Automatic digital fine tuning system

Details Automatic digital fine tuning system Automatic digital fine tuning system

1984-10-24

1986-07-15

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455182, 455265, 3581951, H04B 126, H04N 550

Patent

active

046010602

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.

REFERENCES:
patent: 3821650 (1974-06-01), Kase et al.
patent: 4077008 (1978-02-01), Rast et al.
patent: 4118740 (1978-10-01), Rypkema
patent: 4320533 (1982-03-01), Hashima
patent: 4322751 (1982-03-01), Hongu et al.
patent: 4485404 (1984-11-01), Tults
"Philips Technical Information 034, TDA2540 and TDA2541 New Vision i.f. ICS", Philips Electronic Components and Materials.

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