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. 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 way, that would serve as the basis of a PDM system.
DACs and PCM-to-PDM converters In some commercial DACs, and in systems which convert PCM to PDM, the procedure is slightly different from PDM microphones. The signal has already been sampled at a low rate, and is in PCM form. To achieve the high sampling rate needed for noise shaping to be effective, the signal must first be interpolated.
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