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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.

Noise modulation is the undesirable variation of the noise floor in a system due to the signal content. PCM Before we tackle PDM, let’s first review PCM, that is, conventional multi-bit digital audio. In PCM, the audio signal is represented as a series of samples, each a fixed number of bits long. Two factors determine the performance of the ...

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