JPH0564204A - Television receiver - Google Patents

Abstract

(57) [Summary] [Configuration] The PSK demodulator 25 encodes the signal of the channel selected by the BS tuner 23, for example, M
The scrambled state of the USE signal and the PCM audio signal is detected. The system controller 41 uses the VHF / UHF tuner 12, the video processing circuit 2 based on the detection result.
4. MUSE down converter and JSB decoder 52
Select one of the color TV signals from the above to display the image on the cathode ray tube 36, and display the VHF / UHF tuner 12, D
1 of each audio signal from the A / A converter 26, MUSE down converter, JSB decoder 52 and CS decoder 53
Select one to output sound from speaker 38.
The V switch 32 is controlled. [Effect] The user can select the type of broadcast program, for example, NTSC.
Regardless of broadcast programs, high-definition broadcast programs and pay broadcast programs that comply with
You can watch or listen to the program on the selected channel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to a television receiver capable of receiving satellite broadcasting.

[0002]

2. Description of the Related Art As satellite broadcasting, currently, broadcasting satellites (Br
For example, BS3 channel (Japanese satellite broadcasting), BS7 channel (NHK) using oadcasting Satellite)
Also, BS11 channel (NHK) broadcasting (hereinafter referred to as BS broadcasting) is being performed, and in the near future, communication satellites (Communication Satellite) will be used to broadcast video and music (hereinafter referred to as CS broadcasting). Is planned to do.

In order to watch BS broadcast programs and listen to CS broadcast music programs, a dedicated receiving system is required. For example, a basic satellite broadcast receiving system for receiving BS broadcast includes a satellite broadcast antenna (hereinafter referred to as BS antenna), a BS converter, and a BS tuner. The BS antenna efficiently collects weak radio waves from a satellite and supplies the weak radio waves to a BS converter, and a so-called parabolic antenna is widely used for consumer use. BS converter is 12G received by BS antenna
The signal in the Hz band is amplified and frequency-converted into a signal in the 1 GHz band. In addition, the BS tuner selects (tunes to) a desired channel signal from the frequency-converted signals, and adds a so-called AGC (Automatic Gain) to the selected channel signal.
Control signal), IF amplification, FM demodulation, de-emphasis, energy diffusion removal and other signal processing, and outputs a video signal and an audio signal. Then, by supplying the video signal and audio signal from the BS tuner thus obtained to a television receiver or the like,
You can watch BS broadcast programs. Also, a television receiver having a built-in BS tuner is supplied.

By the way, in BS broadcasting and CS broadcasting, there are times when it is not possible to directly watch or listen to a program on a channel selected by the above-mentioned BS tuner. For example, it is a so-called high-definition broadcast program that is broadcast in a specific time zone on BS11 channel, a pay broadcast program that is broadcast on BS3 channel or CS broadcast, and the like.

That is, a high-definition broadcast program is broadcast as a so-called MUSE signal, and a pay broadcast program is
This is because the video signal and the audio signal are so-called scrambled and broadcast, that is, the high-definition broadcast program and the pay broadcast program are encoded and broadcast. Therefore, in order to watch a high-definition broadcast program, a MUSE decoder that decodes a MUSE signal, and a down converter for converting a high-definition video signal from the MUSE decoder into a video signal that conforms to the so-called NTSC system (hereinafter referred to as MUSE decoder and down converter). Simply MUSE
A down converter is required, and a descrambler (hereinafter referred to as a decoder) is required to watch a pay broadcast program.

Specifically, for example, in a television receiver having a built-in BS tuner, in order to watch a high-definition broadcast program, for example, the BS tuner is set to BS11 channel, and the signal of the selected channel is sent to this television. It is necessary to supply the signal to the MUSE down converter connected to the outside of the television receiver and to convert the signal converted from the MUSE down converter into the NTSC system to the television receiver again. Further, in order to watch a pay broadcast program, for example, the channel is set to the BS3 channel, the signal of the selected channel is supplied to the decoder connected to the outside, and the descrambled signal from the decoder is again supplied. It is necessary to supply it to the television receiver.

[0007]

As described above, in the conventional television receiver, in addition to the operation of setting the channel of the BS tuner, the user can watch the program such as the BS broadcast in addition to the high-definition broadcast program. The operation to switch and select the input (source) of the television receiver has to be performed based on the type of broadcasting such as pay broadcast programs, and the operation is very complicated.

