	    +----------------------------------------------------+
	    |  Announcing XWPL, the X Wavelet Packet Laboratory  |
	    +----------------------------------------------------+

I am pleased to announce release 1.3 of XWPL, the X Window System Wavelet
Packet Laboratory.  It is available in binary form by anonymous ftp from
pascal.math.yale.edu (128.36.23.1), in the directory /pub/software/xwpl.
Binaries are available for the following platforms:

	- Sun Sparcstations running SunOS 4.1 but not Solaris 2.x
	- Silicon Graphics machines running IRIX 4.0.1
	- DEC Alpha AXP running OSF/1 1.2 or higher
	- i386/i486 PC compatible with Linux 0.99
	- HP 9000/700 series running HP-UX 9.0

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1	What is XWPL ?

XWPL is an X based tool to examine one-dimensional real-valued signals using
wavelets and wavelet packets.  It has been designed to be as easy to use as
possible for beginners.  It is intended more as an educational and exploratory
tool than as a numerical analysis program, even though it uses fast, optimized
wavelet and wavelet packet transforms.

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2	What are Wavelets and Wavelet Packets ?

In short, wavelets are a way to analyze a signal using base functions which
are localized both in time (as diracs, but unlike sine waves), and in
frequency (as sine waves, but unlike diracs).  They can be used for efficient
numerical algorithms and many DSP or compression applications.

The mathematical theory behind wavelets (and other related transforms) is
given in the appendix of the XWPL reference manual.

Other sources of information on wavelets are:
- a mailing list, "Wavelet Digest"
  Subscriptions for Wavelet Digest: 
    E-mail to wavelet@math.scarolina.edu with "subscribe" as subject.
    To unsubscribe, e-mail with "unsubscribe" followed by your e-mail
    address as subject.  To change address, unsubscribe and resubscribe.
- the Wavelet gopher site bigcheese.math.scarolina.edu
- the ftp servers pascal.math.yale.edu and maxwell.math.scarolina.edu

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3	How to get it

XWPL is available in binary form only from the ftp server pascal.math.yale.edu
(IP address: 128.36.23.1), in the directory /pub/software/xwpl.  There is one
directory for each supported machine containing compressed executables, the
man page.  There is also a sample data directory containing interesting
signals.  When you transfer the files, do not forget to set binary mode and to
set the executable bit after uncompressing the program with "chmod +x xwpl".

All bug-reports, suggestions, clarifications, flames, etc...  should be
directed to the author, Fazal Majid (majid@math.yale.edu).

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4	How to install it

Once you have the appropriate package for your machine architecture and
operating system, go into a convenient directory, and type the following:

	zcat xwpl-1.2-(machine).tar.Z | tar xvf -

The archive will be ucompressed and unpacked into a directory "xwpl". You can
now delete the original .tar.Z file as it no longer is needed and takes
unnecessary disk space.

The main files in the "xwpl" directory are:

	README		this file
	CHANGES		a version history and change log
	xwpl		the executable
	xwpl.man	an Unix-style man page for xwpl (short)
	manual.ps	the reference manual in PostScript form
	data/		a directory containing interesting samples
	data/List.txt	a description of those files

To view the man page, type the following:

	nroff -man xwpl.man | more

it can also be installed as /usr/man/man1/xwpl.1 (or whatever the man path is
on your system), for the man page to be accessible system-wide using the "man"
command. If you have ptroff, ditroff+psroff or groff, you can also make
typeset versions of this man page.

The PostScript manual is 47 pages long, and can be printed on a PostScript
printer such as an Apple Laserwriter, HP Laserjet 4M/4ML or III with
PostScript option, QMS, DEC LPS, etc... Your printer might have problems with
large figures included in the manual. Alternatively, you might view it using
one of the many postscript previewers available, such as ghostscript/ghostview
(freely available by ftp from prep.ai.mit.edu), psview/xpsview, pageview (Sun
systems), dxvdoc (DEC systems), etc...

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5	No warranty

XWPL is put on anonymous ftp as a service to the math/DSP/internet
communities.  There is no warranty for this software.  If you are not
satisfied with these terms, do not use it!

THIS SOFTWARE IS LICENSED FREE OF CHARGE FOR NONCOMMERCIAL, RESEARCH, AND
EDUCATIONAL PURPOSES.  PLEASE ADDRESS REQUESTS FOR COMMERCIAL AND ADDITIONAL
RIGHTS TO PROFESSOR R.R.COIFMAN, DEPARTMENT OF MATHEMATICS, YALE UNIVERSITY,
10 HILLHOUSE AVENUE, NEW HAVEN CONNECTICUT 06520.  YOU MAY FREELY REDISTRIBUTE
ALL OR PART OF THIS SOFTWARE PACKAGE AS LONG AS YOU OBSERVE THE FOLLOWING
CONDITIONS:

	1.  YOU CHARGE NO FEE BEYOND REASONABLE DUPLICATION COSTS.
	2.  YOU INCLUDE THIS FILE IN ALL DIRECTORIES OF THE DISTRIBUTION.

			   NO WARRANTY

BECAUSE XWPL IS LICENSED FREE OF CHARGE, WE PROVIDE ABSOLUTELY NO WARRANTY, TO
THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN
WRITING, YALE UNIVERSITY, F. MAJID, R.R. COIFMAN, Y. MEYER, M.V. WICKERHAUSER,
AND/OR OTHER PARTIES PROVIDE XWPL "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER
EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS TO
THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE XWPL
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW WILL YALE UNIVERSITY, F. MAJID,
R.R. COIFMAN, Y. MEYER, M.V. WICKERHAUSER, AND/OR ANY OTHER PARTY WHO MAY
MODIFY AND REDISTRIBUTE XWPL AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY LOST PROFITS, LOST MONIES, OR OTHER SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM,
EVEN IF YOU HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR FOR ANY
CLAIM BY ANY OTHER PARTY.  THESE LOSSES INCLUDE BUT ARE NOT LIMITED TO: LOSS
OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY THIRD PARTIES
OR A FAILURE OF THE PROGRAM TO OPERATE WITH PROGRAMS NOT DISTRIBUTED BY YALE
UNIVERSITY OR THE AUTHORS OF THIS SOFTWARE.
