JPH05153597A - Satellite broadcast receiver - Google Patents

Abstract

PURPOSE:To enjoy a JSB broadcast without changing connection by connecting plural satellite broadcast receivers to one set of JSB decoder. CONSTITUTION:A satellite broadcast receiver 2 is provided with input terminals 25, 26 for a bit stream signal and a detection signal from other satellite broadcast receiver 3 and outputs the bit stream signal and the detection signal from the satellite broadcast receiver 2 to a JSB decoder 4 only when the satellite broadcast receiver 2 receives a JSB broadcast. When the satellite broadcast receiver 2 does not receive a JSB broadcast, the bit stream signal and the detection signal from the other satellite broadcast receiver 3 are fed to a JSB decoder via the satellite broadcast receiver 2 and an output signal of the JSB decoder is connected to the satellite broadcast receiver 2 and the other satellite broadcast receiver 3 respectively in a way of outputting a signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast receiving device such as a VTR or a TV receiver having a BS (satellite broadcast) receiving function, and more particularly to a video signal and an audio signal from a scrambled satellite broadcast signal. The present invention relates to a satellite broadcast receiving device that can be connected to a dedicated decoder device in order to obtain.

[0002]

2. Description of the Related Art In ordinary satellite broadcasting, a video signal and an audio signal can be obtained by demodulating a signal received from a BS antenna (satellite broadcasting receiving antenna) and converting it as it is. However, JSB (Japan Satellite Brodecate) broadcasting, which started broadcasting in April 1991,
Broadcasting is scrambled and it is not possible to obtain decent video and audio signals if converted directly. In order to properly receive this JSB broadcast, JSB
A device called a decoder for descrambling is provided from Japan Satellite Broadcasting Co., Ltd. for a fee. This JSB decoder has input ends of a bit stream signal and a detection signal, and a bit stream signal is a signal converted into a scrambled digital audio signal, and a detection signal is still video and audio. The signals in the unconverted state are input respectively. JSB
The decoder appropriately converts these signals and outputs a video signal and an audio signal.

On the other hand, a recent satellite broadcasting receiving apparatus is, for example, "Audio Video"; December 1990, No. 100.
As described on pages 101 to 101, the JSB decoder has been equipped with a function for outputting the above-mentioned detection signal and bit stream signal.

[0004]

If there are two or three satellite broadcasting receivers in a family and only one JSB decoder is contracted with Japan Satellite Broadcasting Co., Ltd., 1 It is possible to connect a JSB decoder to one satellite broadcast receiving device and receive the JSB broadcast only with this satellite broadcast receiving device. However, with other satellite broadcasting receivers, JSB
If you want to receive a broadcast, you have to reconnect the JSB decoder or contract another JSB decoder. Therefore, in the former case, the work of reconnecting is troublesome for the user, and in the latter case, the burden is too heavy in terms of economy.

The present invention has been made in view of the above points,
The purpose is to have one JSB decoder and multiple satellite broadcasting receivers (eg VTR and TV).
In addition to making it possible to receive JSB broadcasting,
An object of the present invention is to provide a highly convenient device that does not require a change in connection with the JSB decoder.

[0006]

In order to achieve the above-mentioned object, the satellite broadcast receiving apparatus according to the present invention has means for receiving a satellite broadcast signal from a satellite broadcast receiving antenna, demodulating it into a video signal and an audio signal, and scrambling. Means for outputting a bit stream signal and a detection signal to a dedicated decoder device for obtaining a video signal and an audio signal from the applied satellite broadcast signal; and means for inputting the video signal and the audio signal from the dedicated decoder device. First switching means for selectively selecting one of the video signal and audio signal from the dedicated decoder device and the video signal and audio signal demodulated by the demodulating means, and another satellite broadcast Means for inputting the bit stream signal and the detection signal from the receiving device, and the bit stream signal and the detection signal from the other satellite broadcasting receiving device A bit stream signal and a second for output alternatively to the dedicated decoder device any one of a detection signal from the inside of the satellite broadcasting receiver
And switching means of.

