A study was conducted to propose an analytical method for assessing temporal interference of speech by delayed auditory feedback (DAF) quantitatively and in isolation. Fifteen native Japanese speakers, including 8 males and 7 females aged between 19-31 years participated in this experiment. Participants were seated comfortably on a chair in a sound attenuated chamber. They were instructed to produce a vowel /a/ with the same duration as a pre-presented tone and their voice was recorded with a microphone attached to headphones located approximately 5 cm from the participants' mouth. The voice was sent to a mixer, an audio recorder, and a delay machine. The voice sent to the delay machine was delayed by 200 ms and played back into the headphones after mixing with white masking noise from a noise generator. The delay under the DAF condition was configured at 200 ms, as it was well known that the 200 ms was the most disruptive delay on speech control.
ASJC Scopus subject areas
- Acoustics and Ultrasonics