Page 44 - April 2008

WorkshopTM reminds viewers on a weekly basis to read the equipment manuals and always wear your safety glasses, we should remember that hearing protection is essential to pro- tect our ears from the insidious effects of noise.AT
Disclaimer: “The findings and conclusions in this report are those of the author and do not necessarily represent the views of the National Institute for Occupational Safety and Health (NIOSH).”
References
1 ANSI/ASA S12.68–2007. American National Standard Methods of Estimating Effective A-Weighted Sound Pressure Levels When Hearing Protectors are Worn (Acoustical Society of America, Melville, NY, 2007).
2 Environmental Protection Agency. Code of Federal Regulations 40 211B Hearing Protective Devices. U.S. Environmental Protection Agency, 1978.
3 T. Miller, “An analysis of octave band sound pressure level data- bases and various metrics based on the databases studied,” Master's thesis, North Carolina State University, Rayleigh, NC, 1995.
4 D. Gauger and E. H. Berger, “A New Hearing Protector Rating: The Noise Reduction Statistic for Use with A Weighting (NRSA),” a report prepared at the request of the U. S. Environmental Protection Agency, reviewed and approved by ANSI S12/WG11, E•A•R 04-01/HP, Indianapolis, IN (2004).
5 W. J. Murphy, E. H. Berger, D. Gauger, B. Witt, R. McKinley, S. Gerges, and W. Ahroon, “Results from the National Institute for Occupational Safety and Health/Environmental Protection
Agency NIOSH/EPA Interlaboratory Comparison of American National Standards Institute ANSI S12.6-1997 Methods A and B,” J. Acoust. Soc. Am. 120(5, Pt. 2), 3160 (2006).
Bill regularly takes his son Aaron out to the ballgame. Aaron roots for the Reds, Bill for the Cubs.
William J. Murphy is co-leader for the Hearing Loss Prevention Team in the Division of Applied Research and Technology, National Institute for Occupational Safety and Health (NIOSH) in Cincinnati. A graduate of Iowa State University (B.S. and M.S.), he com- pleted a Ph.D. in physics at Purdue University and joined NIOSH in 1992. He was commissioned as a scientist officer in
1993 and holds the rank of Captain in the U.S. Public Health Service. Currently he is developing ratings for the perform- ance of passive and active hearing protection devices. He is an active member of the Acoustical Society of America, is a member of the Technical Committee on Noise, and serves as the Vice Chair of ANSI Standards Committee S12 to develop national and international acoustic standards on noise. Outside of work, Bill arranges music, plays trombone, guitar and piano, leads worship at church, and teaches high-school physics to home-schooled students. Bill and his wife Deb school their three children at home.
7,158,647
43.38.Ja ACOUSTIC DEVICE
Henry Azima et al., assignors to New Transducers Limited 2 January 2007 (Class 381Õ152);
filed in United Kingdom 2 September 1995
This is a long and unusual patent. It contains more than 70 illustrations and a ten-page summary of planar loudspeaker design,
including the extensive prior work patented by New Transducers Limited. In effect, the patent can serve as a handbook of the state of the art in this field. Anyone interested in planar loudspeakers is advised to order a copy.—GLA
42 Acoustics Today, April 2008