Digital signal processing type demodulation method and demodulat

Details Digital signal processing type demodulation method and demodulat Digital signal processing type demodulation method and demodulat

1989-05-22

1991-12-17

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329311, H03D 100, H04L 2706

Patent

active

050739042

ABSTRACT:
Disclosed is a digital demodulation technique in which a reception modulated-wave signal is converted into a digital signal in synchronism with a sampling frequency, whereafter carrier regeneration/detection is carried out upon the digital signal to thereby output a detection signal. Then, the detection signal is subject to interpolation and resampling on the basis of a clock frequency established asynchronously with and independently of the sampling frequency, so that a timing component is extracted from the detection signal in synchronism with the clock frequency to thereby output a reception data. In the digital demodulation technique, since the sampling frequency and the clock frequency are established asynchronously with and independently of each other, jitter or the like produced in clock regeneration do not affect the carrier regeneration/detection. Consequently, noiseless reception data with little jitters can be regenerated.

REFERENCES:
patent: 4794341 (1988-12-01), Barton et al.
Hideo Suzuki, et al., "Modem and FEC LSIs for Small Earth Stations", Lecture No. 2325, Collection of Papers in 1987 All Japan Meeting of the Institute of Electronics, Information and Communication Engineers of Japan.
"Application of Digital Signal Processing", Third Edition, the Institute of Electronics and Communication Engineers of Japan, Jul. 10, 1983, Chapter 6, p. 169.

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