A method to virtually extend reverberation time of measured impulse responses without losing room coloration

2019 ◽  
Vol 146 (4) ◽  
pp. 2933-2933
Author(s):  
Lévy LeBlanc ◽  
Philippe-Aubert Gauthier ◽  
Alain Berry
Keyword(s):  
Reverberation Time ◽  
Impulse Responses

scholarly journals Effect of phoneme variations on blind reverberation time estimation

Acta Acustica ◽  
2020 ◽  
Vol 4 (1) ◽  
pp. 3
Author(s):  
Andrea Andrijašević
Keyword(s):  
Time Estimation ◽  
Multiple Comparison ◽  
Reverberation Time ◽  
Impulse Responses ◽  
Estimation Errors ◽  
Significance Level ◽  
Frequency Bands ◽  
Interaction Terms ◽  
Multiple Comparison Procedure

This study focuses on an unexplored aspect of the performance of algorithms for blind reverberation time (T) estimation – on the effect that speech signal’s phonetic content has on the value of the estimate of T that is obtained from the reverberant version of that signal. To this end, the performance of three algorithms is assessed on a set of logatome recordings artificially reverberated with room impulse responses from four rooms, with their T20 value in the [0.18, 0.55] s interval. Analyses of variance showed that the null hypotheses of equal means of estimation errors can be rejected at the significance level of 0.05 for the interaction terms between the factors “vowel”, “consonant”, and “room”, while the results of Tukey’s multiple comparison procedure revealed that there are both some similarities in the behaviour of the algorithms and some differences, where the latter are stemming from the differences in the details of algorithms’ implementation such as the number of frequency bands and whether T is estimated continuously or only on the selected, the so-called speech decay, segments of the signal.

Reverberation time measurement by the product of two room impulse responses

2009 ◽  
Vol 70 (1) ◽  
pp. 231-243 ◽  
Author(s):  
Raffaele Dragonetti ◽  
Carmine Ianniello ◽  
Rosario A. Romano
Keyword(s):  
Time Measurement ◽  
Reverberation Time ◽  
Impulse Responses

The Assessment of Sports Halls – The Analysis of Reverberation Time, Strength and Clarity

2014 ◽  
Vol 899 ◽  
pp. 517-521
Author(s):  
Martin Jedovnický ◽  
Peter Tomašovič
Keyword(s):  
Sound Source ◽  
In Situ Measurement ◽  
Reverberation Time ◽  
Impulse Responses ◽  
Frequency Range ◽  
Time Strength

This article presents the results of analysis of impulse responses which were obtained from in situ measurement in sports hall called Karlovka. The experiment deals with the comparison of two positions of the measuring microphone which had the identical distance from the sound source and the reverberation time was different in the whole frequency range. The attention was focused on the analysis of suitability of Reverberation time RT, Strength G and Clarity C80 to be used for the assessment of sports halls.

scholarly journals Logatome and Sentence Recognition Related to Acoustic Parameters of Enclosures

2017 ◽  
Vol 42 (3) ◽  
pp. 385-394
Author(s):  
Jedrzej Kocinski ◽  
Edward Ozimek
Keyword(s):  
Speech Recognition ◽  
Reverberation Time ◽  
Impulse Responses ◽  
Acoustic Parameters ◽  
Music School ◽  
Sentence Recognition ◽  
Speech Reception ◽  
Middle Range ◽  
Transmission Index ◽  
Speech Transmission

AbstractThe 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.

scholarly journals Uncertainties of reverberation time estimation via adaptively identified room impulse responses

2016 ◽  
Vol 139 (3) ◽  
pp. 1093-1100
Author(s):  
Lifu Wu ◽  
Xiaojun Qiu ◽  
Ian Burnett ◽  
Yecai Guo
Keyword(s):  
Time Estimation ◽  
Reverberation Time ◽  
Impulse Responses

Subjective Response to Foot-Fall Noise, Including Localization of the Source Position

2011 ◽  
Vol 97 (5) ◽  
pp. 904-908 ◽  
Author(s):  
Jonas Brunskog ◽  
Ha Dong Hwang ◽  
Cheol-Ho Jeong
Keyword(s):  
Subjective Response ◽  
Reverberation Time ◽  
Source Position ◽  
Impulse Responses ◽  
Surface Source ◽  
Lightweight Structures ◽  
Impact Noise ◽  
Vibration Field ◽  
Floor Structure ◽  
Current Standards

