Voicebox: Speech Processing Toolbox for MATLAB
Audio File Input/Output
readwav - Read a WAV file
writewav - Write a WAV file
readhtk - Read HTK waveform files
writehtk - Write HTK waveform files
readsfs - Read SFS files
readsph - Read SPHERE/TIMIT waveform files
readaif - Read AIFF Audio Interchange file format file
readcnx - Raed BT Connex database files
readau - Read AU files (from SUN)
readflac - Read FLAC files
Frequency Scales
frq2mel - Convert Hertz to mel scale
mel2frq - Convert mel scale to Hertz
frq2erb - Convert Hertz to erb rate scale
erb2frq - Convert erb rate scale to Hertz
frq2bark - Convert Hz to the Bark frequency scale
bark2frq - Convert the Bark frequency scale to Hz
frq2midi - Convert Hertz to midi scale of semitones
midi2frq - Convert midi scale of semitones to Hertz
Fourier/DCT/Hartley Transforms
rfft - FFT of real data
irfft - Inverse of FFT of real data
rsfft - FFT of real symmetric data
rdct - DCT of real data
irdct - Inverse of DCT of real data
rhartley - Hartley transform of real data
zoomfft - calculate the fft over a portion of the spectrum with any resolution
sphrharm - calculate forward and inverse shperical harmonic transformations
Probability Distributions
randvec - Generate random vectors
randiscr - Generate discrete random values with prescribed probabilities
rnsubset - Select a random subset
randfilt - Generate filtered random noise without transients
stdspectrum - Generate standard audio and speech spectra
gausprod - Calculate the product of multiple gaussians
maxgauss - Calculate the mean and variance of max(x) where x is a gaussian vector
gaussmix - Fit a gaussian mixture model to data values
gaussmixp - Calculates full and marginal probability density from a Gaussian mixture
gaussmixd - Calculate marginal and conditional density distributions and perform inference
gmmlpdf - Prob density function of a multivariate Gaussian mixture
lognmpdf - Prob density function of a lognormal distribution
histndim - N-dimensional histogram (+ plot 2-D histogram)
usasi - Generate USASI noise (obsolete: use stdspectrum instead)
Vector Distances
disteusq - Calculate euclidean/mahanalobis distances between two sets of vectors
distchar - COSH spectral distance between AR coefficient sets
distitar - Itakura spectral distance between AR coefficient sets
distisar - Itakura-Saito spectral distance between AR coefficient sets
distchpf - COSH spectral distance between power spectra
distitpf - Itakura spectral distance between power spectra
distispf - Itakura-Saito spectral distance between power spectra
Speech Analysis
activlev - Calculate the active level of speech (ITU-T P.56)
dypsa - Estimate glottal closure instants from a speech waveform
enframe - Divide a speech signal into frames for frame-based processing
correlogram - calculate a 3-D correlogram
ewgrpdel - Energy-weighted group delay waveform
fram2wav - Interpolate frame-based values to a waveform
filtbankm - Determine matrix for a linear/mel/erb/bark-spaced filterbank
fxpefac - PEFAC pitch tracker
fxrapt - RAPT pitch tracker
gammabank - Calculate a bank of IIR gammatone filters
importsii - Calculate the SII importance function (ANSI S3.5-1997)
modspect - Caluclate the modulation specrogram
overlapadd - Reconstitute an output waveform after frame-based processing
psycdigit - Experimental estimation of monotonic/unimodal psychometric function using TIDIGITS
psycest - Experimental estimation of monotonic psychometric function
psycestu - Experimental estimation of unimodal psychometric function
psychofunc - Psychometric functions
sigma - Identify glottal closure and opening intstants from Lx or EGG waveform
snrseg - Segmental SNR and Global SNR calculation
soundspeed - Returns the speed of sound in air as a function of temperature
spgrambw - Spectrogram with many options
txalign - Align two sets of time markers
vadsohn - Voice activity detector
LPC Analysis of Speech
lpcauto - LPC analysis: autocorrelation method
lpccovar - LPC analysis: covariance method
lpc--2-- - Convert between alternative LPC representation
lpcrr2am - Matrix with all LPC filters up to order p
lpcconv - Arbitrary conversion between LPC representations
lpcbwexp - Bandwidth expansion of LPC filter
ccwarpf - warp complex cepstrum coefficients
lpcifilt - inverse filter a speech signal
