JPH08130691A - Television signal receiver - Google Patents

Abstract

PURPOSE: To provide a television signal receiver of reduced power consumption capable of receiving a high definition television broadcast program by not supplying a power supply to a MUSE-NTSC conversion circuit when a television broadcast program by the existing NTSC system is received. CONSTITUTION: The receiver is provided with an NTSC discrimination circuit 131 discriminating whether or not a BS tuner 108 receives an NTSC signal and a switch circuit 132 switching off a power supply to be supplied to a MUSE- NTSC conversion circuit 112. When the discrimination circuit 131 discriminates the reception of an NTSC signal, the switch circuit 132 is open to interrupt the power supply to the MUSE-NTSC conversion circuit 112.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television signal receiver, and more particularly, to a satellite broadcast receiving device and when the signal received by the satellite broadcast receiving device is a high definition signal such as a MUSE signal. The present invention relates to a television signal receiver having a built-in conversion device for converting this into a baseband signal or an NTSC signal.

[0002]

2. Description of the Related Art Broadcasting satellite services include current NTSC television broadcasting and MUSE (Multiple Subnyquist Samp) proposed by the Japan Broadcasting Corporation.
ling Encoding) High-definition test broadcasting by transmission method is being implemented. Therefore, it is desirable that the television signal receiver capable of receiving the satellite broadcast can receive not only the current television broadcast but also the high-definition broadcast. As such a desirable receiver,
For example, there is one described in JP-A-5-14832.

A prior art of such a television signal receiver is shown in FIG. The example shown in FIG. 3 is an example of a receiver capable of receiving high-definition broadcasting by converting the received MUSE signal, which is a high-definition signal, into an NTSC signal.

In FIG. 3, 101 is UHF / VHF.
A signal receiving antenna (hereinafter referred to as U / V), 102 is a satellite broadcast signal (hereinafter referred to as BS signal) receiving antenna, 1
03 is a video input terminal, 104 is a U / V antenna signal input terminal, 105 is a BS antenna signal input terminal, 106 is a U / V tuner, 107 is a U / V signal detection circuit, 108
Is a BS tuner, 109 is a BS signal detection circuit, 110 is a U / V signal processing circuit, and 111 is a BS signal processing circuit. Further, 112 is a MUSE-NTSC conversion circuit, 11
3 is a first signal switching circuit, 114 is a second signal switching circuit, 115 is a Y / C separation circuit, 116 is a color demodulation circuit, 1
Reference numeral 17 is a matrix circuit, 118 to 120 are cathode ray tubes, 122 is a power supply circuit, 123 is a control microcomputer, 1
24 is an AC power input terminal, 125 is a system power output terminal, 126 is a system control output terminal, 127 is a MUSE-NTSC discriminating circuit, and 128 is a recording output terminal.

In the television signal receiver shown in FIG. 3, when a high-definition signal (scanning line number 1125, frame frequency (number of images per second) 30 Hz) is received by a satellite broadcast receiving device, this is received by a MUSE-NTSC conversion circuit. 112
Since the signal is converted into the NTSC signal in, the normal television signal processing can be performed, and the recording on the home VTR is also possible.

[0006]

In the above-mentioned conventional television signal receiver, the BS signal processing circuit 1 is used.
11 and the MUSE-NTSC conversion circuit 112 are always supplied with power at the same time, the power is supplied to the MUSE-NTSC conversion circuit 112 that does not need to operate during the time when the signal received by the satellite broadcast receiving device is an NTSC signal. There was a problem that it was supplied and consumed unnecessary power.

In the configuration shown in FIG. 3, the MU
In the SE-NTSC discrimination circuit 127, for example, MUSE-
In order to determine whether the MUSE video or audio PLL (Phase Locked Loop) in the NTSC conversion circuit 112 is locked, the MUSE-NTSC is used.
If the power supply of the conversion circuit 112 is cut off, it is impossible to determine whether the received signal is the MUSE signal or the NTSC signal.

