Channel seeking tuning system

Details Channel seeking tuning system Channel seeking tuning system

1974-01-03

1976-06-01

Griffin, Robert L.

325468, H04B 106

Patent

active

039612660

ABSTRACT:
A television tuning system employing a varactor tuner in which the local oscillator frequency is time sampled by an asynchronously gated counting system to provide tuning information for a channel number computer. The computer has a presettable modular scaler and presettable units and tens counters to derive the corresponding channel number and a fractional portion of the intrachannel spacing. A comparator is coupled to the channel number computer for comparing the derived channel number information with the desired or input channel number information. A keyboard-selected channel number is encoded and stored in a memory which supplies the information to the comparator and to a decoder display unit for visually displaying the selected channel number. The memory also supplies information to a band decoder which provides band preset information to the channel computer and selectively activates the VHF and UHF tuners. The comparator controls a ramp voltage source for adjusting the tuning status of the tuner until: (1) equality exists between the derived and desired channel numbers and (2) the modular residue representation of intrachannel spacing is within a predetermined range.

REFERENCES:
patent: 3568083 (1971-03-01), Harzer
patent: 3736513 (1973-05-01), Wilson
patent: 3851254 (1974-11-01), Merrell et al.

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