from address 100, and the process returns to step (203). Therefore, such a cyclic tuning operation is repeatedly performed during the CM broadcast period.

Thus, when the all-channel reception mode is selected, all receivable broadcast channels can be visually recognized in sequence from the two-screen display during the CM broadcast, regardless of the interest of the receiver. It can provide the widest possible judgment on the need for channel switching.

As described above, the television receiver 1 detects that the main program is broadcasting a CM,
During the broadcasting period, the video signal of the main program and the video signal of the sub-program are combined, and during the other periods, only the video signal of the main program is displayed on the screen. Rather than interrupting, the main program and the back program can be displayed on the screen combined, and at the end of the CM broadcast, the display switches to the main program instantaneously, so that the main program, which is the main viewing purpose, is not missed. Also, since the main program and the counter program are displayed at the same time, there is no discomfort to the viewer, and the broadcast that can be received without missing a program with higher viewing value than the main program broadcast in the counter program Effective reception of video is possible.

Further, since the control circuit 6 is configured to determine that a CM broadcast is being performed when the multiplex control signal of the audio multiplex broadcast indicates a stereo broadcast, the control signal is included as a pilot signal in the stereo multiplex broadcast. From the multiplex control signal, unless the CM broadcast is a bilingual broadcast, a dual audio broadcast, or a monaural broadcast, it is possible to detect that it is a stereo audio multiplex broadcast and to display the main program and the counter program on two screens. Processing corresponding to CM broadcasting is possible.

The synthesizing circuit 4 uses the video signal of the main program as a main screen, performs a blanking process on the video signal of the main program in a sub-screen display area set in a part of the main screen, and The signal compressed by thinning out the scanning lines of the video signal is inserted into the sub-screen display area to generate a video signal in which the sub-screen is synthesized with a part of the main screen. It can be displayed as a screen, and at the same time, the counterprogram can be displayed as a child screen that occupies a part of the parent screen, so that the child screen occupies only a part of the parent screen and most of the display of the parent screen is visible In addition, since the sub-screen is also displayed by thinning out the scanning lines, the entire image of the video can be displayed although the definition is low.

Further, since the main program receiver 2 and the counter program receiver 3 receive the main program and the counter program as they are transmitted from the transmitting station, respectively, the video signals of the main program and the counter program are combined. Can be selected widely, and while the cost burden must be prepared, high-quality two-screen display can be performed during the CM period.

In the above embodiment, a television receiver having dedicated receivers 2 and 3 respectively for the main program and the counter program is taken as an example. However, the tuners of the receivers 2 and 3 are simply used. For the main program broadcast, only one field, for example, the odd field, is received and stored in the main program dedicated memory, and the odd field is used as a substitute for the subsequent even field. Receives the broadcast of the counter-program, stores it in the memory for the counter-program, reads out the video data of the counter-program stored in the memory for the counter program while thinning it out, and reads out the video of the main program to reproduce the odd field twice. You can also fit in the department. In this case, although the resolution of the video of the main program slightly decreases like a slow-motion playback image, the manufacturing cost can be reduced by using a common tuner. in this case,
Although the image quality of the video signal of the main program for which the scanning line interpolation is performed is deteriorated, the video signal of the counter program for which the scanning line is thinned is not much different from the case where the video signal is received by a plurality of program receivers 2 and 3, and the CM period In view of the two-screen display inside, the dedicated receivers 2 and 3 for the main program and the counterprogram
As compared with the case of providing, the advantage of reducing the manufacturing cost can be enjoyed. The relationship between the main program and the counterprogram may be such that the counterprogram is displayed on the main screen and the main program is displayed on the subscreen.

[0025]

As described above, according to the present invention,
It detects that the main program is broadcasting a CM, and combines the video signal of the main program and the video signal of the sub-program during the CM broadcasting period,
During the rest of the period, only the video signal of the main program is displayed on the screen, so it is possible to display the screen combining the main program and the counterprogram instead of completely interrupting reception of the main program being viewed. It is possible to instantaneously switch to the display of the main program at the end of the CM broadcast, so that the main program, which is the main viewing purpose, is not overlooked. There is no problem, and excellent effects such as effective reception of receivable broadcast video can be achieved without missing a program having a higher viewing value than the main program broadcasted in the counter program.

Also, since the control circuit is configured to determine that a CM broadcast is being performed when the multiplex control signal of the audio multiplex broadcast indicates a stereo broadcast, the multiplex signal included as a pilot signal in the stereo audio multiplex broadcast is provided. As long as the CM broadcast is not a bilingual broadcast, a dual audio broadcast, or a monaural broadcast, the control signal can be detected as a stereo audio multiplex broadcast, and the main program and the counter program can be displayed on two screens. This produces effects such as enabling processing corresponding to broadcasting.

The synthesizing circuit sets a video signal of the main program as a main screen, performs a blanking process on the video signal of the main program in a sub-screen display area set as a part of the main screen,
A signal compressed by thinning out the scanning lines of the video signal of the counter program is inserted into the sub-screen display area to generate a video signal in which a sub-screen is synthesized with a part of the main screen. It can be displayed as the main screen in size, and at the same time, the back program can be displayed as a sub-screen that occupies a part of the main screen, so the sub-screen occupies only a part of the main screen and most of the display of the main screen is Can be seen,
In addition, since the scanning lines are also displayed on the sub-screen by thinning out the scanning lines,
Although the definition is inferior, an effect such that the entire image of the video can be displayed is obtained.

