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2. ENGINEERING AND TECHNOLOGY
The Paola algorithm, is an efficient algorithm for the time scale modification of speech. It uses a simple peak alignment technique to synchronise synthesis frames and takes waveform properties and the desired time-scale factor into account to determine optimum alogrithm parameters. However, PAOLA has difficulties with certain waveform types and can result in poor synchronisation for subband implementations. SOLA is a less efficient algorithm but resolves the issues associated with PAOLA's implementation. The authors present an algorithm that is a combination of the two approaches that proves to be an efficient and effective algorithm for a subband implementation.
Dorran, D. & Lawlor, R. (2003) An efficient audio time-scale modification algorithm for use in a subband implementation. International Conference on Digital Audio Effects, London, England, 2003,