Multi-rate digital filter apparatus and method for sigma-delta c

Details Multi-rate digital filter apparatus and method for sigma-delta c Multi-rate digital filter apparatus and method for sigma-delta c

1995-12-04

1998-03-24

Hoff, Marc S.

Coded data generation or conversion

Digital code to digital code converters

Data rate conversion

36472401, H03M 700

Patent

active

057317690

ABSTRACT:
Data converter (10, 50, 150, 200) and method (250, 300) operate at variable sampling rates. Input gain stage (12) adjusts input bit stream (18) at an input bit rate (20) to produce gain adjusted bit stream (22). Integrator (14) and comb filter (16) operate on the gain adjusted bit stream (22) to produce a filtered bit stream (28) at an output bit rate (24). The gain of the integrator (14) and comb filter (16) pair varies with the sampling rates implemented. An input gain value of the input gain stage (12) adjusts to compensate for the gain of the integrator (14) and comb filter (16) pair to produce the filtered bit stream (28) within a predetermined dynamic range. DC offset stage (52) and output gain stage (54) provide further adjustment to the filtered bit stream (28). Data converters (10, 50) and method (250) convert data from a higher frequency bit rate to a lower frequency bit rate. Data converters (150, 200) and method (300) convert data from a lower frequency bit rate to a higher frequency bit rate.

REFERENCES:
patent: 4999798 (1991-03-01), McCaslin et al.
patent: 5079734 (1992-01-01), Riley
patent: 5541600 (1996-07-01), Krantz et al.
Multirate Filter Designs using Comb Filters Chu et al. IEEE Trans vol. CAS-31 pp. 913-924 Nov. 1984.

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