Therefore, an object of the present invention is to solve the above-mentioned problems and to solve the problem even if the current television broadcasting by the NTSC signal is M.
An object of the present invention is to provide a television signal receiver which can receive even high-definition broadcasting by USE signals and has low power consumption.

[0009]

According to the present invention, a discriminating circuit for discriminating whether or not a television signal received by a satellite broadcast receiving device is an NTSC signal, and a MUSE-NTSC converting circuit according to the discriminating result. And a switch circuit that cuts off only the supply of power.

[0010]

When the satellite broadcast receiving device is receiving the high-definition broadcast, the discriminating circuit cannot discriminate that the signal is an NTSC signal, and as a result, the switch circuit does not operate and the converting circuit does not operate. The power is continuously supplied, and the conversion circuit is operated by the MU from the satellite broadcast receiving device.
High-definition broadcasting can be eventually received by converting the SE signal into the NTSC signal.

On the other hand, when the satellite broadcast receiving apparatus is receiving the current television broadcast, the determination circuit determines that the signal is an NTSC signal, and the switch circuit is operated according to the result, and it is necessary to operate during that period. Since no power is supplied to the conversion circuit, the NTSC directly output by the satellite broadcast receiving device does not consume unnecessary power.
It becomes possible to receive a signal.

[0012]

The present invention will be described below with reference to the illustrated embodiments. 1 is a block diagram showing a configuration of a television signal receiver according to a first embodiment of the present invention. In the figure, 101 is a U / V signal receiving antenna, 102 is a BS signal receiving antenna, 103 is a video input terminal, and 104 is U.
/ V antenna signal input terminal, 105 BS signal input terminal, 106 U / V tuner, 107 U / V signal detection circuit, 108 BS tuner, 109 BS signal detection circuit, 110 U / V signal processing Circuit, 111 is BS
A signal processing circuit, 112 is a MUSE-NTSC conversion circuit,
113 is a first signal switching circuit, 114 is a second signal switching circuit, 115 is a Y / C separation circuit, 116 is a color demodulation circuit,
Reference numeral 117 is a matrix circuit, 118 to 120 are cathode ray tubes, 122 is a power supply circuit, 123 is a control microcomputer,
124 is an AC power input terminal, 125 is a system power output terminal, 126 is a system control output terminal, 127
Is a MUSE-NTSC discriminating circuit, 128 is a recording output terminal, 131 is an NTSC discriminating circuit, and 132 is a switch circuit.

In this embodiment, an NTSC discriminating circuit 131 is newly added to the conventional television signal receiver shown in FIG.
The switch circuit 132 is added.

In this receiver, when the BS signal is received,
The output signal of the BS signal processing circuit 111 is MUSE-NT.
SC conversion circuit 112, first signal switching circuit 113, NT
Each is input to the SC determination circuit 131. The NTSC discriminating circuit 131 discriminates whether or not the signal currently being received is an NTSC signal. The determination of the NTSC signal can be made, for example, by whether or not the frame synchronization signal of the NTSC PCM (Pulse Code Modulation) audio signal in the BS signal processing circuit 111 is detected. Then, the determination result is input to the control microcomputer 123.

In the control microcomputer 123, the control signal based on the above discrimination result is input to the switch circuit 132 to control it. If the discrimination result is not the NTSC signal, the switch circuit 132 is closed, whereby the MUSE-NT.
Power is supplied from the power supply circuit 122 to the SC conversion circuit 112. Therefore, in this case, the output signal of the MUSE-NTSC conversion circuit 112 is also the first signal switching circuit 113.
Is input to. In the MUSE-NTSC discrimination circuit 127, the MUS in the MUSE-NTSC conversion circuit 112
The control microcomputer 12 determines whether or not the E-signal video or audio PLL is locked.
Input to 3. In the control microcomputer 123, the control signal based on the above determination result is sent to the system control output terminal 1
26, and controls the first signal switching circuit 113 to select the signal currently being received.

