JPH065280U - Satellite receiver - Google Patents

Abstract

(57) [Abstract] [Purpose] In a satellite receiving device, a scramble bit detecting means stably performs a detecting operation depending on a voice transmission mode state when receiving a scrambled broadcast. [Structure] The demodulated signal from the channel selection demodulator 3 is taken out by a video signal processor 4 and a 4-phase DPSK demodulator 6 and a PC
An audio signal is taken out by the M decoder unit 7, DF, DA unit 8 and audio signal processing unit 9. The data including the scramble information is output from the PCM decoder unit 7, the output of the scramble bit detection unit 10 and the voice transmission mode from the PCM decoder unit 7 are input to the operation units 15 and 16, and the scramble bit is detected. [Effect] The scramble bit detection malfunction caused by the audio B mode is eliminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a satellite receiver, and more particularly to information output control for scrambled independent audio in audio B mode.

[0002]

[Prior art]

 With the launch of the broadcasting satellite BS-3a, in addition to NHK2 channels, Japan Satellite Broadcasting Co., Ltd. (JSB) has started paying broadcasting by scrambling, and satellite digital music broadcasting (SDAB) broadcasting has also started. , Satellite broadcasting is becoming multi-channel. However, JSB uses COATEC (COndEC (COnditional Access TEChnology) Laboratories Co., Ltd.) scramble as a pay method, and a scramble decoder is required to receive the scramble, but with the program provider. You can watch the satellite broadcast of the desired channel by connecting the scramble decoder to the satellite receiver you have after making the contract for the reception and paying the regular reception fee.

FIG. 2 shows a configuration example of a conventional satellite receiver 21. The satellite radio waves captured by the satellite antenna 1 are converted into an intermediate frequency of 1 GHz band by the converter 2 and sent to the satellite receiver 21. First, the channel selection demodulator 3 performs FM demodulation on a reception channel selected and a baseband signal of a video signal on which an energy spread signal is superimposed and an audio subcarrier are output. The demodulation output of the channel selection demodulation unit 3 is supplied to the video signal processing unit 4 and subjected to video processing (de-emphasis, LPF (low-pass filter circuit), energy spread signal removal, amplification) to extract the video signal. On the other hand, the demodulation output from the channel selection demodulation unit 3 is applied to a BPF (band-pass filter circuit) 5 to extract a four-phase DPSK-modulated audio subcarrier signal, and the subsequent four-phase DPSK demodulation unit 6 outputs the audio. The PCM subcarrier signal is demodulated into a digital signal of a PCM code string. Further, it is sent to the PCM decoder section 7, where it undergoes PCM data processing (descramble, deinterleave, error correction, etc.). The first output of the PCM data from the PCM decoder unit 7 is converted into an analog signal in the digital filter / DA converter unit 8 (hereinafter, DF, DA unit) and then de-emphasised in the audio signal processing unit 9. , Amplified and voice output. The above is the configuration of the satellite receiving means 22.

Then, the second output of the PCM data from the PCM decoder unit 7 is input to the scramble bit detection unit 10 and the 1-bit scramble bit and the range bit for the video included in the control code in the PCM data. The scramble bit included in each audio channel, which is provided for each audio channel, is detected, and the output is supplied to a scramble presence / absence display circuit (not shown) or the like to scramble the video signal and each audio signal. Control related to the presence / absence of scrambling of the video signal and each audio signal such as the presence / absence display is performed.

[0005]

[Problems to be solved by the device]

 In the conventional satellite receiver, the scramble bit detection unit 10 performs a detection operation for each reception channel, but the scramble bit detection unit 10 detects the scramble bit for voice from the PCM decoder unit 7. The range bits vary depending on the signal multiplexing structure of the voice mode on the transmitting side. In the voice A mode, 4 bits for 4 channels (television voice 2 bits, independent voice 2 bits), voice B mode are used. At the time of 2 channels of 2 bits (2 bits of TV audio), in the audio B mode, the remaining 2 bits (independent audio) in the scramble bit detection section 10 will cause the scramble bit detection to cause a malfunction state. There was a problem that the display of whether or not scrambled independent voices became unstable.

