CATV converter

Details CATV converter CATV converter

1988-04-28

1990-07-03

Buczinski, Stephen C.

Cryptography

Key management

Having particular key generator

380 7, 380 19, H04N 716

Patent

active

049397800

ABSTRACT:
A CATV converter having a filter for extracting a voice intermediate frequency signal superposed with a data signal necessary to descramble a scrambled television signal by AM modulation, a synchronous detector responsive to the extracted voice intermediate frequency signal for detecting the data signal, a tank circuit for tuning with the carrier to apply the carrier of the voice intermediate frequency signal to the synchronous detector, and a voice detector for producing the voice intermediate frequency signal from the tank circuit to input it thereto. Thus, the converter can separately produce a data signal and a voice signal at a preferable S/N ratio with a simple configuration.

REFERENCES:
patent: 3144512 (1964-08-01), McAllan et al.
patent: 3946338 (1976-03-01), Schmidt
patent: 4470071 (1984-09-01), Rindal
patent: 4670904 (1987-06-01), Rumreich
patent: 4706285 (1987-11-01), Rumreich
patent: 4718086 (1988-01-01), Rumreich et al.

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