digital filer - PDM to PCM conversion

jae woo so

Other Parts Discussed in Thread: TMS320F28335

I use TMS320F28335 to interface digital microphone.

How to it interface to PDM from PCM with microphone. I guess that PDM data from microphone will be obtained with I2C of TMS320F28335.

next, I don't know PDM to PCM conversion(digital filter). Do anyone give some source code or library to me?????

over 12 years ago

0 Gautam Iyer over 12 years ago

Guru 192875 points

Hi Jae,

You'll have to design a decimation filter for this purpose. There are few filter libraries available for F28335. I guess you'll have to modify them according to your requirement.

Please go through this doc for in depth info on PDM to PCM conversion (Page 8)

http://users.ece.utexas.edu/~bevans/courses/realtime/lectures/10_Data_Conversion/AP_Understanding_PDM_Digital_Audio.pdf

Regards,

Gautam

0 jae woo so over 12 years ago in reply to Gautam Iyer

Intellectual 255 points

Do have anyone sample code???

0 Gautam Iyer over 12 years ago in reply to jae woo so

Guru 192875 points

Nope Jae, don't have one. You'll have to design it yourself according to your requirement.

Regards,

Gautam

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digital filer - PDM to PCM conversion