The present invention has been made in view of the above circumstances, and for example, in a television receiver which has a built-in BS tuner and can receive BS broadcast and CS broadcast,
An object of the present invention is to provide a television receiver capable of watching a high-definition broadcast program, a pay broadcast program, and the like by a simple operation only by setting a channel of a BS tuner.

[0009]

According to the present invention, in order to solve the above problems, a satellite broadcast tuner is built-in, and a decoder for decoding a channel selection output by the satellite broadcast tuner is externally connected to the satellite broadcast tuner. In the television receiver displaying an image based on the tuning output of the above or the decoding output from the decoder on the display unit, a detecting means for detecting an encoding state of the tuning output from the satellite broadcasting tuner, and the satellite broadcasting tuner. The channel selection output from the satellite broadcast tuner is encoded based on the detection result of the switching means for selectively selecting the channel selection output from the decoder and the decoding output from the decoder and supplying the display section. If it is not encoded, select the decode output from the above decoder, and if it is not encoded, from the satellite broadcast tuner above. And having a control means for controlling said switching means so as to select the channel selection output.

[0010]

In the television receiver according to the present invention, the encoding state of the tuning output selected by the satellite broadcast tuner is detected, and when it is encoded, the decoding output obtained by decoding the tuning output by the decoder is detected. Select and select the channel selection output when not encoded, and display the image of the selected signal.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a television receiver according to the present invention will be described below with reference to the drawings. This example
The present invention is applied to a television receiver incorporating a so-called satellite broadcast tuner (hereinafter referred to as a BS tuner), and FIG. 1 is a block diagram showing a circuit configuration of this television receiver.

This television receiver includes a terrestrial broadcast receiving section for selecting a desired channel signal from so-called VHF or UHF signals and reproducing a color television signal and an audio signal conforming to the so-called NTSC system, and a broadcasting satellite ( Broadcasting
Color television signals conforming to the NTSC system by selecting a desired channel signal from satellite broadcasting using satellite (hereinafter referred to as BS broadcasting) or satellite broadcasting using communication satellite (communication satellite) (hereinafter referred to as CS broadcasting). And a satellite broadcast receiving unit that reproduces an audio signal, and each color Levi signal and each audio signal from the terrestrial broadcast receiving unit, the satellite broadcast receiving unit, and an external decoder unit, which will be described later, are selected by switching and displayed on the screen and from the speaker. It is composed of an output unit that outputs a sound and a control unit that controls the terrestrial broadcast reception unit to the output unit.

As shown in FIG. 1, the terrestrial broadcast receiving section includes an antenna 1 including a so-called Yagi-Uda antenna, for example.
1 is connected, and the terrestrial broadcast receiving unit is connected to the antenna 11
The desired channel signal is selected (tuned) from the VHF and UHF signals from, and the signal of the selected channel is subjected to signal processing such as amplification and detection to reproduce the color television signal and audio signal, and VHF / UHF tuner 1 for supplying the color television signal and the audio signal of the above to the above-mentioned output section
It consists of 2.

A signal of a desired channel is selected from the VHF and UHF signals from the antenna 11, and the color television signal and the audio signal of the selected channel are reproduced and output to the terrestrial broadcast receiving section. It is designed to be supplied to the department.

As shown in FIG. 1, the satellite broadcast receiving section amplifies a 12 GHz band signal of, for example, a BS broadcast received by a BS antenna 21, which is a so-called parabolic antenna, and converts it into a 1 GHz band signal. A BS converter 22 for frequency conversion is connected, and this satellite broadcast receiving unit is
A signal of a desired channel is tuned from the frequency-converted signal from the S converter 22, and a signal of the tuned channel is tuned to, for example, a so-called AGC (Automatic Gain Controller).
), IF amplification, FM demodulation, de-emphasis, energy diffusion removal, and other signal processing to obtain a video signal and a so-called P signal.
SK (Phase Shift Keying) modulation and PCM (Pulse Cod)
BS tuner 23 that reproduces the e-modulated audio signal (hereinafter referred to as PCM audio signal) and supplies these signals to the external decoder section, and the BS tuner 23.
The video processing circuit 24 for converting the video signal from the above into a color television signal conforming to the NTSC system, and the PSK-modulated PCM audio signal from the BS tuner 23 are demodulated to reproduce the PCM audio signal, and the PCM audio signal is reproduced. PSK demodulator 25 for detecting scrambled state of signals
And a digital / digital signal supplied from the PSK demodulator 25 after being converted into an analog signal and supplied to the output section.
Analog (hereinafter referred to as D / A) converter 26 and the above BS
A level detection circuit 27 that detects the reception level of the BS antenna 21 based on the level of the output of the tuner 23, for example, in the 8 MHz band, and supplies the reception level to the control unit.
And external output terminals 28a, 28b, 28c for supplying the output of the BS tuner 23 to the external decoder section.
And an external input terminal 28d for supplying a keyed AFC pulse in a so-called MUSE signal from the external decoder section to the BS tuner 23.

