Modulators – Frequency shift keying modulator or minimum shift keying...
Reexamination Certificate
2011-03-01
2011-03-01
Mis, David (Department: 2817)
Modulators
Frequency shift keying modulator or minimum shift keying...
C332S103000, C332S117000, C332S149000, C455S323000
Reexamination Certificate
active
07898351
ABSTRACT:
There is provided a modulation circuit including a sampling unit that over-samples an input digital signal based on a multiplying clock signal, and outputs a first over-sampling signal, a first frequency conversion unit that outputs a first high-frequency signal based on the first over-sampling signal and a reference signal, a first filter unit that outputs a second high-frequency signal based on a second over-sampling signal obtained by delaying the first over-sampling signal by one clock and the reference signal, a second filter unit that outputs a third high-frequency signal based on a third over-sampling signal obtained by delaying the second over-sampling signal by one clock and the reference signal, and an adder unit that adds the first high-frequency signal, the second high-frequency signal, and the third high-frequency signal, and outputs an output signal.
REFERENCES:
patent: 5781076 (1998-07-01), Iwamatsu et al.
patent: 04-207439 (1992-07-01), None
patent: 08-317010 (1996-11-01), None
patent: 10-093448 (1998-04-01), None
patent: 2003-244259 (2003-08-01), None
Finnegan, Henderson, Farabow, Garrett & L.L.P.
Mis David
Sony Corporation
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