Research on Improving Room Sound Field of Exhibition Building

2014 ◽  
Vol 1065-1069 ◽  
pp. 1634-1637
Author(s):  
Qian Li ◽  
Dong Sheng Liu
Keyword(s):  
Background Noise ◽  
Speech Intelligibility ◽  
Simulation Analysis ◽  
Sound Field ◽  
Reverberation Time ◽  
High Background ◽  
Exhibition Space ◽  
Commercial Activities ◽  
Broadcasting System ◽  
High Background Noise

Generally, there is a high background noise and long reverberation time and poor speech intelligibility in exhibition space due to its big crowd and often commercial promotional activities so that communication is very hard, commercial activities broadcasting system is also difficult to ensure that customers can clearly hear the propaganda content. In this paper, through measured background noise of the new exhibition center in Chengdu, we found the acoustic problem in exhibition space, then we did simulation analysis in some exhibition building and took some acoustical process to get a good sound field.

Effects of Classroom Noise on Students and Teachers in Greece

2003 ◽  
Vol 96 (2) ◽  
pp. 539-544 ◽  
Author(s):  
Dimitris Skarlatos ◽  
Manolis Manatakis
Keyword(s):  
High School ◽  
Background Noise ◽  
Reverberation Time ◽  
Noise Levels ◽  
High Background ◽  
High Noise ◽  
Significant Percentage ◽  
Time Period ◽  
High Background Noise

Measurements inside 32 occupied high-school classrooms during the courses showed that the measured long-term equivalent noise levels are high. A significant percentage of students and teachers found these levels unacceptable. The observed noise levels depend on the time period of the course, the age, and the number of the students in each classroom. The large reverberation time and the high background noise are responsible for the measured high noise level.

scholarly journals Multiple signals and male spacing affect female preference at cocktail parties in treefrogs

2009 ◽  
Vol 277 (1685) ◽  
pp. 1247-1252 ◽  
Author(s):  
Christina Richardson ◽  
Thierry Lengagne
Keyword(s):  
Background Noise ◽  
Spatial Separation ◽  
Signal Design ◽  
High Background ◽  
Hyla Arborea ◽  
Male Density ◽  
Multicomponent Signals ◽  
The Face ◽  
Spatial Unmasking ◽  
High Background Noise

Effective acoustic communication in the face of intense conspecific background noise constitutes a constant sensory challenge in chorusing and colonial species. An evolutionary approach suggests that behavioural and environmental constraints in these species should have shaped signal design and signalling behaviour to enable communication in noisy conditions. This could be attained both through the use of multicomponent signals and through short-term adjustments in the spatial separation of calling males. We investigated these two hypotheses in a chorusing anuran, the hylid Hyla arborea , through a series of phonotaxis experiments conducted within a six-speaker arena in a high background noise situation, by presenting females with male calls containing either single or multiple attractive call components, and by modifying distances between speakers. We found that female ability to discriminate attractive calls increased when several attractive call components were available, providing novel evidence that the use of multicomponent signals enhances communication in complex acoustic conditions. Signal discrimination in females also improved with speaker separation, demonstrating that within natural choruses, spatial unmasking conditioned by male density and spatial separation probably improves female discrimination of competing males. Implications of these results for the accuracy of mate choice within choruses are discussed.

Poor Listening Conditions Impair Memory for Intelligible Lectures: Implications for Acoustic Classroom Standards

2009 ◽  
Vol 16 (3) ◽  
pp. 257-265 ◽  
Author(s):  
Robert Ljung ◽  
Patrik Sörqvist ◽  
Anders Kjellberg ◽  
Anne-Marie Green
Keyword(s):  
University Students ◽  
Background Noise ◽  
Speech Intelligibility ◽  
Broadband Noise ◽  
Speech Signals ◽  
Reverberation Time ◽  
Signal To Noise ◽  
Memory And Learning ◽  
What Is Said ◽  
Degraded Speech

