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The Influence of the Semantic Material on the Assessment of Speech Reception Threshold

Magdalena Krenz Andrzej Wicher Aleksander Sęk
Archives of Acoustics | 2015 | vol. 40 | No 1 | 41-50 | DOI: 10.1515/aoa-2015-0006
Keywords speech intelligibility speech test speech reception threshold
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Abstract

To determine speech intelligibility using the test suggested by Ozimek et al. (2009), the subject composed sentences with the words presented on a computer screen. However, the number and the type of these words were chosen arbitrarily. The subject was always presented with 18, similarly sounding words. Therefore, the aim of this study was to determine whether the number and the type of alternative words used by Ozimek et al. (2009), had a significant influence on the speech intelligibility. The aim was also to determine an optimal number of alternative words: i.e., the number that did not affect the speech reception threshold (SRT) and not unduly lengthened the duration of the test. The study conducted using a group of 10 subjects with normal hearing showed that an increase in the number of words to choose from 12 to 30 increased the speech intelligibility by about 0.3 dB/6 words. The use of paronyms as alternative words as opposed to random words, leads to an increase in the speech intelligibility by about 0.6 dB, which is equivalent to a decrease in intelligibility by 15 percentage points. Enlarging the number of words to choose from, and switching alternative words to paronyms, led to an increase in response time from approximately 11 to 16 s. It seems that the use of paronyms as alternative words as well as using 12 or 18 words to choose from is the best choice when using the Polish Sentence Test (PST).
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Authors and Affiliations

Magdalena Krenz
Andrzej Wicher
Aleksander Sęk

Effects of Speech Intensity on the Callsign Acquisition Test (CAT) and Modified Rhyme Test (MRT) Presented in Noise

Misty Blue-Terry Maranda McBride Tomasz Letowski
Archives of Acoustics | 2012 | vol. 37 | No 2 | 199-203 | DOI: 10.2478/v10168-012-0026-3
Keywords speech intelligibility speech intensity speech-to-noise ratio
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Abstract

This study sought to evaluate the effect of speech intensity on performance of the Callsign Acquisition Test (CAT) and Modified Rhyme Test (MRT) presented in noise. Fourteen normally hearing listeners performed both tests in 65 dB A white background noise. Speech intensity varied while background noise remained constant to form speech-to-noise ratios (SNRs) of -18, -15, -12, -9, and -6 dB. Results showed that CAT recognition scores were significantly higher than MRT scores at the same SNRs; however, the scores from both tests were highly correlated and their relationship for the SNRs tested can be expressed by a simple linear function. The concept of CAT can be easily ported to other languages for testing speech communication under adverse listening conditions.

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Authors and Affiliations

Misty Blue-Terry
Maranda McBride
Tomasz Letowski

Speech Intelligibility Test for Polish Language – Relation to the Acoustic Properties of Classrooms and Comparison to Other Languages

Jan Radosz
Archives of Acoustics | 2018 | vol. 43 | No 1 | DOI: 10.24425/118088
Keywords speech intelligibility classrooms schools room acoustics
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Authors and Affiliations

Jan Radosz

Speech Intelligibility in Rooms with and without an Induction Loop for Hearing Aid Users

Jędrzej Kociński Edward Ozimek
Archives of Acoustics | 2015 | vol. 40 | No 1 | 51-58 | DOI: 10.1515/aoa-2015-0007
Keywords speech intelligibility induction loop hearing impairment speech enhancement
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Abstract

The paper presents the results of sentence and logatome speech intelligibility measured in rooms with induction loop for hearing aid users. Two rooms with different acoustic parameters were chosen. Twenty two subjects with mild, moderate and severe hearing impairment using hearing aids took part in the experiment. The intelligibility tests composed of sentences or logatomes were presented to the subjects at fixed measurement points of an enclosure. It was shown that a sentence test is more useful tool for speech intelligibility measurements in a room than logatome test. It was also shown that induction loop is very efficient system at improving speech intelligibility. Additionally, the questionnaire data showed that induction loop, apart from improving speech intelligibility, increased a subject’s general satisfaction with speech perception
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Authors and Affiliations

Jędrzej Kociński
Edward Ozimek

The Influence of a Single Therapeutic Dose of Methadone on Selected Auditory Functions in Patients Addicted to Opioids and Undergoing Substitution Therapy – a Preliminary Study

Emilia Tarnowska Andrzej Wicher Aleksander Sęk Edward Jacek Gorzelańczyk
Archives of Acoustics | 2018 | vol. 43 | No 1 | DOI: 10.24425/118089
Keywords methadone opioids speech intelligibility otoacoustic emissions hearing threshold
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Authors and Affiliations

Emilia Tarnowska
Andrzej Wicher
Aleksander Sęk
Edward Jacek Gorzelańczyk

Speech Recognition in an Enclosure with a Long Reverberation Time

Jędrzej Kociński Edward Ozimek
Archives of Acoustics | 2016 | vol. 41 | No 2 | 255-264 | DOI: 10.1515/aoa-2016-0025
Keywords speech intelligibility speech recognition sentence test reverberation time clarity speech transmission index
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Abstract

