What is PDM format?
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‎2017-03-17 09:25 AM
Hello,
I want to use MP34DT01 microphone in our application. But data stream format is unclear. Explain this please. I guess this is the usual delta modulation. Is not it? Analog Devices for ADMP521 was describe it transparently.
Thanks in advance.#pdm #microphone #mems-microphone- Labels:
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Audio
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Microphones
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‎2017-04-21 04:46 AM
A form of modulation using which an Analog signal is represented by a Binary signal.
If you are familiar with PCM where magnitude is used to represent Analog signal, in case of PDM relative density is used
Go through the links
http://keystrokecountdown.com/articles/PDMPlayground/index.html
https://www.theunterminatedstring.com/probing-pdm/
http://renesasrulz.com/renesas_forum_home/rl78/f/the-rl78-forum/5890/mems-microphone-pdm-decoding
Regards
Farhan
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‎2017-07-22 11:12 PM
Thank you Farhan for references. As I was understand MP34DT01 is functional equivalent of ADMP521, is not it?
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‎2018-03-30 01:40 AM
Yes. Both IC's provide output in PDM format and MP34DT01 can be used to replace ADMP521.