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Understanding PDM Digital Audio - University of Texas at ...

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 .. 7. Transmitting and Handling PDM Signals .. 7. Performance .. 8. Conclusion .. 9. Further Reading .. 9. Understanding PDM Digital Audio 2. Introduction 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.

The noise incurred by reducing the wordlength is substantial. (The noise in a 1-bit system is about 90 dB higher than the noise in a 16-bit system, for example.) Noise shaping distributes that noise in a high-pass fashion, but it does not reduce the total noise level. In …

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