The Pitch Mode Modulation Model and Its Application in Speech Processing

The techniques currently used for speech coding or enhancement critically depend upon some form of statistical stationarity either in the speech signal the noise signal or both in order to accomplish the coding or enhancement. Virtually all speech processing techniques utilize a speech model to reduce the amount of information necessary to characterize the speech signal. Although the speech signal is known to be highly redundant it is also non-stationary. This non-stationarity requires that the parameters of these models be extracted from short duration signal segments, where the stationarity assumption in the models is not seriously violated. Unfortunately the use of short speech frames makes the estimation of the model parameters difficult and sometimes obscures the very redundancy the model was based on. The use of a longer frame size is desirable for many signal processing techniques that require increased frequency domain resolution.

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