Swept Sine against MLS in room acoustics with music signals as background noise

2008 ◽  
Vol 123 (5) ◽  
pp. 3617-3617
Author(s):  
Joel P. Paulo ◽  
J. Luis Bento Coelho
Keyword(s):  
Background Noise ◽  
Room Acoustics ◽  
Music Signals

A Preliminary Investigation of the Perceived Smallest Sound Duration Change in a Room

1997 ◽  
Vol 4 (3) ◽  
pp. 197-209
Author(s):  
D.-U. Jeong ◽  
F.R. Fricke
Keyword(s):  
Noise Level ◽  
Background Noise ◽  
Speech Intelligibility ◽  
Preliminary Investigation ◽  
Room Acoustics ◽  
Reverberation Time ◽  
Background Noise Level ◽  
Intelligibility Test ◽  
Sound Duration

The present work aims at producing a test, similar to a speech intelligibility test, which can be used to rate the acoustic quality of rooms for music. Listeners' perceptions of the duration of sounds were investigated in an attempt to find a useful indicator of the acoustics of a room for music and speech. The research design was based on a discrimination task and a 2AFC experimental procedure. Two experiments were carried out in which two acoustic variables, reverberation time and background noise level, were varied and listeners' smallest perceivable sound duration changes were measured. It was found that the listeners' duration perceptions were significantly influenced by the reverberation time and background noise level of the listening environment, and that these discrimination procedures may form the basis for room acoustics assessments.

Robustness Against DA/AD Conversion

2008 ◽  
pp. 248-259
Author(s):  
Martin Steinebach
Keyword(s):  
Background Noise ◽  
Audio Signal ◽  
Audio Watermarking ◽  
Quantization Noise ◽  
Room Acoustics ◽  
Digital Audio ◽  
Test Results ◽  
Digital Audio Watermarking ◽  
Important Challenge ◽  
Analogue To Digital

This chapter discusses the robustness of digital audio watermarking algorithms against digital to analogue and analogue to digital conversions. This is an important challenge in many audio watermarking applications. We provide an overview on distortions caused by converting the signal in various scenarios. This includes environmental influences like background noise or room acoustics when taking microphone recordings as well as sound sampling effects like quantization noise. The aim is to show the complexity of influences that needto be taken into account. Additionally, we show test results of our own audio watermarking algorithm with respect to analogue recordings using a microphone which proves that a high robustness in this area can be achieved. To improve even the robustness of algorithms, we briefly introduce strategies against downmixing and playback speed changes of the audio signal.

Room acoustics criteria and measurements of lobbies and atria for various building types

2021 ◽  
Vol 263 (4) ◽  
pp. 2420-2429
Author(s):  
Ted Pyper ◽  
Matt Whitney ◽  
David Porter
Keyword(s):  
Background Noise ◽  
Performing Arts ◽  
Previous Experience ◽  
Room Acoustics ◽  
Design Criteria ◽  
Design Teams ◽  
Circulation Zone ◽  
Event Space ◽  
Point Of Interest ◽  
Design And Construction

The lobby or atrium for a building may serve many purposes -- entryway, welcome area, circulation zone, and architectural point of interest. Increasingly, lobbies and atria serve more and more functions: gathering area, presentation area, music and event space, study area, and dining, among other uses. Since variable acoustics in lobby spaces are not typically feasible or desirable, the acoustical design of lobby spaces must strike a balance for the variety of events planned for the space. Working with design teams and owners to understand the needs of each space, acoustical design criteria evolve based on project-specific needs and previous experience. In this presentation, lobbies are considered for various building types, including education facilities, student commons, museums, and performing arts buildings. In addition to studies of existing spaces and modeling of buildings in design, this presentation expands on the authors' previous efforts by documenting the measured reverberation and background noise in several lobbies and atria after the completion of design and construction.

THE EVALUATION OF THERMAL, ROOM ACOUSTICS AND DAYLIGHT PERFORMANCE OF OLD INDRAPURI MOSQUE IN ACEH BESAR, INDONESIA

2020 ◽  
Vol 6 (1) ◽  
pp. 57
Author(s):  
Laina Hilma Laina Hilma ◽  
Izziah Izziah ◽  
Erna Meutia ◽  
Zulfian Zulfian
Keyword(s):  
Background Noise ◽  
Sound Pressure ◽  
Room Acoustics ◽  
Comfort Zone ◽  
High Background ◽  
12Th Century ◽  
History Of ◽  
High Background Noise ◽  
The Government ◽  
Daylight Performance

This paper aims at assessing the performance of thermal, room acoustics and daylight of the old Indrapuri mosque. Indrapuri mosque is located in Aceh Besar and built in the 12th century. The mosque is famous with the history of Aceh; therefore, it belongs to the cultural heritage object conserved by the government. After some decades, the facade has been maintained and conserved. However, some conservation steps were shifted from the principle ones such as using traditional techniques and materials. The data were collected using survey and mechanical measurement. The results show that some replacements cause some spatial discomforts such as higher indoor thermal performance. It is indicated in Olgyay’s bioclimatic chart which also shows that the air movement should be increased to reach the comfort zone. The mosque acoustics performance has slightly high background noise, while the sound pressure level and reverberation time still meet the standard. The daylight remains good. This is shown when there is no electrical light is switched on during the day including daytime prayer i.e. Zuhr (1 pm) and 'Ashr (4 pm).