Although an impact noise level is objectively evaluated the same according to current standards, a lightweight floor structure is often subjectively judged more annoying than a heavy homogeneous structure. The hypothesis of the present investigation is that the subjective judgment of impact noise is more annoying if the source position can be localized; lightweight structures have a more localized radiation than heavy structures. For the heavy structures the reverberant vibration field is dominant, therefore having a distributed radiation. A listening test is used to assess the subjective annoyance, using simulated binaural room impulse responses, with sources being a moving point source or a non-moving surface source, and rooms being a room with a reverberation time of 0.5 s or an anechoic room. The paper concludes that no strong effect of the source localization on the annoyance can be found.

scholarly journals A Study of Classroom Acoustics and Its Effects of Listeners’ Locations on Speech Intelligibility

1970 ◽  
Vol 7 (1) ◽  
pp. 64-71
Author(s):  
Chukiet Sodsri
Keyword(s):  
Linear Systems ◽  
Background Noise ◽  
Speech Intelligibility ◽  
Noise Source ◽  
Reverberation Time ◽  
Impulse Responses ◽  
Acoustical Parameters ◽  
Classroom Acoustics ◽  
Common Process ◽  
Speech Clarity

Attending a class and listening to a lecture given by an instructor is a common process in Thailand education. Ability of learning is affected by the ability of hearing the instructors’ speech. Acoustical environments of the classroom, hence, can influence speech intelligibility. In this research, acoustical parameters and listeners’ locations in classrooms and their effects on the speech intelligibility were studied. By using an assumption of linear systems of the classrooms, the room reverberation, background noise, and other classroom acoustical factors can be implicated as impulse responses of the system. Maximum length sequence was used to identify the impulse responses at listeners’ locations in the classrooms. A clean speech, recorded in a semi-anechoic room, was convoluted with a series of the measured classrooms’ impulse responses to yield a set of simulated reverberant speeches that the listener at each location in the classes would have heard. A number of volunteers were invited to test an ability of understanding the speech. The experimental results showed that the reverberation and background noise at listeners’ locations severely affected the speech intelligibility. A classroom, that seemed to have a good averaged reverberation time, did not always yielded good speech clarity for all the locations in the class. In fact, for the classroom used in the study, the rear section of the class was poor for intelligibility and the back corner closed to a noise source was the worse location for speech hearing.

scholarly journals Low Cost Omnidirectional Sound Source Utilizing a Common Directional Loudspeaker for Impulse Response Measurements

2018 ◽  
Vol 8 (9) ◽  
pp. 1703 ◽  
Author(s):  
Nikolaos Papadakis ◽  
Georgios Stavroulakis
Keyword(s):  
Standard Deviation ◽  
Impulse Response ◽  
Sound Source ◽  
Mean Absolute Error ◽  
Low Cost ◽  
Absolute Error ◽  
Primary Method ◽  
Reverberation Time ◽  
Impulse Responses ◽  
Acoustic Parameters

Alternative low-cost sources (e.g., balloons, gun fires) are used for impulse response measurements when a dodecahedron speaker is not available. This study sets to explore the applicability of a method utilizing a common directional loudspeaker as a sound source. For this purpose measurements were performed in three spaces with three different common directional loudspeakers. Different placements of the loudspeakers were performed (twelve positions similar to the twelve positions of the faces of a dodecahedron speaker, different rotations of the loudspeakers for a total sum of twenty six and fourteen positions). The impulse responses obtained were added up creating a single impulse response for each case. Comparisons of the acoustic parameters measured with the proposed method and with a dodecahedron speaker are presented and suggest the expected mean absolute error and standard deviation for similar measurements. Reverberation time measurements show a mean absolute error of less than 0.08 s, as compared with measurements with a dodecahedron speaker. The proposed method can be the primary method for measuring impulse responses when a dodecahedron speaker is not available. Suggested improvements may lead to better omnidirectionality as compared with a dodecahedron loudspeaker, and set the method applicable to be utilized for auralization purposes.

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