Audio_playback_and_record example (STM32F4 Discovery)
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2018-11-28 6:35 PM
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,
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2018-11-28 6:43 PM
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.
Up vote any posts that you find helpful, it shows what's working..
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2018-11-28 8:37 PM
Thank you for your response.
Stm32f4 Discovery boards use one microphone.
I'll look for more data and analyze it.
Thank you.
