SOLA based on Zero-Crossing Point

High quality time scale modification of signals is important in many applications. The difficulty is to achieve the necessary time scale modification yet maintaining the pitch information presented in the input signal. We presented a new, computationally efficient algorithm called SOLA (synchronized overlap and add) based on zero-crossing point. It is a time domain algorithm. The algorithm can provide a high quality output signal, and provides an order of magnitude improvement in processing speed when compared to the most popular method, SOLA (Roucos and Wilgus, 1985)