I'm a new user and I think that SigmaDSPs are a very powerfull tool! I have choosen the ADAU1761 for making a good audio system into a race car. My application needs of amplifier the voice rejecting the very high background noise (130 dB measured!). I have used LPF with HPF or BPF 2nd/4nd/14nd order.. then I used the noise removal algorithm... but the noise is still too much high to output :-(
BTW, the microphone (with noise cancelling feature) works fine because into its output the speech signal is 15/20 dB major then background noise captured... How can I reject this noise into voice band?