[0007]

[Operation] One satellite broadcasting receiver (for example, VTR),
An input terminal for a bit stream signal and a detection signal from another satellite broadcast receiving device (for example, TV) is provided, and when this satellite broadcast receiving device (VTR) itself does not receive the JSB broadcast, the other satellite broadcast receiving device The bit stream signal and the detection signal input from (TV) are switched to be output to the JSB decoder. Further, the output signal of the JSB decoder is output to the present satellite broadcast receiving device and another satellite broadcast receiving device, respectively. By doing so, even in a satellite broadcast receiver in which the output ends of the bitstream signal and the detection signal are not directly connected to the JSB decoder, it is possible to receive and enjoy the JSB broadcast without changing the connection.

[0008]

The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a block diagram of a system using a satellite broadcast receiving apparatus according to an embodiment of the present invention. In the figure,
Reference numeral 1 is a BS antenna, 2 is a first satellite broadcasting receiving device according to the present invention connected to the BS antenna 1 (for example, a VTR having a satellite broadcasting receiving function), and 3 is a second satellite also connected to the BS antenna 1. It is a broadcast receiving device (for example, a TV having a satellite broadcast receiving function). Reference numeral 4 denotes a JSB decoder for descrambling the scrambled JSB broadcast signal to obtain a video signal and an audio signal. The JSB decoder 4 has a signal (detection signal and bit stream signal) input terminal from the satellite broadcast receiving device and a satellite. And a signal (video signal and audio signal) output terminal to the broadcast receiving device.

The first satellite broadcast receiving apparatus (VTR) 2 according to the present invention comprises a demodulator 11, an audio demodulator 12, a video signal demodulator 13, a digital audio demodulator 14, and a control means 1.
5, input signal determination means 16, first switching means 17, second switching means 18, external video output terminal 19, external audio signal output terminal 20, detection signal output terminal 21 to the JSB decoder 4, Bit stream signal output terminal 22 to the JSB decoder 4, video signal input terminal 23 from the JSB decoder 4, audio signal input terminal 24 from the JSB decoder 4, detection signal input terminal 25 from the outside, bit stream signal input from the outside The terminal 26 and the like are provided. In this embodiment, the detection signal output terminal 21,
The bit stream signal output terminals 22 are respectively connected to the corresponding signal input terminals of the JSB decoder 4, and the detection signal input terminal 25 and the bit stream signal input terminal 26 are connected to the second satellite broadcast receiving apparatus (TV) 3 Side detection signal output terminal and bit stream signal output terminal. Further, the signal output end (output end of the video signal and the audio signal) of the JSB decoder 4 is the video signal input terminal 23, the audio signal input terminal 24 of the first satellite broadcast receiver (VTR) 2, and the second satellite. They are connected to the video signal input terminal and the audio signal input terminal of the broadcast receiving apparatus (TV) 3, respectively.

In the above configuration, the satellite broadcast signal received from the BS antenna 1 is input to the demodulator 11 of the first satellite broadcast receiving apparatus 2 in the 1 GHz band (IF signal) and is PLL detected by the demodulator 11. Demodulated to a state in which the video signal and the audio PCM subcarrier are mixed.
The audio PCM subcarrier output from the demodulator 11 is demodulated by the audio demodulator 12 into PCM audio. If the received satellite broadcast signal is scrambled JSB broadcast, a signal in a state in which the video signal output from the demodulator 11 and the audio PCM subcarrier are mixed is used as the detection signal S1. The switching means 18 and the detection signal output terminal 21 output to the JSB decoder 4 and the PCM audio signal output from the audio demodulator 12 is used as the bit stream signal S2. J via output terminal 22
It is output to the SB decoder 4. On the other hand, when the received satellite broadcast signal is a normal (non-scrambled) satellite broadcast, the output of the demodulator 11 is input to the video signal demodulator 13 and converted into a video signal, It is possible to output to the second satellite broadcast receiver (TV) 3 via the first switching means 17 and the video output terminal 19, and
The output of the audio demodulator 12 is converted into an audio signal by the digital audio demodulator 14 and can be output to the second satellite broadcast receiving apparatus (TV) 3 via the first switching means 17 and the audio signal output terminal 20. It is said that.

