Tuning of a radio receiver

Details Tuning of a radio receiver Tuning of a radio receiver

1993-11-24

1996-06-04

Pham, Chi H.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551781, 4551822, 4551841, 4551923, 4551932, 455340, H04B 118

Patent

active

055242880

ABSTRACT:
The present invention relates to a method of tuning a radio receiver to a desired frequency. The frequency of each tuning circuit in the radio receiver is controlled by controlling the capacitance diodes of the tuning circuits. The control is accomplished with an individual DA converter arranged for each tuning circuit with which the frequency of the tuning circuit associated therewith can be controlled independently of the other tuning circuits. The optimal control values of each DA converter is defined at least in two points of the frequency range of the radio receiver. These control values are stored in a memory provided in the radio receiver. On the basis of the stored control values the control values for the entire frequency range are calculated for each control means.

REFERENCES:
patent: 2865986 (1958-12-01), Parker
patent: 4685150 (1987-08-01), Maier
patent: 4794650 (1988-12-01), Yokoyama
patent: 5101509 (1992-03-01), Lai
Finnish Office Action dated Aug. 23, 1993 on corresponding Finnish Application 925621, English translation of Finnish Office Action.
Patent Abstracts of Japan vol. 12, No. 461 (E-689) Alpine Electron Inc. Jul. 30, 1988.
Patent Abstracts of Japan vol. 14, No. 348 (E-957) NEC Corp. May 9, 1990.
European Search Report on Application No. EP 93 30 9413.8.

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