Matlab: This guy has written a synthetic positioning system

Matlab: there are four major public hrtf resources

how to make a Shepard tone in Matlab: http://hebb.mit.edu/courses/9.29/2003/athena/auditory/shepard.html
and here is the Matlab code: http://hebb.mit.edu/courses/9.29/2003/athena/auditory/matlab/playshepard.m

Matlab seems to have its own Shepard tone implementation: http://www.mathworks.co.uk/matlabcentral/fileexchange/11347-shepardtone/content/shepardTone.m

'Code will load a head-related transfer function (HRTF), convert it to the non-standard form (NSF) and the convolve it with a WAV-format audio file. The convolution is done in the wavelet domain, and the result is a (approximated) localized sound clip.'

Synthetic: http://www.dei.unipd.it/~spagnols/pubbl/SITIS11.pdf

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