H - Electricity – 04 – M
Patent
H - Electricity
04
M
350/29, 325/3
H04M 1/70 (2006.01) H04K 1/02 (2006.01) H04M 3/16 (2006.01) H04N 7/16 (2006.01) H04N 7/169 (2006.01) H04N 7/171 (2006.01)
Patent
CA 1204162
12 ABSTRACT OF THE DISCLOSURE An exemplary embodiment of the invention utiliz- ing the video channel of a TV signal to transmit synchro- nizing codes for an audio scrambler. Scrambling of the audio is accomplished by digitizing the audio and adding to each sample a pseudo-random digital number. The result- ing digital numbers are converted to analog form for transmission. A digital signal specifying the starting point of the pseudo-random number generator is inserted into the video portion of a line of the vertical blanking interval of the TV signal. At the receiving station, the digital number specifying the starting point of the pseudo- random number generator is utilized to set the starting point of a pseudo-random number generator which generates numbers which are utilized to descramble the audio.
424946
Oldham And Company
Westinghouse Electric Corporation
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