In a vocoder the series of bandpass filters are controlled by the modulating signal. Frequencies outside this range are blocked. See also below for a simple illustration of how a bandpass filter operates:Ī bandpass filter will only let through frequencies between a lower threshold (f1) and a higher threshold (f2). In essence, this is done via a series of bandpass filters - letting through the carrier frequencies that are detected in the modulator and rejecting those that aren’t.
Vocoding is the process is letting the frequency spectrum of one sound (the modulator) modulate the frequency spectrum of another sound (the carrier). FL Studio 9 tutorial explaining the Vocodex plugin
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