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Modulation means using one signal to affect another signal. A simple example of Frequency Modulation synthesis (FM) consists of one oscillator (the MODULATOR), modulating the frequency of another oscillator (the CARRIER). This procedure produces additional frequencies called SIDEBANDS which form symmetrically around the original frequency of the CARRIER. For example, here is a simple FM patch:
One of the advantages of AM, like its cousin, RM, is that usingjust two signals or oscillators, we can create somepartially rich signals. Using a harmonically dense signalsuch as a square wave oscillator can create a wealth of sidebandsfrom a minimum of control parameters and computation. Control overthese generated partials may not, however, be as detailed andstraightforward as techniques such as additive synthesis. As aresult, we find that AM and RM is used more often in signalprocessing than signal generation.
Amplitude Modulation - DigiSynth I - Google Sites
Split-sideband synthesis (SpSB)—which is related to the well-known principles of waveshaping, single-sideband modulation, and frequency modulation—offers the possibility of creating four independent sideband outputs: upper, lower, odd, and even. Novel spectra and timbres can be created by the way in which these four outputs are combined. As with similar techniques for distortion synthesis, an SpSB process is controlled by the modulator and carrier frequencies as well as the modulation index. The technique can also be used as an adaptive effect applied to arbitrary monophonic signals. A number of sound samples illustrate the technique.
Amplitude modulation - Wikipedia
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