聴覚系の時間分解能がFM‐AM音の平均的高さ(主要調子)知覚に及ぼす影響

Translated title of the contribution: Influence of temporal resolving power of the auditory system on perceived principal pitch of FM-AM tones.

岩宮 眞一郎

Research output: Contribution to journalArticle

Abstract

"FM-AM tones" are defined as fluctuation tones whose frequency and amplitude are periodically modulated by an identical modulation waveform simultaneously. "Principal pitch" is defined as somewhat steady and average pitch perceived from FM sounds with pitch fluctuation. In the present study the principal pitch shift of FM-AM tones was measured as a function of the modulation rate by the psychoacoustical experiment using a method of adjustment. The principal pitch shift interval from in-phase condition to anti-phase condition is nearly constant at the modulation rate of 4 to 7Hz, and becomes larger as the modulation rate becomes faster at the modulation rate of 7 to 20Hz. As the experimental results are considered to reflect the temporal resolving power of the auditory system for frequency modulation, the following hypothesis is proposed: The auditory system is able to follow the periodic frequency modulation when the modulation rate is slower than 7Hz. However, it becomes hard to follow the faster frequency modulation for the auditory system. Furthermore when the modulation rate becomes too fast to follow the modulation process, the perceived extent of FM becomes smaller, and is shifted toward the frequency region accompanied with larger amplitude.
Original languageJapanese
Pages (from-to)109-116
Number of pages8
Journal人間工学 = The Japanese journal of ergonomics
Volume21
Issue number3
DOIs
Publication statusPublished - 1985
Externally publishedYes

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frequency modulation
modulation
shift
waveforms
adjusting
intervals
acoustics

Cite this

聴覚系の時間分解能がFM‐AM音の平均的高さ(主要調子)知覚に及ぼす影響. / 岩宮眞一郎.

In: 人間工学 = The Japanese journal of ergonomics, Vol. 21, No. 3, 1985, p. 109-116.

Research output: Contribution to journalArticle

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AB - "FM-AM tones" are defined as fluctuation tones whose frequency and amplitude are periodically modulated by an identical modulation waveform simultaneously. "Principal pitch" is defined as somewhat steady and average pitch perceived from FM sounds with pitch fluctuation. In the present study the principal pitch shift of FM-AM tones was measured as a function of the modulation rate by the psychoacoustical experiment using a method of adjustment. The principal pitch shift interval from in-phase condition to anti-phase condition is nearly constant at the modulation rate of 4 to 7Hz, and becomes larger as the modulation rate becomes faster at the modulation rate of 7 to 20Hz. As the experimental results are considered to reflect the temporal resolving power of the auditory system for frequency modulation, the following hypothesis is proposed: The auditory system is able to follow the periodic frequency modulation when the modulation rate is slower than 7Hz. However, it becomes hard to follow the faster frequency modulation for the auditory system. Furthermore when the modulation rate becomes too fast to follow the modulation process, the perceived extent of FM becomes smaller, and is shifted toward the frequency region accompanied with larger amplitude.

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