A Program to Develop Audio Aids to Night Vision.
Abstract
The purpose of this program was to obtain information on utilization of acoustical phenomena for target location, recognition and identification by suitable devices which in turn may be used as aids for more effective use of night viewing devices. Considerable attention was paid to finding techniques which made sounds more intelligible; the human auditory analytic apparatus was to be supplemented, not replaced. A combination of suitable ground-coupled infrasound pickups and an infrasonic-to-audio converter enabled a listener to detect the sound of footsteps at a range of 200 yards or more, about four times what he could do with his unaided ears. With a crude ground-coupled binaural listening system, an impact signal could be located to about plus or minus 15 degrees. Air coupled listening systems were tested that gave ranges of about 40 yards for footsteps and 190 yards for intelligibility of a man's voice, each about a twofold improvement over the unaided ear.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1964
- Accession Number
- ADA004106
Entities
People
- Joseph Markin
- Michael Fein