Speech privacy (peach piracy) exists when a conversation cannot be understood even if it can be heard. There are 4 levels of speech privacy; normal, confidential, inaudibility and none. Normal speech privacy exists when someone can only partially understand the telephone conversation or the meeting in an adjacent office cubical without having to stop, listen… Read more »
Front Vs. Rear Projection – Questions and Answers
From an entertainment point of view there is probably nothing more impressive than going to a first run cinema (front projection) and being enveloped by the large screen and catchy plot. That’s great if the purpose is for entertainment or large scale audiences. However, if the purpose is to explain a project topic or concept,… Read more »
Tech Notes: Hydraulic Pile Drivers Work Out of a Tight Spot, Quietly
Driving piles is typically considered one of the noisiest, most disruptive activities at a construction job site. The increased noise and vibration levels can disrupt ongoing client activity as well as adjacent neighbors. However, new hydraulic pile-driving equipment may change this. In a recent project to expand the paper making capacity of a Charleston, South… Read more »
Tech Notes: Ceiling Mounted Microphones – A Solution or a Problem?
With hopes of eliminating tabletop or podium microphones, End Users, Designers and Architects frequently ask, “What about sticking them on the ceiling?” Usually, what seems like an easy solution is not the best solution. Ceiling mounted microphones are not recommended for the following reasons: First, loudspeakers are typically mounted in the ceiling. This places ceiling… Read more »
Acoustical Terms – What Are They/What Do They Mean?
Recently we were asked “What is the difference between STC, NRC, and NC and are they interrelated?” STC or Sound Transmission Class, describes how much sound a wall or a floor/ceiling construction will block from one room to the next. A good analogy to an STC rating is the fire rating of a partition. A… Read more »
Office Acoustics
A question we are frequently asked by Project Managers is how can we improve the acoustical privacy between offices and work stations? The level of acoustical privacy is defined as the amount of conversation that can be heard and understood between adjacent offices or work stations. Before we can improve the acoustical privacy we must… Read more »
New Acoustical Product at AIA National Convention ’92!
While attending the recent AIA ’92 National Convention in Boston we took the opportunity to search the trade floor for new building materials with acoustical benefits. The following summarizes our finds: Among the more promising displays were acoustical wall and finish materials that would provide a durable interior finish while helping solve acoustical concerns. Pyrok… Read more »
Acoustics and ADA
The Americans with Disabilities Act (ADA) has stirred up much controversy over the past year. This article will provide some practical guidelines for the public accommodations portion of these requirements. The new ADA hearing assistance requirements are not really new for Californians since the 1988 UBC, with the California Title 24 Amendment, has required hearing… Read more »
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