High-Quality 800-b/s Voice Processing Algorithm.
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
The 2400-bs linear predictive coder LPC is currently being widely deployed to support tactical voice communication over narrowband channels. However, there is a need for lower-data-rate voice encoders for special applications improved performance in high-bit-error conditions, low- probability-of-intercept LPI voice communications, and integrated voicedata systems. As a result of continued research, the intelligibility of very-low- data-rate 600 to 800 bs voice processors has steadily improved, from the upper 70s about a decade ago to the middle 80s in recent years. This report presents a new 800-bs voice-encoding method that produces an intelligibility score of 92 measured by the Diagnostic Rhyme Test DRT. This high score compares favorably with that attained by the 2400-bs LPC.
- Voice Communications