| 摘要 |
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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