Search type tuning device

Details Search type tuning device Search type tuning device

H - Electricity

03

J

365/5, 365/8

H03J 7/18 (2006.01) H03J 5/02 (2006.01) H03J 7/26 (2006.01)

Patent

CA 1052486

TITLE OF THE INVENTION: A Search Type Tuning Device ABSTRACT OF THE DISCLOSURE: A search type tuning device wherein the output signal representing the difference frequency between the output fre- quency 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.

222818

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