Microdensitometer—computer correlation analysis of ultrastructural periodicity

1978 ◽  
Vol 36 (2) ◽  
pp. 32-33
Author(s):  
D.R. Ensor ◽  
C.G. Jensen ◽  
J.A. Fillery ◽  
R.J.K. Baker
Keyword(s):  
Correlation Analysis ◽  
Background Noise ◽  
Computer Control ◽  
Optical Diffraction ◽  
Screw Thread ◽  
Straight Line ◽  
Computer Storage ◽  
Correlation Process ◽  
Electron Microscope Image ◽  
Fixed Beam

Because periodicity is a major indicator of structural organisation numerous methods have been devised to demonstrate periodicity masked by background “noise” in the electron microscope image (e.g. photographic image reinforcement, Markham et al, 1964; optical diffraction techniques, Horne, 1977; McIntosh,1974). Computer correlation analysis of a densitometer tracing provides another means of minimising "noise". The correlation process uncovers periodic information by cancelling random elements. The technique is easily executed, the results are readily interpreted and the computer removes tedium, lends accuracy and assists in impartiality.A scanning densitometer was adapted to allow computer control of the scan and to give direct computer storage of the data. A photographic transparency of the image to be scanned is mounted on a stage coupled directly to an accurate screw thread driven by a stepping motor. The stage is moved so that the fixed beam of the densitometer (which is directed normal to the transparency) traces a straight line along the structure of interest in the image.

Use of a Mild-Gain Hearing Aid by Middle-Age Normal-Hearing Adults Who Do and Do Not Self-Report Trouble Hearing in Background Noise

2020 ◽  
Vol 29 (3) ◽  
pp. 419-428
Author(s):  
Jasleen Singh ◽  
Karen A. Doherty
Keyword(s):  
Hearing Aids ◽  
Background Noise ◽  
Middle Age ◽  
Hearing Aid ◽  
Normal Hearing ◽  
Self Report ◽  
Hearing Aid Use ◽  
Hearing Handicap ◽  
Before And After ◽  
Hearing Problems

Purpose The aim of the study was to assess how the use of a mild-gain hearing aid can affect hearing handicap, motivation, and attitudes toward hearing aids for middle-age, normal-hearing adults who do and do not self-report trouble hearing in background noise. Method A total of 20 participants (45–60 years of age) with clinically normal-hearing thresholds (< 25 dB HL) were enrolled in this study. Ten self-reported difficulty hearing in background noise, and 10 did not self-report difficulty hearing in background noise. All participants were fit with mild-gain hearing aids, bilaterally, and were asked to wear them for 2 weeks. Hearing handicap, attitudes toward hearing aids and hearing loss, and motivation to address hearing problems were evaluated before and after participants wore the hearing aids. Participants were also asked if they would consider purchasing a hearing aid before and after 2 weeks of hearing aid use. Results After wearing the hearing aids for 2 weeks, hearing handicap scores decreased for the participants who self-reported difficulty hearing in background noise. No changes in hearing handicap scores were observed for the participants who did not self-report trouble hearing in background noise. The participants who self-reported difficulty hearing in background noise also reported greater personal distress from their hearing problems, were more motivated to address their hearing problems, and had higher levels of hearing handicap compared to the participants who did not self-report trouble hearing in background noise. Only 20% (2/10) of the participants who self-reported trouble hearing in background noise reported that they would consider purchasing a hearing aid after 2 weeks of hearing aid use. Conclusions The use of mild-gain hearing aids has the potential to reduce hearing handicap for normal-hearing, middle-age adults who self-report difficulty hearing in background noise. However, this may not be the most appropriate treatment option for their current hearing problems given that only 20% of these participants would consider purchasing a hearing aid after wearing hearing aids for 2 weeks.

Selecting the Optimal FM System for Children With Cochlear Implants

2008 ◽  
Vol 18 (1) ◽  
pp. 19-24
Author(s):  
Erin C. Schafer
Keyword(s):  
Speech Recognition ◽  
Cochlear Implants ◽  
Empirical Research ◽  
Background Noise ◽  
Signal To Noise Ratio ◽  
Evidence Based ◽  
Signal To Noise ◽  
Speech Processor ◽  
System Input ◽  
Optimal Type

Children who use cochlear implants experience significant difficulty hearing speech in the presence of background noise, such as in the classroom. To address these difficulties, audiologists often recommend frequency-modulated (FM) systems for children with cochlear implants. The purpose of this article is to examine current empirical research in the area of FM systems and cochlear implants. Discussion topics will include selecting the optimal type of FM receiver, benefits of binaural FM-system input, importance of DAI receiver-gain settings, and effects of speech-processor programming on speech recognition. FM systems significantly improve the signal-to-noise ratio at the child's ear through the use of three types of FM receivers: mounted speakers, desktop speakers, or direct-audio input (DAI). This discussion will aid audiologists in making evidence-based recommendations for children using cochlear implants and FM systems.

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