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Audiol > Volume 1(1); 2005 > Article
Audiology 2005;1(1): 35-39.
Published online: December 31, 2005.
doi: http://doi.org/10.21848/audiol.2005.1.1.35
정상 청력에서 구성성분 위상이 복합배음 변별에 미치는 영향
구성민1, 임덕환2
1한림대학교 대학원 청각학전공
2한림대학교 자연과학대학 언어청각학부, 청각언어연구소
Effects of Relative Phases on Discrimination of Harmonic Complex Tones
Sungmin Koo1, Dukhwan Lim2
1Graduate School, Hallym University, Chuncheon, Korea,
2Division of Speech Pathology & Audiology, Research Institute of Audiology & Speech Pathology, Hallym University, Chuncheon, Korea
Correspondence  Dukhwan Lim ,Tel: (033) 248-2217, Fax: (02) 6280-9133, Email: dlim@hallym.ac.kr
Received: October 25, 2005;  Accepted: December 1, 2005.  Published online: December 31, 2005.
The effects of relative phases on discriminating harmonic complex tones were studied under no noise conditions for twelve young adults with normal hearing. Harmonic complex tones consisted of the first 4 harmonics of 500 Hz with equal amplitudes and initial starting phases of 0°. Stimuli were digitally synthesized and two alternative forced choice (2AFC) method was used to collect the corresponding discrimination scores. Results showed that the clear symmetry around 180°phase shift except for 2000 Hz. The higher percentage of correct discrimination was noticed as well at around the phase shift of 180°. These discrimination scores were significantly influenced by the variation of the phase shift of the third harmonic component of the complex signal regardless of the amount of phase shifts except at 5°and 315°. Data suggested that the phase shifts of individual harmonic tones had differential contributions to the discrimination of tonal complex tones. Further studies of phase effects on harmonic complex tones under various conditions would be helpful in analyzing the behavioral responses to harmonic stimuli.
Key Words: Harmonic complex tone·Individual phase shift·Two alternative forced choice (2AFC).
중심단어: 복합배음· 초기위상· Two alternative forced choice(2AFC).
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