Accession Number:

AD0270201

Title:

TECHNIQUE INVESTIGATION FOR AIRCRAFT VOICE RECORDING

Descriptive Note:

Corporate Author:

NATIONAL AVIATION FACILITIES EXPERIMENTAL CENTER ATLANTIC CITY N J

Personal Author(s):

• JEFFERSON,FRANCIS W.

Report Date:

1961-08-01

Pagination or Media Count:

1.0

Abstract:

Tests were conducted at the National Aviation Facilities Experimental Center utilizing two aircraft, a C-131 and a Grumman Gulfstream, to investigate several cockpit voice recording techniques for the design and development of a transport aircraft voice recorder system. Binaural recording, noise cancellation inserted prior to recording, and filter techniques such as combined T-notch and band-pass, voice intelligibility equipment singularly, voice intelligibility equipment combined with the T-notch filter, and voice intelligibility equipment combined with the band-pass filter were investigated. The voice intelligibility equipment, employed in a single filter, demonstrated the most satisfactory filtering technique for recording cockpit voice. Author

Descriptors:

• *SOUND REPRODUCTION SYSTEMS
• *VOICE COMMUNICATIONS
• AIRBORNE
• AIRCRAFT CABINS
• AIRCRAFT EQUIPMENT
• AVIATION ACCIDENTS
• COCKPITS
• INTELLIGIBILITY
• MAGNETIC TAPE
• MICROPHONES
• RECORDING SYSTEMS
• TRANSPORT AIRCRAFT

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE