Phase locked loop tuning system with station scanning provisions

Details Phase locked loop tuning system with station scanning provisions Phase locked loop tuning system with station scanning provisions

1976-10-18

1978-02-28

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

325464, 325470, 358193, 358195, H04B 116

Patent

active

040770087

ABSTRACT:
A tuning system for a television receiver includes a first phase locked loop configuration for controlling the frequency of the receiver's local oscillator signal in accordance with the number of the channel presently being tuned and a second phase locked loop configuration for controlling the frequency of the local oscillator signal to reduce any frequency deviation between the receiver's IF picture carrier and 45.75 MHz corresponding to a frequency offset between the associated RF carrier and the standard RF carrier frequency for the channel being presently tuned due to the frequency translation provided by a television distribution system. The tuning system includes control units for automatically changing the channel number and selectively enabling the operation of the first and second phase locked loop configuration in accordance with a tuning algorithm so that active channels may be automatically located and tuned while preventing the receiver from being erroneously tuned to undesirable signals.

REFERENCES:
patent: 3962640 (1976-06-01), Bomba
patent: 4009439 (1977-02-01), Rast
A uniquely Simplified T.V. Tuning System Incorporating an Equally Unique Digital Automatic & Manual Fine Tuning Scheme, Steve Hilliker, IEEE Trans. on Consumer Electronics, 2/1976, pp. 61-68.

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