File Release Notes and Changelog
Release Name: v3.9
Notes: Happy user support page : http://sourceforge.net/donate/index.php?group_id=40316 Copyright 2001 Matt Flax <flatmax at ieee d0t org> 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 (in the ideal implementation). It is now possible to get very high quality audio using the FFT based implementation. As of Version 3.0, this implementation of WSOLA is now approximatly six times faster then real time (800MHz CPU with coprocessor). Operational time on a 24 second stereo sample with a factor of 1.0 : Linux takes 6 seconds. It is completely stable. Microsoft takes approximatly the same ammout of time. (Using Cygwin GNU*NIX translation) Requirements : * This program can read alot of file types because of the wrapper to libsndfile : http://sourceforge.net/projects/mffmlibsndfilew/ * This program requires an installed version of MFFM multimedia time code handling classes. Try : http://mffmtimecode.sourceforge.net/ For fast operation (v 3.* only), you will also require MFFM FFTw C++ wrapper. Try: http://mffmfftwrapper.sourceforge.net/ Audio files are read and written using LibSndFile v1 : http://www.zip.com.au/~erikd/libsndfile/ Finally you require a C++ compiler, try : http://gcc.gnu.org/install/binaries.html http://www.cygwin.com (Microsoft users) MS Windows BINARY users wiil require the file 'cygwin1.dll'. If it is not shipped with this zip package then please try to find it at Cygwin: http://www.cygwin.com My other projects : http://sourceforge.net/search/?type_of_search=soft&words=mffm This project's 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 WSOLA like so : WSOLA 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.
Changes: Version 3.9 23/11/04 * This version is more stable and should now run well under all OSs. * Removed the 'processLastFrame' call which was breaking the Microsoft versions Version 3.8 15/11/04 * First release of new theory - for testing - high quality FFT based implementation. This implements the file 'hybridDomainProcessing.pdf' also released with this project Version 3.7 12/11/04 * worked out the theory for implementing FT based WSOLA correctly. This should replace the current method in V2 and render the quality as the same for V1. Read the TODO and hybridDomainProcessing.pdf for more information. Version 3.6 11/11/04 * Tested with other MFFM projects on sourceforge ... compiles correctly. * Changed README file * Removed libsndfile.H in favour of MFFM_libsndfilew package http://sourceforge.net/search/?type_of_search=soft&words=mffm Version 3.5 05/04/04 * Fixed WSOLA.v2 to work with mffmfftwrapper (fftw3) v1.4 Version 3.4 08/08/03 * Fixed libSndFileWrapper.H Version 3.3 28/02/03 * Switched to using libsndfile version 1.x.x from 0.x.x * Upon noting that WSOLA v1 gave better compression quality then WSOLA v2, both v1 and v2 have seperate executables. Version 3.2 08/02/03 * Fixed maximum similarity scan to check for only relevant channel matches. This was an unknown bug. * Removed the v2 similarity check mechanism. Thesde remain resident in (WSOLA.v2.H) for those who are interested. Version 3.1 24/01/03 * Documentation included listing implementation change from v2.x to v3.x Version 3.0 * First version to use FFTing for similarity checks (must define USE_FFT to use) * WSOLA now runs at 4*realtime (4 times faster then realtime) Version 2.8 * See Version 3.4 Version 2.7 * Included cygwin1.dll in the windows zip file. Version 2.6 * Fixed sample rate problems by making it a variable * Recompiled for win32 using cygwin ... greatly improves performance on win32 Version 2.5 * Fixed libSndFileWrapper.H to work with multi channels * Added multi channel functionality. * Changelog Started
