Re: Some Common FFT Misconceptions

On Mar 29, 9:06 pm, Steve Underwood <ste...@xxxxxxx> wrote:
glen herrmannsfeldt wrote:
buleg...@xxxxxxxxxxxxxxx wrote:
(snip)

I don't know how the ear works relative to spectrum , but I could
imagine that a musical intrument could play a note at a certain
frequency, but has higher energy content on a higher harmonic, and the
ear may still perceive the fundamental tone.

This is supposed to be true. You can electrically generate
them with no amplitude in the fundamental and still hear it.

I once had a book (with a recording included) that did a study
with tones having 'harmonics' at factors of 2.1, called
stretched. They sound horrible.

By smoothly changing its relative harmonic energies in the right way as
a tone is swept, it is possible to create a tone which appears to rise
or fall in frequency forever. An auditory equivalent of an optical
illusion. It sounds really odd. This depends on the ear being tricked
about the musical fundamental it is hearing amongst a set of harmonics.

Steve

The ASA has an Auditory Demonstrations CD that includes a demo of the
"constantly rising" effect.

http://asa.aip.org/discs.html

Dale B. Dalrymple
.

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