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Investigation of Two-Tone Interaction in Octave Complexes with the Help of the Pulsation-Threshold Method

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Two pure tones with a frequency ratio 1 : 2, presented simultaneously to the ear, can give rise to effects on the loudness and the pitch of the higher-frequency component if their phase relation is varied. The phase effects have been investigated by the pulsation threshold method, in order to determine which test-tone frequency region contributes to the phase effects and what role two-tone non-linearity (“suppression”) plays. The results of the pulsation threshold experiments have been related to the variation of the loudness of the higher-frequency component, where the phenomenon of “loudness reduction” is encountered.

The results are discussed with reference to their consequences for the current explanations of the phase effects. Special attention has been given to the question of whether the phase effects might be the result of a vector summation of an aural harmonic present in the mechanical part of the auditory system and the higher-frequency component of the complex.
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Document Type: Research Article

Publication date: December 1, 1977

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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