JP2616611B2 - Satellite receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast receiver having a video and audio input terminal for inputting a video signal and an audio signal from a scramble decoder.

[0002]

2. Description of the Related Art In recent years, in satellite broadcasting, new broadcasting systems such as pay broadcasting by scrambling and high-definition broadcasting by the MUSE system have been used. And in order to receive these, besides the satellite broadcast receiver,
For scrambled pay broadcasting, scramble decoder, for MUSE high definition broadcasting, MUSE
A down converter is required. FIG. 3 shows a satellite broadcast receiver 101, a scramble decoder 102, and a MUSE
The connection of the down converter 103 is shown. From the satellite broadcast receiver 101 to the scramble decoder 102 or M
The detection output and the bit stream output are supplied to the USE down converter 103, and the AFC input and the video (video signal) / video from the scramble decoder 102 or the MUSE down converter 103 are supplied to the satellite broadcast receiver 101.
Audio (voice signal) input is performed.

Next, a conventional satellite broadcast receiver will be described with reference to FIG. In FIG. 2, a 12 GHz band radio wave transmitted from a broadcasting satellite is received by a parabolic antenna 1 and converted into a 1 GHz band BS-IF signal. This BS-IF signal is input to the BS front end 2 and is FM-demodulated to be a baseband signal. Then, the baseband signal is input to the video signal processing unit 4, where the baseband signal is subjected to de-emphasis, dispersal removal, etc., and is converted into a video signal. Further, the baseband signal output from the BS front end 2 is also input to the audio signal demodulation unit 3, where the QPSK demodulation process and the PCM demodulation process are performed. This signal is further converted by the audio signal processor 5 into D
Processing such as / A conversion and de-emphasis is performed, and converted into an audio signal.

Conventionally, the video output and the audio output of the scramble decoder have been connected to the external input terminal of the satellite broadcast receiver. However, when the connection is made in this way, when switching from normal satellite broadcast to pay broadcast, satellite broadcast reception is performed. The mode of the machine had to be switched from BS to external input, which was troublesome. Therefore, as shown in FIG. 2, a dedicated input terminal 8 for inputting the video output and the audio output of the scramble decoder.
And the configuration is as follows. That is, the audio signal demodulation unit 3 includes a circuit for detecting a pay bit included in the audio signal. The signal from this circuit selects a signal from the dedicated input terminal 8 during pay broadcasting, and selects a signal output from the video signal processing unit 4 and the audio signal processing unit 5 processed in the satellite broadcasting receiver during normal broadcasting. It is switched by the switch 7 and led to the BS selection output 6. When a MUSE down converter is connected to receive MUSE high-definition broadcasting,
Automatic switching is performed depending on the presence or absence of a keyed pulse.

[0005]

However, in the above-mentioned conventional satellite broadcast receiver, when a pay broadcast is received in a state where the scramble decoder is not connected to the dedicated input terminal 8, whether the scramble decoder is connected or not. Since it is impossible to determine whether or not the signal is being received, there is a problem that the selection switch 7 operates even when a signal is received, resulting in a non-input state.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention relates to a satellite broadcast receiving apparatus having a video and audio exclusive input terminal for inputting a video signal and an audio signal from a scramble decoder. And obtains a baseband signal from a signal transmitted from a satellite broadcast.
S front end, video signal processing means for converting the baseband signal into a video signal by de-emphasis processing, QPSK demodulation processing and PC
The audio signal demodulation means outputs the signal demodulated by the M signal, determines whether the signal is a pay broadcast, and outputs a pay broadcast discrimination signal during the pay broadcast. Audio signal processing means for performing conversion and de-emphasis processing to convert into an audio signal, a video signal and an audio signal from the scramble decoder,
A selection switch for switching and outputting a video signal and an audio signal output from the video signal processing means and the audio signal processing means, and determining whether a connector is connected to a video-only input terminal from the scramble decoder; Connection determination means for outputting a connection determination signal when connected, selecting a video signal and an audio signal from the scramble decoder only when both the connection determination signal and the pay determination signal are present; In the case of (1), the satellite is constituted by switch switching control means for switching and controlling the selection switch so as to select the video signal and the audio signal output from the video signal processing means and the audio signal processing means. A broadcast receiver is provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A satellite broadcast receiver according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing an embodiment of a satellite broadcast receiver according to the present invention. The same parts as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted. As shown in FIG. 1, the satellite broadcast receiver of the present invention has a switch 14 and a pull-up resistor 11 connected to the video-only input terminal 9 among the dedicated input terminals including the video-only input terminal 9 and the audio-only input terminal 10. And the terminating resistor 12 are connected. Further, an AND circuit 13 is newly added.

