Copyright 2001 Matt Flax <flatmax@>

This application stretches and compresses audio without altering the frequency
character of the audio. For reasonable factors, this application will scale
audio without altering signal levels or introducing artifacts.

Requirements :
This program requires an installed version of MFFM multimedia time code
handling classes. Try :
http://mffmtimecode.sourceforge.net/

Audio files are read and written using LibSndFile :
http://www.zip.com.au/~erikd/libsndfile/

Finally you require a C++ compiler, try :
http://gcc.gnu.org/install/binaries.html

Home Page :
http://mffmtimescale.sourceforge.net

MFFM Time Scale Modification for Audio is 2 things :
a] A compilable program WSOLATest.C which allow you to time stretch and compress
   mono audio files. Audio files are restricted to be mono 16 bit frame sized.
b] A set of 2 header files which are the implementation of [1].

For simple use ....
Type 'make' and compile the program WSOLATest

Run WSOLATest like so :
WSOLATest inputFile outputFile factor
factor = 0.5 for halving the duration of an audio file
factor = 2.0 for doubling the duration of an audio file
factor = 1.0 for an identical file.

[1]"An overlap-add technique based on waveform similarity (WSOLA)
	for high quality time-scale modification of speech",
	Verhelst, W.; Roelands, M.
	Acoustics, Speech, and Signal Processing, 1993. ICASSP-93.,
	1993 IEEE International Conference on On page(s): 554 - 557 vol.2
	27-30 April 1993 Minneapolis, MN, USA 1993
	Volume: 2
	ISBN: 0-7803-0946-4
	Number of Pages: 5 vol. (652+735+606+559+681)
	References Cited: 4
	INSPEC Accession Number: 4771035
	Abstract:
	A concept of waveform similarity for tackling the problem of 
	time-scale modification of speech is proposed. It is worked 
	out in the context of short-time Fourier transform representations. 
	The resulting WSOLA (waveform-similarity-based synchronized 
	overlap-add) algorithm produces high-quality speech output, 
	is algorithmically and computationally efficient and robust, and 
	allows for online processing with arbitrary time-scaling factors 
	that may be specified in a time-varying fashion and can be chosen 
	over a wide continuous range of values.