METHOD AND APPARATUS FOR DETERMINING PITCH SYNCHRONOUS FRAMES
In a speech processing system, an optimal filter frequency is determined and used to filter an unfiltered signal. The optimum filter is chosen by passing the largest voice area greater than 50ms through multiple filters. The average energy output for each filter and differences between the filter averages (DeltaEnergy) are calculated. The first peak in DeltaEnergy above the average DeltaEnergy determines the optimal filter for filtering the signal. The filtered signal is divided into segments and voiced periods are determined. The unfiltered signal is divided into pitch synchronous frames based on the filtered signal.