JPH06217324A - Tv viewing system - Google Patents

Abstract

PURPOSE:To allow the user to view a BS broadcast, a CS broadcast and a ground broadcast by sending and distributing a television signal obtained by RF converting an input television signal whose scrambling is descrambled to each room and allowing a television receiver of each room to select a channel. CONSTITUTION:A BS (or CS) tuner 2 selects a subscription broadcast channel and outputs an FM detection signal and a bit stream signal. A descrambler 3 descrambles the FM detection signal and generates and outputs a video signal and an audio signal. An RF converter 4 superimposes RF television signals with each other obtained by converting the said signals to a prescribed RF band. An RF television signal, a U/V television signal and a BS-IF signal are sent to each room via transmission means such as a 1st mixer 5, a 2nd mixer 7, an amplifier distributer 8 and a branching device 9 or the like. Each room uses a 2nd BS tuner 10 and a television receiver provided with a video input to allow the user to view the subscription broadcast whose scrambling is descrambled, other BS broadcast and ground broadcast.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TV viewing system in which a scrambled TV signal is decoded and then RF-converted, and the RF TV signal is transmitted and distributed to each TV.

[0002]

2. Description of the Related Art FIG. 2 is a block diagram of a TV viewing system for watching a conventional BS pay broadcast. 20 is BS-
IF signal 27 and terrestrial UHF / VHF (U / V) television signal 28 are input, mixed and amplified, and then a plurality of B
It is a mixed amplifier that outputs an S-IF · U / V (mixed) signal 29. 21 is installed on the wall of the room or the like, and the BS-I
It is a demultiplexer that receives the F / U / V signal 29 and separates it into a BS-IF signal 27 and a terrestrial U / V television signal 28. Reference numeral 22 is a BS tuner which receives the BS-IF signal 27 and outputs an FM detection output and a bit stream signal. Reference numeral 23 is a scramble decoder (descrambler) which receives the FM detection output and the bit stream signal, descrambles and outputs a video signal and an audio signal. 24 can watch BS pay broadcasting by releasing the scramble, and U /
It is an AV television receiver that can also receive terrestrial broadcasting by inputting a V television signal 28. In order to watch the conventional BS pay broadcasting, one set of the BS tuner 22, the descrambler 23, the AV television 24, etc. is required for each room.
In particular, the descrambler 23 has a high contract fee and a high usage fee.
Owning was a heavy financial burden.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and after descrambling, R
By transmitting / distributing the F-converted TV signal to each room and selecting the TV signal on the TV in each room, BS pay broadcasting can be viewed, and a descrambler for descrambling each room is required. It is an object of the present invention to provide a TV viewing system that does not meet the requirements.

[0004]

In order to achieve the above object, a desired satellite broadcasting channel or communication satellite broadcasting channel is tuned in, a video signal and an audio signal are demodulated, and an FM detection signal and a bit stream signal are transmitted. A CS / BS tuner for generation and output, a scramble decoder for inputting the FM detection signal and the bit stream signal, decoding the scrambled FM detection signal, and outputting a video signal and an audio signal, and the scramble decoder An RF converter for converting the output video signal and audio signal into an RF television signal, a transmission means for mixing and transmitting the RF television signal and a U / V television signal, and then appropriately demultiplexing the RF television signal. It is composed of a television receiver that inputs and selects channels.

[0005]

