Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1988-06-13
1989-04-11
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
3581931, 455135, H04N 5268, H04B 106
Patent
active
048211222
ABSTRACT:
A receiver includes a video switch operated by a controller for selecting antenna or auxiliary (baseband) video signals for display. When placed in a "VCR" operating mode the controller first selects the auxiliary input for display. If a video signal is not present at the auxiliary input the controller causes the switch to select the output of a tuner thereby providing an automatic signal search to locate the VCR signal which may be applied to either of the antenna and auxiliary inputs. An extension of the search includes tuning the tuner to channel 3 and, if no signal is found, tuning the tuner to channel 4. Upon failure to find an active video signal on either channel the tuner is returned to the last channel received prior to selecting the VCR mode of operation thereby releaving the user of both mode selection and channel selection requirements for locating the VCR signal.
REFERENCES:
patent: 3922641 (1975-11-01), Gates
patent: 4097899 (1978-06-01), Yu
patent: 4329675 (1982-05-01), Van Hulle
patent: 4361854 (1982-11-01), Wolfe
patent: 4463382 (1984-07-01), Pellegrini
patent: 4468701 (1984-08-01), Burcher
patent: 4680634 (1987-07-01), Nanba
Chinese language document entitled "The Principle of CATV System", by Kuo-rong Lin, published by Chuan-Hwa Science and Technology Book Col., Ltd. 1-1986.
Chin Tommy P.
Rasmussen Paul J.
RCA Licensing Corporation
Whitacre Eugene M.
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