Methods and apparatus for look-ahead block processing in...

Details Methods and apparatus for look-ahead block processing in... Methods and apparatus for look-ahead block processing in...

2011-01-11

2011-01-11

Williams, Howard (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S076000

Reexamination Certificate

active

07868801

ABSTRACT:
Methods and apparatus are provided for look-ahead block processing in predictive delta-sigma modulators. An input signal is quantized using a predictive delta-sigma modulator by generating error prediction values for a current block of input values based on a linear combination of error prediction values from one or more previous blocks, input values of one or more previous blocks, quantized values of one or more previous blocks and the current block of input values; computing speculative error prediction values for at least one input value in the current block, wherein the speculative error prediction values are computed for a plurality of possible quantizer output values; selecting one of the speculative error prediction values based on a quantized value from the current block; and subtracting the error prediction values for the current block from the corresponding current block of input values.

REFERENCES:
patent: 6115726 (2000-09-01), Ignjatovic
patent: 6232899 (2001-05-01), Craven
patent: 6600788 (2003-07-01), Dick et al.
patent: 2005/0162285 (2005-07-01), Melanson
patent: 2005/0162286 (2005-07-01), Melanson

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