Further, since the program receiving means is configured to select and receive a specific broadcast channel designated in advance for the counter program during the CM broadcast period, the specific broadcast which the receiver is most interested in other than the main program is provided. As long as the channel is designated in advance, the broadcast channel can always be visually recognized from the two-screen display during the CM broadcast, and it is possible to provide a material for determining the necessity of channel switching.

Further, the program receiving means is configured to intermittently select and receive a plurality of broadcast channels specified in advance for the counterprogram during the CM broadcast period at predetermined time intervals, so that the receiver is most interested. As long as a plurality of broadcast channels having a channel are designated in advance, the designated broadcast channel can always be viewed in order from the two-screen display during the CM broadcast, providing a wide range of information for determining the necessity of channel switching. And the like.

Further, since the program receiving means is configured to intermittently select and receive all broadcast channels receivable for the counterprogram during the CM broadcast period at predetermined time intervals, the interest of the receiver is as follows. Regardless of the receivable broadcast channels, it is possible to visually recognize them in order from the two-screen display during the CM broadcast, and it is possible to provide the widest possible judgment on the necessity of channel switching. .

Also, the program receiving means has a main program receiver for selecting and receiving a main program and outputting a video signal, and a counter program receiver for selecting and receiving a counter program and outputting a video signal. The main program receiver and the counter program receiver can receive the main program and the counter program as they are transmitted from the transmitting station, respectively, and widely select the combination form of the video signals of the main program and the counter program. Although it is necessary to be prepared for the cost burden, there is an effect that a high-quality two-screen display is possible during the CM period.

The program receiving means selects and receives the main program and the counter program in a time-division manner, outputs the video signal of the main program by interpolating the scanning lines, and outputs the video signal of the counter program by thinning out the scanning lines. Since a single program receiver has a limit in receiving a main program and a counter-program as they are transmitted from the transmitting station, there is a limit in receiving the main program and the counterprogram as they are transmitted from the transmitting station. Degradation of the video signal is observed, but for the video signal of the counterprogram where the scanning lines are thinned, reception by a single program receiver does not cause any problem as a cause of the degradation in image quality. Considering that there is no big difference from the case of receiving by the receiver and that it is a two-screen display during the CM period, the manufacturing cost is reduced compared to the case where dedicated receivers for the main program and the counter program are provided You can enjoy the benefits An effect.

[Brief description of the drawings]

FIG. 1 is a schematic circuit diagram showing an embodiment of a television receiver according to the present invention.

FIG. 2 is a diagram showing a frequency spectrum distribution of an audio multiplex signal.

FIG. 3 is a diagram showing an example of a display screen of the display device shown in FIG.

FIG. 4 is a flowchart for explaining a channel selection reception operation when a multi-channel reception mode is set for a counter program.

FIG. 5 is a flowchart for explaining a channel selection reception operation when an all-channel reception mode is set for a counter program.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Television receiver 2 Main program receiver 3 Counter program receiver 4 Synthesis circuit 5 Display device 6 Control circuit 6a Timer 6b Counter 6c Memory

Claims (8)

[Claims] 1. A program receiving means for selecting and receiving a main program and a counter program and outputting a video signal of each program;
CM detecting means for detecting that M broadcast is in progress;
A synthesizing circuit that operates according to the output of the detecting means, synthesizes the video signal of the main program and the video signal of the sub-program during the CM broadcast period, and outputs only the video signal of the main program during other periods. And a display device for displaying the output of the synthesis circuit on a screen. 2. The CM detection means according to claim 1, wherein said multiplex control signal of the audio multiplex broadcast indicates a stereo broadcast.
2. The television receiver according to claim 1, wherein it is determined that broadcasting is in progress. 3. The synthesizing circuit sets a video signal of the main program as a main screen, performs a blanking process on the video signal of the main program in a sub-screen display area set in a part of the main screen, and 2. The television according to claim 1, wherein a signal compressed by thinning out scanning lines of a video signal of a program is fitted in the small screen display area to generate a video signal in which a small screen is combined with a part of a main screen. John receiver. 4. The television receiver according to claim 1, wherein the program receiving means selects and receives a specific broadcast channel specified in advance for the counterprogram during the CM broadcast period. 5. The program receiving means intermittently tunes in and receives a plurality of broadcast channels specified in advance for a counter-program at predetermined time intervals during the CM broadcast period. The television receiver as described. 6. The program receiving means according to claim 1, wherein the program receiving means intermittently selects and receives all broadcast channels receivable for the counter-program at predetermined time intervals during the CM broadcast period. Television receiver. 7. The program receiving means includes a main program receiver for selecting and receiving a main program and outputting a video signal, and a counter program receiver for selecting and receiving a counter program and outputting a video signal. The television receiver according to claim 1, wherein: 8. The program receiving means selects and receives a main program and a counter program in a time-division manner, outputs a video signal of the main program by scanning line interpolation, and outputs a video signal of the counter program by thinning out the scanning lines. 2. The method according to claim 1, further comprising a single program receiver for outputting.
The television receiver as described.