An acoustic measurement program for evaluating auditoriums and related spaces based on the early/late sound energy ratio

Marshall, L. Gerald

doi:10.1121/1.404471

Cited by 4 publications

(7 citation statements)

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“…• Weighted C 50 according to Marshall (1994) was proven to be poor speech intelligibility predictor.…”

Section: Discussionmentioning

confidence: 99%

“…In this paper we use weighed C 50 which was introduced by Marshall (1994). The weighting values reflect the impact of different octave bands on speech recognition and can be used for prediction of speech intelligibility according to the above mentioned paper: for the octave bands of 0.5 kHz, 1 kHz, 2 kHz and 4 kHz the weights of 0.15, 0.25, 0.35 and 0.25 were assigned respectively, and then the results were summed.…”

Section: Objective Parametersmentioning

confidence: 99%

“…Four objective parameters in each enclosure were measured: reverberation time (RT), according to ISO 3382 norm (2010), early decay time (EDT), weighted clarity C 50 (Marshall, 1994), and speech transmission index (STI), introduced by Houtgast and Steeneken (1973).…”

Section: Objective Parametersmentioning

confidence: 99%

“…Range of objective parameters and speech recognition parameters values measured in tested enclosures. The RT and EDT and C50 were measured according to ISO 3382 (2010), then C50 was weighted according to (Marshall, 1994 an incorrect note. All subjects were paid and took part in a short training session to familiarize with the task.…”

Section: Intelligibility Testsmentioning

confidence: 99%

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Logatome and Sentence Recognition Related to Acoustic Parameters of Enclosures

Kociński

Ozimek

2017

Archives of Acoustics

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The paper deals with relationship between speech recognition and objective parameters of enclosures. Six enclosures were chosen: a church, an assembly hall of a music school, two courtrooms of different volumes, a typical auditorium and a university concert hall. Dirac 4.1 software was used to record impulse responses (IRs) in the chosen measurement points of each enclosure. On this base, the following objective parameters of the enclosure were determined: Reverberation Time (RT), Early Decay Time (EDT), Weighted Clarity (C50) and Speech Transmission Index (STI). A convolution of the IRs with logatome tests and the Polish Sentence Test (PST) was made. Logatome recognition and speech reception threshold (SRT -i.e., SNR yielding 50% speech recognition) were evaluated and their dependence on the objective parameters were determined. Generally a linear relationship between logatome or SRT and RT or EDT was found. However, speech recognition was nonlinearly related (according to psychometric function) to STI values. The most sensitive range of the logatome and sentence recognition relative to STI changes corresponded to the middle range of STI values. Below and above this range, logatome and sentence recognition were much less dependent of STI changes.

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“…• Weighted C 50 according to Marshall (1994) was proven to be poor speech intelligibility predictor.…”

Section: Discussionmentioning

confidence: 99%

Section: Objective Parametersmentioning

confidence: 99%

Section: Objective Parametersmentioning

confidence: 99%

Section: Intelligibility Testsmentioning

confidence: 99%

See 2 more Smart Citations

Logatome and Sentence Recognition Related to Acoustic Parameters of Enclosures

Kociński

Ozimek

2017

Archives of Acoustics

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“…Later-arriving speech sounds are usually found to be detrimental to the intelligibility of speech (Bradley, 1998). Some measures of early reflections are used such as EDT obtained from the first 10 dB of decay (Standardization, 1998) and the energy index -Clarity (C 50 ) -as the ratio of early (from 0 to 50 ms) to late energy (over 50 ms) (Bradley, 1983;1990;Marshall, 1994). A relative strength of the early reflection is expressed by various measures and their interdependence.…”

Section: Introductionmentioning

confidence: 99%

Speech Recognition in an Enclosure with a Long Reverberation Time

Kociński¹,

Ozimek²

2016

Archives of Acoustics

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The aim of this work was to measure subjective speech intelligibility in an enclosure with a long reverberation time and comparison of these results with objective parameters. Impulse Responses (IRs) were first determined with a dummy head in different measurement points of the enclosure. The following objective parameters were calculated with Dirac 4.1 software: Reverberation Time (RT), Early Decay Time (EDT), weighted Clarity (C50) and Speech Transmission Index (STI). For the chosen measurement points, a convolution of the IRs with the Polish Sentence Test (PST) and logatome tests was made. PST was presented at a background of a babble noise and speech reception threshold -SRT (i.e. SNR yielding 50% speech intelligibility) for those points were evaluated. A relationship of the sentence and logatome recognition vs. STI was determined. It was found that the final SRT data are well correlated with speech transmission index (STI), and can be expressed by a psychometric function. The difference between SRT determined in condition without reverberation and in reverberation conditions appeared to be a good measure of the effect of reverberation on speech intelligibility in a room. In addition, speech intelligibility, with and without use of the sound amplification system installed in the enclosure, was compared.

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Correlations of the Acoustic Fields of Mudejar-Gothic Churches

2008

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This paper studies the statistical correlations between monaural acoustic parameters with themselves and with architectural parameters from an acoustical survey undertaken in 12 Mudejar-Gothic churches in Seville, southern Spain. Objective room-acoustic parameters have been measured using impulse response analysis through a maximum-length-sequence measurement system in each church. Measurements cover time parameters (reverberation time, early decay time); levels (sound strength); energy-based parameters (centre time, clarity for speech, clarity, definition, early lateral energy fraction); and speech intelligibility (rapid speech transmission index) and the analysis takes into account both spatially averaged values and individual positions. The aim of the study is to identify the main architectural factors that have relevant influence on the acoustic fields of the churches, and the minimum number of room acoustic parameters which are able to describe adequately this acoustic field, thus the possible excess of information is evaluated. Significant correlations have been found that, in the best cases, correspond to fits using pairs of independent variables instead of one single variable. The best option to describe the six subjective attributes of sound perception in these buildings consists of three acoustic parameters formed by two different pairs plus the early lateral energy fraction. *Lateral wall: v=visible brick; pp=plastered and painted; d=directly painted brick. Baseboard: mc= major chapel; wc= whole church. Decoration: s=scarce; f=fair; p=profuse. Ceiling: w=wooden framework in three naves; t=tiles substitute the wooden board in the laterals; r=rough ceramics substitute the wooden boards in the central nave. Inner doors: si=single; do=double.

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An acoustic measurement program for evaluating auditoriums and related spaces based on the early/late sound energy ratio

Cited by 4 publications

References 0 publications

Logatome and Sentence Recognition Related to Acoustic Parameters of Enclosures

Logatome and Sentence Recognition Related to Acoustic Parameters of Enclosures

Speech Recognition in an Enclosure with a Long Reverberation Time

Correlations of the Acoustic Fields of Mudejar-Gothic Churches

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