H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/30
H04N 7/16 (2006.01)
Patent
CA 1153104
ABSTRACT OF THE DISCLOSURE A method and apparatus for encoding and decoding of standard television signals are provided for enabling reception thereof in an intelligible manner only by authorized subscribers. The scrambling of the audio signals is effected by conversion of analog audio signals to coded digital audio signals. A plurality of unique pulse coded control signals consisting of 32-bit binary pulse trains are transmitted separately to identify individual authorized subscribers and to provide information needed to unscramble the scrambled video and audio signals. When there is a comparision between one of the pulse-coded control signals and a unique address code stored at a particular subscriber's receiver, unscrambling of the video and audio signals occurs in the same sequence as used for scrambling so as to provide restored video and audio signals without degradation in picture and sound qualities. The present invention provides a receiver means capable of receiving such a television signal. The receiver means includes: encryption codes signal detector means; aural detector means; inverse encryption means; and analog conversion means connected to the inverse encryption means to return the audio signal to the original analog format whereby program audio may be processed and presented in a conventional manner.
402001
Bereskin & Parr
Feature Film Services
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