JPH05218989A - Satellite scramble system - Google Patents

Abstract

PURPOSE:To reduce the cost of the system and to make the scale of the equipment installed to each room small. CONSTITUTION:A video/audio signal from a sender side studio 1 is scrambled by a scramble encoder 23 and a transmission station 5 sends the signal to a satellite 6. An antenna 8 at a receiver side receives a transmission signal 7 from the satellite, a receiver 10 demodulates the scrambled video audio signal from an output signal of a frequency converter 9, and a scramble decoder 24 decodes the original video audio signal. The signal is fed to television receivers 17, 18 placed to each room through a modulator 14, a mixer 15 and a distributer 16. When viewing of the television receiver 17 is stopped, a scramble controller 4 makes operation to allow a signal generating section 3 to generate a control signal. The signal is detected by a signal detection section 12 at the receiver side and outputs an external device control signal 13. Thus, the television receiver 17 stops the display of the video image and sounding of the audio signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite scramble system which scrambles video / audio signals for distribution.

[0002]

2. Description of the Related Art Conventionally, in a small-scale joint television receiving system, there are, for example, two rooms, and if one program can be viewed in one room and the other cannot be viewed depending on its content, the following two rooms are available. The method was adopted.

First, a system based on the first method will be described with reference to FIG. On the transmitting station side, the scramble encoder 2 scrambles the video / audio signals from the studio 1 for concealment. Then, the scrambled video / audio signal is transmitted from the transmitting station 5 to the satellite 6. On the other hand, on the receiving side, the antenna 8 receives the transmission signal 7 from the satellite, and the low noise frequency converter 9
Performs frequency conversion on the received signal, further amplifies and outputs. The mixer 15 synthesizes the output signal of the frequency converter 9 and the UHF / VHF signal 19 and outputs the combined signal to the distributor 16. The distributor 16 distributes the signal from the mixer 15 to the receivers 10a and 10b through the cable,
a and 10b are scrambled images.
Demodulate the audio signal. Scramble decoder 11a, 1
1b receives signals from the receivers 10a and 10b, respectively, and restores the original video / audio signals from the scrambled video / audio signals. Televisions 18a and 18b installed in the rooms A and B, respectively, display an image and generate an audio based on the restored video / audio signals from the decoders 11a and 11b. In such a system, for example, in the television 18a installed in the room A, when the program broadcast from the studio 1 cannot be viewed, the scramble controller 4 on the transmission side is operated to operate the scramble encoder 2
To send a command to the scramble decoder 11a through
The viewing of the above program on the television 18a was prohibited.

Next, a system based on the second method will be described with reference to FIG. The transmitting side transmits the scrambled video / audio signals to the satellite 6 as in the case of the system of FIG. Then, on the receiving side, the antenna 8 receives the transmission signal 7 from the satellite, and the low noise frequency converter 9 frequency-converts the reception signal, further amplifies and outputs it. The receiver 10 demodulates the scrambled video / audio signal from the output signal of the frequency converter 9, and the scramble decoder 11 restores the original video / audio signal from the output signal. After that, the co-listening scramble encoder 20 scrambles the video / audio signals restored by the decoder 11. The modulator 14 modulates the video / audio signal, and the mixer 15 outputs the output signal of the modulator 14 and the UHF / VHF signal 19
And are mixed and output to the distributor 16. And distributor 1
6 distributes the signal from the mixer 15 to the co-listening scramble decoders 22a and 22b through a cable, and the decoders 22a and 22b respectively decode the scrambled video / audio signals from the distributor.・
Restore the audio signal. The televisions 18a and 18b installed in the rooms A and B are decoders 22 respectively.
Based on the restored video / audio signals from a and 22b, a video is displayed and a sound is generated. In such a system, for example, in the television 18a installed in the room A, when the program broadcast from the studio 1 cannot be viewed, the scramble controller 2 is used.
1 is operated, and a command is issued to the scramble decoder 22a through the scramble encoder 20 to prohibit viewing of the program on the television 18a.

[0005]

However, the above-mentioned first problem
In the above method, the receivers 10a and 10b and the scramble decoders 11a and 11b must be provided for each room, resulting in a problem that the cost is high and the size of the device installed in each room is large. .. Further, the second method requires a scrambling system for co-listening, resulting in a high cost, and also a labor cost for operating the scrambling system for co-listening.

