.....
'
.......
Section 5 - The Vocoder
Section 5 - The Vocoder
About the Vocoder
'The
DP
/ 4 features a vocoder. A vocoder analyzes the frequency spectrum from
an
incoming
source (most
commonly
speech from a microphone)
and
applies
that
analysis
to
the
pitched
sounds
from the
output
of
another
source (like a synthesizer or sampler).
---+-.~
Input 1 (vox) DP/4 sees
\
and
applies it
to the carrier
------+.~-
How the Vocoder Works
DP/4 Output
In the
DP
/
4,
the
vocoder
uses all four units to perform one function.
'The
four algorithms
that
make
up
the vocoder each cover a different frequency
band
. They are connected
in
parallel
so
that
they
all receive the
same
two
inputs. The vocoder algorithms analyze the
incoming
signal
(Input
1)
and
apply
it
to
another
source (Input
2).
The vocoder config preset joins
the
four
different algorithms (Vocoder Low, Vocoder MidI, Vocoder Mid2,
and
Vocoder High)
which
work
together to create
the
vocoder effect.
Input 1
Spectrum
(vox)
Analyzer Sibilance
Extractor
Input 2
Real Time Dynamic
+
Vocoded
(carrier)
Multi-band EQ
Output
The incoming voice signal (vox), connected to Input
1,
is sent to the Spectrum
Analyzer
. The
bandpass
filters
within
the
Analyzer divide the voice signal into separate frequency
bands.
The
Analyzer then
measures
the
signal level
in
each of these
bands
and
supplies this information
to
the Real Time Dynamic Multi-band EQ. This EQ section divides the carrier signal
(Input
2)
into
separate
frequency bands. The
output
level of each of these
bands
is controlled
by
the
signal
level
measured
in
the corresponding
band
of the analyzer. The result is that the frequency
spectrum
of the Carrier signal is forced to match the spectrum of the Vox signal. There is also
an
internal signal from
the
Vox
input
that
bypasses the spectrum analyzer
and
sends
the
high-
frequency sibilance
sounds
(t's,
p's,
clicks, pops, etc.) directly to the
output
for
improved
articulation.
ENSONIQ
DP/4
Musician's Manual
131
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