The Vocoder; About The Vocoder; How The Vocoder Works - ENSONIQ DP/4 Musician's Manual

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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).
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Input 1 (vox)
DP/4 sees
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and applies it
to the carrier
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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
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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