Accession Number : ADA134707

Title :   Jam-Resistant Speech Encoding.

Descriptive Note : Phase rept. Oct 81-Sep 82,

Corporate Author : MITRE CORP BEDFORD MA

Personal Author(s) : Poole,M A ; Rifkin,R

PDF Url : ADA134707

Report Date : Jun 1983

Pagination or Media Count : 66

Abstract : This report describes techniques that provide increased jam resistance for digitized speech. Methods for increasing the jam resistance of pulse code modulated data are analyzed and evaluated in listener tests. Special emphasis is placed on new voice encoding approaches that take advantage of a spread spectrum system with a variable (or multiple)-data-rate/variable (or multiple)-AJ capability. Methods for matching a source to a channel in a jamming environment are investigated. Several techniques that provide about a 4 dB increase in jam resistance have been identified. (Author)

Descriptors :   *Antijamming, *Vocoders, *Voice communications, *Coding, Pulse code modulation, Spread spectrum, Jamming, Speech, Environments

Subject Categories : Countermeasures
      Voice Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE