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Thursday, August 6, 2020 | History

2 edition of Study of the audibility of impulsive sounds found in the catalog.

Study of the audibility of impulsive sounds

S. A. Fidell

Study of the audibility of impulsive sounds

by S. A. Fidell

  • 339 Want to read
  • 33 Currently reading

Published by National Aeronautics and Space Administration; for sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Va. in [Washington] .
Written in English

    Subjects:
  • Hearing.,
  • Noise.

  • Edition Notes

    Other titlesAudibility of impulsive sounds.
    Statementby Sanford Fidell and Karl S. Pearsons.
    SeriesNASA contractor report, NASA CR-1598, NASA contractor report ;, NASA CR-1598.
    ContributionsPearsons, Karl S., joint author., Bolt, Beranek, and Newman, inc., Langley Research Center.
    Classifications
    LC ClassificationsTL521.3.C6 A3 no. 1598, QP461 A3 no. 1598
    The Physical Object
    Paginationiv, 59 p.
    Number of Pages59
    ID Numbers
    Open LibraryOL5016281M
    LC Control Number76607367

    Industrial impulse noise causes in general about dB more severe hearing loss than steady state noise. The exposure to impulsive noise is often composed of very rapid sound bursts that have short duration and low energy content. As a consequence the audibility is lower than the actual level of . (Special Announcement) As a precaution, all patients and visitors coming to Boys Town Hospital and clinics will be screened upon arrival, Boys Town Hospital has postponed non-urgent, non .

      The amplitude is the magnitude of sound pressure change within a sound wave. Sound amplitude can be measured in pascals (Pa), though its more common to refer to the sound (pressure) level as Sound intensity(dB,dBSPL,dB(SPL)), and the perceived sound level as Loudness(dBA, dB(A)). Sound intensity is flow of sound energy per unit time through a fixed area. I, pp. ; cited in Sandra Claflin-Chalton and Gordon J. MacDonald, Sound and Light Phenomena: A Study of Historical and Modern Occurrences (McLean, Virginia: The MITRE Corporation, ), 6. K. W. Golde in The Foretan, October , p. 7; from the Buffalo Evening News of March 2,

    Sound fields References 3 Sound Perception Introduction Human Hearing Apparatus and mechanism Outer ear Middle ear Inner ear Signal processing in the brain Localization Masking and audibility Vestibular system Alternate Sound Perception Mechanisms   In people with attention deficit hyperactivity disorder (ADHD), being impulsive is often one of the more challenging symptoms. "[I]mpulsivity is one of the core symptoms of ADHD," according.


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Study of the audibility of impulsive sounds by S. A. Fidell Download PDF EPUB FB2

Study of the audibility of impulsive sounds. [Washington] National Aeronautics and Space Administration; for sale by the Clearinghouse for Federal Scientific and Technical Information, Springfield, Va.

[] (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors.

AUDIBILITY OF IMPULSIVE SOUNDS IN ENVIRONMENTAL NOISE T.H. Pedersen DELTA Acoustics & Vibration, Akademivej, Bygning, Lyngby, Denmark Tel.: +45 45 93 12 11 / Fax: +45 45 93 19 90 / Email: [email protected] Keywords: ENVIRONMENTAL NOISE, IMPULSIVE SOUND, AUDIBILITY, ANNOYANCE ABSTRACT This paper gives an introduction and some preliminary.

Journal of Sound and Vibration () 21(4) THE AUDIBILITY OF LOW-FREQUENCY SOUNDS t L. WHITTLE, S. COLLINS AND D. ROBINSON National Physical Laboratory, Teington, Middlesex, England (Received 10 December ) Contours of equal loudness and threshold of hearing under binaural free-field conditions for the frequency range Hz Cited by: This study shows that the audibility of impulsive sounds.

single impulsive sound as used in this study does not cause a brief response in harbor porpoises at SELs below around 65 dB re 1 µPa. Framework for calculating distribution of sound exposure levels for impulsive sound events for the purpose of environmental sound assessment.

Latest standards in the field of environmental testing Exposure to loud noise causes initially a temporary threshold shift, which becomes permanent after repeated exposure to loud impulsive sounds as in.

