DEVELOPMENT OF A SMALL MICROPHONE SUITABLE FOR USE IN A NEW, SMALL, LIGHT-WEIGHT, ORAL-NASAL BREATHING OXYGEN MASK.
Abstract
A noise cancelling microphone was partially developed for use in aircraft oxygen masks. Several types of microphones were studied and examined. Various models were constructed and analyzed. Some word articulation testing was conducted and some preliminary environmental tests were made. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1957
- Accession Number
- AD0692803
Entities
People
- Robert K. Duncan