Voicebox: Speech Processing Toolbox for MATLAB
Function names have been prefixed "v_" to avoid name conflicts; the
unprefixed aliases will be removed in a future version. Use the function
v_voicebox_update to update old code which, by default, updates all .m files
in the current folder.
Audio File Input/Output
v_readwav - Read a WAV file
v_writewav - Write a WAV file
v_readhtk - Read HTK waveform files
v_writehtk - Write HTK waveform files
v_readsfs - Read SFS files
v_readsph - Read SPHERE/TIMIT waveform files
v_readaif - Read AIFF Audio Interchange file format file
v_readcnx - Raed BT Connex database files
v_readau - Read AU files (from SUN)
v_readflac - Read FLAC files
wavread - Emulation of legacy MATLAB function to read a WAV file
wavwrite - Emulation of legacy MATLAB function to write a WAV file
Frequency Scales
v_frq2bark - Convert Hz to the Bark frequency scale
v_frq2cent - Convert Hertz to cents scale
v_frq2erb - Convert Hertz to erb rate scale
v_frq2mel - Convert Hertz to mel scale
v_frq2midi - Convert Hertz to midi scale of semitones
v_bark2frq - Convert the Bark frequency scale to Hz
v_cent2frq - Convert cents scale to Hertz
v_erb2frq - Convert erb rate scale to Hertz
v_mel2frq - Convert mel scale to Hertz
v_midi2frq - Convert midi scale of semitones to Hertz
Fourier/DCT/Hartley Transforms
v_rfft - FFT of real data
v_irfft - Inverse of FFT of real data
v_rsfft - FFT of real symmetric data
v_rdct - DCT of real data
v_irdct - Inverse of DCT of real data
v_rhartley - Hartley transform of real data
v_zoomfft - calculate the fft over a portion of the spectrum with any resolution
v_sphrharm - calculate forward and inverse shperical harmonic transformations
Random Number Generation
v_randvec - Generate random vectors
v_randiscr - Generate discrete random values with prescribed probabilities
v_stdspectrum - Generate noise samples from standard audio and speech spectra
v_randfilt - Generate filtered random noise without transients
v_rnsubset - Select a random subset
Probability Distributions
v_berk2prob - Convert Berksons to probability
v_gaussmix - Fit a gaussian mixture model to data values
v_gaussmixb - Estimate Bhattacharya divergence between two GMMs
v_gaussmixd - Calculate marginal and conditional density distributions and perform inference
v_gaussmixk - Estimate Kuleck-Leibler divergence between two GMMs
v_gaussmixg - Calculate global mean, covariance and mode of a Gaussian mixture
v_gaussmixm - Estimate mean and variance of GMM vector magnitude
v_gaussmixp - Calculates and plots full and marginal probability density from a GMM
v_gaussmixt - multiplies two GMMs together
v_gausprod - Calculate the product of multiple gaussians
v_gmmlpdf - OBSOLETE - use v_gaussmixp instead
v_histndim - N-dimensional histogram (+ plot 2-D histogram)
v_lognmpdf - Prob density function of a lognormal distribution
v_maxgauss - Calculate the mean and variance of max(x) where x is a gaussian vector
v_normcdflog - Calculate the log of the Normal cdf without underflow
v_pdfmoments - Convert between central moments, raw moments and cumulants
v_prob2berk - Convert probability to Berksons
v_usasi - Generate USASI noise (obsolete: use v_stdspectrum instead)
v_chimv - Approximate mean and variance of non-central chi distribution
v_vonmisespdf - Calculate the pdf of the Von Mises (circular normal) distribution
Vector Distances
v_disteusq - Calculate euclidean/mahanalobis distances between two sets of vectors
v_distchar - COSH spectral distance between AR coefficient sets
v_distitar - Itakura spectral distance between AR coefficient sets
v_distisar - Itakura-Saito spectral distance between AR coefficient sets
v_distchpf - COSH spectral distance between power spectra
v_distitpf - Itakura spectral distance between power spectra
v_distispf - Itakura-Saito spectral distance between power spectra
Speech Analysis
v_activlev - Calculate the active level of speech (ITU-T P.56)
v_activlevg - Calculate the active level of speech robustly to added noise
v_dypsa - Estimate glottal closure instants from a speech waveform
v_earnoise - Add noise to an audio signal to represent the listener's hearing threshold
v_enframe - Divide a speech signal into frames for frame-based processing
v_correlogram - calculate a 3-D v_correlogram
v_ewgrpdel - Energy-weighted group delay waveform
v_fram2wav - Interpolate frame-based values to a waveform
v_filtbankm - Transformation matrix for a linear/mel/erb/bark-spaced v_filterbank from dft output
v_fxpefac - PEFAC pitch tracker
v_fxrapt - RAPT pitch tracker
v_gammabank - Calculate a bank of IIR gammatone filters
v_importsii - Calculate the SII importance function (ANSI S3.5-1997)
v_istftw - Inverse Short-time Fourier Transform
v_modspect - Calculate the modulation specrogram
v_mos2pesq - Convert MOS values to equivalent PESQ scores
v_overlapadd - Reconstitute an output waveform after frame-based processing
v_pesq2mos - Convert PESQ scores to equivalent MOS values
v_phon2sone - Convert signal levels from phons to sones
