scott wrote:
>> You can reduce this by using another window function - but then, 
>> strictly speaking, you're multiplying your signal by a window, which 
>> convolves its spectrum with the spectrum of the window. In other 
>> words, by windowing the signal you're blurring its spectrum.
> 
> Usually a slightly blurred spectrum is the preferred outcome.

Preferable to phantom frequencies, sure...

>> This says many things. But most obviously, it says that the sum of any 
>> two waves is also the product of two *other* words, and vice versa. So 
>> the question is, at what frequency does a wave become "sound" rather 
>> than "variation in sound"?
> 
> 20 Hz?

That's approximately the lowest frequency that the human ear can 
mechanically detect. There's no particular reason to expect this to be 
in any way related to the rate of change in frequency spectrum that the 
human mind can percieve. (One is related to the physics of the ear, the 
other is related to the internal operation of the brain...)

>> The *other* question, of course, is "how many frequency bands do I need?"
> 
> Experiment!

Science: It works, bitches! :-D

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