lpcrand - create random stable filters
Speech Synthesis
sapisynth - Text-to-speech synthesis of a string or matrix
glotros - Rosenberg model of glottal waveform
glotlf - Liljencrants-Fant model of glottal waveform
Speech Enhancement
estnoisem - Estimate the noise spectrum from noisy speech using minimum statistics
specsub - Speech enhancement using spectral subtraction
ssubmmse - Speech enhancement using MMSE estimate of spectral amplitude or log amplitude
specsubm - (obsolete algorithm) Spectral subtraction
Speech Coding
lin2pcmu - Convert linear PCM to mu-law PCM
pcma2lin - Convert A-law PCM to linear PCM
pcmu2lin - Convert mu-law PCM to linear PCM
lin2pcma - Convert linear PCM to A-law PCM
kmeans - Vector quantisation: k-means algorithm
kmeanlbg - Vector quantisation: LBG algorithm
kmeanhar - Vector quantization: K-harmonic means
potsband - Create telephone bandwidth filter
Speech Recognition
melbankm - Mel filterbank transformation matrix
melcepst - Mel cepstrum frontend for recogniser
cep2pow - Convert mel cepstram means & variances to power domain
pow2cep - Convert power domain means & variances to mel cepstrum
ldatrace - constrained Linear Discriminant Analysis to maximize trace(W\B)
Signal Processing
ditherq - Add dither and quantize a signal
findpeaks - Find peaks in a signal or spectrum
filterbank - Apply a bank of IIR filters to a signal
maxfilt - Running maximum filter
meansqtf - Output power of a filter with white noise input
momfilt - Generate running moments
schmitt - Pass a signal through a schmitt trigger
sigalign - Align a clean refeence with a noisy signal
teager - Calculate the Teager energy waveform
windinfo - Calculate window properties and figures of merit
windows - Window function generation
zerocros - Find interpolated zero crossings
Information Theory
huffman - Generate Huffman code
entropy - Calculate entropy and conditional entropy
Computer Vision
imagehomog - Apply a homography transformation to an image with bilinear interpolation
rot--2-- - Convert between different representations of rotations
qrabs - Absolute value of a real quaternion
qrmult - multiply two real quaternions
qrdivide - divide two real quaternions (or invert one)
polygonarea - Calculate the area of a polygon
polygonwind - Test if points are inside or outside a polygon
polygonxline - Find where a line crosses a polygon
sphrharm - forward and inverse spherical harmonic transform using uniform, Gaussian
or arbitrary inclination (elevation) grids and a uniform azimuth grid.
upolyhedron - Calculate the vertex coordinates and other characteristics of a uniform polyhedron
Printing and Display functions
xticksi - Label x-axis tick marks using SI multipliers
yticksi - Label y-axis tick marks using SI multipliers
xyzticksi - Helper function for xticksi and yticksi
figbolden - Make a figure bold for printing clearly
cblabel - Add a label onto the colorbar
sprintsi - Print a value with an SI multiplier
frac2bin - Convert numbers to fixed -point binary strings
Voicebox Parameters and System Interface
voicebox - Global installation-dependent parameters
unixwhich - Search the WINDOWS system path for an executable program (like UNIX which)
winenvar - Obtain WINDOWS environment variables
Utility Functions
atan2sc - arctangent function that returns the sin and cos of the angle
bitsprec - Rounds values to a precision of n bits
choosenk - All choices of k elements out of 1:n without replacement
choosrnk - All choices of k elements out of 1:n with replacement
dlyapsq - Solve the discrete lyapunov equation
dualdiag - Simultaneously diagonalise two hermitian matrices
finishat - Estimate the finishing time of a long loop
fopenmkd - like FOPEN() but creates any missing directories/folders
hostipinfo - Get information about the computer name and internet connections
logsum - Calculates log(sum(exp(x))) without overflow/underflow
m2htmlpwd - Create HTML documentation of matlab routines in the current directory
nearnonz - Replace each zero element with the nearest non-zero element
permutes - All n! permutations of 1:n
quadpeak - Find quadratically-interpolated peak in a 2D array
rotation - Generate rotation matrices
skew3d - Generate 3x3 skew symmetric matrices
zerotrim - Remove empty trailing rows and columns
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