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Instantaneous and Overall Judgements for Time-Varying Speech Quality: Assessments and Relationships

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This study investigates the perception of time-varying speech quality in telephony. Two experiments were conducted, in which a method of continuous judgement was used in order to study instantaneous reactions of listeners facing quality fluctuations over time, and their consequences on overall perceived quality. The aim of the first experiment was to validate the method used for various quality evolutions over time. In a second experiment, the relationship between instantaneous and overall judgements was investigated. The results of the first experiment validate the method and show that subjects react with different time constants to large sudden quality degradations (about 10 seconds) or improvements (about 30 seconds). The second experiment demonstrated that the location of a quality degradation or improvement influenced subjects' overall judgements, revealing a recency effect.
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Document Type: Research Article

Publication date: May 1, 2001

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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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