Understanding PDM Digital Audio

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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 Microphones A PDM microphone, also called a digital microphone, consists of the following parts: • A microphone element. Typically this is an electret capsule. • An analog preamplifier. • A PDM modulator. • Interface logic. The analog signal from the microphone element …

  Electret, Microphone