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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 synthesizer of the Virus. It is also possible to process external signals.
The feature set of the VIRUS includes 32 filter bands, shifting the frequency’s relation of modulator
and carrier, adjustable quality (Q-factor) 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 Filter Envelope Release and additional notes).
The VIRUS’s vocoder consists of different sections which perform different 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 frequency analyser would.
THE ENVELOPE FOLLOWER
The level at the output of each bandbass filter is measured by the modulator bank. The resulting
control 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.
THE CARRIER BANK
The signal is treated in a similar way to the signal which passes the modulator bank. In this case,
the carrier signal is split by the bandpass filters. Each bandpass of the carrier bank corresponds to
one of the modulator bank. Usually, both bandpasses use the same frequency slice. Similar to a
synthesizer’s envelope, the signal level being measured by the envelope followers of the modulator,
is used to control the level of the carrier’s filter. Last, but not least, the individually controlled signals
of the carrier bank are reunified to create the vocoder’s output sound.
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