Digital modulator having a digital filter including low-speed circuit components
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United States of America Patent
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Jul 20, 1999
Grant Date -
N/A
app pub date -
Oct 8, 1997
filing date -
Oct 11, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A digital demodulator which demodulates an analog signal obtained through a quadrature amplitude modulation to produce a digital demodulated signal includes a converter to convert the analog signal into a digital signal and a signal processor to quadrature-demodulating the digital signal from the converter. Assuming that the analog signal has a carrier frequency of f.sub.IF and the signal conversion is accomplished with the sampling frequency fs, the demodulator is set to satisfy fs=4.multidot.f.sub.IF /(2n+1), where n denotes a positive integer. The signal processing section conducts the quadrature demodulation according to a quadrature local oscillation signal having a frequency fc satisfying fc=fs/4.
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