| 摘要 |
PURPOSE:To release scramble for each program and to release the entire screen by allowing a scramble encoder at a sender side to synthesize a video signal and an audio data into four kinds of different signals for transmission and releasing scramble individually from the signals at a receiver side and separating one pattern and outputting it. CONSTITUTION:Scramble encoders 1-4 at a sender equipment use scramble keys K1-K4 to scramble a frame data and a relevant video signal. A receiver side equipment down-converts the received radio wave and inputs the result to a tuner 9. An FM detection signal from the tuner 9 is inputted to scramble decoders 10-13, in which scramble is released. Each of the scramble decoders 10-13 corresponds respectively to each encoder and only one pattern whose key is matched is subjected to scramble release. Thus, the scramble release for each program and release of entire screens are attained. |
