Method of pitch smoothing based on exponential weighting
Baochen Jiang · Jisuanji gongcheng yu sheji · 2006
A method of pitch smoothing for unit segments is presented. In speech synthsis based on waveform concatenative synthesis,time domain pitch synchronous overlap add (TD-PSOLA) algorithm is often used to modify pitch and duration. However, conventionalTD-PSOLA algorighm works on whole segment in pitch smoothing, it is still poor to resolve discontinuity between unit segment, parti-cularly at the joint. Because the unit is selected from different context corpus, so it is felt obviously that discontinuous pitch appears asif synthetic speech comes from different intonation. Smooth pitch is tried to smooth according to context by weighting exponential functionon each-frame splitted by pitch mark. The listenning test shows that this method well resolve discontinuity problem at the joint.