Fast SOLA-based time scale modification using Modified Envelope Matching

Time scale modification (TSM) of speech and audio is useful in many applications. Synchronized Overlap-and-Add (SOLA) is a time-domain TSM algorithm known to achieve good speech and audio quality. One problem of SOLA is that it requires a large amount of computation. In this paper, we propose a technique called Modified Envelope-Matching TSM (MEM-TSM) to simplify the computation. The. MEM-TSM improves the previously proposed EM-TSM in quality and speed up factor. The proposed algorithm can reduce computation by 300 times with good perceptual quality of time-scaled speech and audio. Our experimental results show that the quality of MEM-TSM is almost the same as SOLA.