TELEVISION SIGNAL SCRAMBLING AND DATA TRANSMISSION

专利名称：TELEVISION SIGNAL SCRAMBLING AND

DATA TRANSMISSION SYSTEM

发明人：CITTA, Richard, W.,MUTZABAUGH, Dennis,

M.,SGRIGNOLI, Gary, J.

申请号：EP86902964.5申请日：19860314公开号：EP0215946B1公开日：19920610

摘要：a system for the transmission of television signals includes a transmitting unit(10) with a pair of filters (22, 24) of surface acoustic waves (saw) at equal time.a filter (22)having amplitude and phase characteristics are normalized with respect to the

continuously variable frequency response in approximately 180 degrees to 6 db and thefrequency of the video carrier, on the one hand, and zero zero db and the ratedfrequency of the porteus (e) the television signal of the other; the second filter (24) ofthe amplitude and phase responses of standardisationthe frequency of the substantiallyflat, and the video carrier.a video signal of high frequency is applied to the two filters (22,24), the output of the first filter (22) is selected to be transmitted during at least aportion of the horizontal blanking interval of the television signal, the exit of the secondfilter (24). both selected to be transmitted to the rest of the time.the transmitted signalis received by a decoder (66) includes a detector (80), a stable phase modulation, dualphase, and a third and fourth filters (72, 74) having response characteristics which arecomplementary to those of the filters (22, 24).the received signal is applied to the thirdand fourth filters (72, 74), said that the outputs are selectively switched to an output

terminal (84) in response to the detector (80) to restore the phase modulation signal.

申请人：ZENITH ELECTRONICS CORPORATION

地址：ZENITH CENTER 1000 MILWAUKEE AVENUE; GLENVIEW ILLINOIS 60025

代理机构：Baillie, Iain Cameron

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