Automatic digital fine tuning system

Details Automatic digital fine tuning system Automatic digital fine tuning system

H - Electricity

03

J

365/5

H03J 7/04 (2006.01) H03J 7/06 (2006.01)

Patent

CA 1213384

ABSTRACT In automatic fine tuning (AFT) apparatus in a superheterodyne receiver, the IF carrier is selectively filtered and is applied to a signal multiplier arrangement. An auxiliary heterodyning signal is also applied to the multiplier arrangement, so as to produce an offset signal having a frequency proportional to the frequency difference between the IF carrier and the heterodyning signal. The offset signal is applied to a microprocessor programmed to produce a control signal for controlling the local oscillator to reduce frequency deviation between the IF signal and a nominal IF frequency.

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