In this embodiment, the satellite signal received by the first satellite broadcast receiving apparatus 2 from the BS antenna 1 is scrambled by the input signal determining means 16 as a normal satellite broadcast signal. It is determined whether the broadcast is a JSB broadcast, and the control means 15 is operated according to the determination result.
However, the first switching means 17 and the second switching means 18
The switching status is automatically interlocked to control switching. That is, when the satellite broadcast signal received by the first satellite broadcast receiving device 2 is a signal scrambled by the code included in the JSB broadcast, the first switching means 17 and the first switching means 17 The second switching means 18 takes the switching state shown in FIG. 1, and the second switching means 18 sends the detection signal S1 of the first satellite broadcast receiver (VTR) 2 itself and the bit stream signal S2 to the JSB decoder 4. In addition, the first switching means 17 outputs the video signal and the audio signal from the JSB decoder 4 to the second satellite broadcast receiving device (TV) 3. On the other hand, the first satellite broadcast receiver (VTR) 2
If the received satellite signal is a normal satellite broadcast signal, or if the first satellite broadcast receiving apparatus 2 is not receiving a broadcast, the first switching means 17 and the second switching means 18 Shows a switching state opposite to that of FIG. 1, and the second switching means 18 detects the detection signal S1 and the bit stream signal S2 input from the second satellite broadcast receiving apparatus (TV) 3.
Is output to the JSB decoder 4, and the first switching means 17 outputs the video signal and the audio signal generated by the first satellite broadcast receiver (VTR) 2 itself to the second satellite. The broadcast receiving apparatus (TV) 3 is placed in a state where it can be output. The setting for JSB broadcasting is currently BS3C.
Since it is H, the first satellite broadcast receiving device (VT
When the BS3CH is received by R) 2, the first switching means 17
In addition, the second switching means 18 may be switched to the state shown in FIG.

Now, the first satellite broadcast receiver (VTR)
2 receives the JSB broadcast, the first switching means 17 and the second switching means 18 take the switching state shown in FIG. 1, and the first satellite broadcast receiving apparatus (VTR) 2
The own detection signal S1 and the bit stream signal S2 are JS
The video signal and the audio signal output to the B decoder 4 and descrambled by the JSB decoder 4 are generated by the video signal input terminal 23 and the audio signal input terminal 24.
-> First switching means 17-> output to the second satellite broadcast receiving device (TV) 3 via the video signal output terminal 19 and the audio signal output terminal 20, and the second satellite broadcast receiving device (T)
V) Can be monitored on 3. Further, the video signal and the audio signal from the JSB decoder 4 are supplied to a recording system circuit in the first satellite broadcast receiving apparatus (VTR) 2 as needed so that they can be recorded.

When the first satellite broadcast receiving apparatus 2 is receiving a normal satellite broadcast signal, the first switching means 17 is used.
In addition, the second switching means 18 is in the switching state opposite to that of FIG. 1, and when the second satellite broadcast receiving apparatus (TV) 3 side is not in the receiving state at this time, the first satellite broadcast receiving apparatus (VTR) 2 The video signal and the audio signal demodulated and generated therein are output to the second satellite broadcast receiving apparatus (TV) 3 via the first switching means 17 → the video signal output terminal 19 and the audio signal output terminal 20. The video signal and the audio signal which can be monitored and which are generated by the first satellite broadcast receiving device (VTR) 2 are transmitted by the first satellite broadcast receiving device (VTR) 2
If necessary, it is supplied to a recording system circuit so that it can be recorded.

When the first satellite broadcast receiving device (VTR) 2 is receiving a normal satellite broadcast signal, or when the first satellite broadcast receiving device 2 is not receiving a broadcast, The second satellite broadcast receiver (TV) 3 is the BS.
When receiving a JSB broadcast from the antenna 1 (also in this case, the first switching means 17 and the second switching means 18 are in the switching states opposite to those in FIG. 1), the second satellite broadcast receiving apparatus. The detection signal S1 and the bit stream signal S2 from the (TV) 3 are detected by the detection signal input terminal 25,
The signal is output to the JSB decoder 4 via the bit stream signal input terminal 26, the second switching means 18, the detection signal output terminal 21 and the bit stream signal output terminal 22. Then, the video signal and the audio signal generated by descrambling by the JSB decoder 4 are sent to the second satellite broadcast receiving apparatus (TV) 3 and then on the second satellite broadcast receiving apparatus (TV) 3. Output as image and sound.
At this time, the first satellite broadcast receiving device (VT
R) 2 does not output a signal from the first switching means 17 to the second satellite broadcast receiving apparatus (TV) 3, or the second satellite broadcast receiving apparatus (TV) 3 has the first satellite. The output from the broadcast receiving device (VTR) 2 is not accepted.

