Apparatus for varying a sampling rate in a digital demodulator

Details Apparatus for varying a sampling rate in a digital demodulator Apparatus for varying a sampling rate in a digital demodulator

1996-12-30

1999-09-21

Pham, Chi H.

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

371 51, 4551642, 375344, H04L 2706

Patent

active

059563761

ABSTRACT:
A framing and voice decoder part outputs an error information. An error ratio monitoring part monitors a bit error ratio based on the error information. A sampling rate changing part decides a sampling rate based on the bit error ratio and changes a number of bits of each shift register in the differential detector part to adapt the sampling rate. A sampling clock selector part selects one clock signal among four different frequency clock signals based on the decision of the sampling rate changing part and gives selected clock signal to the differential detector part as a sampling clock. The differential detector part makes demodulation in DQPSK (Differential Quadrilateral Phase Shift Keying). Since the error ratio is always maintained within a predetermined extent, a good voice quality is obtained. Since the sampling rate will not increase to unnecessarily high levels, power saving can be achieved and a consumption of batteries is reduced.

REFERENCES:
patent: 4028626 (1977-06-01), Motley et al.
patent: 4514697 (1985-04-01), York
patent: 4704582 (1987-11-01), Dixon et al.
patent: 4788696 (1988-11-01), Sakane et al.
patent: 4991184 (1991-02-01), Hashimoto
patent: 4998264 (1991-03-01), Woodward
patent: 5157694 (1992-10-01), Iwasaki et al.
patent: 5280538 (1994-01-01), Kataoka et al.
Electronics Information and Communication Association Fall 1990 National Conference, Satoshi Denno et al., NTT Radio Communication Systems Laboratories.

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