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202
CHAPTER
21
The Vocoder of the VIRUS
VOCODER
Although vocoder sounds have
seen a comeback in the recent
time, many musicians do not spe-
cifically know how they work or
even more importantly, how they
sound! Various Vocoder presets are
stored In the last section of SINGLE
bank B (grammalogue ”VOC”).
These SINGLEs require an audio
signal being fed to the external
inputs. The keyboard also needs to
be played on most of the presets.
The Virus Vocoder is not necessar-
ily easy to handle. You should
always refer to an existing Vocoder
preset for editing.
seen a comeback in the recent
time, many musicians do not spe-
cifically know how they work or
even more importantly, how they
sound! Various Vocoder presets are
stored In the last section of SINGLE
bank B (grammalogue ”VOC”).
These SINGLEs require an audio
signal being fed to the external
inputs. The keyboard also needs to
be played on most of the presets.
The Virus Vocoder is not necessar-
ily easy to handle. You should
always refer to an existing Vocoder
preset for editing.
The Vocoder is one of the most
complex sections of the Virus. For
this reason, we recommend that
you use factory sounds that use
the Vocoder as your point of depar-
ture and edit these to create your
own sounds. This means that you
don’t have to start from scratch
and that the Vocoder’s parameters
are set to viable values, which will
facilitate programming consider-
ably.
complex sections of the Virus. For
this reason, we recommend that
you use factory sounds that use
the Vocoder as your point of depar-
ture and edit these to create your
own sounds. This means that you
don’t have to start from scratch
and that the Vocoder’s parameters
are set to viable values, which will
facilitate programming consider-
ably.
A Vocoder creates a new sound by
combining two signals. The timbre
of the so called analysis signal (or
modulator signal) forms the carrier
signal. A typical example for a
modulator signal is the human
voice, another suitable carrier sig-
nal can be a steady tone with rich
harmonics.
combining two signals. The timbre
of the so called analysis signal (or
modulator signal) forms the carrier
signal. A typical example for a
modulator signal is the human
voice, another suitable carrier sig-
nal can be a steady tone with rich
harmonics.
The sound characteristic is being
rendered into the new sound by
two cascades of bandpass filters:
The modulator signal is being send
through several parallel bandpass
filters, which only pass through a
certain part of the whole spec-
trum. Every bandpass filter is fol-
lowed by an envelope follower
which uses the level of the signal
to create a control signal. This part
of the vocoder is called a modula-
tor bank.
rendered into the new sound by
two cascades of bandpass filters:
The modulator signal is being send
through several parallel bandpass
filters, which only pass through a
certain part of the whole spec-
trum. Every bandpass filter is fol-
lowed by an envelope follower
which uses the level of the signal
to create a control signal. This part
of the vocoder is called a modula-
tor bank.
The carrier signal is treated in a
similar way. It is split into several
bands by a chain of bandbass fil-
ters. Different to the technique
used above, the bandpass filters
are not followed by envelope fol-
lowers. The circuit uses amplifiers
which are levelled by the control
signal output of the envelope fol-
similar way. It is split into several
bands by a chain of bandbass fil-
ters. Different to the technique
used above, the bandpass filters
are not followed by envelope fol-
lowers. The circuit uses amplifiers
which are levelled by the control
signal output of the envelope fol-