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PURPOSE ^

Voicebox: Speech Processing Toolbox for MATLAB

SYNOPSIS ^

This is a script file.

DESCRIPTION ^

 Voicebox: Speech Processing Toolbox for MATLAB
 Some files have been prefixed "v_" to avoid name conflicts

 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
   frq2bark      - Convert Hz to the Bark frequency scale
   frq2cent      - Convert Hertz to cents scale
   frq2erb       - Convert Hertz to erb rate scale
   frq2mel       - Convert Hertz to mel scale
   frq2midi      - Convert Hertz to midi scale of semitones
   bark2frq      - Convert the Bark frequency scale to Hz
   cent2frq      - Convert cents scale to Hertz
   erb2frq       - Convert erb rate scale to Hertz
   mel2frq       - Convert mel scale to Hertz
   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
   berk2prob     - Convert Berksons to probability
   gaussmix      - Fit a gaussian mixture model to data values
   gaussmixd     - Calculate marginal and conditional density distributions and perform inference
   gaussmixk     - Estimate Kuleck-Leibler divergence between two GMMs
   gaussmixg     - Calculate global mean, covariance and mode of a Gaussian mixture
   gaussmixm     - Estimate mean and variance of GMM vector magnitude
   gaussmixp     - Calculates and plots full and marginal probability density from a GMM
   gaussmixt     - multiplies two GMMs together
   gausprod      - Calculate the product of multiple gaussians
   gmmlpdf       - OBSOLETE - use gaussmixp instead
   histndim      - N-dimensional histogram (+ plot 2-D histogram)
   lognmpdf      - Prob density function of a lognormal distribution
   maxgauss      - Calculate the mean and variance of max(x) where x is a gaussian vector
   normcdflog    - Calculate the log of the Normal cdf without underflow
   pdfmoments    - Convert between central moments, raw moments and cumulants
   prob2berk     - Convert probability to Berksons
   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
   usasi         - Generate USASI noise (obsolete: use stdspectrum instead)
   v_chimv       - Approximate mean and variance of non-central chi distribution
   vonmisespdf   - Calculate the pdf of the Von Mises (circular normal) distribution

 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)
   activlevg     - Calculate the active level of speech robustly to added noise
   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     - Transformation matrix for a linear/mel/erb/bark-spaced filterbank from dft output 
   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
   mos2pesq      - Convert MOS values to equivalent PESQ scores
   overlapadd    - Reconstitute an output waveform after frame-based processing
   pesq2mos      - Convert PESQ scores to equivalent MOS values
   phon2sone     - Convert signal levels from phons to sones
   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
   v_sigma       - Identify glottal closure and opening intstants from Lx or EGG waveform
   snrseg        - Segmental SNR and Global SNR calculation
   sone2phon     - Convert signal levels from sones to phons
   soundspeed    - Returns the speed of sound in air as a function of temperature
   spgrambw      - Spectrogram with many options
   stoi2prob     - Convert STOI intelligibility measure to probability of correct recognition
   txalign       - Align two sets of time markers
   vadsohn       - Voice activity detector
   v_ppmvu       - Calculate the PPM, VU or EBU levels of a signal

 LPC Analysis of Speech
   ccwarpf       - warp complex cepstrum coefficients
   lpcauto       - LPC analysis: autocorrelation method
   lpcbwexp      - Bandwidth expansion of LPC filter
   lpccovar      - LPC analysis: covariance method
   lpcconv       - Arbitrary conversion between LPC representations
   lpcifilt      - inverse filter a speech signal
   lpcrand       - create random stable filters
   lpcrr2am      - Matrix with all LPC filters up to order p
   lpcstable     - check for stability and force stable filters
   lpc--2--      - Convert between alternative LPC representation

 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
   estnoiseg     - Estimate the noise spectrum from noisy speech using MMSE method
   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
   ssubmmsev     - Speech enhancement using MMSE estimate and VAD-based noise estimation
   specsubm      - (obsolete algorithm) Spectral subtraction 
   spendred      - Speech Enhancement and Dereverberation (Doire's algorithm)

 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
   kmeanlbg      - Vector quantisation: LBG algorithm
   kmeanhar      - Vector quantization: K-harmonic means
   potsband      - Create telephone bandwidth filter
   v_kmeans      - Vector quantisation: k-means algorithm

 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
   convfft       - 1-dimensional convolution/corrolation using FFT
   ditherq       - Add dither and quantize a signal
   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
   v_addnoise    - Add noise to a signal at a chosen SNR
   v_findpeaks   - Find peaks in a signal or spectrum
   v_resample    - Resamples a signal: identical to MATLAB resample but removes filter transients
   v_windinfo    - Calculate window properties and figures of merit
   v_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
   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
   qrabs         - Absolute value of a real quaternion
   qrdivide      - divide two real quaternions (or invert one)
   qrdotdiv      - elmentwise division of two real quaternion arrays
   qrdotmult     - elmentwise multiplication of two real quaternion arrays
   qrmult        - multiply two real quaternion arrays
   qrpermute     - permute the indices of a quaternion array
   rectifyhomog  - Apply rectifing homographies to a set of cameras to make their optical axes parallel
   rot--2--      - Convert between different representations of rotations
   rotqrmean     - Find the average of several rotation quaternions
   rotqrvec      - Apply a quaternion rotation to an array of 3D vectors
   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
   axisenlarge   - Selectively enlarge figure axis for clarity
   cblabel       - Add a label onto the colorbar
   figbolden     - Make a figure bold and adjust colours for printing clearly
   fig2emf       - Make a figure bold and save as a windows metafile
   frac2bin      - Convert numbers to fixed-point binary strings
   lambda2rgb    - convert wavelength to XYZ or RGB colour triplets
   sprintsi      - Print a value with an SI multiplier
   sprintcpx     - Print a complex number with real and imaginary parts
   texthvc       - write text on a plot with specified alignment and colour
   tilefigs      - Arrange all figures on the screen
   v_colormap    - Set and plot colormap information
   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

 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
   gammalns      - Calculates log(gamma(x)) for signed real-valued x
   hostipinfo    - Get information about the computer name and internet connections
   hypergeom1f1  - Confluent Hypergeometric function or Kummer's M function
   logsum        - Calculates log(sum(exp(x))) without overflow/underflow
   minspane      - calculate the minimum (or shortest) spanning tree
   mintrace      - find a row permutation to minimize the trace of a matrix
   m2htmlpwd     - Create HTML documentation of matlab routines in the current directory
   nearnonz      - Replace each zero element with the nearest non-zero element
   paramsetch    - Set a parameter structure and do valididty checks
   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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CROSS-REFERENCE INFORMATION ^

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