High performance frequency tuning with low cost synthesizer

Details High performance frequency tuning with low cost synthesizer High performance frequency tuning with low cost synthesizer

1992-04-07

1994-04-05

Dwyer, James L.

Telecommunications

Transmitter and receiver at same station

With frequency stabilization

4551531, 4551923, 455260, H04B 140, H04B 116

Patent

active

053013662

ABSTRACT:
A communication system and a method for using an approximating frequency synthesizer with frequency correction by digital signal processing (DSP) means to provide a radio transmitter or receiver with rapid high resolution tuning capabilities. A user selects a frequency upon which he wishes to transmit or receive information. An approximating synthesizer is used to provide an RF injection frequency. A radio controller interprets the user selected frequency and determines the closet available approximating synthesizer frequency. The controller commands the approximating synthesizer to the determined available frequency and calculates the difference in the determined available frequency and the user selected frequency. The calculated difference or error is passed on to the DSP for correction during frequency mixing in a single or multiple step process.

REFERENCES:
patent: 4602225 (1986-07-01), Miller et al.
patent: 5152005 (1992-09-01), Bickley
patent: 5170497 (1992-12-01), Uchikura
Knuth, Donald E., "Analysis of Euclid's Algorithm", The Art of Computer Programming, vol. 2, 2nd ed. (1981) pp. 339-343.

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