Accession Number:

ADA048846

Title:

Linear Noise-Attenuating Earphone.

Descriptive Note:

Final rept. 28 May 76-21 Aug 77,

Corporate Author:

ELECTRO-VOICE INC BUCHANAN MI MILITARY ENGINEERING DEPT

Personal Author(s):

Report Date:

1977-11-04

Pagination or Media Count:

98.0

Abstract:

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

Subject Categories:

  • Electrical and Electronic Equipment
  • Human Factors Engineering and Man Machine Systems
  • Protective Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE