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ACCESS VIRUS OS4
203
Vocoder
lowers of the modulator banks.
This part of the vocoder is called
the carrier bank or synthesis part.
This part of the vocoder is called
the carrier bank or synthesis part.
As soon as the modulator detects a
signal in a certain frequency range,
its envelope follower levels the cor-
responding band in the synthesis
part. In other words: Just the fre-
quency band of the carrier signal
(the steady tone), which is a part of
the modulator signal (the spoken
voice) in this second, is being
passed to the output. This is why
the steady tone starts to speak.
The pitch of the output signal
depends on the carrier. If a cord,
e.g. a polyphonic pad sound is
being used instead on a single
tone, you can listen to a typical
vocoder choir. Of course, you can
use a different Modulator than a
spoken voice. Have a try with a
drumloop!
signal in a certain frequency range,
its envelope follower levels the cor-
responding band in the synthesis
part. In other words: Just the fre-
quency band of the carrier signal
(the steady tone), which is a part of
the modulator signal (the spoken
voice) in this second, is being
passed to the output. This is why
the steady tone starts to speak.
The pitch of the output signal
depends on the carrier. If a cord,
e.g. a polyphonic pad sound is
being used instead on a single
tone, you can listen to a typical
vocoder choir. Of course, you can
use a different Modulator than a
spoken voice. Have a try with a
drumloop!
All you need is the internal synthe-
sizer of the Virus. It is also possible
to process external signals. The
feature set of the VIRUS includes
32 filter bands, shifting the fre-
quency’s relation of modulator and
carrier, adjustable quality (Q-fac-
tor) of the filter bands and much
more. By using a multi patch and
sizer of the Virus. It is also possible
to process external signals. The
feature set of the VIRUS includes
32 filter bands, shifting the fre-
quency’s relation of modulator and
carrier, adjustable quality (Q-fac-
tor) of the filter bands and much
more. By using a multi patch and
the auxiliary sends, sounds can be
filtered or combined (see above).
The vocoder substitutes the whole
filter section of a single sound.
Therefore, you can access the
vocoder’s parameters via the filter
section on the front panel (see Fil-
ter Envelope Release and addi-
tional notes).
filtered or combined (see above).
The vocoder substitutes the whole
filter section of a single sound.
Therefore, you can access the
vocoder’s parameters via the filter
section on the front panel (see Fil-
ter Envelope Release and addi-
tional notes).
The VIRUS’s vocoder consists of dif-
ferent sections which perform dif-
ferent tasks:
ferent sections which perform dif-
ferent tasks:
The Modulator Bank
This cascade of bandpass filters
split the frequency spectrum of
the modulator into slices, quite
similar to the way a studio fre-
quency analyser would.
split the frequency spectrum of
the modulator into slices, quite
similar to the way a studio fre-
quency analyser would.
The Envelope Follower
The level at the output of each
bandbass filter is measured by the
modulator bank. The resulting con-
trol signal can be modified by an
ATTACK
bandbass filter is measured by the
modulator bank. The resulting con-
trol signal can be modified by an
ATTACK
and DECAY parameter.
These signals are no audio signals,
as they contain the envelope of the
signal being analysed.
as they contain the envelope of the
signal being analysed.