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Release Version 3.2
This responds to your request for our 4800 bps
Code Excited Linear Predictive (CELP) voice coder (version 3.2) that complies
with Federal Standard 1016 [1]. Restrictions on this package and its contents
are described below.
This release is being provided in a DOS format (translated from UNIX based on the command unixtodos. The original filenames have been truncated to DOS filename limitations, otherwise the code is exactly the same as was used on Sun Sparcstations for the development of this code. It is suggested that this code be run on a Sun Workstation. If the code is run on a PC, some changes (between UNIX and DOS formats) will be needed. The U.S. Government is not prepared to make these changes and will not support these changes.
The CELP source code contained in this release was developed by the U.S. Government in conjunction with a contract to AT&T Bell Laboratories Acoustics Research Department and with the help of many others cited in [2, 3, 4]. Except where noted, all other code included in this package was developed strictly by and is the property of the U.S. Government. Additional code in the package is provided as a courtesy to aid your development and the U.S. Government is under no obligation to support it.
An earlier version of the coder (1.33r) achieved the results reported in [2] under the "Phase 3 CELP V.33 scores, December 1988".
INSTALLATION
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Since this package was developed under BSD UNIX, it is highly recommended that it be installed on a machine supporting the BSD UNIX environment (e.g., Sun, Alliant, or Convex). For installation of specific programs, follow the directions in README files located in the directories listed below.
CONTENTS
--------
This release subdirectory structure is described below. Please refer to README files in these directories for further information. (Note, celp3_2 and celp3_2c are only programs and are not to be confused with the actual Federal Standard 1016!)
subdirectory description
------------ -----------
celp3_2/ A FORTRAN implementation of Federal Standard 1016
celp3_2c/ C language translation of above FORTRAN
speech/ Input speech for "processed/" (.swp files byte swapped)
processed/ Processed speech, bit stream and log files (Sun Sparc)
diskio/ Utilities to generate analysis files for Sungraph
tools/ Utilities to aid in development
REFERENCES
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[1] Fenichel, R., "Federal Standard 1016", National Communications
System, Office of Technology and Standards, Washington, DC 20305-2010, 14
February 1991 (printed by GSA).
[2] Kemp, David, P., Retha A. Sueda and
Thomas E. Tremain, "An Evaluation of 4800 bps Voice Coders",
Proceedings of the IEEE International Conference on Acoustics, Speech and
Signal Processing (ICASSP), 1989, p. 200-203.
[3] Campbell, Joseph P. Jr.,
Vanoy C. Welch and Thomas E. Tremain, "The New 4800 bps Voice Coding
Standard", Military and Government Speech Tech, 1989.
[4] Welch, Vanoy
C., Thomas E. Tremain and Joseph P. Campbell, Jr., "A Comparison of U.S.
Government Standard Voice Coders", IEEE Military Communications Conference
(MILCOM) Conference Record, 1989, p. 269-273.
Campbell, Joseph P. Jr.,
Vanoy C. Welch and Thomas E. Tremain, "An Expandable Error-Protected 4800
bps CELP Coder (U.S. Federal Standard 4800 bps Voice Coder)", Proceedings
of ICASSP, 1989, p. 735-8. (and Proceedings of Speech Tech, 1989, p. 338-341.)
Tremain, Thomas E., Joseph P. Campbell, Jr and Vanoy C. Welch, "A 4.8
kbps Code Excited Linear Predictive Coder", Proceedings of the Mobile
Satellite Conference, 3-5 May 1988, p. 491-496.
Tremain, Thomas E., Joseph P. Campbell, Jr, Vanoy C. Welch, James R.
Goble and Mary A. Kohler, "DoD 4.8 kbps Standard (Proposed Federal
Standard 1016 Voice Coder)", Program and Abstracts of the IEEE Workshop on
Speech Coding for Telecommunications, 1989, p. 4.
Rahikka, Douglas J.,
Thomas E. Tremain, Vanoy C. Welch and Joseph P. Campbell, Jr, "CELP Coding
for Land Mobile Radio Applications," ICASSP, 1990, p. 465.
Joseph P. Campbell, Jr., Thomas E. Tremain and Vanoy C. Welch, "The DoD
4.8 kbps Standard (Proposed Federal Standard 1016)", "Advances in
Speech Coding", Chaper 4.1, Kluwer Academic Publishers, 1990.
Joseph
P. Campbell, Jr., Thomas E. Tremain and Vanoy C. Welch, "The Federal
Standard 1016 4800 bps CELP Voice Coder", "Digital Signal Processing,
A Review Journal," Volume 1, Number 3, Academic Press, July 1991.
Tutorials:
Fallside, Frank and William Woods, Computer Speech Processing, Prentice
Hall International, 1985, Chapter 4 (by Bishnu Atal).
Atal, Bishnu, Peter Kroon, et. al., Report on Low Rate Speech Coding
Research, Speech Processing Research Contract MDA904-84-C-6010, 20 May 1987, "Code-Excited
Linear Predictive (CELP) Coding at 4.8-7.2 kb/s", (by Peter Kroon).
DOCUMENTATION
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Soon to be released: NCS Technical Information Bulletin on FS 1016. (note reference [1] above). (early 1992 ??)
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