This paper reports two experiments on the effects of degraded speech signals on memory for spoken lectures. Experiment 1 showed that broadband noise impairs university students' memory for a spoken lecture, even though the participants heard what was said. Experiment 2 showed that reverberation has detrimental effects to school adolescents' memory for spoken lectures, similar to broadband noise. The results suggest that poor listening conditions (resulting from background noise and/or long reverberation time) impair memory and learning, even if the conditions allow the listeners to hear what is said. Since the goal for students and pupils attending to lectures is to remember the lecture rather than just hearing what is said, the results presented here indicate that standards for acceptable signal-to-noise ratios and reverberation times in buildings designed for learning should consider the distinction between speech intelligibility and memory. Standards should be based on memory criteria instead of intelligibility criteria.

scholarly journals A technical description of the Balloon Lidar Experiment (BOLIDE)

2020 ◽  
Vol 13 (10) ◽  
pp. 5681-5695
Author(s):  
Bernd Kaifler ◽  
Dimitry Rempel ◽  
Philipp Roßi ◽  
Christian Büdenbender ◽  
Natalie Kaifler ◽  
...  
Keyword(s):  
High Resolution ◽  
Time Resolution ◽  
Background Noise ◽  
Flight Performance ◽  
Vertical Resolution ◽  
Backscatter Coefficient ◽  
High Background ◽  
Polar Mesospheric Clouds ◽  
High Background Noise ◽  
Mesospheric Clouds

Abstract. The Balloon Lidar Experiment (BOLIDE) was the first high-power lidar flown and operated successfully on board a balloon platform. As part of the PMC Turbo payload, the instrument acquired high-resolution backscatter profiles of polar mesospheric clouds (PMCs) from an altitude of ∼ 38 km during its maiden ∼ 6 d flight from Esrange, Sweden, to northern Canada in July 2018. We describe the BOLIDE instrument and its development and report on the predicted and actual in-flight performance. Although the instrument suffered from excessively high background noise, we were able to detect PMCs with a volume backscatter coefficient as low as 0.6×10-10 m−1 sr−1 at a vertical resolution of 100 m and a time resolution of 30 s.

Improved affine projection subband adaptive filter for high background noise environments

2017 ◽  
Vol 137 ◽  
pp. 356-362 ◽  
Author(s):  
Haiquan Zhao ◽  
Zongsheng Zheng ◽  
Zhongyu Wang ◽  
Badong Chen
Keyword(s):  
Adaptive Filter ◽  
Background Noise ◽  
High Background ◽  
Affine Projection ◽  
High Background Noise ◽  
Subband Adaptive Filter

scholarly journals A technical description of the Balloon Lidar Experiment BOLIDE

2020 ◽  
Author(s):  
Bernd Kaifler ◽  
Dimitry Rempel ◽  
Philipp Roßi ◽  
Christian Büdenbender ◽  
Natalie Kaifler ◽  
...  
Keyword(s):  
High Resolution ◽  
Time Resolution ◽  
Background Noise ◽  
Flight Performance ◽  
Vertical Resolution ◽  
Backscatter Coefficient ◽  
High Background ◽  
Polar Mesospheric Clouds ◽  
High Background Noise ◽  
Mesospheric Clouds

Abstract. The Balloon Lidar Experiment (BOLIDE) was the first high-power lidar flown and operated successfully onboard a balloon platform. As part of the PMC Turbo payload, the instrument acquired high resolution backscatter profiles of Polar Mesospheric Clouds (PMCs) from an altitude of ∼38 km during its maiden ∼6 day flight from Esrange, Sweden, to Northern Canada in July 2018. We describe the BOLIDE instrument and its development and report on the predicted and actual in-flight performance. Although the instrument suffered from excessively high background noise, we were able to detect PMCs with a volume backscatter coefficient as low as 0.6 × 10−10 m−1 sr−1 at a vertical resolution of 100 m and a time resolution of 30 s.

scholarly journals An Entropy-Based Anti-Noise Method for Reducing Ranging Error in Photon Counting Lidar

Entropy ◽  
2021 ◽  
Vol 23 (11) ◽  
pp. 1499
Author(s):  
Mingwei Huang ◽  
Zijing Zhang ◽  
Jiaheng Xie ◽  
Jiahuan Li ◽  
Yuan Zhao
Keyword(s):  
Background Noise ◽  
Photon Counting ◽  
Laser Pulses ◽  
Avalanche Photodiode ◽  
High Background ◽  
Noise Current ◽  
Ranging Error ◽  
Geiger Mode ◽  
High Background Noise ◽  
The Difference

