Methods and apparatus for decorrelating quantization noise...

Details Methods and apparatus for decorrelating quantization noise... Methods and apparatus for decorrelating quantization noise...

2009-03-31

2010-11-16

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S155000

Reexamination Certificate

active

07834788

ABSTRACT:
Methods and apparatus are provided for decorrelating quantization noise in a delta-sigma modulator. An input signal is quantized using a predictive delta-sigma modulator, by quantizing the input signal using a quantizer; determining a quantization error associated with the quantizer by subtracting an input to the quantizer from an output of the quantizer; measuring a correlation coefficient between the quantization error and an input to the quantizer; reducing the measured correlation by subtracting a multiple of the input to the quantizer from the quantization error, wherein the multiple is based on the correlation coefficient; generating an error prediction value using an error predictive filter; and subtracting the error prediction value from the input signal.

REFERENCES:
patent: 5959562 (1999-09-01), Wiesbauer
patent: 2009/0041367 (2009-02-01), Mansour

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