A Variable Rate Voice Coder using LPC-10E

reportActive / Technical Report | Accession Number: ADA464963 | Open PDF

Abstract:

This paper describes the current status of an ongoing research and development effort whose objective is a variable rate voice coder with a high degree of speech intelligibility and natural voice quality with an average throughput rate near 1200 bs. The voice coder described here is based on the DoD FS 1015 LPC-10 2400 bs vocoder. A method of silence detection and the use of variable size data frame formats to distinguish voiced and unvoiced frames are discussed. This voice coding technology is a critical component in supporting efficient integrated services over bandwidth constricted radio networks, satellite systems, and handheld portable communications devices.

Author(s):
Macker, J. P. ; Adamson, R. B.
Author Organization(s):
NAVAL RESEARCH LAB WASHINGTON DC COMMUNICATION SYSTEMS BRANCH
Descriptive Note:
Technical Memorandum
Pagination:
0003

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
NRL/5520-92
Monitor Series:
NRL/MR/5520
 Subject Terms
Joint Capability Areas:
JCA_6_Net Centric; JCA_6.1_Information Transport; JCA_6.4.1_Secure Information Exchange; JCA_5_Command and Control; JCA_6.4_Information Assurance; JCA_5.3_Planning; JCA_8_Building Partnerships; JCA_8.1.1_Inform Domestic and Foreign Audiences; JCA_8.1_Communicate
Modernization Areas:
Space
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*ALGORITHMS, *INPUT OUTPUT PROCESSING, *VARIABLES, *CODERS, *INTELLIGIBILITY, EXCITATION, VOICE COMMUNICATIONS, REDUCTION, THROUGHPUT, SPEECH, HAND HELD
Field(s)/Group(s):
Numerical Mathematics, Voice Communications, Logistics, Military Facilities and Supplies
Keyword(s):
*VOICE CODERS, *VOICED AND UNVOICED, MULTIMEDIA COMMUNICATIONS, FS 1015 LPC 10 TRANSMITTER
Report Date:
1994 Jul 12
Creation Date:
2007 Apr 18