Accession Number:

ADA056286

Title:

Electret Noisecancelling Microphone.

Descriptive Note:

Final rept. 28 Jul 76-28 Dec 77,

Corporate Author:

J M R SYSTEMS CORP SALEM NH

Personal Author(s):

• Mackiernan,Donald W.
• Woodward,Alan P.

Report Date:

1978-04-01

Pagination or Media Count:

71.0

Abstract:

This document covers the technical details of advanced development work performed to adapt the electret principle for the purpose of improving noise-cancelling microphones for military use. A major objective was to achieve a flat frequency response over a greater bandwidth and noise cancellation characteristics extending to a higher frequency cut-off point than previously possible with dynamic units. Author

Descriptors:

• *MICROPHONES
• *ELECTRETS
• DYNAMIC RESPONSE
• FAR FIELD
• BIAS
• NEAR FIELD
• FREQUENCY RESPONSE
• VERY LOW FREQUENCY
• CAPACITORS
• DIAPHRAGMS(MECHANICS)

Subject Categories:

• Electrical and Electronic Equipment
• Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE