- 著者
- Fumiaki Taguchi Sadao Hiroya Yasufumi Uezu Takemi Mochida
- 出版者
- ACOUSTICAL SOCIETY OF JAPAN
- 雑誌
- Acoustical Science and Technology (ISSN:13463969)
- 巻号頁・発行日
- vol.41, no.5, pp.800-803, 2020-09-01 (Released:2020-09-01)
- 参考文献数
- 19
- 被引用文献数
- 1
- 著者
- Yasufumi Uezu Sadao Hiroya Takemi Mochida
- 出版者
- ACOUSTICAL SOCIETY OF JAPAN
- 雑誌
- Acoustical Science and Technology (ISSN:13463969)
- 巻号頁・発行日
- vol.41, no.5, pp.720-728, 2020-09-01 (Released:2020-09-01)
- 参考文献数
- 30
- 被引用文献数
- 2
Auditory feedback has a crucial role in stably controlling speaking and singing. Formant-transformed auditory feedback (TAF) is used to investigate the relationship between perturbation to the formant frequency and the compensatory response to clarify the mechanism of auditory-speech motor control. Although previous studies for formant TAF applied linear predictive coding (LPC) to estimate formant frequencies, LPC estimates false formants for high-pitch voice. In this paper, we investigate how different vocal-tract spectrum estimation methods in real-time formant TAFs affect the compensatory response of formant frequencies to perturbations. A phase equalization-based autoregressive exogenous model (PEAR) is applied to the TAF system as a formant estimation method that can estimate the formant frequency more accurately and robustly than LPC can. Fifteen Japanese native speakers were asked to repeat the Japanese syllables /he/ or /hi/ while receiving feedback sounds whose formants F1 and F2 were transformed. From the results for the /he/ condition, the F1 compensatory response for PEAR was significantly larger than that of LPC, and the compensation error in the F1–F2 plane for PEAR was less than that for LPC. Our results suggest that PEAR can increase both the accuracy of formant frequency estimation and the naturalness of the transformed speech sound.
- 著者
- Hiroki Oohashi Sadao Hiroya Takemi Mochida
- 出版者
- ACOUSTICAL SOCIETY OF JAPAN
- 雑誌
- Acoustical Science and Technology (ISSN:13463969)
- 巻号頁・発行日
- vol.36, no.6, pp.478-488, 2015 (Released:2015-11-01)
- 参考文献数
- 22
- 被引用文献数
- 1 4
This paper presents a real-time robust formant tracking system for speech using a real-time phase equalization-based autoregressive exogenous model (PEAR) with electroglottography (EGG). Although linear predictive coding (LPC) analysis is a popular method for estimating formant frequencies, it is known that the estimation accuracy for speech with high fundamental frequency F0 would be degraded since the harmonic structure of the glottal source spectrum deviates more from the Gaussian noise assumption in LPC as its F0 increases. In contrast, PEAR, which employs phase equalization and LPC with an impulse train as the glottal source signals, estimates formant frequencies robustly even for speech with high F0. However, PEAR requires higher computational complexity than LPC. In this study, to reduce this computational complexity, a novel formulation of PEAR was derived, which enabled us to implement PEAR for a real-time robust formant tracking system. In addition, since PEAR requires timings of glottal closures, a stable detection method using EGG was devised. We developed the real-time system on a digital signal processor and showed that, for both the synthesized and natural vowels, the proposed method can estimate formant frequencies more robustly than LPC against a wider range of F0.
- 著者
- Ryoko Mugitani Sadao Hiroya
- 出版者
- 一般社団法人 日本音響学会
- 雑誌
- Acoustical Science and Technology (ISSN:13463969)
- 巻号頁・発行日
- vol.33, no.4, pp.215-220, 2012-04-01 (Released:2012-07-01)
- 参考文献数
- 37
- 被引用文献数
- 12