Understanding PDM Digital Audio
Understanding PDM Digital Audio Thomas Kite, VP Engineering Audio Precision, Inc. Table of Contents Introduction ........................................ ........................................ ........................................ ...................... 3. Quick 3. PCM ........................................ ........................................ ........................................ ................................... 3. Noise 4. Oversampling ........................................ ........................................ ........................................ .................... 5. PDM Microphones ........................................ ........................................ ........................................ ........ 6. DACs and PCM-to-PDM 6. PDM Modulators.
PDM stands for pulse density modulation. However, it is really better summarized as “oversampled 1-bit audio”, as it is nothing more than a high sampling rate, single-bit digital system. If one increased the sample rate of audio CDs by a large factor, and reduced the wordlength from 16 bits to 1 in a reasonable
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