Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1984-05-18
1986-07-08
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358118, H04N 7167
Patent
active
045996466
ABSTRACT:
A head-end apparatus for a CATV system is provided for facilitating identification of unauthorized or defective converter/decoder boxes in the system. According to the invention, an IF audio signal, representing the aural portion of the program source to be transmitted, is applied to a scrambler which generates a scrambled IF audio signal having a scramble signal component. The scrambler has a synchronization rate set by a program source having a sync rate different than the sync rate of the program source to be transmitted. The scrambled IF audio signal is then combined with an IF video signal, representing the video portion of the program source to be transmitted, to produce a composite signal. The composite signal is then modulated to the desired CATV channel output frequency and transmitted to the user. In operation, an unauthorized or defective converter/decoder box in the CATV system injects the scramble signal component of the scrambled IF audio signal on the unscrambled video IF signal, thus scrambling a non-premium channel of a CATV system. When the user notifies the CATV system operator of the defective condition on the non-premium channel, an indication is provided that the converter/decoder box is either unauthorized or defective.
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Buczinski S. C.
D-Tec Industries, Inc.
Judson David H.
O'Neil Michael A.
Wallace Linda J.
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