[sdiy] Speaking of the Elektor Vocoder (and the Korg Vocoder)

[anthony]

I tossed in the phase vocoder as an aside - it didn't really fit in with 
this message. But google phase vocoder. I think it is like frequency domain 
FFT except the phase is the domain.

I suppose a filter-bank could be thought of as a crude or coarse FFT. The 
more and narrower the filterbanks the more it would come to approximate an 
FFT - maybe in this case FT. Well actually, doing it analog, it's sort of 
instantaeous. But I wonder if the transfer function of a bunch of filter 
banks has the same math behind it as the actual  Fast Fourier Transform, 
which as I understand it, is a recursive algorithm.

Math guys?

AA

> What's a phase vocoder?  Isn't a normal vocoder a sort of limited 
> resolution FFT, or at least FT in that it translates time domain 
> information into frequency domain information in the form of voltage 
> levels per frequency band?
>
> Dave
>
> anthony wrote:
>> I haven't built a hardware vocoder yet, but I will make a comparison when 
>> I do. I don't think anyone has ever done a hardware implemented "phase 
>> vocoder" which is a different beast. But a lot of the principles are the 
>> same. I've always wondered if it was possible to make a hardware fast 
>> fourier transform analyzer. But I digress...
>>
>> I think hardware vocoders may have the benefit of being standalone 
>> "hands-on" units
>>
>> When I compare the two, I'll let you all know.
>>
>> cheers,
>> Anthony
>>
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