Vocoder output

[Eli Brandt]

jbv wrote:
> Looking at the synthesizer section of the block diagram of the ETI
> vocoder, I noticed that the outputs of bands 3,5,7,9,11,13 are=20
> sent to an =93inverting mixer=94 before being fed into the final=20
> output mixer, along with outputs 1,2,4,6,8,10,12,14.
> Of course, my question is : why is it so ? Is there any phase=20
> problem between contiguous bands ?  And why is it different=20
> in the Elektor vocoder, in which all bands outputs are sent=20
> to one single mixer ?

Maybe the ETI is six-pole while the Elektor is four-pole, and they're
trying to avoid putting zeros between bands?  Um, I'm not sure this
suggestion makes sense; I'll have to dredge my systems theory out
of cold cortical storage.

-- 
     Eli Brandt  |  eli+ at cs.cmu.edu  |  http://www.cs.cmu.edu/~eli/