Experimental comparison of speech transmission index measurement in natural sound rooms and auditoria

Zhu, Peisheng; Tao, Wanqi; Mo, Fangshuo; Guo, Fei; Lü, Xiaodong; Liu, Xidong

doi:10.1016/j.apacoust.2020.107326

Cited by 8 publications

(10 citation statements)

References 30 publications

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“…The simulation results are in acceptable agreement with the research results [5], [8], [9], [10], which indicates the efficiency and correct functioning of the obtained software.…”

Section: Mlssupporting

confidence: 81%

“…Although the authors of [5], [8], [9], [10] claim they have compared direct and indirect methods, it is not always clear which type of indirect method, IR1 or IR2, was implemented. In addition, attempts to compare the results of implementation of IR1 and IR2 variants are unknown.…”

Section: Problem Statementmentioning

confidence: 99%

“…In article [10], it is shown that the difference between experimental estimates of STI obtained by direct and indirect methods using the DIRAC, AURORA and NTi systems does not exceed 0.03. MLS with a pink spectrum, an exponential sweep signal, and a set of test signals for the implementation of the direct STI estimation method were used.…”

Section: Introductionmentioning

confidence: 99%

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Multicomponent Signal for Comparing Direct and Indirect Methods of Speech Transmission Index Measurement

Prodeus,

Dvornyk,

Naida

et al. 2023

ECS

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When evaluating the intelligibility of speech distorted by noise and reverberation, direct or indirect methods of measuring the speech transmission index are used. However, it remains insufficiently studied how significantly differ the results of measurements obtained by direct and indirect methods. To find an answer to this question, the use of a multicomponent test signal consisting of four "elementary" signals separated by pauses is proposed in this paper. As "elementary" signals, it is proposed to use a maximum-length sequence, a speech shaped maximum-length sequence, a speech shaped stationary noise, and a speech shaped amplitude-modulated noise. Use of amplitude-modulated noise allows estimating speech transmission index by a direct method. Other "elementary" signals make it possible to estimate speech transmission index by two variants of indirect method. The proposed algorithms and corresponding computer programs were tested on trial signal models, while the consistency of the obtained results with the results of previous studies was revealed. The results of the signal models studies show that both considered variants of the indirect speech transmission index measurement method lead to underestimated results compared to the direct method. For one of the variants of the indirect method, the value of the estimate bias is 0.03–0.04, regardless of the interfering conditions. For another variant of the indirect method, the estimate bias varies from 0.01 to 0.18, depending on the interference conditions.

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“…The simulation results are in acceptable agreement with the research results [5], [8], [9], [10], which indicates the efficiency and correct functioning of the obtained software.…”

Section: Mlssupporting

confidence: 81%

Section: Problem Statementmentioning

confidence: 99%

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Multicomponent Signal for Comparing Direct and Indirect Methods of Speech Transmission Index Measurement

Prodeus,

Dvornyk,

Naida

et al. 2023

ECS

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“…It can be assumed that the reason for this situation is insufficient study of using the STITEL method in rooms. In addition, it can be assumed the insufficient study of the STITEL method is caused by the existence of competitive fast indirect STI measurement methods [15][16][17][18], which are currently implemented in several hardware and software applications [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of a Rarely Used Method of Measuring the Speech Transmission Index in Premises

Prodeus,

Naida,

Dvornyk

et al. 2023

Int. J. Archit. Eng. Technol.

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Evaluation of speech transmission index (STI) in premises allows for determining the speech intelligibility, and therefore the suitability of premises for speech communication. STI measurements using the speech transmission index for telecommunication systems (STITEL) method are rarely performed in rooms, possibly due to insufficient information on the accuracy of this method. In this paper, computer simulations were used to estimate the STI estimation errors by the STITEL method under conditions of noise and reverberation. The pink noise model and the room impulse response estimate of a real room with a reverberation time T60=0.8 s were used for the research. The duration of the test signals varied between 4, 8, 16, 32, and 64 seconds, and the signal-to-noise ratio varied from minus 28 dB to plus 28 dB. The dependences of the bias, standard deviation, and total error of the STI estimate on the duration of the test signal and the signal-to-noise ratio are obtained. It is shown that the total error of the STI estimation is close to 0.03 when the duration of the test signal is 8 s. Under conditions of noise action, this error decreases with a further increase in the duration of the test signal. Under conditions of joint action of noise and reverberation, such a decrease was not observed, while the total error is within 0.03-0.04.

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“…This system (also called "Direct" or "Person to Person" communication [1]) is characterized by the source and receiver being in the same environment and by the absence of electroacoustic speech reinforcement devices such as microphones, amplifiers, or loudspeakers (Figure 1). The NAS system is widely employed in a variety of spaces of small to moderate sizes where speech transmission quality and the resulting speech intelligibility is of critical importance [2,3]. Examples of these specialist spaces include courtrooms, control rooms, offices, theatres, conference rooms, interview rooms, operation theatres, and classrooms.…”

Section: Introduction 1backgroundmentioning

confidence: 99%

Non-Special Loudspeakers as Speech Test Sources in Natural Acoustics Speech Intelligibility Investigations

Gomez-Agustina,

Aygun,

Mohan

2023

Acoustics

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Objective speech intelligibility estimations undertaken in natural acoustics speech communications (NAS) scenarios require the utilization of a speech source that approximates the acoustic characteristics of a human talker. Only a limited number of special speech sources that conform to the specifications in the relevant guidelines are available in the market; however, they can be deemed expensive by professional practitioners and other users. Non-special and affordable loudspeakers are often used in NAS investigations in place of standardized special speech sources without the knowledge of their suitability and results validity. This study aims to examine the suitability of a range of representative common and affordable non-special loudspeakers as a potential alternative to standardized speech sources in NAS indicative or pilot investigations. Frequency response and Speech Transmission Index Public Address (STIPA) experimental results obtained from a reference standardized speech source were compared against results from various non-special loudspeakers measured utilizing diverse and real-world representative combinations of NAS acoustic conditions under controlled laboratory conditions. STIPA mean absolute errors for the alternative speech sources were generally lower than the STIPA method uncertainty and one Just Noticeable Difference (0.03 STI). The findings of this study will inform practitioners of the suitability of affordable loudspeakers when standardized special test loudspeakers are not available.

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Experimental comparison of speech transmission index measurement in natural sound rooms and auditoria

Cited by 8 publications

References 30 publications

Multicomponent Signal for Comparing Direct and Indirect Methods of Speech Transmission Index Measurement

Multicomponent Signal for Comparing Direct and Indirect Methods of Speech Transmission Index Measurement

Peculiarities of a Rarely Used Method of Measuring the Speech Transmission Index in Premises

Non-Special Loudspeakers as Speech Test Sources in Natural Acoustics Speech Intelligibility Investigations

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