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MP34DT01 noise issue

Question asked by Jasper sun on Sep 21, 2017

I'm using MP34DT01 MIC ,but i found that the niose is extremely large.

My mcu is STM32F429VGT6,using its I2S peripheral.

I use  libPDMFilter_IAR library convert  PDM signal to PCM signal.but there is a large amount of white noise.

A group of sample data is in the attachment.(PDM data read from the mic in quiet environment)

Is these sample data correct?

 

Can you give me some advise? 

 

 

if you know Chinese--

我最近使用一颗ST的MEMS MIC芯片,型号是MP34DT01,但是测试发现有非常大的白噪声.

我用的MCU是STM32F429,通过I2S读取MIC的PDM信号并且用stm32f407discovery附带的一个例程里面的

软件库转成PCM信号输出。

附件是抓的一组在安静环境下MIC输出的PDM数据,这些数据看起来正常吗?

 

Jasper

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