With the above configuration, the CS / BS tuner selects the desired CS-IF signal or BS-IF signal, and then the FM detection signal and the bit stream signal are generated and output. A descrambler (scramble decoder) decodes the FM detection signal in the scrambled state based on the information of the bit stream signal, and generates and outputs a video signal and an audio signal. The RF converter superimposes an RF television signal obtained by converting the video signal and the audio signal into a predetermined RF band. The transmission means mixes the RF television signal with the U / V television signal and transmits them to each room. The TV receiver in each room selects and receives the broadcast of the desired channel.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A TV viewing system according to the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a T according to the invention.
It is a block diagram of a V viewing system. Reference numeral 1 is a distributor for distributing the BS-IF signal 15. 2 inputs one distributed BS-IF signal, selects the desired channel and FM
It is a first BS tuner having a function of generating and outputting a detection signal and a bit stream signal. A scramble decoder (descrambler) 3 receives the FM detection signal and the bit stream signal, decodes the scrambled FM detection signal, and generates and outputs a video signal and an audio signal. Numeral 4 converts the decoded video signal and audio signal into an RF television signal, and converts it into a predetermined R signal.
It is an RF converter that outputs on the F channel. 5 is the R
F TV signal and U / V TV signal from the antenna 16
And U / V TV signal 1 mixed so as not to interfere with each other.
7 is a first mixer for outputting 7. A second mixer 7 mixes the other distributed BS-IF signal and the U / V television signal 17 without interfering with each other. Reference numeral 8 denotes an amplifier / distributor that amplifies the RF signal to secure a predetermined signal level and outputs an RF signal 18 to be distributed to each room. 9 is the mixed and transmitted BS-IF
Signal and U / V television signal to original BS-IF signal and original U
/ V TV signal 19 for demultiplexing. Reference numeral 10 is a second BS tuner that tunes to BS broadcasts other than pay BS channels (descrambled) to generate and output video signals and audio signals. Reference numeral 11 is a television receiver having a video input.

The operation of the TV viewing system according to the present invention will be described. After selecting a pay broadcast channel with the BS tuner 2, an FM detection signal and a bit stream signal are generated and output. Descrambler (scramble decoder)
In 3, the FM detection signal in the scrambled state is decoded based on the information of the bit stream signal,
Generates and outputs video and audio signals. The RF converter 4 superimposes an RF television signal obtained by converting the video signal and the audio signal into a predetermined RF band. The RF television signal (paid broadcasting), U / V television signal, BS-IF signal is passed through transmission means such as the first mixer 5, the second mixer 7, the amplification distributor 8 and the demultiplexer 9. Is transmitted to each room. In each room, the second BS tuner 10 and the television receiver 11 having a video input are used to watch the pay broadcasting after descrambling and other BS broadcasting and terrestrial broadcasting. If you use CS tuner,
You can watch the broadcast. Further, the first mixer 5 and the second mixer 7 may be replaced with one mixer having three inputs.

[0008]

As described above, according to the present invention, after descrambling, the RF-converted television signal is transmitted / distributed to each room, and the television signal is tuned to the TV in each room, whereby BS broadcasting, It is possible to provide a TV viewing system capable of viewing CS broadcasting and terrestrial broadcasting and not requiring a descrambler for descrambling each room. Therefore, there is a merit of reducing the economical burden when pay TV is viewed on a plurality of televisions in a general home.

[Brief description of drawings]

FIG. 1 is a block diagram of a TV viewing system according to the present invention.

FIG. 2 is a block diagram of a TV viewing system for watching a conventional BS pay broadcast.

[Explanation of symbols]

 1 distributor 2 first BS tuner 3 scramble decoder (descrambler) 4 RF converter 5 first mixer 7 second mixer 8 amplification distributor 9 demultiplexer 10 second BS tuner 11 TV receiver 15 BS-IF signal 16 U / V TV signal from antenna 17 U / V TV signal 18 RF signal 19 Original U / V TV signal 20 Mixing amplifier 21 Splitter 22 BS tuner 23 Scramble decoder (descrambler) 24 AV TV receiver 27 BS-IF signal 28 U / V TV signal 29 BS-IF / U / V (mixed) signal

Claims (2)

[Claims] 1. A CS / BS tuner for selecting a desired satellite broadcasting channel or communication satellite broadcasting channel, demodulating a video signal and an audio signal, and generating and outputting an FM detection signal and a bit stream signal, and the FM. A scramble decoder that inputs a detection signal and a bit stream signal, decodes the scrambled FM detection signal, and outputs a video signal and an audio signal, and a video signal and an audio signal output by the scramble decoder into an RF television signal. RF converter for converting,
A TV viewing system comprising: a transmission means for appropriately demultiplexing the RF television signal and the UV television signal after mixing and transmitting them; and a television receiver for inputting and selecting the RF television signal or the like. . 2. The CS / BS tuner has a function of simultaneously generating and outputting FM detection signals and bit stream signals of a plurality of channels, and a scramble decoder decodes the plurality of scrambled FM detection signals, The TV viewing system according to claim 1, wherein a plurality of sets of video signals and audio signals are output, and the RF converter converts the plurality of sets of video signals and audio signals into RF television signals in different bands for each channel.