Search type tuning device

Details Search type tuning device Search type tuning device

1975-03-14

1977-01-18

Richardson, Robert L.

Oscillators

Relaxation oscillators

325335, 325423, 325453, 331 49, H04B 132

Patent

active

040042332

ABSTRACT:
A search type tuning device wherein the output signal representing the difference frequency between the output frequency from a voltage-controlled frequency sweep oscillator and a reference frequency is filtered by a low-pass filter; the difference between the output voltage from the low-pass filter and a predetermined driving voltage for sweeping the oscillation frequency of the oscillator is derived from an adder; the output from the adder is integrated by an integrator; and the output voltage from the integrator is applied as a sweep voltage to the oscillator, thereby automatically maintaining the oscillation frequency thereof at a predetermined value. The analysis of the operation of the oscillator may be much facilitated, and when used as an automatic channel selector for a television receiver, a high speed automatic channel selection may be ensured.

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patent: 3936753 (1976-02-01), Clark
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patent: 3946329 (1976-03-01), Caspari
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