Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Reexamination Certificate
2007-12-11
2007-12-11
Nguyen, Khai M. (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
C341S144000, C341S152000
Reexamination Certificate
active
11315549
ABSTRACT:
A signal processing system matches, within a band of near out-of-band frequencies, the frequency response trends of a delta sigma modulator noise transfer function (NTF) and frequency response trends of a low pass finite impulse response (FIR) filter to provide noise attenuation in in-band frequencies and near out-of-band frequencies. More specifically, in at least one embodiment, the signal processing system matches, within the band of near out-of-band frequencies, a gradient trending toward increasing energy as the near out-of-band frequencies increase of the NTF with a gradient trending toward increasing attenuation by a FIR filter to improve attenuation of near out-of-band energy in an output signal of the signal processing system. Operation of the delta sigma modulator generates near out-of-band noise. Improving attenuation of the near out-of-band energy helps prevent the near out-of-band energy from being modulated into in-band frequencies, i.e. frequencies of a signal of interest.
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Chambers Kent B.
Cirrus Logic Inc.
Hamilton & Terrile LLP
Nguyen Khai M.
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