I am currently following the thread on this git repo: https://github.com/wady101/PYNQ_Z2-Audio/issues/1 . In this repo there is a modified version of Pynq where I can get directly the audio stream, but I have found that is encoded as PDM, whereas I need PCM encoding. Is there a way to have a conversion to PCM? I have tried to use a lowpass filter but is not working, so I am trying to implement manually a sinc3 filter but it seems not working. Here is the code:
k = 0 for i in range(0, len(self._input_signal)): if self._input_signal[i] == 1: self._acc1 = self._acc1 + 1 self._acc2 = self._acc2 + self._acc1 self._acc3 = self._acc3 + self._acc2 if i == (self._decimation_factor-1)*(k+1): self._diff1 = self._acc3 - self._acc3_d2 self._diff2 = self._diff1 - self._diff1_d self._diff3 = self._diff2 - self._diff2_d self._acc3_d2 = self._acc3 self._diff1_d = self._diff1 self._diff2_d = self._diff2 self._data[k] = self._diff3 k = k + 1 return self._data
Do you have any suggestions?
Thanks in advance,