Decimation filter as for a sigma-delta analog-to-digital convert

Details Decimation filter as for a sigma-delta analog-to-digital convert Decimation filter as for a sigma-delta analog-to-digital convert

1989-05-12

1991-06-25

Shaw, Dale M.

Boots, shoes, and leggings

G06F 1531

Patent

active

050273060

ABSTRACT:
A single stage multi-rate finite impulse response filter is used as the decimating filter for a sigma-delta analog-to-digital converter. The filter uses 2048 22-bit coefficient values to produce a sampled data output signal having a sampling rate of 48 KHz and a sample resolution of 16 bits from an input signal having a sampling rate of 3.072 MHz and a sample resolution of one bit. The filter uses a single read-only memory to hold the 2048 coefficient values. The coefficient values are distributed to eight four-way multiplexed accumulators by a circuitry which includes a signal multiplexer and a barrel shifter. The accumulators use unsigned arithmetic to calculate the output sample values. A value C0, representing a normalizing offset and gain applied to each of the coefficient values, is selected such that 2048 times C0 is a value which overflows the accumulator, leaving a value of zero in the accumulator.

REFERENCES:
patent: 4323980 (1982-04-01), Houdard et al.
patent: 4811262 (1989-03-01), White
patent: 4866648 (1989-09-01), Usui
Hauser et al, Feb. 13, 1989, MOS ADC-Filter Combination That Does Not Require Precision Analog Components.
Hauser and Brodersen, 1988, Monolithic Decimation Filtering for Custom Delta-Sigma A/D Converters.
He et al, 1988, Multi-Loop Sigma-Delta Quantization: Spectral Analysis.
Ardalan, 1988, Analysis of Delta-Sigma Modulators with Bandlimited Gaussian Inputs.
Naus and Dijkmans, Mar. 1988, Low Signal-Level Distortion in Sigma-Delta Modulators.
Motorola Inc., 1989, DSP56ADC16 16-Bit Sigma-Delta Analog-to-Digital Converter.
Crystal Semiconductor Corporation, Oct. 1988, CS5326 16-Bit Stereo A/D Converter for Digital Audio.
E. Stikvoort, Mar. 1988, Higher Order One Bit Coder for Audio Applications.
Jon Dattorro, 1988, The Implementation of Recursive Digital Filters for High-Fidelity Audio.
Welland et al., Nov. 1988, A Stereo 16-Bit Delta-Sigma A/D Converter for Digital Audio.
Crochiere and Rabiner, Multirate Digital Signal Processing.
Darling and Hawksford, Nov. 1988, Oversampled Analogue to Digital Conversion for Digital Audio Systems.
Spang, III and Schultheiss, Dec. 1962, Reduction of Quantizing Noise by Use of Feedback.
Uchimura et al, 1988, Oversampling A-to-D and D-to-A Converters with Multi-Stage Noise Shaping Modulators.
Robert W. Adams, Mar. 1985, Design and Implementation of an Audio 18 Bit Analog-to-Digital Converter Using Oversampling Techniques.
Boser and Wooley, 1988, The Design of Sigma-Delta Modulation Analog-to-Digital Converters.

Affiliated with

Also associated with

Rating

Decimation filter as for a sigma-delta analog-to-digital convert does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Decimation filter as for a sigma-delta analog-to-digital convert, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decimation filter as for a sigma-delta analog-to-digital convert will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1045594