The output of the first signal switching circuit 113 is the second
Signal switching circuit 114. In the second signal switching circuit 114, a video signal input from the video input terminal 103 and a U signal output from the U / V signal processing circuit 110 are output.
/ V signal, and one of the signals output from the first signal switching circuit 113, by the control signal from the system control output terminal 126 according to the user's selection,
Select one of the signals to be displayed. The signal selected by the second signal switching circuit 114 is the Y / C separation circuit 115,
After passing through the color demodulation circuit 116 and the matrix circuit 117, R
A GB signal is input to the cathode ray tubes 118 to 120 and displayed. On the other hand, the first signal switching circuit 113
Is also output to the recording output terminal 128, and the VTR
(Not shown).

If the discrimination result in the NTSC discriminating circuit 131 is the NTSC signal, the switch circuit 132 is in the open state, and the MUSE-NTSC converting circuit 112 is not supplied with power. Control microcomputer 1
23, according to the discrimination result of the NTSC discrimination circuit 131,
The first signal switching circuit 113 is controlled to select the direct output signal from the BS signal processing circuit 111. Hereinafter, the operation subsequent to the second signal switching circuit 114 is the same as that when the determination result of the NTSC determination circuit 131 is not the NTSC signal.

As described above, in this embodiment, both the display signal and the recording signal are automatically discriminated whether they are the NTSC signal or the MUSE signal, and at the same time, the received signal is the NTSC signal. For a certain time, no power is supplied to the MUSE-NTSC conversion circuit 112 that does not need to operate during that time, and no wasted power is consumed.

FIG. 2 is a block diagram showing the configuration of a television signal receiving apparatus according to the second embodiment of the present invention. In FIG. 2, the same symbols are given to those equivalent to the first embodiment of FIG. It is attached. In FIG. 2, 301 is an ED (Extend
ed Definition) TV signal processing circuit, 302 aspect ratio conversion circuit, 303 switching circuit, 304 MUSE decoder, 305-307 output terminals for high-definition signal recording, 308 horizontal screen with aspect ratio "16: 9" Is a display device having.

In the configuration shown in FIG. 2, the input video signal from the video input terminal 103 and the U / V signal processing circuit 11
U / V signal output from 0 and BS signal processing circuit 1
The BS signals output from 11 are respectively input to the second signal switching circuit 114, and any one of the signals is selected and selected by the second signal switching circuit 114 in response to a selection command from the user, and the EDTV is selected. Signal processing circuit 301
Is input to The video input signal, the U / V signal, or the BS signal output from the second signal switching circuit 114 is a double speed baseband signal (525 scanning lines / 60 Hz frame frequency) in the EDTV signal processing circuit 301.
The signals are converted into Y, RY and BY signals, and the aspect ratio conversion circuit 302 converts the aspect ratio from “4: 3” to “16: 9”. On the other hand, MUSE decoder 30
In 4, the MUS output from the BS signal processing circuit 111
The E signal is converted into baseband signals (1125 scanning lines / frame frequency 30 Hz) Y, P _B and P _R signals.
Then, the output of the EDTV signal processing circuit 301 whose aspect ratio has been converted and the output of the MUSE decoder 304 are
It is switched by the switching circuit 303 and input to the display device 308 having a screen with an aspect ratio of “16: 9”.

Also in this embodiment, in the case of the current NTSC television broadcast in the receiving state of the BS broadcast, the NTSC discriminating circuit 131 discriminates this, so that the control microcomputer 123 switches according to the discriminating result. The circuit 132 is opened, the power supplied to the MUSE decoder 304 is cut off, and the switching circuit 303 is controlled to change the aspect ratio of the EDTV signal processing circuit 3.
01 output is selected and input to the display device 308. In addition, the decoded high-definition signal is output from the recording output terminals 305 to 307, and the high-definition VT is output.
It becomes possible to record with R. Therefore, also in this embodiment, the same effect as that of the first embodiment shown in FIG. 1 can be obtained.

