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Hello, I am  a student from Korea. I am trying to use a on board mic at nexys 4 ddr product. The final goal is to get noise level (such as 80dB).

I have problems about understanding pdm modulation which is at page.24 of below pdf file. First of all, I thought I could get the noise level via couting each pdm signal occurs while a one clock pusle(if clock is 3Mhz timing will be 1/3 ns). But I'm not sure this is true. Even if it is true, I cannot find exact counting time to seek exact noise level.

Can you help me with how to use on board mic as noise level? (via pdm modulation) I am using verilog.

Hope your reply.

Thanks.

nexys4ddr_rm.pdf

Edited by Joon Hong
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