An object of the present invention is to solve the above problems and to provide a satellite scramble system which is low in cost and has a small scale of equipment to be installed in each room.

[0007]

The present invention provides a scramble encoder on the transmitting side in a satellite scramble system that scrambles video / audio signals for distribution.
A signal generator that generates a predetermined control signal is provided, and a scramble decoder on the receiving side includes a signal detector that detects the control signal and outputs an external device control signal.
It is characterized by comprising a television whose viewing is controlled by the external device control signal output from the signal detection unit.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows an example of a satellite scramble system according to the present invention. The transmitting side of this system is different from the transmitting side of FIG. 2 in that, under the control of the scramble controller 4, the scramble encoder 21 has a control signal generating section 3 for generating a control signal for disabling viewing on the receiving side. That is the point.

On the other hand, the scramble decoder 24 on the receiving side
Includes a control signal detector 12 that receives a signal from the receiver 10, detects the control signal, and outputs an external device control signal 13. When the television 17 installed in the room A receives the control signal 13 from the detection unit 12 through a predetermined wiring, even if the video / audio signal is supplied from the distributor 16, the television 17 displays the video and outputs the audio. It does not occur.

Next, the operation will be described. First, on the sending side,
The scramble encoder 23 receives the video / audio signals from the studio 1 and scrambles them for concealment. Then, the transmitting station 5 transmits the scrambled video / audio signal to the satellite 6.

On the other hand, on the receiving side, the antenna 8 receives the transmission signal 7 from the satellite, and the low noise frequency converter 9 frequency-converts the reception signal, further amplifies and outputs it. The receiver 10 demodulates the scrambled video / audio signal from the output signal of the frequency converter 9, and the scramble decoder 24 restores the original video / audio signal from the output signal. The modulator 14 is the restored image.
The audio signal is modulated, and the mixer 15 mixes the output signal of the modulator 14 and the UHF / VHF signal 19 and outputs the mixed signal to the distributor 16. Then, the distributor 16 outputs the signal from the mixer 15 to the televisions 17 and 18 installed in the rooms A and B through the cables. Television 17,1
The reference numeral 8 projects a video image based on the video / audio signal restored from the distributor 16 to generate a sound.

In this system, in the television 17 installed in the room A, when the program broadcast from the studio 1 cannot be viewed, the scramble controller 4 is operated to send a control signal to the signal generator 3. Generate. This signal is transmitted to the receiving side through the satellite 6, and on the receiving side, the signal detection unit 12 detects it and outputs the external device control signal 13. As a result, the television 17 stops displaying the video and generating the sound of the program.

[0013]

As described above, according to the present invention, in the satellite scramble system for scrambling and distributing the video / audio signal, the scramble encoder on the transmission side is provided with the signal generating section for generating a predetermined control signal, The scramble decoder on the receiving side is provided with a signal detection unit that detects a control signal and outputs an external device control signal.
It is characterized by comprising a television whose viewing is controlled by an external device control signal output from the signal detection unit. Then, in order to prevent viewing on the television, it is sufficient to generate a control signal in the signal generation unit on the transmission side, and at that time, the signal detection unit on the reception side detects the control signal and detects the external device control signal. As a result, the television stops displaying video and generating audio.

The satellite scramble system of the present invention does not require a receiver and a scramble decoder for each room, nor does a scramble system for co-listening. Therefore, the device that can perform the concealment process at low cost and that should be installed in each room is small.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of a satellite scramble system according to the present invention.

FIG. 2 is a block diagram showing an example of a conventional satellite scramble system.

FIG. 3 is a block diagram showing another example of a conventional satellite scramble system.

[Explanation of symbols]

 1 Studio 3 Control Signal Generator 4 Scramble Controller 5 Transmitter 6 Satellite 8 Reception Antenna 9 Low Noise Frequency Converter 10 Receiver 12 Control Signal Detector 14 Modulator 16 Distributor 17, 18 Television 23 Scramble Encoder 24 Scramble Decoder

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location // H04N 7/20 8943-5C

Claims (1)

[Claims] 1. A satellite scramble system that scrambles a video / audio signal for distribution, wherein a scramble encoder on the transmission side is provided with a signal generation section for generating a predetermined control signal, and a scramble decoder on the reception side performs the control. A satellite characterized in that it is provided with a signal detection unit that detects a signal and outputs an external device control signal, and that the receiving side is provided with a television whose viewing is controlled by the external device control signal output by the signal detection unit. Scramble system.