JPH05199470A - Television receiver - Google Patents

Abstract

PURPOSE:To provide a TV receiver which contains a function to freely enjoy another program in a different channel in a CM period and to automatically switch the program in a different channel to the original program. CONSTITUTION:A switch means 9 is actuated so that the channel received by a 2nd tuner 2 is supplied to a receiving circuit while a 1st tuner 1 is receiving a channel contained in a sound multiplex signal. As a result, the program received by the tuner 2 is shown on a CRT. Under such conditions, if a sound multiplex mode deciding means 10 decides that no sound multiplex signal is contained in the sound signal of the channel received by the tuner 1 and the sound multiplex signal has no change, a return means switches the means 9 to supply the original channel received by the tuner 1 to the receiving circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver which automatically switches channels depending on whether or not a received radio wave contains a voice multiplex signal.

[0002]

2. Description of the Related Art Television receivers on the market in recent years have various convenient functions. For example, a remote controller or a two-screen television can be exemplified. The functions of the remote control include direct channel selection, channel up / down selection, power on / off of the television receiver, volume adjustment, TV / VTR switching, and parent / child screen switching on a dual-screen television receiver. Can be exemplified. Also, some of the most recent ones are capable of program search. This is such that when a search command is issued, the channel is moved up or down within a certain time and then the original channel is returned to. For example, if you perform this search while watching 4 commercial channels, 6, 8, 10,
12, 1, 3 and the channels are sequentially switched at regular intervals to receive an image, and the original 4 channels are restored.

[0003]

However, it can be said that such a conventional search function is very convenient in terms of confirming what the back program is. , It was not possible to enjoy the searched program because the search time was short.
This search is often performed when the channel being watched becomes a commercial (commercial).

In view of the above, the present invention provides a television receiver having a function of fully enjoying a back program during a commercial period and automatically switching from the back program to the program being watched when the commercial ends. With the goal.

[0005]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a first tuner and a second tuner for generating a video signal and an audio signal of a desired channel from a received radio wave, and a first tuner. An audio multiplex mode determination means for determining whether or not the generated audio signal includes an audio multiplex signal, and a video signal and an audio signal output from the first tuner or the second tuner are selectively switched. And the switching means for supplying to the image receiving circuit in the subsequent stage and the audio multiplex mode determining means determines that the audio multiplex signal is not included. And a return unit for operating the switching unit to return to the output from the tuner.

[0006]

The television receiver of the present invention constructed as described above operates as follows. When the switching means is operated and the channel received by the second tuner is supplied to the image receiving circuit while the channel containing the audio multiplexed signal is being received by the first tuner, the program received by the second tuner is displayed on the CRT. It is projected. In this state, when the audio multiplex mode determining means determines that the audio multiplex signal is not included in the audio signal of the channel received by the first tuner or the audio multiplex signal has changed, the restoring means operates the switching means. The channel being switched is supplied to the image receiving circuit with the channel being received by the first tuner. As a result, the program being received by the first tuner is displayed on the CRT by switching from the program being received by the second tuner.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram of a television receiver according to the present invention. 2 for this television receiver
Two TV tuners 1 and 2 are provided. The TV tuner 1 is a tuner used in a normal reception state, and the TV tuner 2 is a tuner for receiving another channel while the CM is being received by the TV tuner 1. In this embodiment, the back program is received during the CM, but it may be replaced with a video input or a BS tuner if the video from the VTR or the like is acceptable. Each of the television tuners 1 and 2 has tuners 3 and 4 for receiving a desired channel, PiF / SiFs 5 and 6 for generating a video signal, and audio multiplex decoders 7 and 8 for generating an audio multiplex signal. Are provided respectively.
The PiF / SiF5 provided in the TV tuner 1 and the PiF / SiF6 provided in the TV tuner 2 are selectively switched by the switching circuit 9 functioning as a switching means, and the switched video signal is transferred to the image receiving circuit. Is output. Similarly, the audio multiplex decoders 7 and 8 are selectively switched by the switching circuit 9, and the switched audio signal is output to the image receiving circuit. The TV tuner 1 functions as a first tuner, and the TV tuner 2 functions as a second tuner.

The signal from the audio multiplex decoder 7 is also output to the audio multiplex mode determination circuit 10. Based on the signal from the audio multiplex decoder 7, the audio multiplex mode determination circuit 10 determines whether the channel being received by the television tuner 1 contains an audio multiplex signal or whether the audio multiplex signal has changed. It is a thing. CM
The determination unit 11 determines whether the channel being received is receiving CM based on the signal from the audio multiplex mode determination circuit 10. Whether or not it is a CM is determined by whether or not the audio signal is audio multiplex, that is, stereo. Most commercials are based on being stereo broadcast. The program content is determined by determining whether the audio signal is monaural or dual audio. The switching state determination control unit 12 outputs a switching command for the channels of the tuner 3 and the tuner 4 and a switching command for the switching circuit 9. The audio multiplex mode determining circuit 10 serves as an audio multiplex mode detecting means, and the CM determining unit 1
1 and the switching state determination control unit 12 each function as a returning unit. The switching control unit 13 is the switching state determination control unit 12
The switching circuit 9 is operated based on the signal from the. An interrupt command for channel switching or the like is output from the remote control transmission unit 14 provided in the remote control, but the command from this is received by the remote control light receiving unit 15 and output to the switching state determination control unit 12. become.
Examples of this interrupt instruction include channel selection and channel up / down instruction.

