home *** CD-ROM | disk | FTP | other *** search
- U.S. Department of Defense
- LPC-10 2400 bps Voice Coder
- Release 1.0
- October 1993
-
-
- Contents:
- README - This file
- FAQ - Frequently Asked Questions items for LPC and CELP
- lpc55 - Fortran code for LPC-10 Version 55
- lpc55-C - C code for LPC-10
- data - Sample speech files, containing:
- dam9.spd - Sample input speech file
- dam9_lpc55.spd - Speech processed by LPC-10
- abtool_1.2 - Sun GUI tool for playing listening comparisons
- between speech files (this is a beta version)
-
- The distribution file has been compressed with the GNU compression
- program gzip version 1.2.3, available from archives such as ftp.uu.net and
- wuarchive.wustl.edu. To unpack it, use the commands:
-
- gunzip lpc-1.0.tar (uncompress the archive file)
- tar xvf lpc-1.0.tar (extract the contents of the archive)
-
- (For distribution on pcfs floppy disks (IBM PC format), the file names may
- not appear exactly as shown above.)
-
- Documentation on using the above programs is included in README files
- in each directory. Documentation describing the internal operation of
- LPC-10 is currently available only in hardcopy format. We will include
- more extensive documentation with future releases of this package.
-
- All development of LPC-10 has been done in Fortran, so the Fortran
- code has been written for flexible and easy use in a research environment.
- The C version was translated from the Fortran to assist in porting LPC
- to Digital Signal Processors (DSPs), and does not have the debugging
- features or I/O flexiblility of the Fortran version. Both versions
- have been tested on a Sun SPARCstation-10 running Solaris 2.2 and
- SunOS 4.1.2.
-
- The speech files are in 16 bit linear format, sampled at 8000 Hz. There
- are no headers on these files, so some manipulation may be required to
- play them on your system. The following alias will play speech files on
- the Sun speakerbox:
-
- alias play 'audioconvert -i pcm16,mono,raw,r=8k -f sun \!* | audioplay'
- play dam9.spd
-