Digital tuner

Details Digital tuner Digital tuner

1979-09-24

1981-07-28

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455182, 455183, H04B 140

Patent

active

042814154

ABSTRACT:
A variable rate tuner is one in which the rate of change of tuned frequency with respect to tuning shaft rotation varies automatically as a function of the shaft rotation speed. In this tuner the circuitry is completely digital, including a shaft encoder which puts out shaft velocity and shaft direction signals. A digital multiplier multiplies or divides the shaft velocity signal. A counter selects the multiplication factor as a function of shaft velocity. The multiplied velocity signal then increments or decrements a frequency-determining quantity, depending upon whether the shaft direction is such as to increase or decrease the tuned frequency.

REFERENCES:
patent: 3806818 (1974-04-01), Uchiyama
patent: 3835384 (1974-09-01), Liff
patent: 3949305 (1976-04-01), McClaskey
patent: 4097810 (1978-06-01), Achwanden
patent: 4123716 (1978-10-01), Borg
patent: 4127822 (1978-11-01), Mogi

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