Methods and apparatus for whitening quantization noise in a...

Details Methods and apparatus for whitening quantization noise in a... Methods and apparatus for whitening quantization noise in a...

2011-01-11

2011-01-11

Williams, Howard (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Increasing converter resolution

C341S143000

Reexamination Certificate

active

07868798

ABSTRACT:
Methods and apparatus are provided for whitening quantization noise in a delta-sigma modulator using a dither signal. An input signal is quantized using a predictive delta-sigma modulator by quantizing the input signal using a quantizer; adding a dither signal at a first location of the predictive delta-sigma modulator; determining a quantization error associated with the quantizer; removing the dither signal at a second location of the predictive delta-sigma modulator (for example, by subtracting a substantially similar version of the dither signal at the second location); generating an error prediction value using an error predictive filter; and subtracting the error prediction value from the input signal. The dither signal may be a white noise signal and may optionally be generated using a pseudo-random number generator.

REFERENCES:
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patent: 5818376 (1998-10-01), Bianchessi et al.
patent: 7411534 (2008-08-01), Melanson
patent: 06077824 (1994-03-01), None
Gerzon et al., Optimal Noise Shaping and Dither of Digital Signal: Audio Engineering Society; 87th Convention of the AES, Oct. 1989, pp. 1-20.

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