Audible definition, capable of being heard; loud enough to be heard; actually heard. See more. A short speech segment and an impulsive finger snap were used as direct sound, and a simple reverberation model with frequency-dependent T60 between and s was used to create stimuli with different DRRs.

The stimuli were spatialised using non-individual head-related transfer functions and played back over headphones. The human ear is most sensitive – that is, the threshold of audibility is lowest – for sounds around 3, Hz.

For reference purposes, the frequency of the middle “C” key. xii, pages: 25 cm Includes bibliographical references and index 1. Preliminaries to a study of musical acoustics: Musical acoustics: the meeting place of music, vibration physics, auditory science and craftsmanship ; The organization of this book ; A brief operating manual -- 2.

In a previous study, ∼4 dB TTS was elicited in this porpoise, but despite 8 dB higher single-shot and cumulative exposure levels (up to dB re 1 μPa 2 s) in the present study, the porpoise showed no significant TTS at hearing frequencies 2, 4, or 8 kHz. There were no changes in the study animal's audiogram between the studies or.

Hearing in laboratory animals is a topic that traditionally has been the domain of the auditory researcher. However, hearing loss and exposure to various environmental sounds can lead to changes in multiple organ systems, making what laboratory animals hear of consequence for researchers beyond those solely interested in hearing.

ISBN: OCLC Number: Description: xii, pages: illustrations ; 25 cm: Contents: 1. Preliminaries to a study of musical acoustics: Musical acoustics: the meeting place of music, vibration physics, auditory science and craftsmanship ; The organization of this book ; A brief operating manual Impulsive sounds, alone and in sequence: Sequences of impulsive.

Acoustics definition, the branch of physics that deals with sound and sound waves. See more. The true threshold of audibility in the presence of background noise is specific to species, sound sources present, and location.

Qualitatively we expect background noise will more readily mask wide-band sounds (e.g., from airguns) than narrowband sounds (e.g., from sonars) because less sound energy is concentrated inside a single critical band.

Human ear cannot detect sound frequencies less than 20 vibrations per second i.e. 20 Hz. So any sound below this frequency will be inaudible sound for humans.

In the high-frequency range, the human ear cannot detect frequencies above vibrations per second (20 kHz) and the amplitude of the wave would be dependent on the loudness of the sound. reflect, absorb or screen sound. This can lead to associated increases or decreases in the sound pressure level at a particular listening position.

• Noise levels are measured with sound level meters that provide various signal averaging and analysis options. The. The method aims at predicting the prominence of impulsive sounds in correspondence with average subjective judgements.

Based on the predicted prominence, P, a graduated adjustment, KI, to the measured LAeq is defined. The method is based on the presumption that the annoyance increases with increasing audibility (perceived prominence) of the.

Except for the selection of a frequency-gain response that maximized high-frequency audibility, the methods and AAI calculations were similar to those used in the Souza and Turner () study.

For linear-amplified speech, overall results revealed that listeners with flat and sloping hearing losses showed similar improvements in intelligibility. An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones.

The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours. By definition, two sine waves of differing frequencies are said to have equal-loudness level.

Reflected sounds influence the timbre and spatial character of live and reproduced sounds. Most investigations of reflections have focused on the performance of live sounds in large halls. Merrill Hiscock, in Handbook of Neurolinguistics, Perception. Studies of auditory perception provide some of the most convincing evidence of early functional asymmetries.

This evidence has been summarized by Best ().An initial dichotic listening study with infants between the ages of 22 and days (Entus, ) yielded a right-ear advantage (REA) for detection of.Infrasound, sometimes referred to as low-frequency sound, describes sound waves with a frequency below the lower limit of audibility (generally 20 Hz).Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high.

The ear is the primary organ for sensing infrasound, but at higher intensities it is possible to. A person with 50% audibility may be able to identify 70% of single words and 95% of sentences. 5 Audibility will be further compromised by the presence of varying background noise and classroom reverberation levels of second or greater.

6 However, this can largely be negated by the use of personal FM during large-group instruction and.