The BS antenna 21 efficiently collects weak radio waves from the BS satellites or CS satellites to produce BS signals.
The converter 22 is supplied to the BS converter 22,
The signal is frequency-converted into a Hz band signal and supplied to the BS tuner 23. Then, this satellite broadcast receiving unit uses a desired channel such as BS3 channel (Japanese satellite broadcast), BS7.
Channel (NHK), BS11 channel (NH
K), a signal of a desired channel of CS broadcasting is selected, and when the signal of the selected channel is, for example, a MUSE signal or a scrambled signal, that is, an encoded signal, the external output terminals 28a ... It is adapted to be supplied to the external decoder section via 28c. On the other hand, in the case of other signals, it is converted into a color television signal conforming to the NTSC system and supplied to the output section, and at the same time, an audio signal is reproduced and these color television signal and audio signal are supplied to the output section. It has become.

On the other hand, when the BS broadcast is a so-called high-definition broadcast program or a pay broadcast program, that is, when a MUSE signal or a scrambled signal is received, the television receiver receives the signal from the BS tuner 23. In accordance with the NTSC system, an external decoder unit for converting an unscrambled color television signal and an unscrambled audio signal is connected, and this external decoder unit is connected as shown in FIG. 1 described above. ,
After decoding the MUSE signal supplied from the BS tuner 23 through the external output terminal 28c to reproduce a high-definition video signal, the high-definition video signal is converted into a color television signal conforming to NTSC and time-divided into so-called vertical blanking periods. The so-called quasi-instantaneous compression differential PCM audio signal (DPCM Audio Near-instaneous Compressing and Expa
nding) to reproduce the audio signal, and to supply these color television signal and audio signal to the output section.
USE down converter 51 and the above BS tuner 23
From the external output terminal 28b, the scrambled video signal is descrambled to reproduce a color television signal, and PSK modulation and scrambled P received by frequency division multiplexing the video signal are received.
After demodulating the CM audio signal, this scrambled P
A JSB decoder 52 that descrambles and decodes a CM audio signal to reproduce the audio signal, and supplies the color television signal and the audio signal to the output unit,
After demodulating the PSK-modulated and scrambled PCM audio signal supplied from the S tuner 23 through the external output terminal 28a, the scrambled PCM audio signal is descrambled and decoded to reproduce the audio signal. It is composed of a CS decoder 53 for supplying an audio signal to the output section.

The external decoder section receives the signal from the BS tuner 23 when the satellite broadcast is, for example, a high-definition broadcast program or a pay broadcast program, that is, when the received signal is a MUSE signal or a scrambled signal. In accordance with the NTSC system, it converts into an unscrambled color television signal and an unscrambled audio signal, that is, decodes them, and supplies these decoded color television signal and audio signal to the output section. There is.

