Electronics Project:Sound Denoising

  Implementation of sound denoising algorithm:

Removing noise from audio signals requires a non-diagonal processing of time-frequency coefficients to avoid producing “musical noise.” Audio signals are often contaminated by background environment noise and buzzing or humming noise from audio equipments. Audio denoising aims at attenuating the noise while retaining the underlying signals. Applications such as music and speech restoration are numerous.

This sound denoising algorithm is based on the popular spectral subtraction technique. Based on the spectrum of the vuvuzela sound, this denoising technique simply computes an attenuation map in the time-frequency domain. Then, the audio signal is restored by computing the inverse STFT (Short Time Fourier Transform).