Telecommunications – Transmitter and receiver at same station – With a common signal processing stage
Reexamination Certificate
2005-01-04
2005-01-04
Appiah, Charles (Department: 2686)
Telecommunications
Transmitter and receiver at same station
With a common signal processing stage
C455S076000, C455S113000
Reexamination Certificate
active
06839548
ABSTRACT:
A radio communication device modulates a received audio signal with an intermediate frequency (IF) signal before mixing with the radio frequency (RF) waveform for transmission by an antenna. A voltage controlled oscillator is utilized, which is tuned to N times the desired IF frequency. This voltage controlled oscillator is frequency modulated with the inputted audio signal to a deviation N times the desired IF source deviation. The voltage controlled oscillator is locked in a phase locked loop with a system reference frequency so that the output frequency is N times the desired IF frequency. The output of the voltage controlled oscillator is supplied to a “divide-by-N” frequency prescaler for generating a signal at precisely the right IF frequency and deviation.
REFERENCES:
patent: 4590439 (1986-05-01), Goggin
patent: 4603304 (1986-07-01), Burns et al.
patent: 4670888 (1987-06-01), Smith, III
patent: 4864634 (1989-09-01), Nakagawa et al.
patent: 5065408 (1991-11-01), Gillig
patent: 5230088 (1993-07-01), Kramer, Jr. et al.
patent: 5276915 (1994-01-01), Marko et al.
patent: 5291474 (1994-03-01), Ikonen et al.
patent: 5319799 (1994-06-01), Morita
patent: 5423076 (1995-06-01), Westergren et al.
patent: 5444737 (1995-08-01), Cripps et al.
patent: 5459435 (1995-10-01), Taki
patent: 5748046 (1998-05-01), Badger
patent: 6647247 (2003-11-01), Vuolteenaho
patent: 3411883 (1985-10-01), None
patent: 4-245814 (1992-09-01), None
Appiah Charles
International Business Machines - Corporation
Munoz-Bustamante Carlos
Winstead Sechrest & Minick P.C.
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