Is the Speech Transmission Index (STI) a robust measure of sound system speech intelligibility performance?

2002 ◽  
Vol 112 (5) ◽  
pp. 2331-2331 ◽  
Author(s):  
Peter Mapp
Keyword(s):  
Speech Intelligibility ◽  
Sound System ◽  
Transmission Index ◽  
Speech Transmission

Binaural speech-to-noise loudness ratio at the speech reception threshold in vehicles

2021 ◽  
Vol 69 (2) ◽  
pp. 173-179
Author(s):  
Nilolina Samardzic ◽  
Brian C.J. Moore
Keyword(s):  
Speech Intelligibility ◽  
New Method ◽  
Traditional Methods ◽  
Speech Reception ◽  
Typical Error ◽  
Transmission Index ◽  
Speech Transmission ◽  
Articulation Index ◽  
Speech Intelligibility Index ◽  
Binaural Listening

Traditional methods for predicting the intelligibility of speech in the presence of noise inside a vehicle, such as the Articulation Index (AI), the Speech Intelligibility Index (SII), and the Speech Transmission Index (STI), are not accurate, probably because they do not take binaural listening into account; the signals reaching the two ears can differ markedly depending on the positions of the talker and listener. We propose a new method for predicting the intelligibility of speech in a vehicle, based on the ratio of the binaural loudness of the speech to the binaural loudness of the noise, each calculated using the method specified in ISO 532-2 (2017). The method was found to give accurate predictions of the speech reception threshold (SRT) measured under a variety of conditions and for different positions of the talker and listener in a car. The typical error in the predicted SRT was 1.3 dB, which is markedly smaller than estimated using the SII and STI (2.0 dB and 2.1 dB, respectively).

On the disagreement between speech transmission index (STI) and speech intelligibility

2000 ◽  
Vol 108 (5) ◽  
pp. 2633-2633
Author(s):  
Hiroshi Onaga ◽  
Yoshihiro Furue ◽  
Tetsuo Ikeda
Keyword(s):  
Speech Intelligibility ◽  
Transmission Index ◽  
Speech Transmission

scholarly journals Archaeoacoustic Examination of Lazarica Church

Acoustics ◽  
2019 ◽  
Vol 1 (2) ◽  
pp. 423-438 ◽  
Author(s):  
Zorana Đorđević ◽  
Dragan Novković ◽  
Uroš Andrić
Keyword(s):  
Speech Intelligibility ◽  
Acoustic Analysis ◽  
Sound Field ◽  
Simulation Software ◽  
Central Dome ◽  
Acoustic Effect ◽  
Additional Information ◽  
Medieval Church ◽  
Transmission Index ◽  
Speech Transmission

The acoustic analysis provides additional information on building tradition and related indoor practice that includes sound, thus deepening our understanding of architectural heritage. In this paper, the sound field of the Orthodox medieval church Lazarica (Kruševac city, Serbia) is examined. Lazarica is a representative of Morava architectural style, developed in the final period of the Serbian medieval state, when also the chanting art thrived, proving the importance of the aural environment in Serbian churches. The church plan is a combination of a traditional inscribed cross and a triconch. After the in situ measurement of acoustic impulse response using EASERA software, we built a computer model in the acoustic simulation software EASE and calibrated it accordingly. Following the parameters (reverberation time (T30), early decay time (EDT) and speech transmission index (STI)), we examined the acoustic effect of the space occupancy, central dome and the iconostasis. In all the cases, no significant deviation between T30 and EDT parameter was observed, which indicates uniform sound energy decay. Closing the dome with a flat ceiling did not show any significant impact on T30, but it lowered speech intelligibility. The height of iconostasis showed no significant influence on the acoustics of Lazarica church.

scholarly journals The speech intelligibility and applicability of the speech transmission index in large spaces

2020 ◽  
Vol 167 ◽  
pp. 107400
Author(s):  
Hongshan Liu ◽  
Hui Ma ◽  
Jian Kang ◽  
Chao Wang
Keyword(s):  
Speech Intelligibility ◽  
Transmission Index ◽  
Speech Transmission

The Effect of Source Location, Posture and Language on Speech Intelligibility in Goan Churches

2009 ◽  
Vol 16 (3) ◽  
pp. 283-297 ◽  
Author(s):  
Menino A. S. M. P. Tavares ◽  
S. Rajagopalan ◽  
Satish J. Sharma ◽  
António P. O. Carvalho
Keyword(s):  
Speech Intelligibility ◽  
English Language ◽  
Field Measurements ◽  
Source Location ◽  
Transmission Index ◽  
Speech Transmission ◽  
Catholic Churches ◽  
Predictive Relationship ◽  
The Church ◽  
Made In

The results presented here are based on field measurements carried out in six Catholic churches (Goa, India). Rapid Speech Transmission Index ( RASTI) and Subjective Speech Intelligibility ( SSI) measurements were made in four different seating zones of a church for three speech source locations (altar, pulpit, high altar), two languages (English, Konkani) and two postures (standing, sitting). The effects of language and postures were not significant. The altar location and the sanctuary of the church were preferable for speech intelligibility. Although the altar location showed better averages than the other speech source locations, the best predictive relationship between RASTI and SSI was the exponential growth of RASTI for the high altar source location with SSI for the English language.