As described above, in the present embodiment, when the first satellite broadcast receiving device (VTR) 2 can receive the JSB broadcast as well as when it is not receiving it, the second satellite broadcast receiving device (TV) 3 The JSB decoder 4 demodulates the signal according to the bit stream signal or the detection signal output by the above and outputs it to the second satellite broadcast receiving apparatus (TV) 3, so that the second satellite broadcast receiving apparatus (TV) 3 also receives the JSB broadcast. You can do it. That is, the first satellite broadcast receiver (VTR) 2 can be used without changing the connection with the JSB decoder 4.
When the JSB broadcast is not received, the second satellite broadcast receiving device (TV) 3 can also receive and monitor the JSB broadcast.

FIG. 2 shows another embodiment of the present invention. In this embodiment, as shown in FIG.
More than one satellite broadcasting receiver is connected.
In this embodiment, the internal configurations of the second satellite broadcast receiving apparatus 3 and the third satellite broadcast receiving apparatus 5 are the same as those of the first satellite broadcast receiving apparatus 2, and the third satellite broadcast receiving apparatus is used. The detection output and the bit stream output of the device 5 are output to the second satellite broadcast receiving device 3, and the output of the JSB decoder 4 is also output to the third satellite broadcast receiving device 5. Although not shown, the detection output and the bit stream output of the fourth satellite broadcast receiving device are output to the third satellite broadcast receiving device 5, and the output of the JSB decoder 4 is output to the fourth output.
It is also designed to be output to the satellite broadcasting receiving device. By connecting in this way, it becomes possible to selectively receive the JSB broadcast by any one of the satellite broadcast receiving devices.

[0017]

As described above, according to the present invention, one J
In the SB decoder, a plurality of satellite broadcast receiving devices (for example,
VSB and TV etc.) can receive JSB broadcasting alternatively, and a highly convenient system that does not require a change in connection with the JSB decoder can be constructed, and its value is great.

[Brief description of drawings]

FIG. 1 is a block diagram of a system using a satellite broadcast receiving apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a connection relationship when three or more satellite broadcast receiving devices are connected to one JSB decoder according to another embodiment of the present invention.

[Explanation of symbols]

 1 BS Antenna 2 1st Satellite Broadcasting Receiver (VTR) 3 2nd Satellite Broadcasting Receiver (TV) 4 JSB Decoder 5 3rd Satellite Broadcasting Receiver 11 Demodulator 12 Audio Demodulator 13 Video Signal Demodulator 14 Digital Audio demodulator 15 Control means 16 Input signal determination means 17 First switching means 18 Second switching means 19 Video signal output terminal 20 Audio signal output terminal 21 Detection signal output terminal 22 Bit stream signal output terminal 23 Video signal input terminal 24 Audio signal input terminal 25 Detection signal input terminal 26 Bit stream signal input terminal

Claims (3)

[Claims] 1. A means for receiving a satellite broadcast signal from a satellite broadcast receiving antenna and demodulating it into a video signal and an audio signal, and a decoder device dedicated for obtaining the video signal and the audio signal from the scrambled satellite broadcast signal. Means for outputting the bit stream signal and the detection signal, means for inputting the video signal and the audio signal from the dedicated decoder device, the video signal and the audio signal from the dedicated decoder device, and the demodulation means First switching means for selectively selecting one of the video signal and the audio signal, a means for inputting a bit stream signal and a detection signal from another satellite broadcast receiving device, and another satellite Bit stream signal and detection signal from the broadcast receiving device, and bit stream signal and detection signal from inside the satellite receiving device Satellite broadcast receiving apparatus characterized by comprising a second switching means for outputting alternatively to the dedicated decoder device either. 2. The satellite broadcast receiving apparatus according to claim 1, wherein the first switching means and the second switching means are interlocked to perform switching control. 3. The first switching means and the second switching means according to claim 2, depending on whether the satellite broadcast receiver itself receives the scrambled satellite broadcast signal. A satellite broadcast receiving device characterized by automatically switching control.