Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation
Patent
1992-11-23
1994-11-01
Urban, Edward F.
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency or phase modulation
455258, 455316, H04B 126
Patent
active
053614070
ABSTRACT:
A superheterodyne receiver comprises a variable frequency oscillator of PLL (phase-locked loop) type for implementing a first local oscillator and a variable frequency oscillator not of PLL type for implementing a second local oscillator. At least the frequency of a first locally generated signal is varied at reception to vary a received frequency, the frequency of the first locally generated signal is set at frequency calibration to a level equal to the frequency of a first intermediate-frequency signal, the second intermediate-frequency signal is frequency-converted by a BFO signal to a signal having a frequency of voice band, and the frequency of a second locally generated signal is calibrated to set the frequency of the frequency-converted signal to a specified level.
REFERENCES:
patent: 3593153 (1971-07-01), Maitland
patent: 3938048 (1976-02-01), Elliott
patent: 4512035 (1985-04-01), Victor
patent: 4545072 (1985-08-01), Skutta
patent: 4696056 (1987-09-01), Morita
patent: 4727591 (1988-02-01), Manlove
patent: 5203032 (1993-04-01), Usui
Sakai Tadashi
Sawada Takeshi
Eslinger Lewis H.
Maioli Jay H.
Sony Corporation
Urban Edward F.
Wisler Mark D.
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