MP34DT01 noise issue

[Jasper sun]

Posted on September 21, 2017 at 11:59

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ç�?¨ä¸€é¢—STçš„MEMS MIC芯片，型å�·æ˜¯MP34DT01，但是测试å�‘现有é�žå¸¸å¤§çš„白噪声.

我ç�?¨çš„MCU是STM32F429，通过I2S读å�–MICçš„PDMä¿¡å�·å¹¶ä¸�?ç�?¨stm32f407discovery附带的一个例程里é�¢çš„

软件库转�PCM信�输出。

附件是抓的一组在安�环境下MIC输出的PDM数�，这些数�看起�正常�？

Jasper