?? voicebox speech processing toolbox for matlab.htm
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<H1>VOICEBOX: Speech Processing <B
style="BACKGROUND-COLOR: #a0ffff; COLOR: black">Toolbox</B> for <B
style="BACKGROUND-COLOR: #ffff66; COLOR: black">MATLAB</B></H1>
<H2>Introduction</H2>
<P>VOICEBOX is a speech processing <B
style="BACKGROUND-COLOR: #a0ffff; COLOR: black">toolbox</B> consists of <B
style="BACKGROUND-COLOR: #ffff66; COLOR: black">MATLAB</B> routines that are
maintained by and mostly written by <A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/dmb.html">Mike Brookes</A>, <A
href="http://www.ee.ic.ac.uk/">Department of Electrical & Electronic
Engineering</A>, <A href="http://www.ic.ac.uk/">Imperial College</A>, Exhibition
Road, London SW7 2BT, UK. Several of the routines require <B
style="BACKGROUND-COLOR: #ffff66; COLOR: black">MATLAB</B> V5.</P>
<P>The routines are available as a <A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.tar.Z">compressed
tar file</A> or as a <A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.zip">zip archive</A>
and are made available under the terms of the <A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/copying.txt">GNU Public
License</A>. </P>
<P>Please send any comments, suggestions, bug reports etc to <A
href="mailto:mike.brookes@ic.ac.uk">mike.brookes@ic.ac.uk</A>. </P>
<HR>
<H2>Contents</H2>
<HR>
<DL>
<DT><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html#file">Audio
File Input/Output </A>
<DD>Read and write WAV and other speech file formats
<DT><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html#frequency">Frequency
Scales </A>
<DD>Convert between Hz, Mel, Erb and MIDI frequency scales
<DT><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html#fourier">Fourier/DCT/Hartley
Transforms</A>
<DD>Various related transforms
<DT><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html#random">Random
Number Generation</A>
<DD>Generate random vectors and noise signals
<DT><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html#distance">Vector
Distances</A>
<DD>Calculate distances between vector lists
<DT><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html#analysis">Speech
Analysis</A>
<DD>Active level estimation, Spectrograms
<DT><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html#lpc">LPC
Analysis of Speech</A>
<DD>Linear Predictive Coding routines
<DT><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html#synthesis">Speech
Synthesis</A>
<DD>Glottal waveform models
<DT><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html#enhance">Speech
Enhancement</A>
<DD>Spectral noise subtraction
<DT><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html#coding">Speech
Coding</A>
<DD>PCM coding, Vector quantisation
<DT><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html#recog">Speech
Recognition</A>
<DD>Front-end processing for recognition
<DT><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/voicebox.html#utility">Utility
Functions</A>
<DD>Miscellaneous utility functions </DD></DL>
<HR>
<HR>
<H2><A name=file>Audio File Input/Output</A></H2>
<BLOCKQUOTE>
<P>Routines are available to read and, in some cases write, a variety of file
formats:</P>
<TABLE border=0 cellPadding=2 width="100%">
<TBODY>
<TR>
<TD width=50><B>Read</B></TD>
<TD width=50><B>Write</B></TD>
<TD width=30><B>Suffix</B></TD>
<TD> </TD></TR>
<TR>
<TD width=50><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/readwav.txt">readwav</A></TD>
<TD width=50><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/writewav.txt">writewav</A></TD>
<TD width=30>.wav</TD>
<TD>These routines allow an arbitrary number of channels and can deal
with linear PCM (any precision up to 32 bits), A-law PCM and Mu-law PCM.
Large files can be read and written in small chunks.</TD></TR>
<TR>
<TD width=50><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/readhtk.txt">readhtk</A></TD>
<TD width=50><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/writehtk.txt">writehtk</A></TD>
<TD width=30>.htk</TD>
<TD>Read and write waveform files used by Entropic's Hidden Markov
Toolkit.</TD></TR>
<TR>
<TD width=50><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/readsfs.txt">readsfs</A></TD>
<TD width=50> </TD>
<TD width=30>.sfs</TD>
<TD>Speech Filing system files from Mark Huckvale at UCL.</TD></TR>
<TR>
<TD width=50><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/readsph.txt">readsph</A></TD>
<TD width=50> </TD>
<TD width=30>.sph</TD>
<TD>NIST Sphere format files (including TIMIT).</TD></TR>
<TR>
<TD width=50><A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/readaif.txt">readaif</A></TD>
<TD width=50> </TD>
<TD width=30>.aif</TD>
<TD>Audio Interchange File Format used by Mac
users.</TD></TR></TBODY></TABLE></BLOCKQUOTE>
<HR>
<H2><A name=frequency>Frequency Scale Conversion</A></H2>
<UL>
<LI>The <I>mel scale</I> is based on the human perception of sinewave pitch.
The routines <A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/mel2frq.txt">mel2frq</A>
and <A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/frq2mel.txt">frq2mel</A>
convert between this scale and frequency in Hz.
<LI>The <I>erb</I> scale is based on the equivalent rectangular bandwidths of
the human ear. The routines <A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/erb2frq.txt">erb2frq</A>
and <A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/frq2erb.txt">frq2erb</A>
convert between the erb rate scale and frequency in Hz.
<LI>The <I>midi standard</I> specifies a numbering of <I>semitones</I> with
middle C being 60. The routines <A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/frq2midi.txt">frq2midi</A>
and <A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/midi2frq.txt">midi2frq</A>
convert between this musical frequency scale and Hz. <A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/frq2midi.txt">frq2midi</A>
will in addition output note names in a character format. <A
href="http://www.ee.ic.ac.uk/hp/staff/dmb/voicebox/txt/midi2frq.txt">midi2frq</A>
can use the normal equal tempered scale or else the pythagorean scale of just
intonation. </LI></UL>
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