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alt.sci.physics.acoustics
The soundness of the science of sound.

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  • Can science data be art?
    Have you ever seen a scientific related image and thought "wow, that's
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    I came across a couple of university internal "art of science"
    competitions where scientists present images from their research and
    compete based on beauty... why should it be only within universities?
    I created a simple gallery at [link] where

  • noise reduction material for window, noise from church bells
    Hi,
    I desperately need an opinion from someone with a good understanding
    of materials or noise reduction in general.
    I live close to a church and the church bell makes extreme loud noise.
    The noise is really loud, going through my windows. I want to put an
    extra layer of window - obviously it should be transparent. Should

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  • Structural Noise propagation
    Hi
    There is a plant room with a noise level of approx. 90dB(A). The room
    ´s boundaries are made of solid concrete. Does anybody know how to
    calculate or arrive to an approximate value of how much noise will
    leak to the room upstairs via the side walls (the room upstairs has
    the same shape as the plant room, therefore the sidewalls are

  • Broadband Ultrasonic Transmitter
    I am looking for a broadband ultrasonic transmitter, with a minimum
    frequency response of 15kHz- 65kHz (larger the better). Anyone know of
    a good source?
    Thanks
    -scott

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  • Introducing new acoustical consulting firm specializing in Oil & Gas industry
    INTRODUCING FDI ACOUSTICS:
    FDI Acoustics Inc. is a recently formed acoustical consulting firm that
    provides advice to the energy industry on environmental noise related
    issues. The firm specializes in Noise Impact Assessments, Noise Control
    Studies and Comprehensive Sound Surveys. The firm consists of four

  • Car Stero Noise Crackdown; it's about time..
    Dave Fagen (Fagen Acoustical Consultants)
    Contributes this little bit of news:
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    The City of Sarasota, FL is fed up with booming car stereos and are
    getting tough.
    [link]
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  • Frequency enhancing in an auditorium by menas of temperature change
    Hi
    I have recently seen a system in an auditorium (mainly used for
    classical music) where a temperature rise system was installed
    underneath the stage. The idea was that by rising the temperature at
    different parts of the stage they could enhance certain frequencies.
    Unfortunately I couldn´t elaborate too much on this with the auditorium

  • Acoustics for Coliseums
    Hi
    I have been trying to get information re. acoustic conditioning in
    coliseums for music performances, but so far I have found pretty much
    nothing.
    There is plenty of info for theaters/auditoriums.
    I assume that installing reflection panels at the roof along with
    absorption panels (to control first reflections and rev time) might

  • Faraday's Law correct? ?
    Faraday's Law correct? ?
    -- The scientific concept of the Declaration gave me the strength
    I split my guts of a long-premeditated
    Potential is cutting
    A. Alternator
    B. DC (commutator) Generators
    C. unipolar DC -
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  • Acoustics Test & Validation Manager position at Apple, Inc.
    Acoustic Validation Manager
    Location: Cupertino, CA
    Job description:
    Manage group of engineers responsible for validation of acoustic,
    speech, and audio performance of iPhone and iPod products. Establish
    internal test processes and test plans. Develop, maintain and manage
    objective and subjective test methods and tools to enable performance

  • Apple's iPhone is hiring Acoustics Engineers!
    Apple’s iPhone is hiring Acoustics Engineers!
    Apple's iPhone Engineering Division is building a world class
    Acoustics Development Team and looking to hire passionate acoustical
    engineers that want to innovate technology solutions that impact the
    world. This is your chance to work in fast paced environment where

  • cancelling electric motor noise and the meaning of the coherence function
    I have a problem that maybe someone can help with.
    I have a small plastic box (about 10cm(W) by 6 cm(L) by 4cm(D)
    Inside the box is a small electric motor. This motor also drives a few
    moving parts such as gears, etc.
    Poking through a hole in the box is a small microphone to "listen" to
    the outside world.

  • Third octave band and CADNA-A
    Hi :+) . Has anyone got an advice. I am doing a project to assess
    impact of
    proposed entertainment noise upon residents. Will be monitoring third
    octaves bands on site and want to then build a CADNA-A model of post
    development with entertainment noise, car park movements, beeping
    horns in etc. However the modelled output at the receiver (monitoring

  • other google group
    Hi :+) . Has anyone got an advice. I am doing a project to assess
    impact of
    proposed entertainment noise upon residents. Will be monitoring third
    octaves bands on site and want to then build a CADNA-A model of post
    development with entertainment noise, car park movements, beeping
    horns in etc. However the modelled output at the receiver (monitoring

  • Acoustic Boundary Elements : Open Source in Fortran
    The boundary element method (BEM) is one of the most important
    simulation methods in acoustics.
    I have initiated open source projects on the BEM in acoustics on
    [link]
    My book "The Boundary Element Mehod in Acoustics" (as pdf) can also be
    downloaded free on
    [link]

  • 01 dB Meter - Blue Solo
    Hi all,
    I am considering the purchase of this Blue Solo meter and the software
    components from 01 dB and would like to know if anyone could comment
    on the meter and how useful it is.
    I will be using it for general consulting work RT60, General noise
    measurements, Envro logging etc.
    The brochure claims are pretty impressive and the memory capacity seem

  • Absorption Value For Gravel
    I've been working on a project analyzing the propagation of outdoor
    noise and need to determine the amount of ground absorption a gravel
    surface will provide. The area in question would be covered with 6"
    of 1.5 - 2" stone. So far I haven't been able to find any information
    on commonly accepted absorption values for gravel or other types of

  • How to Acoustically Insulate a Rendered Concrete Wall
    Hi List,
    I am living apartment and I have new neighbors who can be a little
    noisy at times and it is disturbing my sleep.
    The common wall between my bedroom and their family room is rendered
    125 mm concrete wall, with all air gaps sealed. The width of the wall
    is about 5m and standard height.
    From my bed in the room most normal speech is inaudible, but

  • Low frequency noise - hum sufferers
    If you know any Hum Sufferers out there, they may be interested to look at
    [link]
    This introduces our new project on helping people to cope with noise
    problems which cannot be solved technically.
    For example, the Hum which plagues some people. Or noises which meet their
    criteria, but still cause upset.