In FIG. 1, when a scramble decoder is connected to the dedicated input terminals 9 and 10 and a pay broadcast is received, the audio signal demodulation unit 3 detects a pay bit included in the audio signal as described above. When a pay broadcast is received, the input terminal a of the AND circuit 13 is set to H (high),
Otherwise, it is L (low). Further, the switch 14 connected to the video-only input terminal 9 is turned on when no pin jack (connector) is inserted into this terminal 9.
(Connection state), and the input terminal b of the AND circuit 13 becomes L by the pull-up resistor 11 of 10 kΩ and the terminating resistor 12 of 75 Ω. When a pin jack is inserted into the terminal 9, the switch 14 is turned off (disconnected state), and the input terminal b of the AND circuit 13 is set to H by the pull-up resistor 11. Here, the pull-up resistor 11 is 10 k
Although the resistance value is set to Ω, the resistance value of the pull-up resistor 11 is not limited to this, and may be a resistance value considerably larger than 75 Ω.

The selection switch 7 selects a scramble decoder signal input from the dedicated input terminals 9 and 10 when the output of the AND circuit 13 is H, and when L is L, a video signal processing section processed in the satellite broadcast receiver. 4 and the signal output from the audio signal processing unit 5 are selected and output to the BS selection output 6. As described above, when the scramble decoder is connected at the time of pay broadcast, the output thereof becomes H only when both the input terminals a and b of the AND circuit 13 are H, and the signals from the dedicated input terminals 9 and 10 are output to the BS selection output. 6 is output. When the scramble decoder is not connected, the output of the AND circuit 13 becomes L and the signals from the video signal processing unit 4 and the audio signal processing unit 5 are output to the BS selection output 6 irrespective of whether the broadcast is a pay broadcast or not. Therefore, no input state occurs.

[0010]

As described above in detail, since the satellite broadcast receiver of the present invention is constructed as described above, a pay broadcast is received without a scramble decoder being connected to the video and audio dedicated input terminals. In this case, it is possible to satisfactorily solve the problem that no signal is input despite receiving a signal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a satellite broadcast receiver of the present invention.

FIG. 2 is a block diagram showing a conventional satellite broadcast receiver.

FIG. 3 shows a satellite broadcast receiver, a scramble decoder and M
It is a figure for explaining connection with a USE down converter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Parabolic antenna 2 BS front end 3 Audio signal demodulation part 4 Video signal processing part 5 Audio signal processing part 6 BS selection output 7 Selection switch 9 Video-only input terminal 10 Audio-only input terminal 11 Pull-up resistor 12 Terminating resistor 13 AND circuit 14 switch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H04L 9/00 H04N 5/44 A 9/10 7/16 Z 9/12 H04L 9/00 Z H04N 5/44 7/16

Claims (1)

(57) [Claims] 1. A satellite broadcast receiver having a video and audio dedicated input terminal for inputting a video signal and an audio signal from a scramble decoder, wherein the BS front obtains a baseband signal from a signal transmitted from a satellite broadcast. An end; video signal processing means for de-emphasis-converting the baseband signal into a video signal; and QPSK demodulation processing and PCM demodulation processing for the baseband signal and outputting, and determining whether the broadcast is a pay broadcast. An audio signal demodulating means for outputting a pay broadcast discrimination signal at the time of pay broadcasting;
A / A conversion and de-emphasis processing to convert to an audio signal, an audio signal processing unit, a video signal and an audio signal from the scramble decoder, and a video signal and audio output from the video signal processing unit and the audio signal processing unit A selection switch that switches and outputs a signal, a connection determination unit that determines whether a connector is connected to a video-only input terminal from the scramble decoder, and outputs a connection determination signal if connected. Only when both the connection discrimination signal and the pay discrimination signal are present, the video signal and the audio signal from the scramble decoder are selected. Otherwise, the video signal and the audio signal are output from the video signal processing unit and the audio signal processing unit. Switch switching for switching and controlling the selection switch so as to select a video signal and an audio signal Satellite receiver characterized in that it is more configuration and control means.