Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1982-12-27
1985-02-12
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
455278, 455297, H04B 708, H04B 110
Patent
active
044996063
ABSTRACT:
A system for enhancing the quality of a signal received by a mobile FM transmitter by reducing the adverse effects of multipath transmission to the receiver. A pair of antennas is provided, and each antenna is arranged to receive transmitted signals that traverses a different path. The signal produced in the receiver by one antenna is compared with a reference threshold and when the amplitude of the signal falls below the reference threshold, the receiver switches to the other antenna. The signal amplitude is sensed in a high frequency portion of the receiver, i.e. before detection or demodulation, so that switching between antennas occurs rapidly and is normally not perceived by the user of the receiver. Sensitivity to switching is dependent on the rate of change of the received signal amplitude and on the modulation frequency of the received signal so that the system responds both to an overall reduction in received signal strength and to reduction in the strength of the high frequency portions of the received signal.
REFERENCES:
patent: 2243118 (1941-05-01), Peterson
patent: 2520984 (1950-09-01), Williams
patent: 2729741 (1956-01-01), Chapman
patent: 2872568 (1959-02-01), Provaz
patent: 2904677 (1959-09-01), Heidester
patent: 2937268 (1960-05-01), Downie
patent: 3182263 (1965-05-01), Gossard
patent: 3329901 (1967-07-01), Case
patent: 3368151 (1968-02-01), Verwey et al.
patent: 3475686 (1969-10-01), Holt
patent: 3537011 (1970-10-01), Escoula
patent: 3670275 (1972-06-01), Kalliomaki et al.
patent: 4091386 (1978-05-01), Luedtke et al.
patent: 4143369 (1979-03-01), Ayers et al.
patent: 4170759 (1979-10-01), Stimple et al.
patent: 4255816 (1981-03-01), Grunza et al.
Experimental Switched-Diversity System for VHF AM Mobile Radio--Parsons Proc. IEE, vol. 122, No. 8, pp. 780-784, Aug. 1975.
FM Multipath Distortion in Automobile Receivers Has Been Significantly Reduced By a New Antenna System--Takeda et al., IEEE Trans on Consumer Electronics, vol. CE-26, Aug. 1980, pp. 263-269.
Beckman Victor R.
Bookbinder Marc E.
SRI - International
LandOfFree
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