Transcription of Understanding PDM Digital Audio - users.ece.utexas.edu
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Understanding PDM Digital Audio - users.ece.utexas.edu
Understanding PDM Digital Audio Thomas Kite, VP Engineering Audio Precision, Inc. Understanding PDM Digital Audio 2 Table of Contents Introduction .. 3 Quick Glossary .. 3 PCM .. 3 Noise Shaping .. 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 3 Introduction PDM stands for pulse density modulation.
Most current digital audio systems use multi-bit PCM (pulse code modulation) to represent the signal. PCM has the advantage of being easy to manipulate. This allows signal processing operations to be performed on the audio stream, such as mixing, filtering, and equalization.
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