v_psycdigit - Experimental estimation of monotonic/unimodal psychometric function using TIDIGITS
v_psycest - Experimental estimation of monotonic psychometric function
v_psycestu - Experimental estimation of unimodal psychometric function
v_psychofunc - Psychometric functions
v_sigma - Identify glottal closure and opening intstants from Lx or EGG waveform
v_snrseg - Segmental SNR and Global SNR calculation
v_sone2phon - Convert signal levels from sones to phons
v_soundspeed - Returns the speed of sound in air as a function of temperature
v_spgrambw - Spectrogram with many options
v_stftw - Short-time Fourier Transform
v_stoi2prob - Convert STOI intelligibility measure to probability of correct recognition
v_txalign - Align two sets of time markers
v_vadsohn - Voice activity detector
v_ppmvu - Calculate the PPM, VU or EBU levels of a signal
LPC Analysis of Speech
v_ccwarpf - warp complex cepstrum coefficients
v_lpcauto - LPC analysis: autocorrelation method
v_lpcbwexp - Bandwidth expansion of LPC filter
v_lpccovar - LPC analysis: covariance method
v_lpcconv - Arbitrary conversion between LPC representations
v_lpcifilt - inverse filter a speech signal
v_lpcrand - create random stable filters
v_rootstab - determines the number of polynomial roots outside, inside and on the unit circle
v_lpcrr2am - Matrix with all LPC filters up to order p
v_lpcstable - check for stability and force stable filters
v_lpc--2-- - Convert between alternative LPC representation
Speech Synthesis
v_sapisynth - Text-to-speech synthesis of a string or matrix
v_glotros - Rosenberg model of glottal waveform
v_glotlf - Liljencrants-Fant model of glottal waveform
Speech Enhancement
v_estnoiseg - Estimate the noise spectrum from noisy speech using MMSE method
v_estnoisem - Estimate the noise spectrum from noisy speech using minimum statistics
v_specsub - Speech enhancement using spectral subtraction
v_ssubmmse - Speech enhancement using MMSE estimate of spectral amplitude or log amplitude
v_ssubmmsev - Speech enhancement using MMSE estimate and VAD-based noise estimation
v_specsubm - (obsolete algorithm) Spectral subtraction
v_spendred - Speech Enhancement and Dereverberation (Doire's algorithm)
Speech Coding
v_lin2pcmu - Convert linear PCM to mu-law PCM
v_pcma2lin - Convert A-law PCM to linear PCM
v_pcmu2lin - Convert mu-law PCM to linear PCM
v_lin2pcma - Convert linear PCM to A-law PCM
v_kmeanlbg - Vector quantisation: LBG algorithm
v_kmeanhar - Vector quantization: K-harmonic means
v_potsband - Create telephone bandwidth filter
v_kmeans - Vector quantisation: k-means algorithm
Speech Recognition
v_ldatrace - constrained Linear Discriminant Analysis to maximize trace(W\B)
v_melbankm - Mel v_filterbank transformation matrix
v_melcepst - Mel cepstrum frontend for recogniser
v_cep2pow - Convert mel cepstram means & variances to power domain
v_pow2cep - Convert power domain means & variances to mel cepstrum
Signal Processing
v_addnoise - Add noise to a signal at a chosen SNR
v_convfft - 1-dimensional convolution/corrolation using FFT
v_ditherq - Add dither and quantize a signal
v_filterbank - Apply a bank of IIR filters to a signal
v_findpeaks - Find peaks in a signal or spectrum
v_maxfilt - Running maximum filter
v_meansqtf - Output power of a filter with white noise input
v_momfilt - Generate running moments
v_resample - Resamples a signal: identical to MATLAB resample but removes filter transients
v_schmitt - Pass a signal through a v_schmitt trigger
v_sigalign - Align a clean refeence with a noisy signal
v_teager - Calculate the Teager energy waveform
v_windinfo - Calculate window properties and figures of merit
v_windows - Window function generation
v_zerocros - Find interpolated zero crossings
Information Theory
v_huffman - Generate Huffman code
v_entropy - Calculate v_entropy and conditional v_entropy
Computer Vision
v_imagehomog - Apply a homography transformation to an image with bilinear interpolation
v_polygonarea - Calculate the area of a polygon
v_polygonwind - Test if points are inside or outside a polygon
v_polygonxline - Find where a line crosses a polygon
v_qrabs - Absolute value of a real quaternion
v_qrdivide - divide two real quaternions (or invert one)
v_qrdotdiv - elmentwise division of two real quaternion arrays
v_qrdotmult - elmentwise multiplication of two real quaternion arrays
v_qrmult - multiply two real quaternion arrays
v_qrpermute - permute the indices of a quaternion array
v_rectifyhomog - Apply rectifing homographies to a set of cameras to make their optical axes parallel
v_rot--2-- - Convert between different representations of rotations
v_roteucode - decode a string specifying a sequence of Euler angle rotations
v_rotqrmean - Find the average of several v_rotation quaternions
v_rotqrvec - Apply a quaternion rotation to an array of 3D vectors
v_sphrharm - forward and inverse spherical harmonic transform using uniform, Gaussian
or arbitrary inclination (elevation) grids and a uniform azimuth grid.
