Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1982-04-05
1987-12-01
Bookbinder, Maro E.
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
455139, 455304, H04B 708
Patent
active
047109750
ABSTRACT:
A space diversity reception system which minimizes the inband amplitude and/or phase dispersion by controlling the phase shifter is described. According to the present invention, the interference waves in the two antenna outputs are combined in anti-phase condition. The phase shifter control direction is decided by the sign of the two parameters. One of them is difference between two antenna levels at the center frequency of the pass-band, and the other is the difference of the combined signal levels at the extreme edges of the pass-band. The control means comprises four detectors for detecting said levels, two subtractors for providing said level differences between them, and the control circuit for deciding the phase shifter control direction.
REFERENCES:
patent: 1794418 (1931-03-01), Potter
patent: 2505266 (1950-04-01), Villem
patent: 2860238 (1958-11-01), Dyke et al.
patent: 3036301 (1962-05-01), Wiesner
patent: 4079318 (1978-03-01), Kinoshita
patent: 4160952 (1979-07-01), Seastrand, Jr.
patent: 4232399 (1980-11-01), Heiter
patent: 4261056 (1981-04-01), Barnett et al.
Horikawa Izumi
Komaki Shozo
Okamoto Yoshiharu
Bookbinder Maro E.
Nippon Telegraph & Telephone Public Corp.
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