Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1995-06-07
1996-07-30
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455258, 455316, H04B 126
Patent
active
055421148
ABSTRACT:
In a radio receiver for receiving a radio signal, a counter (32) counts an eventual intermediate frequency of an amplified signal based on a reference signal as a count datum. A frequency controller (27) controls a reference frequency of the reference signal according to the count datum. A reference oscillator (25) is controlled by the frequency controller to produce the reference signal. Receiving a radio signal by double superheterodyne, the radio receiver gives the eventual intermediate frequency to the amplified signal. In the amplified signal, the frequency controller suppresses an eventual frequency drift which results from frequency drifts of a first local oscillation and a second local oscillation. The radio receiver may be a single superheterodyne receiver.
REFERENCES:
patent: 4340974 (1982-07-01), Cooke et al.
patent: 4512035 (1985-04-01), Victor et al.
patent: 4817195 (1989-03-01), Kubo et al.
patent: 5014350 (1991-05-01), Nezu
patent: 5081652 (1992-01-01), Farahati et al.
patent: 5101509 (1992-03-01), Lai
patent: 5107522 (1992-04-01), Kitayama et al.
Kojima Tatsuru
Shimizu Isao
NEC Corporation
Nippon Telegraph and Telephone Corporation
NTT Mobile Communications Network Inc.
Urban Edward F.
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