Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2006-08-01
2006-08-01
Barnie, Rexford (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S144000
Reexamination Certificate
active
07084798
ABSTRACT:
A signal processing system includes a look-ahead delta sigma modulator having an approximation generator to approximate quantizer input signals. A look-ahead delta-sigma modulator can be implemented as a noise shaping filter and a quantizer. The quantizer can be implemented as a function generator. State variables of the noise shaping filter provide the input data from which the function generator determines a quantizer output signal. Latter state variables are more dominant in determining the quantizer output signal. Accordingly, earlier state variables can be approximated to a greater degree than earlier state variables. The approximations can result in slightly lower output signal accuracy but can significantly decrease implementation cost. Additionally, latter state variables can completely dominate (i.e., be deterministic) the quantizer output signal. This situation can result in a further, slight increase in the non-linearity of one or more quantization region boundaries.
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Barnie Rexford
Chambers Kent B.
Cirrus Logic Inc.
Hamilton & Terrile LLP
Lauture Joseph
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