MOTM

How do vocoders determine whether a sound (usually
vocal) is voice or unvoiced?  I have looked at some
scheamtics, but I am not 100% sure what is going on.

What it is determined whether a sound is voice or
unvoiced, how is the vocal handled differently?

When making this determination, is it instantaneous or
is there a "frame" in which it is performed?  Are
there ever problems with the signal fluctuating
rapidly between voiced and unvoiced?  If so, what kind
of artifacts result?

Thanks!
Shemp

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