Frequency filtering method using a Wiener filter applied to noise reduction of audio signals

摘要

The noisy signal is converted into the frequency domain by Fourier analysis (1). A model is created of the noise (2) and estimates made of the spectral density, energy level and the conversion coefficient for statistical dispersion. In parallel to this similar estimates are made of the noisy signal (3). The two results are then recombined in a Wiener filter (4) which compensates for energy levels and applies noise overestimation. The signal is then reconstructed (5).