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slee.121
slee.121
Associate
November 29, 2018
Question

Audio_playback_and_record example (STM32F4 Discovery)

  • November 29, 2018
  • 2 replies
  • 876 views

Hi.

First , I'm not good at English.​

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I am testing an example of Audio_palyback_and_recorder of STM32f4 Discovery.

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In the i2S setting of the microphone,

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

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Why did you multiply 2?

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

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​Thank you.

Best regards,

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    This topic has been closed for replies.

    2 replies

    Tesla DeLorean
    Tesla DeLorean
    Guru
    November 29, 2018

    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.

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    slee.121
    slee.121Author
    Associate
    November 29, 2018

    Thank you for your response.

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    Stm32f4 Discovery boards use one microphone.

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    I'll look for more data and analyze it.

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    Thank you.

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