H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/30
H04N 7/16 (2006.01)
Patent
CA 1155952
ABSTRACT OF THE DISCLOSURE A method and apparatus for encoding and decoding of standard television signals are disclosed 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. There is provided a subscription television transmitter which can transmit separately a plurality of unique pulse coded control signals consisting of 32-bit binary pulse trains to identify individual authorized sub- scribers and to provide information needed to unscramble the scrambled video and audio signals. The transmitter generates television signals having a program video portion and a program aural portion in a non-standard format to enable reception of both program video and program audio portions in an intelligible manner only by authorized sub- scribers. It includes: an encryption code signal generating means; a carrier signal generating means; means for digitizing the program audio signal; means responsive to the encryption code signal for digitally encrypting the digitized program - 2 - audio signal from the digitizing means; and means for com- bining the encryption codes signal, the digitized and encrypted audio program signal and a video program signal, with the carrier signals whereby the encryption codes signal, the digitized and encrypted audio signal and the video signal can be individually separated at a receiver.
414640
Bereskin & Parr
Feature Film Services
LandOfFree
Subscriber-limited reception television broadcast security... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Subscriber-limited reception television broadcast security..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Subscriber-limited reception television broadcast security... will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1004513