H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/30
H04N 7/16 (2006.01) H04N 7/04 (2006.01) H04N 7/169 (2006.01)
Patent
CA 1148252
31 47,601 ABSTRACT OF THE DISCLOSURE An audio scrambler digitally samples a continu- ous audio signal, scrambles the derived samples and in- serts at least one scrambled sample in the unoccupied region of the video signals of a video system for trans- mission line per line as an analog composite audio-video signal. A RAM device is used for this purpose which has the digital samples stored sequentially, then read at ran- dom. A special memory arrangement is used as a scratchpad in order to insure that while addressing the RAM at random there will be no repetition, nor omission of a particular address. Provision is made for the insertion of more than one sample per video line, in-particular while transmit- ting severe audio signals on the same video system. The same technique is used at the receiver end for unscram- bling the samples once extracted from the video lines.
349251
Oldham And Company
Westinghouse Electric Corporation
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