The output unit, as shown in FIG.
An external input terminal 31a connected to the external decoder section,
31b, 31c, 31d, 31e, 31f and the above VH
F / UHF tuner 12, BS tuner 23, MUSE
Each color television signal from the down converter 51 and the JSB decoder 52 is switched and selected, and the VH
F / UHF tuner 12, D / A converter 26, MUSE
An AV switch 32 for switching and selecting each audio signal from the down converter 51, the JSB decoder 52, and the CS decoder 53, a so-called video amplifier circuit, a color signal reproducing circuit, and the like are provided, and the color television signal selected by the AV switch 32 is selected. A video process circuit 33 for converting to a so-called RGB signal, a P in P circuit 34 for processing a so-called picture-in-picture (hereinafter referred to as P in P), and the P in P circuit 3
The RGB switch 35 for switching the RGB signal from the control unit 4 and the RGB signal for displaying, for example, operation contents from the control unit and supplying the RGB signal to the video process circuit 33.
A cathode ray tube 36 for displaying an image based on the RGB signal from the video process circuit 33, an audio process circuit 37 for performing signal processing such as sound quality adjustment on the audio signal selected by the AV switch 32, Based on the audio signal from the audio process circuit 37,
And a speaker 38 that emits sound.

Further, as shown in FIG. 1 described above, the AV switch 32 includes the MUSE down converter 5
1. The video process by switching and selecting each color television signal supplied from the JSB decoder 52 via the external input terminals 31a and 31b and each color television signal from the VHF / UHF tuner 12 and the video processing circuit 24. Changeover switch 32a supplied to the circuit 33
And each color television signal supplied from the MUSE down converter 51 and the JSB decoder 52 via the external input terminals 31a and 31b and the VHF /
A changeover switch 32b for selectively selecting each color television signal from the UHF tuner 12 and the video processing circuit 24 and supplying it to the PinP circuit 34, the MUSE down converter 51, the JSB decoder 52, and the CS decoder 53.
From each of the audio signals supplied from the respective external input terminals 31c to 31f and the VHF / UHF tuner 1 described above.
2. A selector switch 32c for selectively selecting each audio signal from the D / A converter 26 and supplying it to the audio process circuit 37.

Under the control of the control unit, the output unit displays the image of the selected channel on the cathode ray tube 36 and outputs the sound of the selected channel from the speaker 38. ing. In addition, the display of PinP, the status of the television receiver such as the reception level, and the operation content (hereinafter referred to as a menu) such as a recording procedure are displayed as necessary.

The control section, as shown in FIG.
For example, a control signal from an operation unit or a so-called remote controller (not shown) provided on the front surface of the television receiver, the P
A system for controlling the terrestrial broadcast receiving section to the output section based on the scrambled state of the PCM audio signal or the like from the SK demodulator 25, the reception level from the level detection circuit 27, and the presence or absence of the color television signal from the video process circuit 33. A controller 41 and, for example, a non-volatile memory,
Memory 42 in which programs such as control contents are stored
And a BS microcomputer (hereinafter referred to as BS microcomputer) 43 for controlling the selection of the BS tuner 23 based on the data from the system controller 41.
A menu display based on the data from the system controller 41 and a D / A converter 44 that converts the data from the system controller 41 into an analog signal and controls, for example, a volume control volume (not shown) and the like. Based on the data from the display microcomputer 45 for controlling the CRT and the system controller 41.
And a D-CONV 46 that controls the deflection of the.
The system controller 41, the video process circuit 33, the P in P circuit 34, the audio process circuit 37, and the memories 42 to D-CONV 46 are connected to each other by a so-called I ² C bus.

Then, this control unit, for example, when the channel is set to the BS7 channel in accordance with the operation performed by the user using the remote controller, the satellite broadcasting B
The S7 channel is selected, the color television signal from the video processing circuit 24 and the audio signal from the D / A converter 26 are selected by the AV switch 32, and the image of this channel is displayed on the cathode ray tube 36, and at the same time, this channel is displayed. Is output from the speaker 38.

When the channel is set to the BS3 channel, for example, the PCM of the BS3 channel is set to the PCM.
If the scrambled state of the audio signal is judged and the scramble is applied (paid broadcast program), the BS tuner 2
The video signal from 3 is sent to the JSB decoder 52 once, and J
The AV decoder 32 selects the color television signal and the audio signal which are decoded by the SB decoder 52, that is, descrambled, and the image of this channel is selected by the cathode ray tube 3.
6 is displayed, and control for outputting the sound of this channel from the speaker 38 is performed. on the other hand,
When not scrambled (free broadcast program), the color television signal and the audio signal from the video processing circuit 24 are selected by the AV switch 32 to display the image of this channel on the cathode ray tube 36, and at the same time, display the image of this channel. The control for outputting the sound from the speaker 38 is performed. When the user operates the Pin P as necessary, the control unit A sets the BS broadcast program as a so-called main screen and the terrestrial broadcast program as a so-called sub screen.
The V switch 32 and the P in P circuit 34 are controlled. In addition, when the user performs a menu display operation as necessary, this control unit controls the display microcomputer 45 so as to display the recording procedure of the BS broadcast in the sub-screen in the menu format. There is.

