Distortions in speech enhancement due to block processing

In most speech enhancement algorithms, a frequency response is computed per each block, and a multiplication in the frequency domain is used to apply this frequency response. Typically, in these algorithms, the updating procedure cannot ensure the fulfillment of the condition to perform a linear convolution instead of a circular convolution. As a result, artifacts and distortions may be present. Standard methods to deal with these distortions use overlapping and windowing. This work presents a detailed analysis of these distortions and proposes a new method to perform a artifact-free and distortion-free convolution in the FFT domain.