[0022]

As described above, according to the present invention, it is possible to receive high-definition broadcasts, and when receiving the current NTSC television broadcasts, the MU
SE-NTSC conversion circuit (or MUSE decoder)
By not supplying power to the television signal receiver, a television signal receiver with low power consumption can be provided. Also,
It is possible to provide a television signal receiver that consumes less power during standby when recording an existing television broadcast program in an answering machine.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a television signal receiver according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a television signal receiver according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a television signal receiver according to a conventional technique.

[Explanation of symbols]

 101 U / V (UHF / VHF) signal receiving antenna 102 BS (video broadcasting) signal receiving antenna 103 Video input terminal 104 U / V antenna signal input terminal 105 BS antenna signal input terminal 106 U / V tuner 107 U / V signal detection Circuit 108 BS tuner 109 BS signal detection circuit 110 U / V signal processing circuit 111 BS signal processing circuit 112 MUSE-NTSC conversion circuit 113 First signal switching circuit 114 Second signal switching circuit 115 Y / C separation circuit 116 Color demodulation Circuit 117 Matrix circuit 118-120 Braun tube 122 Power supply circuit 123 Control microcomputer 124 AC power input terminal 125 System power output terminal 126 System control terminal 127 MUSE-NTSC discrimination circuit 128 Recording output terminal 131 NTSC Another circuit 132 switching circuit 301 EDTV signal processing circuit 302 the aspect ratio converting circuit 303 switching circuit 304 MUSE decoder 305-307 HDTV signal for recording the output terminal 308 display device

Claims (6)

[Claims] 1. A satellite broadcast receiving device and, when the signal received by the satellite broadcast receiving device is a high-definition signal, converts it from a signal format according to the transmission system such as MUSE transmission system to a signal format according to the NTSC system. Output from the satellite broadcasting receiver and the NTS from the satellite broadcasting receiver.
In a television signal receiver comprising at least a switching means for switching and outputting a direct output signal conforming to the C signal format and an output signal of the converter, the signal received by the satellite broadcast receiver is NTSC.
A television signal receiver, characterized in that it is provided with a determination means for determining whether or not it is a signal. 2. The power supply device according to claim 1, further comprising: a power supply device that simultaneously supplies power to the satellite broadcast receiving device and the conversion device; and a switch unit that shuts off only power supply to the conversion device. And a television signal receiver. 3. A satellite broadcast receiving device and, when the signal received by the satellite broadcast receiving device is a high-definition signal, converts it from a signal according to the transmission system such as MUSE transmission system to a baseband signal and outputs it. And a converter for converting the signal received by the satellite broadcast receiver into the NTSC signal receiver.
A television signal receiver, characterized in that it is provided with a determination means for determining whether or not it is a signal. 4. The power supply device according to claim 3, further comprising a power supply device for simultaneously supplying power to the satellite broadcast receiving device and the conversion device, and a switch means for shutting off only power supply to the conversion device. And a television signal receiver. 5. The satellite broadcast receiving device and, when the signal received by the satellite broadcast receiving device is a high-definition signal, converts the signal according to the transmission system such as the MUSE transmission system into a baseband signal and outputs the baseband signal. And a direct output signal conforming to the NTSC signal format from the satellite broadcasting receiver and a first conversion device for 525 scanning lines / double frequency baseband signal of field frequency 60 Hz (scanning line 5).
25 conversion lines / frame frequency 60 Hz) and output the second conversion device, and switching means for switching and outputting the output signal from the first conversion device and the output signal from the second conversion device. In a television signal receiver including at least, the signal received by the satellite broadcast receiving device is NTSC.
A television signal receiver, characterized in that it is provided with a determination means for determining whether or not it is a signal. 6. The power supply device for supplying power to the satellite broadcast receiving device and the first and second conversion devices at the same time, and the switch for cutting off power supply to the first conversion device according to claim 5. And a means for providing the television signal receiver.