Bob Douglas asks:
>
> Is this the same device that was pioneered by Jeff Beck and later done
to
> death by Peter Frampton?
Well, AFAIK,
That effect used a small monitor speaker, in an enclosed space that
ended with
a tube that was placed inn the mouth: like the mouth-bows of Africa, it
used
the resonance of the mouth cavity itself to filter the source.

The B-B's talkbox, again, seems different. But there are many settings
to
the various emulations of the old "Vocoder", and their's might be one.
The overall effect is *usually* generated by measuring energy in several

freq. bands, and using subtractive methods ('filters') to match source's

"spectral envelope" on new sound source. or something like this?  I have
heard
this done with fancy bp-filters, even with FFT techniques. (See CLM
distribution)
Does anyone know of alternative approaches? (Obviously LPC uses a single

multi zero(in analysis)/pole(in synthesis) filter: this is adjusted for
maximal
energy capture as all-zero, then the all-pole conjugate is used to apply
the
captured spectral envelope to new source: *not* the same as the
multi-*channel*
approach, at all.....)

any input?
charlieb


>              
> Is this the same device that was pioneered by Jeff Beck and later done to
> death by Peter Frampton?

That effect used a small monitor speaker, in an enclosed space that ended with
a tube that was placed inn the mouth: like the mouth-bows ofAfrica, it used
the resonance of the mouth cavity itself to filter the source.

The B-B's talkbox again, seems different. But there are many settings to
the various emulations of the old "Vocoder", and their's might be one.
The overall effect is *usually* generated by measuring energy in several 
freq. bands, and using subtractive methods ('filters') to match source's
"spectral envelope" on new sound source. or something like this?  I have heard   s
this done with fancy bp-filters, even with FFT techniques. (See CLM distribution)
Does anyone know of alternative approaches? (Obviously LPC uses a single 
multi zero(in analysis)/pole(in synthesis) filter: this is adjusted for maximal
energy capture as all-zero, then the all-pole conjugate is used to apply the
captured spectral envelope to new source: *not* the same as the multi-*channel*
approach, at all.....)

any input?         
charlieb