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audio-fft's Introduction

Real-Time Audio FFT

Performs Real-Time FFT of audio input signal from the on-board MP45DT02 MEMS microphone. The input audio data and its FFT data are multiplexed on the left and right channels respectively. This data is then streamed over serial port. We use the USB CDC Virtual COM Port stack for serial communication. The raw data can be directly stored to a file and imported in a tool like Audacity for analysis or you can use the accompanied utility which plots this data realtime using WebSockets.

Waveforms
500Hz Audio Signal Music Signal
500Hz Audio Music

Specs

  • Processor Frequency = 168MHz
  • Audio Sampling Rate = 8KHz
  • Sampling Resolution = 16bit
  • FFT Sample Size = 512

Source

To store serial data to a file on windows use the command -

type com9: >> output.pcm

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