Linear Noise-Attenuating Earphone.
Final rept. 28 May 76-21 Aug 77,
ELECTRO-VOICE INC BUCHANAN MI MILITARY ENGINEERING DEPT
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This document covers the technical details of work performed to improve the linearity and attenuation of the earphone and earcup respectively in Flying Type Helmet SPH-4. The results of the effort provide an immersible, salt resistant, rugged and low distortion earphone with a flat frequency response fitting an 8 dB response envelope when placed in the newly designed earcup which is lighter in weight but more rugged than the present standard SPH-4. The new ear-cushion utilizes a low permeability foam for improved attenuation in the low and mid-frequency range, which is covered with a urethane film for low temperature flexibility and body oil resistance. Author
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