Audio Codec - Input FTT

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This example shows how to use the FFT class to calculate the fast Fourier transform of the audio signal recorded by the microphone.

Daphne

1

Setup

As RTL8722DM MINI have a built in microphone on the board, there is no need for any external microphone.

Next, Open the example, “Files” -> “Examples” -> “AmebaAudioCodec” -> “InputFFT”.
2

Final

Upload the code and press the reset button on Ameba once the upload is finished.
Open the serial monitor and change the baud rate to 2000000. A stream of FFT results of audio samples will be displayed. Try playing music or use a smartphone app to generate a sine wave into the microphone, and you should be able to see the FFT output change.

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