Bandstart detector system for a television tuning system

Details Bandstart detector system for a television tuning system Bandstart detector system for a television tuning system

1974-06-03

1976-06-01

Libman, George H.

325464, H04B 116

Patent

active

039612635

ABSTRACT:
A bandstart detector system for a television receiver tuning system wherein a sample of oscillator signals utilized for conversion of radio frequencies into intermediate frequencies is coupled to a plurality of tuned circuits. Detecting means are coupled to each of the tuned circuits to produce control signals having an amplitude inversely related to the difference between the oscillator signal frequency and the resonant freqency of each of the tuned circuits. The amplitude of the control signal will vary as the oscillator signal frequency is swept in a regular manner through a predetermined band of frequencies corresponding to television channel frequency allocations. The control signals are coupled to a sensing circuit which produces one output signal when the control signal is below a predetermined level and a second output signal when the control signal is above a predetermined level. The output signals produced by the sensing circuit are utilized to initiate counting of pulses, each produced as a result of a frequency comparison of a plurality of harmonically related frequency samples with a regularly recurring variation of the oscillation frequency. The resultant pulses are allowed to be accumulated in a counter employed to identify the channel being received.

REFERENCES:
patent: 3427561 (1969-02-01), Hamer
patent: 3641434 (1972-02-01), Yates et al.
patent: 3798553 (1974-03-01), Sakamoto
patent: 3818353 (1974-06-01), Sakamoto
patent: 3824475 (1974-07-01), Pflasterer
patent: 3835248 (1974-09-01), Harford

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