Specifically, for example, when a user sets a channel number using a remote controller in order to watch a program of a desired channel in terrestrial broadcasting, the system controller 41 causes the system controller 41 to output a control signal indicating the channel number from the remote controller. To control the VHF / UHF tuner 12 so as to select the signal of the set channel and select the color television signal and the audio signal from the VHF / UHF tuner 12,
32c is controlled. Then, the selected color television signal is supplied to the video process circuit 33, and the audio signal is supplied to the audio process circuit 37.

The video process circuit 33 converts the color television signal from the changeover switch 32a into an RGB signal and supplies it to the cathode ray tube 36, and the audio process circuit 37.
Supplies the audio signal from the changeover switch 32c to the speaker 38 after performing signal processing such as sound quality adjustment. As a result,
The user can watch a program on a desired channel in terrestrial broadcasting.

At this time, the system controller 41 sends data indicating the channel number to the display microcomputer 45 via the I ² C bus so that the user can confirm the operation content, for example, the set channel number. Supply. Based on this data, the display microcomputer 45 displays the RG for displaying the channel number in the upper right corner of the screen, for example.
The B signal is supplied to the video process circuit 33 via the RGB switch 35. Then, the video process circuit 33
Converts the color television signal from the changeover switch 32a into an RGB signal as described above, and multiplexes the RGB signal from the RGB switch 35 with this RGB signal for so-called superimposing. As a result, the channel number is superimposed and displayed on the image of the terrestrial broadcast program.

Next, for example, when the user uses the remote controller to set, for example, BS11 channel in order to watch a program of a desired channel in BS broadcasting, the system controller 41 sends a control signal indicating the channel number from the remote controller. The BS tuner 23 is controlled so as to receive and select the BS11 channel signal, and based on, for example, the loss of synchronization of the PCM audio signal from the PSK demodulator 25 and the reception level from the level detection circuit 27,
It detects whether the current program is an NTSC-compliant normal broadcast program or a high-definition broadcast program. Then, in the case of a normal broadcast program, the AV switch 32 is controlled so as to select the color television signal from the video processing circuit 24 and the audio signal from the D / A converter 26. On the other hand, in the case of a high-definition broadcast program, the AV switch 32 is controlled so as to select the color television signal and the audio signal from the MUSE down converter 51.

That is, the audio signal of the normal broadcast program is P
The audio signal of the high-definition broadcast program is converted into a CM audio signal, PSK-modulated, and frequency-division multiplexed into a video signal. It is division-multiplexed, and the system controller 41 broadcasts normally, for example, in a good reception state, that is, when the reception level detected by the level detection circuit 27 is high and the PSK demodulator 25 synchronizes the PCM audio signal. On the other hand, if the reception level is high and the synchronization is out of sync, it is determined to be a high-definition broadcast program. In the case of a normal broadcast program, the changeover switches 32a and 32c are controlled so as to select the color television signal from the video processing circuit 24 and the audio signal from the D / A converter 26. On the other hand, in the case of a high-definition broadcast program, the changeover switches 32a and 32c are controlled so as to select the color television signal and the audio signal from the MUSE down converter 51.
In addition, the discrimination from the normal broadcast program or the high-definition broadcast program is performed by using the MUSE down converter 51 and the external input terminal 2
Keyed AF supplied to BS tuner 23 via 8d
It may be performed based on the presence or absence of the C pulse.

Then, the selected color television signal is supplied to the video process circuit 33 and the audio signal is supplied to the audio process circuit 37. As a result, the user can automatically watch the normal broadcast program or the high-definition broadcast program by setting the desired channel regardless of the type of the BS broadcast program (normal broadcast program / high-definition broadcast program).

