Method and apparatus for interpolation and noise shaping in a si

Details Method and apparatus for interpolation and noise shaping in a si Method and apparatus for interpolation and noise shaping in a si

1995-08-07

1997-02-25

Gaffin, Jeffrey A.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341143, 341 61, 3647241, H03M 166

Patent

active

056063199

ABSTRACT:
A D/A converter (10) converts a digitized analog signal (32) to an analog signal (50). The D/A converter (10) includes first filtering stage (12), second filtering stage (14), and reduced-bit D/A converter (16). The first filtering stage (12) operates at a first sampling rate (25), interpolates the digitized analog signal (32) from an initial sampling rate to a first sampling rate (25), performs an anti-alias filter, and performs a first comb filtering function. The second filtering stage (14) operates at a second sampling rate (46), interpolates the digitized analog signal (32) to the second sampling rate (46), performs a second comb filtering function, and performs a noise shaper filter to produce a reduced-bit second sampling rate signal (48). The reduced-bit D/A converter (16) converts the second sampling rate signal (48) to an analog signal (50).

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