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13. Current Locations of Related Resources

  1. Current Locations of Related Resources

Note: Several sections below refer to the ITU-T Software Tool Library (STL). It is available from the ITU Sales Service, Place des Nations, CH-1211 Geneve 20, Switzerland (also check http://www.itu.int). The ITU-T STL is covered by a license defined in ITU-T Recommendation G.191, "Software tools for speech and audio coding standardization".

DVI4

An archived copy of the document IMA Recommended Practices for Enhancing Digital Audio Compatibility in Multimedia Systems (version 3.0), which describes the IMA ADPCM algorithm, is available at:

  http://www.cs.columbia.edu/~hgs/audio/dvi/

An implementation is available from Jack Jansen at

  ftp://ftp.cwi.nl/local/pub/audio/adpcm.shar

G722

An implementation of the G.722 algorithm is available as part of the ITU-T STL, described above.

G723

The reference C code implementation defining the G.723.1 algorithm and its Annexes A, B, and C are available as an integral part of Recommendation G.723.1 from the ITU Sales Service, address listed above. Both the algorithm and C code are covered by a specific license. The ITU-T Secretariat should be contacted to obtain such licensing information.

G726

G726 is specified in the ITU-T Recommendation G.726, "40, 32, 24, and 16 kb/s Adaptive Differential Pulse Code Modulation (ADPCM)". An implementation of the G.726 algorithm is available as part of the ITU-T STL, described above.

G729

The reference C code implementation defining the G.729 algorithm and its Annexes A through I are available as an integral part of Recommendation G.729 from the ITU Sales Service, listed above. Annex I contains the integrated C source code for all G.729 operating modes. The G.729 algorithm and associated C code are covered by a specific license. The contact information for obtaining the license is available from the ITU-T Secretariat.

GSM

A reference implementation was written by Carsten Bormann and Jutta Degener (then at TU Berlin, Germany). It is available at

  http://www.dmn.tzi.org/software/gsm/

Although the RPE-LTP algorithm is not an ITU-T standard, there is a C code implementation of the RPE-LTP algorithm available as part of the ITU-T STL. The STL implementation is an adaptation of the TU Berlin version.

LPC

An implementation is available at

  ftp://parcftp.xerox.com/pub/net-research/lpc.tar.Z

PCMU, PCMA

An implementation of these algorithms is available as part of the ITU-T STL, described above.

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