Photon counting lidar for long-range detection faces the problem of declining ranging performance caused by background noise. Current anti-noise methods are not robust enough in the case of weak signal and strong background noise, resulting in poor ranging error. In this work, based on the characteristics of the uncertainty of echo signal and noise in photon counting lidar, an entropy-based anti-noise method is proposed to reduce the ranging error under high background noise. Firstly, the photon counting entropy, which is considered as the feature to distinguish signal from noise, is defined to quantify the uncertainty of fluctuation among photon events responding to the Geiger mode avalanche photodiode. Then, the photon counting entropy is combined with a windowing operation to enhance the difference between signal and noise, so as to mitigate the effect of background noise and estimate the time of flight of the laser pulses. Simulation and experimental analysis show that the proposed method improves the anti-noise performance well, and experimental results demonstrate that the proposed method effectively mitigates the effect of background noise to reduce ranging error despite high background noise.

scholarly journals Temporal variation in acoustic and visual signalling as a function of stream background noise in the Bornean foot-flagging frog, Staurois parvus

2017 ◽  
Vol 1 (1) ◽  
pp. 1-1 ◽  
Author(s):  
T. Ulmar Grafe ◽  
Joremy A. Tony
Keyword(s):  
Background Noise ◽  
Temporal Dynamics ◽  
Multimodal Communication ◽  
Visual Signals ◽  
High Background ◽  
Dynamic Selection ◽  
Multimodal Signals ◽  
High Background Noise ◽  
Noisy Conditions ◽  
Visual Signalling

High background noise can interfere with signal detection and perception. Bornean foot-flagging frogs,Staurois parvus, live along noisy streams and use both acoustic and visual signals to communicate. It remains unclear why acoustic signalling is retained given that visual signalling appears to have clear advantages under these noisy conditions. We hypothesized that temporal dynamics in stream noise have shaped the multimodal communication system inS. parvuswith acoustic signalling at an advantage under more quiet conditions, whereas visual signals will prevail when the noise of rushing water is high after rains. We found that as predicted, maleS. parvusincreased foot flagging and decreased advertisement calling when presented with playbacks of stream noise compared to less noisy pre-playback conditions. Such context-dependent dynamic-selection regimes are recently gaining wider attention and enhance our understanding of the flexibility seen in the use of multimodal signals inS. parvus.

scholarly journals Acoustic quality assessment in a classroom through simulations and measurements

2021 ◽  
Vol 9 (72) ◽  
Author(s):  
Eriberto Oliveira do Nascimento ◽  
Paulo Henrique Trombetta Zannin
Keyword(s):  
Background Noise ◽  
Speech Intelligibility ◽  
Reverberation Time ◽  
Vocal Health ◽  
Quality Requirements ◽  
Transmission Index ◽  
Speech Transmission ◽  
Acoustic Quality ◽  
Acoustic Comfort ◽  
Minimum Requirements

The acoustic quality in a classroom directly impacts the educational relationship between the student and the teacher, reducing speech intelligibility. In addition, inadequate acoustic comfort burdens the vocal health of teachers. This study evaluated a classroom at the Federal University of Paraná, Campus Centro Politécnico, to verify its acoustic quality. The measurements of the acoustics descriptors: Reverberation Time (RT), Definition (D50), Central Time (Ts), Early Decay Time (EDT) were performed according to the ISO 3382-2 standard, concerning Noise Curves (NC) and Background Noise (BGN) these were evaluated by the  NBR 10152 and S12.2 standards. The Speech Transmission Index (STI) was measured according to IEC 60268-16 and evaluated according to ISO 9921. The useful-detrimental ratio (U50) and the other descriptors were simulated in the ODEON software version 11. Thus, the results showed that the evaluated room did not meet the minimum requirements in terms of acoustic quality, for the descriptors RT, STI, Ts, D50, RF, and NC. Simultaneously, the RT and STI were also outside the limits established by the German and Finnish standards. Therefore, it is concluded that the evaluated classroom did not reach the minimum acoustic quality requirements.

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