The Use of Virtual Reflectors to Improve Speech Intelligibility in Open Stage Auditoria

1998 ◽  
Vol 5 (1) ◽  
pp. 57-68 ◽  
Author(s):  
L. El-Zeky ◽  
D.J. Oldham
Keyword(s):  
Speech Intelligibility ◽  
Potential Problem ◽  
Computer Modelling ◽  
Conventional Technique ◽  
Energy Fraction ◽  
Human Speech ◽  
Suitable Parameter ◽  
Transmission Index ◽  
Speech Transmission ◽  
Reflecting Surfaces

A potential problem encountered with open stage auditoria is poor speech intelligibility arising from the directional nature of human speech sources. The conventional technique of employing large overhead reflecting surfaces to ensure a large early energy fraction to improve intelligibility is shown to be unsuitable in this situation. The use of Virtual Reflectors consisting of microphones and loudspeakers symmetrically located relative to the stage is proposed as a possible solution to the problems of open stage auditoria. It is suggested that the Speech Transmission Index is a suitable parameter for assessing the performance of Virtual Reflectors when in use and that computer modelling could provide a suitable method for investigating the action of Virtual Reflectors.

scholarly journals Acoustic Sensing Analytics Applied to Speech in Reverberation Conditions

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6320
Author(s):  
Piotr Odya ◽  
Jozef Kotus ◽  
Adam Kurowski ◽  
Bozena Kostek
Keyword(s):  
Speech Processing ◽  
Speech Intelligibility ◽  
Acoustic Sensing ◽  
Transmission Index ◽  
Speech Transmission ◽  
Natural Remedies ◽  
Polish Language ◽  
Processing Control ◽  
Acoustic Environments ◽  
Acoustic Conditions

The paper aims to discuss a case study of sensing analytics and technology in acoustics when applied to reverberation conditions. Reverberation is one of the issues that makes speech in indoor spaces challenging to understand. This problem is particularly critical in large spaces with few absorbing or diffusing surfaces. One of the natural remedies to improve speech intelligibility in such conditions may be achieved through speaking slowly. It is possible to use algorithms that reduce the rate of speech (RoS) in real time. Therefore, the study aims to find recommended values of RoS in the context of STI (speech transmission index) in different acoustic environments. In the experiments, speech intelligibility for six impulse responses recorded in spaces with different STIs is investigated using a sentence test (for the Polish language). Fifteen subjects with normal hearing participated in these tests. The results of the analytical analysis enabled us to propose a curve specifying the maximum RoS values translating into understandable speech under given acoustic conditions. This curve can be used in speech processing control technology as well as compressive reverse acoustic sensing.

scholarly journals Aspects regarding the acoustics of a lecture hall

2019 ◽  
Vol XXII (2) ◽  
pp. 268-275
Author(s):  
Pazara T.
Keyword(s):  
Speech Intelligibility ◽  
Great Influence ◽  
Lecture Hall ◽  
Naval Academy ◽  
Reverberation Time ◽  
Acoustical Parameters ◽  
Transmission Index ◽  
Speech Transmission ◽  
Virtual Simulations ◽  
Teaching Conditions

In a lecture hall it is vital to assure proper teaching conditions meaning that the information from the speaker/teacher must be received correctly by the listeners. Speech intelligibility is the main objective when a lecture hall is evaluated. In this paper, the authors discuss the importance of the acoustics of a lecture hall and the influence of various parameters over speech transmission from the speaker – the professors to the listeners – the students. The number of acoustical parameters is very large, but Speech Transmission Index (STI) and Reverberation Time (RT) are commonly used to evaluate the acoustics of a teaching room. Other parameters like room geometry and seat placement have great influence in speech intelligibility. As an example, a lecture hall of 120 seats from Naval Academy „Mircea cel Batran“ is investigated using virtual simulations with ODEON software. The results of the simulations are discussed and some remarks are made regarding the current condition of the lecture hall.

Impact of Partition types on Architecture design studios acoustical environment

2021 ◽  
Vol 263 (1) ◽  
pp. 5847-5857
Author(s):  
Hany Hossam Eldien ◽  
Umaru Bongwirnso
Keyword(s):  
Background Noise ◽  
Speech Intelligibility ◽  
Architecture Design ◽  
Front Side ◽  
Open Spaces ◽  
Transmission Index ◽  
Speech Transmission ◽  
Open Plan ◽  
High Level ◽  
Two Sides

Working in Architecture design studios environment requires various activities. Interaction, communication and meetings could affect the speech intelligibility and the speech privacy conditions. Students Areas with a more silent environment are needed with a minimized level of distraction from surrounding activities, while teamwork and discussion areas with a high level of interaction need a good speech intelligibility. One of the more important elements which can improve the open spaces acoustical conditions is the partitions between workstations.The main purpose of this work is to evaluate the acoustical performance of four partitions types in open plan offices; 1.10m two sides partition height, 1,50m front side partitions, 1,50m one side partitions and 1.50 two sides partitions. This Study was conducted in the College of Architecture, Imam Abdulrhman Bin Faisal University, KSA. Based on ISO 3382-3, Speech Transmission Index, STI in the nearest workstation, Distraction distance rD, privacy distance rP, A-weighted background noise level L,A,B and A-weighted SPL of speech at 4 metres L,A,S,4m have been measured. It was found that the best results can be obtained by 1.50m front side and 1.50m two sides partitions.

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