Window Function

Window Function is one of the steps to perform Speech Analysis

Speech wave must be multiple by an apporpriate time window when we extract N-sample interval from speech wave for calculating most processing on speech.

It has two effects :

1. it gradually attenuates the amplitude at both ends of the extraction interval to prevent an abrupt change at the endpoints.
2. it produces the convolution for the fourier transform of the window function and the speech spectrum.

Several compromise window functions have been proposed:

the Hamming window is usually used for speech analysis is defind as

Hanning window and Rectangular window