Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1987-01-21
1988-10-04
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455186, 455190, 3581931, H03J 116, H04N 550
Patent
active
047760389
ABSTRACT:
A television receiver cable of tuning either "air" channels in an "air" tuning mode or "cable" channels in a "cable" tuning mode includes apparatus for automatically selecting the tuning mode. The auto-tuning mode apparatus operates in conjunction with apparatus for automatically programming a memory for storing tuning information for tunable channels. When the auto-programming mode is selected, the receiver is caused to operate in the cable tuning mode and a search is conducted for active cable channels. If a predetermined number of active cable channels is located, the receiver remains in the cable tuning mode and the memory is programmed with tuning information for all of the cable channels. If the predetermined number of cable channels is not located, the receiver is caused to operate in the air tuning mode and the memory is programmed with tuning information for all of the air channels.
REFERENCES:
patent: 4009441 (1977-02-01), Kumagai et al.
patent: 4398303 (1983-08-01), Chin et al.
patent: 4402089 (1983-08-01), Knight et al.
patent: 4405947 (1983-09-01), Tults et al.
patent: 4419768 (1983-12-01), Yamashita et al.
patent: 4430669 (1984-02-01), Cheung
patent: 4518993 (1985-05-01), Okada et al.
patent: 4555809 (1985-11-01), Carlson
"RCA Color Television Basic Service Data-1986 CTC 133", the description on pp. 1-18 and the schematic on pp. 2-8.
Teskey John F.
Testin William J.
Emanuel Peter M.
Griffin Robert L.
Kuntz Curtis A.
Rasmussen Paul J.
RCA Licensing Corporation
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