Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2007-01-23
2007-01-23
Barnie, Rexford (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S144000
Reexamination Certificate
active
11297016
ABSTRACT:
A centered-pulse consecutive edge modulation (CEM) method and apparatus provides a pulse output that advantageously exploits the full edge update rate of the CEM while providing substantially centered pulses. The method and apparatus also operate without substantial delay in the input control path. The apparatus includes a delta-sigma noise shaping modulator followed by a CEM that receives an output of the delta-sigma modulator quantizer. A non-linear correction signal is applied with polarity alternating at each edge and is applied to the quantizer input or is designed into the quantizer transfer function. The non-linear correction signal compensates for the noise-shaping modulator output such that the expected rising edge and falling edge widths of the CEM output pulses are substantially equal with respect to a DC input to the delta-sigma modulator.
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Hagge Melvin L.
Melanson John L.
Trotter Brian David
Barnie Rexford
Cirrus Logic Inc.
Harris Andrew M.
Lauture Joseph
Mitch Harris Atty at Law, LLC
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