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X-CUBE-AUDIO (using stm32cubeIDE) : Mono input problem in MP3 en/decoder Target B'd : STM32469I-Discovery

SKim.22
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STM32CubeExpansion_Audio_V1.1.1 (Audio_MP3 project using stm32cubeIDE)

I am trying to use mp3 en/decoder using mono input(microphone).

mp3 encoder problem:

When playing mp3 encoded files on a PC, only noise comes out.

mp3 decoder problem:

Decoder cannot play mp3 mono files. ("Error: only stereo audio input is supported.")

The datasheet says that it also supports mono mode. What should I do?

Please explain in detail.

Thank you.

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