• 한국음향학회:학술대회논문집
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• 한국음향학회 1991년도 학술발표회 논문집
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• pp.7-10
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• 1991

In a text-to-speech system, sound units (phonemes, words, or phrases, etc.) can be concatenated together to produce required utterance. The quality of the resulting speech is dependent on factors including the phonological/prosodic contour, the quality of basic concatenation units, and how well the units join together. Thus although the quality of each basic sound unit is high, if occur the discontinuity in the concatenation part then the quality of synthesis speech is decrease. To solve this problem, a smoothing operation should be carried out in concatenation parts. But a major problem is that, as yet, no method of parameter smoothing is available for joining the segment together. Thus in this paper, we proposed a new aigorithm that smoothing the unnatural discountinuous parts which can be occured in speech waveform editing. This algorithm used the exponential smoothing method.

• 대한음성학회지:말소리
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• 제56호
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• pp.225-235
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• 2005

Speech unit concatenation with a large database is presently the most popular method for speech synthesis. In this approach, the mismatches at the unit boundaries are unavoidable and become one of the reasons for quality degradation. This paper proposes an algorithm to reduce undesired discontinuities between the subsequent units. Optimal matching points are calculated in two steps. Firstly, the fullback-Leibler distance measurement is utilized for the spectral matching, then the unit sliding and the overlap windowing are used for the waveform matching. The proposed algorithm is implemented for the corpus-based unit concatenating Korean text-to-speech system that has an automatically labeled database. Experimental results show that our algorithm is fairly better than the raw concatenation or the overlap smoothing method.

• 한국음향학회:학술대회논문집
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• 한국음향학회 1991년도 학술발표회 논문집
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• pp.15-20
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• 1991

In a text-to-speech system, sound units (e. q., phonemes, words, or phrases) can be concatenated together to produce required utterance. The quality of the resulting speech is dependent on factors including the phonological/prosodic contour, the quality of basic concatenation units, and how well the units join together. Thus although the quality of each basic sound unit is high, if occur the discontinuity in the concatenation part then the quality of synthesis speech is decrease. To solve this problem, a smoothing operation should be carried out in concatenation parts. But a major problem is that, as yet, no method of parameter smoothing is availalbe for joining the segment together.

• 한국음향학회지
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• 제21권3호
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• pp.285-292
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• 2002

문자-음성 합성기 (Text-To-Speech, TTS)에서 해결되어야 할 문제점 중의 하나는 음소의 연결 부위에서 발생하는 불연속성이다. 이러한 문제점을 해결하기 위한 방안으로 본 논문에서는 저역 여파기를 이용한 스무딩 기법을 적용하였다. 제안된 스무딩 기법은 스무딩의 정도를 제어하는 필터 계수를 현재 합성하고자 하는 문맥에 따라 결정하여, 경계에서의 불연속성을 효과적으로 제거하고 스무딩으로 인하여 발생할 수 있는 음성의 왜곡을 억제하였다. 스무딩 정도는 현재 합성된 음성의 불연속 정도와 주어진 문맥으로부터 예측된 불연속 정도를 통해 결정하였으며, 문맥으로부터 불연속 정도의 예측은 음소 정보를 입력, 불연속 값을 출력으로 하는 CART(Classification And Regression Tree)를 통해 이루어진다. 제안된 기법의 성능 평가를 위해 코퍼스 기반 연결(corpus-based concatenative) 문자-음성 합성기를 기본 시스템으로 사용하였으며, 청취 테스트에서 60%이상 의 청취자가 제안된 스무딩 기법을 통해 합성된 음성이 스무딩 기법이 사용되지 않은 경우와 비교하여 명료성과 자연성 면에서 우수하다고 판단하였다.