[0006]

[Means for Solving the Problems]

 The present invention solves the above-mentioned problems, and transmits a video signal, a voice signal, and a voice by receiving a radio wave coming from a satellite by a satellite antenna and receiving a signal whose frequency is converted to an intermediate frequency signal by a converter. A satellite receiving means for demodulating a signal including a mode signal and an audio PCM signal, and a scramble bit of the audio PCM signal is detected to determine whether or not the video signal and each audio signal are scrambled to scramble the video signal and each audio signal. In a satellite receiving device having a scramble bit detecting means for outputting presence / absence information, in the scramble bit detecting means, information on whether or not scramble of independent voice is output and the transmission mode signal of the voice are inputted, and the transmission mode signal is inputted. If it is a B-mode detection signal, the information output whether or not the independent audio is scrambled is output without scrambling. It is characterized in that it comprises a control means for fixing to the force.

[0007]

[Action]

 The present invention detects the presence or absence of scrambling of the independent audio video signal and each audio signal obtained from the independent audio scramble bit by detecting the audio B mode of the audio transmission mode signal (A, B mode) demodulated by the satellite receiving means. The information of is output without scramble.

[0008]

【Example】

 FIG. 1 shows a block diagram of an embodiment of the present invention.

In the satellite receiving apparatus 31 shown in FIG. 1, the satellite receiving means 32 has the same operation as the configuration of the conventional example shown in FIG. 2, and a description of common parts will be omitted. The output of the PCM data from the PCM decoder unit 7 is input to the scramble bit detection unit 10 to obtain the scramble bit of the video signal included in the control code in the PCM data and the audio signal included in the range bit in the PCM data. A scramble bit detection unit 10 for detecting scramble bits outputs information as to whether or not the video signal and each audio signal are scrambled. The scramble bit can detect 5 bits of video, audio 1, audio 2, audio 3, audio 4 in audio A mode, but in B mode, the audio transmission system is only TV audio. In the scramble bit detection, there are 3 bits of video, audio 1 and audio 2, and the scramble bit detection unit 10 outputs audio 3, audio 4 (independent audio) video signals and audio signals. The information output whether scrambled or not depends on the transmission system such as the data structure of the signal multiplex in the audio B mode, and is fixed at one of the “H” level and the “L” level, or fluctuates between both levels. Or Then, there is displayed a scrambled voice 3 and voice 4 which should not be present in the voice B mode. Therefore, the scrambling bit detection output is blocked by the arithmetic units 15 and 16 on the condition that the voice B mode detection output from the PCM decoder unit 7 is set as a condition. In this case, the audio mode output from the PCM decoder section 7 is set to the "H" level in the A mode and the "L" level in the B mode, and the scramble bit detection output is set to the "H" level when scrambled. Level, without scrambling If it is set to "L" level, in the arithmetic units 15 and 16, in the voice A mode, it is output from the arithmetic units 15 and 16 according to the output of the scramble bit detection unit, and the voice B mode. At times, the outputs of the arithmetic units 15 and 16, that is, the output of the scramble bit detecting unit on the independent voice side are fixed to the "L" level to stabilize the scramble bits.

In the above embodiment, the satellite receiver 31 is a satellite broadcast receiving device that receives satellite broadcasts, but it may be incorporated in a television receiver or a video tape recorder, and communication may be performed. It can also be applied to CS receivers that receive radio waves from satellites.

[0011]

[Effect of device]

 As described above, according to the present invention, the scramble information included in the radio wave from the satellite is prevented by the detection means in the voice B mode to prevent the malfunction and the unstable operation due to the scramble bit detection of the independent voice which should not exist originally. It is the one.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of a conventional example.

[Explanation of symbols]

1 satellite antenna 2 converter 3 channel selection demodulation unit 4 video signal processing unit 5 band filtering circuit 6 4-phase DPSK demodulation unit 7 PCM decoder unit 8 DF, DA unit 9 audio signal processing unit 10 scramble bit detection unit ( Scramble bit detection means) 11 control means 15 arithmetic unit (AND) 16 arithmetic unit (AND) 21, 31 satellite receiver 22, 32 satellite receiver

Claims (1)

[Scope of utility model registration request] 1. A signal including a video signal, an audio signal, an audio transmission mode signal, and an audio PCM signal, which receives a radio wave coming from a satellite by a satellite antenna and receives a signal whose frequency is converted into an intermediate frequency signal by a converter. And a scramble bit detecting means for detecting scramble bits of the audio PCM signal, determining whether or not the video signal and each audio signal are scrambled, and outputting information on the presence or absence of scramble of the video signal and each audio signal. In the satellite receiving device having: a scramble bit detecting means, the information output of scramble presence / absence of independent voice and the transmission mode signal of the voice are input, and the independent voice of the independent voice is transmitted when the transmission mode signal is the B mode detection signal. Control means is provided for fixing the information output with or without scramble to the output without scramble. Satellite receiver characterized and.