AnsweredAssumed Answered

How to fix my DMIC interface data ?

Question asked by James Whitney on Apr 15, 2019
Latest reply on Apr 17, 2019 by James Whitney

Greetings,

I now have a DMIC project running on a LPCXpresso54114 *without* the MAO shield, i.e., I go directly into the DMIC interface. I am able to capture and store data. The problem is the data will go from i.e., very low values during silence to almost 'FFFF' (its decimal equivalent) instantaneously *STILL DURING SILENCE*.

2
4
5
3
3
0
65533
65530
65530
65530
65531
65530

65533
65535
0
1
1
2
3

 

The 'true' values seem to reflect the conditions of the acquisition environment, i.e., during silence (DMIC covered with several layers of absorber) the values are very small single/double digits. During, i.e., speech can see higher amplitude values and some modulation.

Would like to get some insight on what might be causing this, and how to fix it.

Regards,

Jim

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