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Cross-Spectrum Acoustics Inc. offers Sound & Vibration Consulting Services
Inter-Noise 2006 presentation: Paper (PDF) | Discussion
Bose QC-1 headphone noise reduction measurements
ASA/Noise-Con 2005 presentation: Paper | Slides (PDF)
B&K 1/2-inch mic. adapters for GenRad 1986/1987 calibrators for sale
Microphone Measurement Services
Octave-Band center frequency values derivation
My perceptual coding experience
Dan Wiggins on Design Goals
A/C frequency-weighting derivations
Apr 22, 2010
Earlier today, NPR’s
On Point call-in
program featured “acoustic ecologist”
Gordon Hempton, author of
One Square Inch of Silence: One Man’s Search for Natural Silence in a Noisy World
This will actually tie into an upcoming blog post, but that will have to wait for another day.
Apr 21, 2010
FYI, InfoComm is offering scholarships for undergrad students interested in audiovisual fields (which includes “audio, video, telecommunications, electronics, technical aspects of the theater, data networking, software development and information technology”).
Details are available on the InfoComm scholarship page.
Apr 16, 2010
Quick takes:
- Paul de Vos (who is well known around rail-noise circles) has started a blog.
- The April 25th BAS meeting will play host to a Hearing Conservation Workshop, a “a new approach to promoting awareness of the ever-increasing problem of noise and music-induced hearing loss … targeted to students and professionals in the audio and music industries.” It might be of interested to folks concerned about noise-induced hearing loss. (BAS site hasn’t been updated as of Friday morning)
Apr 12, 2010
From a Washington Post real estate column:
If it becomes necessary to prove that you have a problem, you should retain an acoustical engineer, at your expense. This professional can determine whether the noise in your unit is within the acceptable decibel range. The engineer should also inspect the upstairs unit, so he can provide suggestions as to how to resolve the problem.
I appreciate a referral as much as the next person, but unfortunately the time to take care of noise problems in a condo is before things are actually built and people have moved in. You can hire us after the fact (and I’ll be happy to take your money) but chances are there will be little we can do absent major structural renovations.
If you are moving into a multi-family structure and you have concerns over noise, don’t just ask if the builder took noise into account because the answer will always be “yes” (and the builder may even sincerely believe they’ve mitigated noise). Ask for test results (specifically Field Sound Transmission Class (FSTC) and Field Impact Insulation Class (FIIC) ratings. Major deficiencies are going to require ripping apart and rebuilding walls, floors and ceilings so you should be sure before you sign on the dotted lines and move in.
Apr 05, 2010
Two informative articles:
- Nick Miller of HMMH has delved in the history of the Ldn/DNL 65 criterion
- John Storyk of Walters-Storyk Design Group discusses the effects of glass surfaces on interior acoustical environments, complete with TL data for various un/laminated glass configurations.
A follow-up to an earlier article about a patient death at Mass General Hospital — A Federal inquiry found that a contributing factor to the death was “alarm fatigue”:
Additionally, federal investigators said the volume for a separate audible crisis alarm on the patient’s bedside monitor was turned off the night before by an unknown person. Mass. General executives had previously told the Globe that this crisis alarm had been inadvertently turned off.
But investigators for the Centers for Medicare & Medicaid Services said that desensitization to alarms that actually sounded also was a factor in the patient’s death.