Next, the operation of the television receiver of the present invention will be described based on the flow chart shown in FIG. 2 with reference to FIG. First, the TV tuner 1 receives the channel A. The selection of this channel is performed based on the switching state determination control unit 12. In this state, monaural (MO) or dual voice (MT) is received (S1). When the channel A is switched to the CM in this state, the audio signal is switched to stereo (ST), which is detected by the audio multiplex mode determination circuit 10 and the CM determination unit 11 recognizes that the CM is being received. (S2). This recognition in the CM determination unit 11 is notified to the switching state determination control unit 12.

When an interrupt signal for channel switching or the like is output from the remote control transmitter 14 while the CM is being received, the remote controller light receiver 15 receives the interrupt signal and the interrupt signal is sent to the switching state determination controller 12. Is output to. Upon receiving this, the switching state determination control unit 12 issues a command to the switching control unit 13 to switch the switching circuit 9, and at the same time outputs a command to the TV tuner 2 to receive the channel selected by the interrupt signal. However,
The channel of the TV tuner 1 is maintained (S3). By this interrupt operation, the video signal and the audio signal from the television tuner 2 are output to the image receiving circuit, and the channel B is received in the television tuner 2 (S4).

Immediately after the above processing is completed, the switching state determination control unit 12 waits for the CM determination unit 11 to make a CM termination determination (S5). When the CM judgment unit 11 detects that the CM of the channel A being received by the television tuner 1 has ended, the switching state judgment control unit 12 instructs the switching control unit 13 to switch the switching circuit 9, As a result, the video signal and the audio signal from the TV tuner 1 are output to the image receiving circuit again, and the channel A is received by the TV tuner 1 (S).
6).

FIG. 4 shows another embodiment of the present invention. In this embodiment, a two-screen television receiver is assumed, and when the channel of the parent screen becomes CM, the channel selected for the child screen is selected by the interrupt signal from the remote controller as the parent screen. , And the CM of the channel displayed on the parent screen is displayed on the child screen. When the CM of the channel displayed on the master screen is finished, the master screen and the slave screen are automatically switched to erase the slave screen. 4, those having the same functions as those shown in FIG. 1 are designated by the same reference numerals, and the explanation of the functions will be omitted in the explanation of the operation. The BS tuner 20 is a tuner for receiving a BS broadcast, and the reference numeral 21 is a video signal input terminal. The microcomputer 22 has a function including the CM determination unit 11 and the switching state determination control unit 12 shown in FIG. The switching circuits 9a and 9b can be independently switched by the switching control unit 13. Therefore, it is possible to display the image from the BS tuner 20 on the main screen and the image from the video input terminal 21 on the small screen.

The television receiver of the present embodiment having the above-described structure operates as follows. Less than,
This operation will be described with reference to FIG. First, the main screen receives the channel CH1 of the TV tuner 1. And the sub screen is channel C of BS tuner 20.
It is ready to receive H2. In this state, when the channel of the TV tuner 1 on the main screen enters the CM, the channel CH3 of the BS tuner 20 selected for the sub screen is displayed on the main screen on condition that the interrupt signal from the remote controller is received. The CM of the channel displayed on the parent screen is displayed on the child screen. When the CM of the channel displayed on the main screen ends, the main screen returns to the state of receiving the channel of the TV tuner 1, and the sub screen disappears. In this embodiment, the CM of the channel displayed on the main screen will be displayed on the child screen.
If the program that continues to be broadcast to is stereo broadcasting,
It will be surely prevented that the timing of automatic restoration is missed.

[0014]

As is apparent from the above description, according to the present invention, when it is determined by the audio multiplex mode determination means that the audio multiplex signal is not included and there is no change in the audio multiplex signal, Since the switching means is operated to restore the video signal and the audio signal supplied to the image receiving circuit by the restoring means to those output from the first tuner, the audio multiplex signal is included. At the same time as the CM ends, the program received by the second tuner is automatically switched to the program received by the first tuner. That is, the back program can be viewed during the CM period, and the program viewed from the back program can be automatically restored at the same time as the end of the CM.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a television receiver according to the present invention.

FIG. 2 is an operation flowchart showing an example of operation of the receiver shown in FIG.

FIG. 3 is a diagram for explaining an operation mode of the receiver shown in FIG.

FIG. 4 is a schematic block diagram showing another embodiment.

FIG. 5 is a diagram for explaining an operation mode of the receiver shown in FIG.

[Explanation of symbols]

1, 2 TV tuners (first and second tuners) 3, 4 tuners 9 switching circuit (switching means) 10 audio multiplex mode determining circuit (audio multiplex mode determining means) 11 CM determining unit (audio multiplex mode determining means) 12 switching State determination control section (returning means) 13 Switching control section (switching means)

Claims (1)

[Claims] 1. A first tuner and a second tuner that generate a video signal and an audio signal of a desired channel from a received radio wave, and whether an audio multiplex signal is included in the audio signal generated by the first tuner, An audio multiplex mode determination means for determining whether or not there is a change in the audio multiplex signal, and a video signal and an audio signal output from the first tuner or the second tuner are selectively switched to a subsequent image receiving circuit. When it is determined by the switching means for supplying and the audio multiplex mode determining means that the audio multiplex signal is not included, the video signal and the audio signal to be supplied to the image receiving circuit are output from the first tuner. A television receiver comprising: return means for operating the switching means to return to the original one.