% error: ausave('filename.ext', x, fs, format)
%
% Writes an audio file with the appropriate header. The extension on
% the filename determines the layout of the header. Currently supports
% .wav and .au layouts. Data is a matrix of audio samples in the
% range [-1,1] (inclusive), one row per time step, one column per
% channel. Fs defaults to 8000 Hz. Format is one of ulaw, alaw, char,
% short, long, float, double
%
% Note that translating the symmetric range [-1,1] into the asymmetric
% range [-2^n,2^n-1] requires a DC offset of -2/2^n. The inverse
% process used by auload requires a DC offset of 2/2^n, so loading and
% saving a file will not change the contents. Other applications may
% compensate for the asymmetry in a different way (including previous
% versions of auload/ausave) so you may find small differences in
% calculated DC offsets for the same file.