Czasopismo | ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA | Rocznik 2011 - zeszyt 5

Text to speech synthesis system with multi voice capability based on instantaneous voice conversion

nr katalogowy: 59597

Although text-to-speech (TTS) synthesis is a quite studied issue, researching and adapting new solutions might be still of some importance. Mobile applications deserve special attention since limitations of their performance and capacity constrains from getting superior synthesis quality. Considerable improvements can be achieved, however, through enhancement of the acoustical database rather than the synthesis itself. Despite the fact that many different techniques have been proposed, segment concatenation is still the major approach to speech synthesis. The speech segments (allophones) are assembled into synthetic speech according to phonetic rules of the spoken language. This process involves time-scale and pitch-scale modifications of allophones in order to produce natural- like sounds. The concatenation can be carried out either in time or frequency domain. Most time domain techniques are similar to the Pitch-Synchronous Overlap and Add method (PSOLA) [1]. The speech waveform is separated into shorttime signals by the analysis pitch-marks (that are defined by the source pitch contour) and then processed and joined by the synthesis pitch-marks (that are defined by the target pitch contour). The process requires accurate pitch estimation of the source waveform. Placing analysis pitch-marks is an important stage that significantly affects synthesis quality. Frequency domain techniques deal with frequency representations of the segments instead of their waveforms what requires prior transformation of the acoustic database to frequency domain. The speech segments are often represented as a sum of periodic (deterministic) and noise (stochastic) components as was introduced in [2]. Regarding speech synthesis this model is a very attractive for the following reasons: . explicit control over pitch, tempo and timbre of the speech; . high-quality segment concatenation can be performed using simple linear smoothing laws; . acousti[...]

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e-Publikacja (format pdf) - nr 59597 "Text to speech synthesis ..." licencja: Osobista Produkt cyfrowy	10.00 zł

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ELEKTRONIKA - KONSTRUKCJE, TECHNOLOGIE, ZASTOSOWANIA - e-zeszyt (pdf) 2011-5 licencja: Osobista Produkt cyfrowy	35.00 zł

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2011-5

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