Page 4 - Spring 2009

Acoustics Today
A Publication of the Acoustical Society of America
Volume 5, Issue 2 April 2009
Cover: On a bright fall morning last October there was a historic meeting among three industry stalwarts that was of particular interest to the acoustics community. Gerhard Sessler and James West returned to New Jersey, the home state of Bell Labs where they both started their professional careers, to be inducted into the “New Jersey Inventors’ Hall of Fame.” Ray Stata, founder of Analog Devices and a pioneer of MEMS devices, was passing through on business. The three got together at the beautiful Reeves-Reed arboretum in Summit, New Jersey for a discussion on the evolution of consumer micro- phones towards MEMS. (Source: Analog Devices)
Articles:
4 A History of Consumer Microphones: The Electret Condenser Microphone Meets Micro- Electro-Mechanical-Systems—Gary W. Elko and Kieran P. Harney
The inventors of the Electret Condenser Microphone meet with a Micro-Electro-Mechanical-Systems pioneer to discuss microphones.
14 Lloyd’s Mirror—Image Interference Effects—
William M. Carey
The image-interference effect common to optics and acoustics is well-known as Lloyd’s mirror—but who Lloyd was and what led to his discovery is hardly known at all.
21 What Is So Special about Shoebox Halls?— Marshall Long
Envelopment, envelopment, envelopment.
Departments:
26 Standards: How Many People Will Be Awakened By Noise Tonight?—Nicholas P. Miller and Paul D. Schomer Can you predict the likelihood that outdoor noise will awaken you on your next trip to Manhattan?
33 National News—Elaine Moran
Acoustical news from around the country.
38 International News—Walter G. Mayer Acoustical news from around the world.
40 Books and Publications—Dick Stern
New and recent reports, publications, and brochures on acoustics.
42 Instrumentation—Dick Stern
New and recent acoustic instrumentation and news about acoustic instrument manufacturers.
Business Directory
45 Business card advertisements
46 Classified
Classified advertisements, including positions offered and positions desired.
48 Index to Advertisers
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