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Department of Electrical Engineering - Columbia University

SPEECH AND AUDIO PROCESSING AND RECOGNITION

ELEN E6820 - Spring 2001

Matlab resources

This page links to the various Matlab resources associated with the course. Most of these resources are located in the course Matlab directory.

• 2001-03-06: Music analysis/synthesis:
  • Matlab diary showing sinewave analysis and resynthesis (see also this separate tutorial)
  • ifgram.m calculate short-time Fourier transform and instantaneous-frequency gram (by phase difference along time)
  • extractrax.m humungous sinusoid peak picking and track forming routine (uses quadmaxloc.m peak interpolator)
  • colinterpvals.m linear interpolation of between-bin values on each column of a matrix (to get accurate frequency and phase estimates)
  • synthphtrax.m resynthesis of sinusoid models including phase constraints
• 2001-02-27: Speech models:
  • Matlab diary for calculating cepstrum
  • Matlab diary for LPC analysis/synthesis
  • lpcfit.m framewise LPC analysis (or see version using the Durbin recursion which actually runs slower under Matlab)
  • lpcsynth.m resynthesis based on LPC analysis parameters
  • lpca2frq.m my version of the program to extract formant frequencies and magnitudes from the LPC parameters
  • synthtrax.m resynthesis of sinusoid models from frequency/magnitude samples (uses simple linear interpolator slinterp.m)
• 2001-02-20: Matlab Auditory Demonstrations:
  • Sheffield home
  • local copy
• 2001-02-13: Pattern recognition:
  • Matlab diary
  • nntrain.m neural net training
  • nnfwd.m neural net forward pass
  • nngridsamp.m sampling the 2 dimensional input space of a neural net over a grid
  • gmmest.m estimate Gaussian mixture model (GMM) by EM
  • gmmval.m calculate likelihood under a GMM
  • gmmplot.m plot the component Gaussians of a GMM in 2-D
  • gmmgridsamp.m sampling the outputs of a GMM over a 2-D grid
• 2001-02-06: Acoustics:
  • Matlab diary
  • Traveling wave simulation
  • Plucked string simulation (or see the cleaned up version)
  • Animation of sinusoidal standing waves
• 2001-01-23: Timescale modification:
  • Matlab diary
  • SOLAFS code
  • PVOC code
  (see also corresponding sound examples)