Narrowband Voice System.
Abstract
The problem of how to accommodate more simultaneous users in a given bandwidth communications channel was examined. It was determined that voice signals could be reduced in bandwidth by 50 percent. Two speech formants, F1 and F3, were filtered from the speech signal and frequency translation performed to form a compact audio signal. At the receiver this process is reversed and the formants returned to their normal spectral positions. Intelligibility scores of 94 percent were obtained in a listening test conducted using the two formants F1 (250-650 Hz) and F3 (1950-2450 Hz). (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1979
- Accession Number
- ADA074445
Entities
People
- Raymond Roy Hitchcock
Organizations
- Naval Postgraduate School