Further, for example, the user confirms that the broadcasting is switched from the normal broadcasting program to the high-definition broadcasting program, and the source of the color television signal is automatically switched from the video processing circuit 24 to the MUSE down converter 51. As possible, the system controller 41 supplies the display microcomputer 45 with data indicating that the color television signal from the MUSE down converter 51 is selected via the I ² C bus. Based on this data, the display microcomputer 45 supplies an RGB signal for displaying “MUSE down converter” in the upper right corner of the screen to the video process circuit 33 via the RGB switch 35, for example. Then, the video process circuit 33 converts the color television signal from the changeover switch 32a into an RGB signal as described above, and multiplexes the RGB signal from the RGB switch 35 with this RGB signal for so-called superimposing. .. As a result, the channel number is superimposed and displayed on the image of the high-definition broadcast program.

That is, at present, the high-definition broadcast program is performed on the same channel as the normal broadcast program at different time zones, and is based on, for example, the presence or absence of a keyed AFC pulse, or the reception level and the PCM audio signal being out of synchronization. Then, it is determined whether the currently received broadcast program is a normal broadcast program or a high-definition broadcast program. When the broadcast program is a normal broadcast program, the color television signal from the video processing circuit 24 and D /
The audio signal from the A converter 26 is selected, and in the case of a high-definition broadcast program, control is performed so as to automatically select a color television signal and an audio signal obtained by being decoded by the MUSE down converter 51 connected to the outside. As a result, the user can watch the normal broadcast program or the high-definition broadcast program by a simple operation of setting the channel of the BS tuner 23 to a desired channel regardless of the type of the BS broadcast program.

If necessary, the user uses the remote controller to perform an operation for displaying an image of the terrestrial broadcast program on the small screen, for example, while watching the BS broadcast program as described above. Then, the system controller 41 receives a control signal corresponding to this Pin P operation from the remote controller,
The VHF / UHF tuner 12 is controlled so as to select the set channel signal in the terrestrial broadcasting, and the changeover switch 32b of the AV switch 32 is controlled so as to select the color television signal from the VHF / UHF tuner 12. To do. Then, the selected color television signal is supplied to the P in P circuit 34. P in P circuit 34
Converts the color TV signal into an RGB signal,
The B signal is supplied to the video process circuit 33 via the RGB switch 35 as a child screen signal. As a result, the user can watch the BS broadcast program as a parent screen and the terrestrial broadcast program as a child screen, for example.

Next, for example, when the user uses the remote controller to set, for example, BS3 channel in order to watch a program of a desired channel in BS broadcasting, the system controller 41 sends a control signal indicating the channel number from the remote controller. The BS tuner 23 is controlled so as to receive and select the BS3 channel signal, and the current program is not scrambled based on the scrambled state of the PCM audio signal from the PSK demodulator 25. Detects whether the program is a scrambled pay program. Then, in the case of a free broadcast program, the AV switch 32 is controlled so that the color television signal from the video processing circuit 24 is selected and the audio signal from the D / A converter 26 is selected. On the other hand, in the case of a pay broadcast program, the AV switch 32 is controlled so as to select the color television signal and the audio signal from the JSB decoder 52.

That is, the voice signal of the free broadcast program is converted into the PCM voice signal as described above, and at the same time, P
SK modulated and frequency division multiplexed to the video signal,
The audio signal of the pay broadcast program is converted into a PCM audio signal, then scrambled, PSK-modulated and frequency-division-multiplexed with the video signal, and the system controller 41 is detected by the PSK demodulator 25, for example. P
It is determined whether the program is a pay broadcast program or a free broadcast program based on the 8th bit of the so-called range bit indicating the scrambled state of the CM audio signal. In the case of a free broadcast program, the changeover switches 32a and 32c are controlled so as to select the color television signal from the video processing circuit 24 and the audio signal from the D / A converter 26. On the other hand, in the case of a pay broadcast program, the changeover switch 32 is used to select the color television signal and the audio signal from the JSB decoder 52.
a, 32c are controlled. The discrimination from the pay broadcast program or the free broadcast program may be made based on the 12th bit of the so-called control bit of the PCM audio signal indicating the scrambled state of the video signal.

The selected color television signal is supplied to the video process circuit 33 and the audio signal is supplied to the audio process circuit 37. As a result, the user can watch a free broadcast program or a pay broadcast program simply by setting the desired channel regardless of the type of broadcast program (whether or not scrambled).

