Issue to hear recorded sound with stm32f4 discovery board

[mohit rai]

Posted on September 02, 2017 at 08:12

Hello, I am trying to store sound wave using analog mic using stm32f4 discovery board. external mic--> adc-->dac-->codec--->headphone.

When I am trying to play recorded sound using codec, I am not able to hear recorded sound . can any one help me?

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[mohit rai]

Posted on September 08, 2017 at 07:31

hello ,

I have connected ADC pin to ground but 5.4khz,4,5khz and 2.5khz frequency component is present in my output.

sampling frequency=48khz, and different cutoff frequency coefficient I have used, but noise is present.

I am using CMSIS lib function for LPF (arm_fir_f32) . I have generated frequency coefficient using matlab.

[mohit rai]

Posted on September 08, 2017 at 07:33

cutoff frequency that I have used are 1khz,2,khz,3khz,4khz and 5khz.but there is no change in my output.