NeVoT Acknowledgements

This work was supported in part by the the Defense Advanced Research Projects Agency under contract NAG2-578 while the author was at the University of Massachusetts. The support of advisors Jim Kurose and Don Towsley is acknowledged.

The DES library was written by Eric Young.

The audio library incorporating G.721 and G.723 audio compression was provided by Daniel Steinberg of Sun Microsystems. It may at some point be integrated into the regular Sun OS. The Intel/DVI ADPCM codec was slightly modified from sources by Jack Jansen (, CWI) and is copyrighted 1992 by Stichting Mathematisch Centrum, Amsterdam, The Netherlands (used by permission). The original sources are available by anonymous ftp from

The HP audio interface is based on suggestions by Jürgen Nickelsen, TU Berlin.

Ron Frederick ( Xerox PARC, Palo Alto, CA, contributed the LPC codec which is based on an implementation done by Ron Zuckerman ( of Motorola which was posted to the Usenet group comp.dsp on June 26, 1992. It is available separately by anonymous ftp from The GSM codec was developed by Jutta Degener (, Technische Universität Berlin, and Carsten Bormann (, University of Bremen.

The ST-II API and kernel support was developed by Charlie Lynn at BBN ( The ST-II API (st2_api.h) is copyrighted (c) 1991 by BBN Systems and Technologies, a division of Bolt Beranek and Newman, Inc. and used by permission. Charlie Lynn (BBN) was helpful with some of the fine points of the ST-II API used in earlier versions of NeVoT.

The Tcl interpreter and Tk X11 toolkit were developed by John Osterhout, University of California at Berkeley. The sources are copyright University of California and used by permission. The BLT extensions were written by George Howlett, AT&T Bell Laboratories. Tcl-DP was developed by Brian C. Smith, Department of Computer Science, Cornell University and Lawrence A. Rowe, Computer Science Division-EECS, University of California at Berkeley.

Advice on porting NeVoT to the Silicon Graphics platform and numerous bug fixes were provided by Andrew Cherenson (SGI). Michael Halle (MIT) figured out how to get Xview applications to display fonts at the design sizes. The VU meter is based on discussions with Gints Klimanis (Silicon Graphics).

The necessary changes to port NeVoT to the Solaris 2.0 operating system were suggested by Bob Gilligan (Sun Microsystems). Helpful debugging information was provided by Andrew Cherenson, Regina Rosales (BBN), Anders Klements (Swedish Institute of Computer Science), Barbary Denny (SRI), John Lockwood (AT&T and University of Illinois), and Alon Kleinman (Ubique).

The audio mixing (mix.c) and checksum code (checksum.c) was taken from the ISI voice terminal (VT), copyright June 1991 by the University of Southern California, by permission. The silence detector and the ST-II code are modified versions of the respective parts of VT.

The vat session and audio protocol were implemented based on descriptions provided by Van Jacobson. The statistics panel is structured similarly to that in vat.

The I/O flags interpreter (flags.c) is a modified version of software contributed to Berkeley by Chris Torek. Copyright (c) 1990 by the Regents of the University of California; used by permission.