Third International Conference on Spoken Language Processing (ICSLP 94)

Yokohama, Japan
September 18-22, 1994

Effects of Natural Auditory Feedback on Fundamental Frequency Control

HIdeki Kawahara

ATR Human Information Processing Research Laboratories, Kyoto, Japan

This paper introduces a model of fundamental frequency control which includes auditory feedback as an indispensable component. Through the use of a new technique called Transformed Auditory Feedback (TAF), it is shown that there is a compensatory response with 100ms to 200ms latency to fundamental frequency fluctuations. However, it is not clear whether or not this response is an artifact caused by the artificial feedback conditions. Fundamental frequency trajectories produced without artificial feedback were analyzed to test whether the response found using TAF also exists under natural conditions. Spectral estimates of these trajectories obtained using an auto-regressive (AR) model extracted several sharp resonances inside 2Hz to 5Hz region, which correspond to compensatory responses with 100ms to 250ms latency. PARCOR parameters also showed that there are negative peaks in the same region. These observations were confirmed by Delayed Auditory Feedback (DAF) experiments. The predicted amount of shift was observed in both spectral peaks and peaks in PARCOR coefficients. These results illustrate that auditory perception plays the role F0 an automatic regulating system of fundamental frequencies. They also show that response parameters extracted by TAF experiments are consistent with parameters found under natural conditions.

Full Paper

Bibliographic reference.  Kawahara, HIdeki (1994): "Effects of natural auditory feedback on fundamental frequency control", In ICSLP-1994, 1399-1402.