Digital modulator having a digital filter including low-speed ci

Details Digital modulator having a digital filter including low-speed ci Digital modulator having a digital filter including low-speed ci

1997-10-08

1999-07-20

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

329306, 375261, 375328, 375329, H03D 300, H04L 2722, H04L 2738

Patent

active

059260653

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.

REFERENCES:
patent: 5172070 (1992-12-01), Hiraiwa et al.

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