JPS6088668U

JPS6088668U - Scrambler for pay television system

Info

Publication number: JPS6088668U
Application number: JP18012583U
Authority: JP
Inventors: 弘五十嵐
Original assignee: クラリオン株式会社
Priority date: 1983-11-24
Filing date: 1983-11-24
Publication date: 1985-06-18
Also published as: JPH0119502Y2

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は有料テレビジョン番システムの一般的な構成を
示すブロック図、第２図は従来のスクランブル装置の構
成を示すブロック図、第３図は本考案によるスクランブ
ル装置の構成を示すブロック図、第４図は送信される信
号のスペクトル図である。１・・・・・・ヘッド・エンド、２・・・・・・変調器
、３・・・・・・制御信号発生器、４・・・・・・混合
器、５・・回分配器、６ａ〜６ｄ・・・・・・分岐器、
７ａ〜７ｄ・・・・・・スクランブル装置、８ａ〜８ｄ
・・・・・・テレビ受信機、９・・・・・・入力、１０
・・・・・・出力、１１・・・・・・分波器、１２・・
・・・・第１のフィルタ゛、１３・・・・・・復調器、
１４・・曲制御器、１６・・・・・・混合器、１７・・
四周波数変換器、１８・・・・・・第２のフィルタ。FIG. 1 is a block diagram showing the general configuration of a pay television number system, FIG. 2 is a block diagram showing the configuration of a conventional scrambling device, and FIG. 3 is a block diagram showing the configuration of a scrambling device according to the present invention. FIG. 4 is a spectrum diagram of the transmitted signal. DESCRIPTION OF SYMBOLS 1... Head end, 2... Modulator, 3... Control signal generator, 4... Mixer, 5... Distribution distributor, 6a ~6d... Turnout,
7a-7d... Scramble device, 8a-8d
...TV receiver, 9...Input, 10
...Output, 11...Dunplexer, 12...
...First filter, 13...Demodulator,
14... Music controller, 16... Mixer, 17...
four frequency converters, 18...second filter;

Claims

[Scope of utility model registration request]

Frequency fp from the broadcast signal on the branch line branched from the main line
a splitter that separates and outputs the control signal, a first filter that passes the control signal, a demodulator that demodulates the signal that has passed through the filter, and a controller that controls scrambling on and off using the demodulated signal. , the frequency of the interference signal is set to f under the control of the controller. , an oscillator that oscillates at a frequency of fc-f, a signal of frequency fP that has passed through the first filter, and a signal of frequency f. -fP and mix the outputs of the above oscillators at frequency f. A pay television system comprising: a frequency converter that outputs a jamming signal; a second filter that passes the jamming signal; and a mixer that returns the output of the second filter to the branch line. scrambling device.