Dual mode frequency synthesizer for a television tuning apparatu

Details Dual mode frequency synthesizer for a television tuning apparatu Dual mode frequency synthesizer for a television tuning apparatu

1977-01-10

1978-03-07

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

325453, 325464, 325468, 358191, H04B 116

Patent

active

040782123

ABSTRACT:
Television tuning apparatus includes a first phase locked loop configuration for tuning a local oscillator to a nominal frequency appropriate for converting a standard radio frequency carrier allocated to a selected channel to a predetermined intermediate frequency (e.g., 45.75 MHz) and a second phase locked loop configuration for tuning the local oscillator to minimize any deviation between the actual frequency of the I.F. picture carrier and its nominal frequency which may occur, for example, because the receiver is coupled to a distribution system utilizing frequency conversion apparatus which provides nonstandard radio frequency carriers arbitrarily near respective standard frequency carriers. The two phase locked loop configurations include common elements and control apparatus to selectively initiate the operation of one loop while inhibiting the operation of the other in accordance with a predetermined tuning algorithm.

REFERENCES:
patent: 3821650 (1974-06-01), Kase et al.
patent: 3839678 (1974-10-01), Bell
patent: 3883807 (1975-05-01), Alberkrack
patent: 3913020 (1975-10-01), Van Anrooy
patent: 3949305 (1976-04-01), McClaskey et al.
patent: 4025953 (1977-05-01), Sideris
IEEE Transaction on Consumer Electronics on "Simplified TV Tuning System" by Hilliker, pp. 61-68, 1-1976.

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