Transmitter selection circuit for a radio or television receiver

Details Transmitter selection circuit for a radio or television receiver Transmitter selection circuit for a radio or television receiver

1976-06-30

1978-03-07

Safourek, Benedict V.

Oscillators

Relaxation oscillators

325464, 331 1A, 331 18, 331 25, 358191, H04B 116

Patent

active

040782131

ABSTRACT:
A receiver for radio or television signals having a channel selection device for controlling the frequency of a local oscillator whereby to adjust this to mix with signals on different selected frequencies to produce an intermediate frequency signal for demodulation, in which the local oscillator is controlled by a variable impedance device the impedance of which is varied by an error signal produced by comparing a reference signal with a signal divided down from the output of the local oscillator. The dividers are programmable dividers which operate with different division factors in dependence on a control signal from a keyboard or other control device. The reference oscillator is an oscillator used for other purposes in the receiver, and the local oscillator frequencies are multiples of 0.5 MHz, the intermediate frequency being 38.75 MHz.

REFERENCES:
patent: 3980951 (1976-09-01), Breeze et al.
"A Frequency Synthesizer for Television Receivers" - Eric Breeze, Aug. 1974 - Fairchild Journal of Semiconductor Progress, vol. 2, #8 pp. 3-8.
"Television Simplified" - 5th Edition - Milton S. Kiver - 1955, pp. 494-495.
"A Uniquely Simplified TV Tuning System Incorporating An Equally Unique Digital Automatic and Manual Fine Tuning Scheme" -Steve Hilliker, Motorola Semiconductor Products, Inc., Feb. 1976, pp. 61-68.

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