Vocoders and FFTs

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1 total messages Started by Mark E. Peterson Tue, 15 Dec 1992 04:57

#1845

Author: Mark E. Peterson
Date: Tue, 15 Dec 1992 04:57

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Hello. Reading through the posts on pitch shiftings I have heard nothing
about using FFTs to reconstruct voice signals using different sets of
frequencies. Is this sort of method used for vocoders? Would a 256 point
FFT be enough to do the job if you just modulated 256 certain sine waves
together according to amplitude? I would like to experiment with the
sort of idea, but I'd like to learn if it's been done before. I want to
do it in real time. I have the integer FFT posted a few days ago that
can do a real-time FFT in 2.6 milliseconds.. That combined with averaging
256 sine waves could be accomplished barely in real time at 4Khz at least.
Has anyone had or heard of any success with this?

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