Next, for example, when the user sets a channel for CS broadcasting using the remote controller in order to listen to music on a desired channel in CS broadcasting, the system controller 41 controls the remote controller to indicate the channel number. The BS tuner 23 is controlled so as to receive a signal and select a signal of a set channel.
For example, based on the scrambled state of the PCM audio signal from the PSK demodulator 25, it is detected whether the current music program is an unscrambled free broadcast program or a scrambled pay broadcast program. Then, in the case of a free broadcast program, the AV switch 32 is controlled so as to select the audio signal from the D / A converter 26. On the other hand, in the case of a pay broadcast program, the AV switch 32 is controlled so as to select the audio signal from the CS decoder 53.

That is, the voice signal of the free broadcast program is converted into the PCM voice signal as described above, and at the same time, P
The SK-modulated and frequency-division-multiplexed audio signal of the pay broadcast program is scrambled after being converted into a PCM audio signal, and the PSK-modulated and frequency-division-multiplexed audio signal. ,
Based on the 8th bit of the so-called range bit that indicates the scrambled state of the PCM audio signal detected by the PSK demodulator 25, it is determined whether the program is a pay broadcast program or a free broadcast program, and if it is a free broadcast program, D / A conversion is performed. The changeover switch 32c is controlled so as to select the audio signal from the device 26. On the other hand, in the case of a pay broadcast program, the changeover switch 32c is controlled so as to select the audio signal from the CS decoder 53.

Then, the selected audio signal is supplied to the audio process circuit 37. As a result, the user
Regardless of the type of broadcast program (free / paid), it is possible to listen to the music of the free broadcast program or the music of the pay broadcast program only by setting the desired channel.

As described above, in the television receiver of this embodiment, the encoded state of the signal of the channel selected by the BS tuner 23, for example, MUSE signal, PCM.
The scrambled state of the audio signal or the video signal is detected based on the synchronization state of the PCM audio signal, the presence / absence of the keyed AFC signal, the 8th bit of the range bit, etc., and the VHF / UHF tuner 12 and the video are detected based on the detection result. Processing circuit 24, MUSE down converter and JSB decoder 5
Select one of each color TV signal from 2 to display the image and display VHF / UHF tuner 12, D / A
By selecting one of the audio signals from the converter 26, the MUSE down converter, the JSB decoder 52, and the CS decoder 53 and outputting the audio, the user can select a broadcast program type, for example, a broadcast compliant with NTSC. Regardless of a program, a high-definition broadcast program, or a pay broadcast program, it is possible to watch or listen to the program of the selected channel simply by setting the desired channel.

[0041]

As is apparent from the above description, a satellite broadcast tuner is built-in, and a decoder for decoding the channel selection output by the satellite broadcast tuner is externally connected, and the channel selection output from the satellite broadcast tuner or the decoder output. In a television receiver that displays an image based on the decoded output on the display unit, the encoding state of the tuning output from the satellite broadcasting tuner is detected, and the tuning output from the satellite broadcasting tuner is encoded based on the detection result. The user can automatically select the decode output from the decoder when it is selected, and the channel selection output from the satellite broadcast tuner when it is not encoded. Set to the desired channel regardless of NTSC-compliant broadcast program, high-definition broadcast program, or pay broadcast program. By a simple operation, it is possible to hear or watch the channel of the program tunes.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of a television receiver to which the present invention has been applied.

[Explanation of symbols]

 23 ... BS tuner 25 ... PSK demodulator 27 ... Level detection circuit 32 ... AV switch 41 ... System controller 51 ... MUSE down converter 52 ... JSB decoder 53 ... CS decoder

Claims (1)

[Claims] 1. A satellite broadcast tuner is built in, and a decoder for decoding a channel selection output by the satellite broadcast tuner is externally connected, and an image based on the channel selection output from the satellite broadcast tuner or the decode output from the decoder is displayed. In the television receiver displayed on the display unit, the detection means for detecting the encoding state of the tuning output from the satellite broadcasting tuner, the tuning output from the satellite broadcasting tuner, and the decoding output from the decoder are selected by switching. Based on the switching means supplied to the display section and the detection result of the detecting means, when the tuning output from the satellite broadcast tuner is encoded, the decoding output from the decoder is selected and encoded. When not present, control for controlling the switching means so as to select the channel selection output from the satellite broadcast tuner A television receiver having means.