Accession Number:

AD0626618

Title:

TRANSDUCER AND INTERPHONE SYSTEM FOR OPERATION IN HIGH-AMBIENT NOISE.

Descriptive Note:

Quarterly progress rept. no. 4, 1 Apr-30 Jun 65,

Corporate Author:

CBS LABS STAMFORD CONN

Personal Author(s):

• Rosenheck,Allan J.
• Torick,Emil L.
• DiMattia,Alfred L.

Report Date:

1965-07-30

Pagination or Media Count:

60.0

Abstract:

The report discusses work performed toward development of an improved Transducer and Interphone System for operation in high-ambient noise. Work progressed toward development of a tubular microphone shield. Included was an evaluation of several acoustical materials, and the fabrication of a practical shield. Earphone enclosures with LFC Low Frequency-Coupled volumes were constructed and tested, and results are presented herein. Performance of the present communications system was evaluated and compared with expected performance of a CBS Laboratories-designed system. Psychoacoustic tests were performed to relate articulation index with phonetically-balanced word testing. Basic electronic design of the system was completed. Each system comprises three crewmember units and an interphone amplifier. Circuits for achieving automatic gain control and squelch operation are described, including four methods for accomplishing automatic gain control. Detailed circuit descriptions as well as system designs were incorporated into the interphone amplifier, and are also described. Author

Descriptors:

• ARMOR
• TRANSDUCERS
• NOISE
• EARPHONES
• ACOUSTIC INSULATION
• HELMETS

Subject Categories:

• Surface Transportation and Equipment
• Non-Radio Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE