Erik has said everything. Here is an example to apply the dither to a
soundfile during the conversion to 16bit (and not 16->24, unless you
don't want to deliberately add some noise to the sound), using SoX:

  sox hq.wav -2 cd_quality.wav dither -s -f shibata

I often apply this type of noise-shaping algorithm. However, it is not
universal, some sounds (and/or person) ask for different shapes.

See  http://sox.sourceforge.net/SoX/NoiseShaping

I have attached the code that I have written for producing some tests.
`sine.csd' creates the test sound, a sine wave at 44.1Khz -90dB 24bit
(as in the SoX/NoiseShaping page) and the makefile generates png and
wav files (16bit) for your eyes and ears.

tar xvfz dither_test.tar.gz
cd dither_test
make
YOUR_BROWSER dither_tests.html

tito

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