v_upolyhedron - Calculate the vertex coordinates and other characteristics of a uniform polyhedron
Printing and Display functions
v_axisenlarge - Selectively enlarge figure axis for clarity
v_cblabel - Add a label onto the colorbar
v_figbolden - Make a figure bold and adjust colours for printing clearly
v_fig2emf - Make a figure bold and save as a windows metafile
v_fig2pdf - Make a figure bold and save as pdf, eps or ps
v_frac2bin - Convert numbers to fixed-point binary strings
v_lambda2rgb - convert wavelength to XYZ or RGB colour triplets
v_sprintsi - Print a value with an SI multiplier
v_sprintcpx - Print a complex number with real and imaginary parts
v_texthvc - write text on a plot with specified alignment and colour
v_tilefigs - Arrange all figures on the screen
v_colormap - Set and plot colormap information
v_xtickint - Restrict x-axis tick marks to integer values
v_xticksi - Label x-axis tick marks using SI multipliers
v_ytickint - Restrict y-axis tick marks to integer values
v_yticksi - Label y-axis tick marks using SI multipliers
v_xyzticksi - Helper function for v_xticksi and v_yticksi
Voicebox Parameters and System Interface
v_hostipinfo - Get information about the computer name and internet connections
v_regexfiles - Recursively find files that match a regular expression pattern
v_unixwhich - Search the WINDOWS system path for an executable program (like UNIX which)
v_voicebox - Global installation-dependent parameters
v_winenvar - Obtain WINDOWS environment variables
v_voicebox_update - Update matlab files in the current folder to include the v_ prefix where needed
Utility Functions
v_atan2sc - arctangent function that returns the sin and cos of the angle
v_besratinv0 - Inverse function of the Modified Bessel Ratio I1(k)/I0(k)
v_besselratio - calculate the Bessel function ratio: besseli(v+1,x)./besseli(v,x)
v_besselratioi - calculate the inverse of v_besselratio [only for v=0]
v_bitsprec - Rounds values to a precision of n bits
v_choosenk - All choices of k elements out of 1:n without replacement
v_choosrnk - All choices of k elements out of 1:n with replacement
v_dlyapsq - Solve the discrete lyapunov equation
v_dualdiag - Simultaneously diagonalise two hermitian matrices
v_finishat - Estimate the finishing time of a long loop
v_fopenmkd - Like FOPEN() but creates any missing directories/folders
v_gammalns - Calculates log(gamma(x)) for signed real-valued x
v_horizdiff - Estimate the horizontal difference between two functions of x
v_hypergeom1f1 - Confluent Hypergeometric function or Kummer's M function
v_interval - Classify data into a set of contiguous intervals
v_logsum - Calculates log(sum(exp(x))) without overflow/underflow
v_minspane - calculate the minimum (or shortest) spanning tree
v_mintrace - find a row permutation to minimize the trace of a matrix
v_modsym - Symmetric modulus function: v_modsym(x,y,r) lies in range [r-y/2,r+y/2]
v_m2htmlpwd - Create HTML documentation of matlab routines in the current directory
v_nearnonz - Replace each zero element with the nearest non-zero element
v_paramsetch - Set a parameter structure and do valididty checks
v_permutes - All n! permutations of 1:n
v_quadpeak - Find quadratically-interpolated peak in a 2D array
v_rangelim - Limit matrix elements to a prescribed range
v_rotation - Generate v_rotation matrices
v_skew3d - Generate 3x3 skew symmetric matrices
v_sort - Same as normal sort() but with an additional output that is an inverse index
v_zerotrim - Remove empty trailing rows and columns
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