The effects of reverberation on a listener's ability to recognize target sentences in the presence of up to three synchronized masking sentences

Kim S. Abouchacra, Joan Besing, Janet Koehnke, Tomasz Letowski

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Objective: To determine the effects of room reverberation on target sentence recognition in the presence of 0-to-3 synchronous masking sentences. Design: Target and masker sentences were presented through four loudspeakers (±90° and ±45° azimuth; 1m from the listener) in rooms having reverberation times (RT) of 0.2, 0.4, 0.6, and 1.1 s. Study Sample: Four groups of 13 listeners each participated in the study (N = 52). Results: In rooms with RTs of 0.2, 0.4, and 0.6 s, mean speech recognition scores (SRSs) were similar, with scores ranging from 96-100%, 90-95%, 75-80%, and 53-60%, when 0, 1, 2, and 3 competing sentences were present, respectively. However, in the room with a RT = 1.1 s, SRSs deteriorated significantly faster as the number of competing sentences increased; mean scores were 93%, 73%, 26%, and 10%, in the 0, 1, 2, 3, competing sentence condition, respectively. The majority of errors in SRSs (98%) resulted from listeners reporting words presented in masking sentences along with those in target sentences (mixing errors). Conclusions: Results indicate that reverberation has a similar influence on SRSs measured in multi-talker environments, when room reverberation is ≤ 0.6 s. However, SRSs are dramatically reduced in the room with a RT = 1.1 s, even when only one competing talker is present.

Original languageEnglish
Pages (from-to)468-476
Number of pages9
JournalInternational Journal of Audiology
Volume50
Issue number7
DOIs
StatePublished - 1 Jul 2011

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Aptitude
listener
ability
Reverberation
Masking
Listeners
Speech Recognition
time

Keywords

  • Speech recognition; Cocktail party effect; Reverberation

Cite this

@article{f4af86c361c34148b05669958a158982,
title = "The effects of reverberation on a listener's ability to recognize target sentences in the presence of up to three synchronized masking sentences",
abstract = "Objective: To determine the effects of room reverberation on target sentence recognition in the presence of 0-to-3 synchronous masking sentences. Design: Target and masker sentences were presented through four loudspeakers (±90° and ±45° azimuth; 1m from the listener) in rooms having reverberation times (RT) of 0.2, 0.4, 0.6, and 1.1 s. Study Sample: Four groups of 13 listeners each participated in the study (N = 52). Results: In rooms with RTs of 0.2, 0.4, and 0.6 s, mean speech recognition scores (SRSs) were similar, with scores ranging from 96-100{\%}, 90-95{\%}, 75-80{\%}, and 53-60{\%}, when 0, 1, 2, and 3 competing sentences were present, respectively. However, in the room with a RT = 1.1 s, SRSs deteriorated significantly faster as the number of competing sentences increased; mean scores were 93{\%}, 73{\%}, 26{\%}, and 10{\%}, in the 0, 1, 2, 3, competing sentence condition, respectively. The majority of errors in SRSs (98{\%}) resulted from listeners reporting words presented in masking sentences along with those in target sentences (mixing errors). Conclusions: Results indicate that reverberation has a similar influence on SRSs measured in multi-talker environments, when room reverberation is ≤ 0.6 s. However, SRSs are dramatically reduced in the room with a RT = 1.1 s, even when only one competing talker is present.",
keywords = "Speech recognition; Cocktail party effect; Reverberation",
author = "Abouchacra, {Kim S.} and Joan Besing and Janet Koehnke and Tomasz Letowski",
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The effects of reverberation on a listener's ability to recognize target sentences in the presence of up to three synchronized masking sentences. / Abouchacra, Kim S.; Besing, Joan; Koehnke, Janet; Letowski, Tomasz.

In: International Journal of Audiology, Vol. 50, No. 7, 01.07.2011, p. 468-476.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - The effects of reverberation on a listener's ability to recognize target sentences in the presence of up to three synchronized masking sentences

AU - Abouchacra, Kim S.

AU - Besing, Joan

AU - Koehnke, Janet

AU - Letowski, Tomasz

PY - 2011/7/1

Y1 - 2011/7/1

N2 - Objective: To determine the effects of room reverberation on target sentence recognition in the presence of 0-to-3 synchronous masking sentences. Design: Target and masker sentences were presented through four loudspeakers (±90° and ±45° azimuth; 1m from the listener) in rooms having reverberation times (RT) of 0.2, 0.4, 0.6, and 1.1 s. Study Sample: Four groups of 13 listeners each participated in the study (N = 52). Results: In rooms with RTs of 0.2, 0.4, and 0.6 s, mean speech recognition scores (SRSs) were similar, with scores ranging from 96-100%, 90-95%, 75-80%, and 53-60%, when 0, 1, 2, and 3 competing sentences were present, respectively. However, in the room with a RT = 1.1 s, SRSs deteriorated significantly faster as the number of competing sentences increased; mean scores were 93%, 73%, 26%, and 10%, in the 0, 1, 2, 3, competing sentence condition, respectively. The majority of errors in SRSs (98%) resulted from listeners reporting words presented in masking sentences along with those in target sentences (mixing errors). Conclusions: Results indicate that reverberation has a similar influence on SRSs measured in multi-talker environments, when room reverberation is ≤ 0.6 s. However, SRSs are dramatically reduced in the room with a RT = 1.1 s, even when only one competing talker is present.

AB - Objective: To determine the effects of room reverberation on target sentence recognition in the presence of 0-to-3 synchronous masking sentences. Design: Target and masker sentences were presented through four loudspeakers (±90° and ±45° azimuth; 1m from the listener) in rooms having reverberation times (RT) of 0.2, 0.4, 0.6, and 1.1 s. Study Sample: Four groups of 13 listeners each participated in the study (N = 52). Results: In rooms with RTs of 0.2, 0.4, and 0.6 s, mean speech recognition scores (SRSs) were similar, with scores ranging from 96-100%, 90-95%, 75-80%, and 53-60%, when 0, 1, 2, and 3 competing sentences were present, respectively. However, in the room with a RT = 1.1 s, SRSs deteriorated significantly faster as the number of competing sentences increased; mean scores were 93%, 73%, 26%, and 10%, in the 0, 1, 2, 3, competing sentence condition, respectively. The majority of errors in SRSs (98%) resulted from listeners reporting words presented in masking sentences along with those in target sentences (mixing errors). Conclusions: Results indicate that reverberation has a similar influence on SRSs measured in multi-talker environments, when room reverberation is ≤ 0.6 s. However, SRSs are dramatically reduced in the room with a RT = 1.1 s, even when only one competing talker is present.

KW - Speech recognition; Cocktail party effect; Reverberation

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