  • Environmental noise: measurement interval
    Hello,
    I'd like to know if there is a way (or some kind of guide) to define
    the duration of environmental noise measurement (how long to measure)
    as a funciton of noise parameters such as: LAeq, SPL, L99, L90, L10,
    L1...?
    I know that percentile levels can provide an indication of the degree
    of fluctuation in noise readings, but how to use this parameters and

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  • Comparison of ten room testing microphones
    Folks,
    People often ask which affordable microphones I recommend for measuring
    their room. To answer this question I tested ten popular microphones ranging
    from an inexpensive DIY model to a Josephson with Microtech Gefell capsule
    costing $1,800, and wrote up the results for this article:
    [link]

  • ask the standard for floor vibration
    Hi:
    we need to build a lab where to raise the mice for experiment.
    did anyone know the standard for floor vibration on this lab.
    I know the ISO 2631 mention the vibration criteria for office ,
    residential site .
    and Gordon give the standards for VC-A,VC-B...
    Did anyone know the vibration criteria for the Lab where to raise

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  • Re: Fabrics with acoustical properties
    There are no such fabrics. To block out noise you require two factors,
    mass and rigidity.
    d

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  • Starter Pistol for Reverb Time Measurements
    Hi, I've been looking into purchasing a starter pistol to use as a
    noise source for reverb time measurements. I've discovered that there
    are many different guns that shoot blanks on the market, and I'm not
    sure what would be appropriate for this application. Does anyone have
    any experience in this area and could provide a suggestion on what to

  • the height of point source
    What is the minimum height of point source above the ground if I set
    K0 as 0 to simulate the spherical radiation? Thanks.

  • frequency response of headphones
    Hi,
    in the context of physiological recordings with small animals (guinea
    pig) in a small anechoic chamber, I would like to use headphones as
    speakers between, say, 100 Hz and 35 kHz. I'm interested in the
    flattest response possible. I've selected a bunch of headphones, but
    the shape of their frequency response is never given on their

  • Re: flat speaker up to 40 kHz
    How flat and it must be on axis, right ? How far away ?
    I crosposted.
    greg

  • Trigeneration/CCHP
    I am trying to do some fact finding on this type of eco-friendly system in
    terms of noise sources. My understanding is that the system comprises:
    either a gas or diesel engine driven generator inside an acoustic enclosure
    dry air cooler
    either absorption or adsorption chiller (not sure whether in noise terms

  • translatory shift bitmap object in Cadna A
    Hi, everyone
    In Cadna A, I am trying to translatory shifts the bitmap object, such
    as Xnew=Xold-23, Ynew=Yold-15. However, when I use "modify object" ->
    'transformation.." and set the new and old points' coordinates, the
    bitmap object does not move. what is the problem? Thanks.

  • Active Noise Cancelling and ultra low-frequent singularities!
    Hi,
    In active noise cancelling systems for head-phones there seems to be
    a
    focus on ultra low frequent singularities (< a few Hz). Can anyone
    tell me how these are related to some physical attributes of the
    plant
    (speaker,microphone, amp and acoustical path in between transducers)?
    Cheers
    Tom

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  • ASTM E336 Field STC Test Question
    When doing an FSTC test of a partition in an existing building, is it
    recommended to keep the sound source off the floor to reduce flanking
    through the floor structure from one room to another? We are using
    the Norsonic 260 speaker system.
    This is a new hotel with insulated, staggered stud (wood) walls

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  • Picket fence effect
    Does anyone have a source for information on the picket fence effect
    in acoustics, particularly as it relates to finned walls in an
    auditorium? Each fin is 2" thick by 7" deep spaced at 9" on center.
    These fins are at both sidewalls and continue over the ceiling.
    Thanks,
    Rob Miller

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  • Room resonance in live performance -Guy Macon
    Any chance that you are really bad at estimating frequency? A rough
    rule of thumb to remember is that sound in air travels at about 1000
    feet per second and the wavelength of a 1 KHz tone is about one foot.
    So the wavelength at 2KHz about half a foot. Room resonance tends
    to occur at much lower frequencies than that.

  • Room resonance in live performance
    Well I assume that is what it is. Scenario musician/s in a pub, ie non-ideal
    environment. , so hard wall surfaces, using a pair of speakers on tripod
    stands so about head height. Fine at low sound level, but sometime into the
    set they turn the level up.
    I'm guessing, that at some frequency about 2KHz, the room starts ringing,

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  • Is the info on this website true?
    Hi:
    The following website discusses the effects of sound waves on the human
    body. Is the info true? I ask because it really looks weird?
    [link]
    Thanks,
    Radium