Pulse or digital communications – Receivers – Angle modulation
Patent
1996-10-11
1997-09-09
Tse, Young T.
Pulse or digital communications
Receivers
Angle modulation
375332, 375355, 329306, H04L 700
Patent
active
056663862
ABSTRACT:
In a digital data demodulating apparatus, total number of low-pass filters is reduced by supplying variable sampling clock signals to A/D converters coupled to the low-pass filters. The digital data demodulating apparatus for receiving/demodulating a transmission signal that is modulated by digital data in a predetermined modulation manner, includes: a detecting unit for detecting the transmission signal; a low-frequency component passing unit for causing a low-frequency component of the transmission signal detected by the detecting unit to selectively pass therethrough; an analog-to-digital (A/D) converting unit for A/D-converting the output from the low-frequency component passing unit into a digital transmission signal; a demodulating unit for demodulating the digital transmission signal from the A/D converting unit; and a switching unit for switching a frequency of a sampling clock produced from the A/D converting unit in response to an external switching instruction.
REFERENCES:
patent: 4528512 (1985-07-01), Yoshida
patent: 4546322 (1985-10-01), Crutcher
patent: 4949357 (1990-08-01), Sehier
patent: 5163159 (1992-11-01), Rich et al.
patent: 5283780 (1994-02-01), Schuchman et al.
patent: 5440267 (1995-08-01), Tsuda et al.
NEC Corporation
Tse Young T.
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