Memory select system for an STV decoder

Details Memory select system for an STV decoder Memory select system for an STV decoder

1981-11-18

1984-07-17

Buczinski, S. C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358114, 358123, H04N 716, H04K 104

Patent

active

044609221

ABSTRACT:
A subscription television system includes means broadcasting a scrambled television signal encoded with p-bit program and subscriber authorization codes and m-bit memory write and read codes. Each subscriber is provided with a decoder having (2.sup.m) p-bit memory locations, the decoder being operable for storing a broadcast p-bit subscriber authorization code in a memory location defined by the broadcast m-bit memory write code for updating the decode authorization status of the subscriber and being operable for comparing a broadcast program code with a subscriber authorization code stored in a memory location defined by the broadcast m-bit memory read code for developing a decode authorization signal to effect unscrambling of the broadcast television signal.

REFERENCES:
patent: 4068264 (1978-01-01), Pires
patent: 4115807 (1978-09-01), Pires
patent: 4225884 (1980-09-01), Block et al.
patent: 4292650 (1981-09-01), Hendrickson
patent: 4369462 (1983-01-01), Tomizawa et al.

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