Understanding PDM Digital Audio - users.ece.utexas.edu
DACs and PCM-to-PDM converters In some commercial DACs, and in systems which convert PCM to PDM, the procedure is slightly different from PDM microphones. The signal has already been sampled at a low rate, and is in PCM form. To achieve the high sampling rate needed for noise shaping to be effective, the signal must first be interpolated.
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