Reduced quantization error FIR filter

Details Reduced quantization error FIR filter Reduced quantization error FIR filter

1992-04-21

1993-08-03

Nguyen, Long T.

Boots, shoes, and leggings

G06F 1531

Patent

active

052335496

ABSTRACT:
Apparatus and methods for reducing the quantization error in shift-matrix finite impulse response (FIR) filters (210) operate on a sampled analog signal (11) converted to a sequence of digital signal samples (13). A weight conversion device (23) converts a weight signal W comprising a sequence of tap weights W.sub.i into both a corresponding series of logarithmically-encoded weights W'.sub.i and a series of weight error values .DELTA.W.sub.i. A multiplication device (30) multiplies each of the digital signal samples (13) with the first series of logarithmically-encoded weights W'.sub.i and provides the results to an accumulator (26). A signal encoding device (40) converts the digital signal samples (13) into a sequence of logarithmically-encoded digital signal samples (42). A quantization error correction device (220) multiplies each of the weight error values .DELTA.W.sub.i by the logarithmically-encoded digital signal samples (42) and also provides the results simultaneously to the accumulator (26). The accumulator (26) sums all multiplications provided to it and provides the result as the FIR filter output (28). The apparatus and methods provided by the present invention reduce the quantization error found in shift-matrix FIR filters without sacrificing speed and frequency response.

REFERENCES:
patent: 4691293 (1987-09-01), Conboy
patent: 4782458 (1988-11-01), Bhattacharya
patent: 4805129 (1989-02-01), David
patent: 4809209 (1989-02-01), White
patent: 4811259 (1989-03-01), Costas
patent: 5111419 (1992-05-01), Morley, Jr. et al.
patent: 5170369 (1992-12-01), Rossum

Affiliated with

Also associated with

Rating

Reduced quantization error FIR filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reduced quantization error FIR filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reduced quantization error FIR filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2276928