Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1994-05-20
1996-03-12
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
455209, 455260, H04B 700
Patent
active
054993938
ABSTRACT:
A receiver which has a linear approximation expression showing a relationship between the frequency deviations and corresponding changes to the voltage which is to be supplied to the voltage controlled reference oscillator to adjust the deviation following a reception frequency. The frequency deviation of the voltage controlled temperature compensated crystal oscillator is calculated based on the count values of the counters which count the frequency of the second local oscillator and the second intermediate frequency. The control voltage supplied to the voltage controlled temperature compensated oscillator is changed based on the linear approximation expression. Further, the approximation expression is represented as a series of powers of 2 based on a sensitivity coefficient of the voltage controlled reference oscillator. The approximation expression is changed by renewing the sensitivity coefficient of the voltage controlled reference oscillator. Moreover, in addition to the control of the voltage controlled reference oscillator, the second local oscillator is controlled in the similar way of the control of the voltage controlled temperature compensated oscillator to obtain more accurate intermediate frequency.
REFERENCES:
patent: 4679246 (1987-07-01), Jeng
patent: 4859968 (1989-08-01), Gershon
patent: 4932072 (1990-06-01), Toko
patent: 5163164 (1992-11-01), Tults
patent: 5357215 (1994-10-01), Greiderer
patent: 5361407 (1994-11-01), Sawada et al.
patent: 5424687 (1995-06-01), Fukuda
I. Shimizu et al., NTT Electrical Communications Laboratories, "Measuring Method of Received Signal Frequency in Mobile Communications", Institute of Electronics and Comm. Engineers of Japan Comm. Part National Meeting 1986, No. 449.
I. Shimizu et al., NTT Electrical Communications Laboratories, "Received Frequency Detection in Mobile Radio Communications", Institute of Electronics and Comm. Engineers of Japan 70th Annual National Meeting 1987, No. 2197.
Banks-Harold Marsha D.
Eisenzopf Reinhard J.
Mitsubishi Denki & Kabushiki Kaisha
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