Telegraphy – Systems – Simplex-reversing periodic
Patent
1974-08-05
1976-02-03
Farley, Richard A.
Telegraphy
Systems
Simplex-reversing periodic
325138, 325144, 325145, H04N 144
Patent
active
039365930
ABSTRACT:
An improved scrambler and decoder for a television signal is described wherein a television carrier is inverted in phase and subjected to low frequency amplitude modulation to obtain enhanced channel security. The carrier amplitude modulation is obtained with a coding signal which is transmitted as a pilot signal in the form of frequency modulation of the carrier. The coding signal is recovered at the decoder with a phase lock network and used to regenerate an unscrambled carrier. The coding signal provides information for special functions such as subscriber access control, program selection and the like.
REFERENCES:
patent: 2709218 (1955-05-01), Gabrilovitch
patent: 3180927 (1965-04-01), Heppe et al.
patent: 3500250 (1970-03-01), Frerking
patent: 3729576 (1973-04-01), Court
patent: 3852519 (1974-12-01), Court
Aaronson Gerald
Murphy William D.
Buczinski S. C.
Farley Richard A.
GTE Laboratories Incorporated
Hart Leslie J.
Kriegsman Irving M
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