Audio_playback_and_record example (STM32F4 Discovery)

[slee.121]

Hi.

First , I'm not good at English.​

I am testing an example of Audio_palyback_and_recorder of STM32f4 Discovery.

In the i2S setting of the microphone,

hAudioInI2s.Init.AudioFreq = 2 * AudioFreq; where, AudioFreq = 16K

Why did you multiply 2?

And how do you decide the size of the PCM data buffer after converting the PCM from PDM?

​Thank you.

Best regards,

[Tesla DeLorean]

Is that how it deals with paired stereo samples? You'd likely want to look at how the Codec (manual/datasheet) describes frequencies and data sizes, and how they interrelate.

[slee.121]

Thank you for your response.

Stm32f4 Discovery boards use one microphone.

I'll look for more data and analyze it.

Thank you.