Adaptive phase locked loop filter for television tuning

Details Adaptive phase locked loop filter for television tuning Adaptive phase locked loop filter for television tuning

1976-11-02

1977-10-11

Grimm, Siegfried H.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

325464, 325421, 331 17, 331 25, H03B 304, H04N 544

Patent

active

040539334

ABSTRACT:
A low-pass filter useful in association with a phase locked loop for controlling the frequency of a voltage controlled oscillator on the basis of an error signal resulting from a comparison between a reference signal and the oscillator's output. The low-pass filter comprises means responsive to the error signal for developing an output current for charging or discharging a capacitive network according to the frequency and phase deviations represented by the error signal. For large frequency and phase deviations extended charging or discharging currents provide high acquisition speeds whereas, as the frequency and phase deviation represented by the error signal decreases, drastically reduced charging or discharging currents result thereby effectively reducing the bandwidth of the filter for facilitating reference signal sideband supression as frequency "lock-on" is approached and when phase lock is achieved.

REFERENCES:
patent: 3316497 (1967-04-01), Brooks
patent: 3694776 (1972-09-01), Linder
patent: 3701039 (1972-10-01), Lang et al.
patent: 3701059 (1972-10-01), Nyswander
patent: 3939438 (1976-02-01), Taylor
patent: 3946148 (1976-03-01), Skerlos
patent: 3980969 (1976-09-01), Stengel

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