Simultaneous room reflection masking

Effect of forward fringe and direct sound duration

Jörg M. Buchholz*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

In dichotic tone-in-noise masking experiments it has been shown that adding a forward fringe to the masker leads to a significant masked threshold (MT) decrease. With reference to simultaneous room reflection masking (i.e., a test reflection masked by the direct sound), it has been shown that for very short reflection delays (<8ms) the test reflection is binaurally suppressed whereas for longer reflection delays (>8ms) the detectability of the test reflection is binaurally enhanced [Buchholz, JASA, 2005]. Considering the auditory processes underlying room reflection masking, increasing the reflection delay on the one hand changes the spectral and temporal characteristics of the stimulus and on the other hand produces an increasing forward fringe (i.e., a reflection-free direct sound interval). Throughout this study, it is investigated to what extent the auditory processes underlying simultaneous room reflection masking utilize the information provided by (a) the reflection-free direct sound interval and (b) the actual reflection interval. In this regard, an additional forward fringe was added to the direct sound, and dichotic and diotic MTs for broadband noise were measured in dependency of the reflection delay, the reflection duration, and the forward fringe duration. The results reveal that the effect of binaural suppression of reflections is significantly increasing with increasing reflection duration, leading to a binaural suppression effect of about 10dB for 320ms long reflections and to no suppression effect for 20ms long reflections. Moreover, adding a forward fringe led to a decrease of binaural suppression of reflections for reflection durations below 160ms.

Original languageEnglish
Title of host publicationForum Acusticum Budapest 2005: 4th European Congress on Acustics
Place of PublicationDenmark
PublisherInternational Symposium on Auditory and Audiological Research
Pages1519-1524
Number of pages6
ISBN (Print)9638241683, 9789638241689
Publication statusPublished - 2005
Externally publishedYes
Event4th European Congress on Acustics, Forum Acusticum - 2005 - Budapest, Hungary
Duration: 29 Aug 20052 Sep 2005

Other

Other4th European Congress on Acustics, Forum Acusticum - 2005
CountryHungary
CityBudapest
Period29/08/052/09/05

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  • Cite this

    Buchholz, J. M. (2005). Simultaneous room reflection masking: Effect of forward fringe and direct sound duration. In Forum Acusticum Budapest 2005: 4th European Congress on Acustics (pp. 1519-1524). Denmark: International Symposium on Auditory and Audiological Research.