Re: About importance of "phase" in sound recognition

[James Johnston <James.Johnston@xxxxxxx>]

May I propose a simple test.

Get out matlab.

Do a 2^20th fft.
In the bin corresponding to 500Hz, your choice of sampling frequencies, put a '1'.
In the bins corresponding to 996 and 1004, put a .25.

Conjugate appropriately.

Do IFFT.

Set energy of the time domain signal to something sensible.
Listen to it.

Now, instead of putting in .25 for the 1004Hz tone, put in -.25

Repeat, using the same gain so as to avoid intensity differences.

Listen to that.

Were I allowed to release code, I would include the matlab code to make your life easier. It's not exactly rocket sicence.

To me, at least, they are different sounds.


Jj


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