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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Authors and Affiliations

Jędrzej Kociński
Edward Ozimek

Study on Chinese Speech Intelligibility Under Different Low-Frequency Characteristics of Reverberation Time Using a Hybrid Method

Wuqiong Huang Jianxin Peng Tinghui Xie
Archives of Acoustics | 2023 | vol. 48 | No 2 | 151-157 | DOI: 10.24425/aoa.2023.145229
Keywords low frequency speech intelligibility classroom finite-difference time-domain method
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Abstract

Reverberation time (RT) is an important indicator of room acoustics, however, most studies focus on the mid-high frequency RT, and less on the low-frequency RT. In this paper, a hybrid approach based on geometric and wave methods was proposed to build a more accurate and wide frequency-band room acoustic impulse response. This hybrid method utilized the finite-difference time-domain (FDTD) method modeling at low frequencies and the Odeon simulation at mid-high frequencies, which was investigated in a university classroom. The influence of the low-frequency RT on speech intelligibility was explored. For the low-frequency part, different impedance boundary conditions were employed and the effectiveness of the hybrid method has also been verified. From the results of objective acoustical parameters and subjective listening experiments, the smaller the low-frequency RT was, the higher the Chinese speech intelligibility score was. The syllables, consonants, vowels, and the syllable order also had significant effects on the intelligibility score.
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Authors and Affiliations

Wuqiong Huang
1 2
Jianxin Peng
1
Tinghui Xie
3
  1. School of Physics and Optoelectronics, South China University of Technology, Guangzhou, China
  2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou, China
  3. School of Architecture and Art, Shijiazhuang Tiedao University, Shijiazhuang, China

Mosque as a Bilingual Space – an Investigation on Speech Intelligibility in Mosque Acoustics Using Simulation Techniques

Elma Alic Asli Ozcevik Bilen
Archives of Acoustics | 2021 | vol. 46 | No 3 | 443-457 | DOI: 10.24425/aoa.2021.138131
Keywords mosque acoustics bilingual space acoustical simulation speech intelligibility word recognition tests auralisation
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Abstract

Mosques are Islamic places of worship where speech and music rituals are performed. Since two different languages are spoken there, mosques are described as bilingual spaces. Among studies on the complex acoustic structure of mosques there are only few studies on speech intelligibility and none on the bilingual characteristics of the mosque. Therefore, a comprehensive study has been carried out to evaluate the acoustic comfort of the contemporary Turkish mosques (CTM) over speech intelligibility of Turkish and Arabic languages. In the study the CTM model providing optimum acoustic conditions recommended in the literature is examined on speech intelligibility by applying acoustic simulation and auralisation techniques, as well as word recognition tests. As a result, the acoustic condition in the model is found insufficient in terms of speech intelligibility of both languages. Also, with the decrease of Signal-to-Noise Ratio (SNR), the Turkish intelligibility ratio is observed to decrease at least two times faster than the Arabic ones.
This study is viewed as an outline for researchers to further study mosque acoustics in terms of speech intelligibility, and thus support the standardisation process of the acoustic comfort criteria for the mosques.
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Authors and Affiliations

Elma Alic
1
Asli Ozcevik Bilen
1
  1. Department of Architecture, Eskisehir Technical University, Eskisehir, Turkey

Relationship Between Chinese Speech Intelligibility of Elderly and Speech Transmission Index

Jianxin Peng Jiazhong Zeng Yuezhe Zhao
Archives of Acoustics | 2021 | vol. 46 | No 2 | 229–235 | DOI: 10.24425/aoa.2021.136578
Keywords speech intelligibility speech transmission index signal-to-noise ratio background noise level speech sound pressure level reverberation time
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Abstract

In this paper, the relationship between Chinese speech intelligibility (CSI) scores of the elderly aged 60–69 and over 70 years old, and speech transmission index (STI) were investigated through the auralization method under different reverberation time and background noise levels (BNL, 40 dBA and 55 dBA). The results show that the CSI scores of the elderly are significantly worse than those of young adults. For the elderly over 70, the CSI scores become much lower than those of young adults. To be able to achieve the same CSI, the elderly, especially those over 70, need much higher STI and greater SNR than the young. The elderly aged 60–69 and over 70 need to improve their STI by 0.419 and 0.058 respectively under BNL 40 dBA, as well as 0.282 and 0.072 respectively under BNL 55 dBA, so as to obtain the same CSI scores as the young adults.
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Authors and Affiliations

Jianxin Peng
1 2
Jiazhong Zeng
3
Yuezhe Zhao
2
  1. School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong, China, 510640
  2. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou, Guangdong, China, 510640
  3. School of Architecture, South China University of Technology, Guangzhou, Guangdong, China, 510640

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