Tuning arrangement for providing relatively uniform automatic fi

Details Tuning arrangement for providing relatively uniform automatic fi Tuning arrangement for providing relatively uniform automatic fi

1981-11-27

1984-05-22

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455192, H04B 126

Patent

active

044505876

ABSTRACT:
A tuning control system includes a pulse converter for converting a digital word to a corresponding pulse signal having pulses the width or frequency of which represents the magnitude of a tuning voltage associated with a respective channel. The pulse signal is applied to a filter which produces the tuning voltage. An automatic fine tuning (AFT) voltage is generated by an AFT discriminator in an IF section and also applied to the filter to modify the magnitude of the tuning voltage to correct for any frequency deviation of the IF signal. To make the response of the tuner to changes of the AFT voltage more uniform for different channels, the AFT voltage is applied to the filter through a switch which is selectively closed in response to the pulses of the pulse signal so as to change the effective amplitude of the AFT voltage applied to the filter as a function of the channel selected.

REFERENCES:
patent: 2872579 (1959-02-01), Kihn
patent: 3631347 (1971-12-01), Chipman
patent: 3814843 (1974-06-01), Kruszewski
patent: 4122493 (1978-10-01), Arumugham et al.
patent: 4125863 (1978-11-01), Arumugham
patent: 4142157 (1979-02-01), Tanaka
patent: 4245351 (1981-01-01), Tults
patent: 4262364 (1981-04-01), Fujita
"Digitales Programmspeicher-System" by Friedrich Timmermann, Funkschau 1977, Heft 17, (with partial translation).

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