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Organization: Alexa Crawls

Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.

Collection: Alexa Crawls

Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.

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CELP 3.2a & LPC-10

• Platform: Sun (the makefiles and source can be modified for other platforms)
• Description: CELP is lossy compression technqiue. The US Department of Defences's Federal-Standard-1016 based 4800 bps code excited linear prediction voice coder version 3.2a (CELP 3.2a). Fortran and C simulation source codes.
• Availability: By anonymous ftp from:
  ftp://ftp.super.org/pub/speech/celp_3.2a.tar.Z
  Or from the comp.speech ftp server
  ftp://svr-ftp.eng.cam.ac.uk/comp.speech/coding/celp_3.2a.tar.Z
  ftp://svr-ftp.eng.cam.ac.uk/comp.speech/coding/celp_3.2a.tar.gz
  LPC-10 Fortran source code is also available:
  ftp://ftp.super.org/pub/speech/lpc10-1.0.tar.gz
  Here is a modified LPC-10 release that includes ANSI C source:
  http://www.arl.wustl.edu/~jaf/lpc/
• Documentation: The following articles describe the Federal-Standard-1016 4.8-kbps CELP coder:
  • Campbell, Joseph P. Jr., Thomas E. Tremain and Vanoy C. Welch, "The Federal Standard 1016 4800 bps CELP Voice Coder," Digital Signal Processing, Academic Press, 1991, Vol. 1, No. 3, p. 145-155.
  • Campbell, Joseph P. Jr., Thomas E. Tremain and Vanoy C. Welch, "The DoD 4.8 kbps Standard (Proposed Federal Standard 1016)," in Advances in Speech Coding, ed. Atal, Cuperman and Gersho, Kluwer Academic Publishers, 1991, Chapter 12, p. 121-133.
  The U.S. DoD's Federal-Standard-1015/NATO-STANAG-4198 based 2400 bps linear prediction coder (LPC-10) was republished as a Federal Information Processing Standards Publication 137 (FIPS Pub 137). It is described in:
  • Thomas E. Tremain, "The Government Standard Linear Predictive Coding Algorithm: LPC-10," Speech Technology Magazine, April 1982, p. 40-49.
  There is also a section about FS-1015 in the book:
  • Panos E. Papamichalis, Practical Approaches to Speech Coding, Prentice-Hall, 1987.
  The voicing classifier used in the enhanced LPC-10 (LPC-10e) is described in:
  • Campbell, Joseph P., Jr. and T. E. Tremain, "Voiced/Unvoiced Classification of Speech with Applications to the U.S. Government LPC-10E Algorithm," Proceedings of the IEEE Intl. Conf. on Acoustics, Speech, and Signal Processing, 1986, p. 473-6.
• Vendors:
  Realtime DSP code for FS-1015 and FS-1016 is sold by:
  • John DellaMorte, DSP Software Engineering
    165 Middlesex Tpk, Suite 206, Bedford, MA 01730, USA
    Ph: 1-617-275-3733 Fax: 1-617-275-4323
    Email: dspse.bedford@channel1.com
  DSP Software Engineering's FS-1016 code can run on a DSP Research's Tiger 30 (a PC board with a TMS320C3x and analog interface suited to development work).
  • DSP Research
    1095 E. Duane Ave, Sunnyvale, CA 94086, USA
    Ph: (408)773-1042 Fax: (408)736-3451

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