Just noticeable difference (JND) values are available for most acoustical parameters currently used in practice. However, they have been determined with reference to conditions typically encountered in concert halls and in rooms for speech, covering a range of reverberation times (T) spanning from 0.5 s to 2 s. When reverberation gets longer, the relationship between measured parameters describing acoustic clarity may change significantly and subjective perception might also be different. The proposed research investigates the influence of reverberation time on JND for clarity measures taking into account three reference cases having T values varying from 2 s to 6 s. Measured B-format impulse responses were properly modified to introduce the desired changes and then auralized with two music motifs for presentation on a 4-channel playback system. Listening tests based on paired comparisons were carried out to determine subjective limens. The results proved to be independent of music motifs and showed that JND in the clarity index is almost independent of T, while JND in the center time is significantly related to T and can be assumed as the 8.5% of the reference TS value.
|Autori interni:||MARTELLOTTA, Francesco|
|Titolo:||The just noticeable difference of centre time and clarity index in large reverberant spaces|
|Rivista:||THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA|
|Data di pubblicazione:||2010|
|Digital Object Identifier (DOI):||10.1121/1.3455837|
|Appare nelle tipologie:||1.1 Articolo in rivista|