Accession Number:

ADA270900

Title:

Template Based Low Data Rate Speech Encoder

Descriptive Note:

Interim rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

Report Date:

1993-09-30

Pagination or Media Count:

15.0

Abstract:

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 communication, and narrowband integrated voicedata systems. An 800-bs voice encoding algorithm is presented which is an extension of the 2400-bs LPC. To construct template tables, speech samples of 420 speakers uttering 8 sentences each were excerpted from the Texas Instrument - Massachusetts Institute of Technology TIMIT Acoustic-Phonetic Speech Data Base. Speech intelligibility of the 800-bs voice encoding algorithm measured by the diagnostic rhyme test DRT is 91.5 for three male speakers. This score compares favorably with the 2400-bs LPC of a few years ago.

Subject Categories:

  • Voice Communications

Distribution Statement:

APPROVED FOR PUBLIC RELEASE