Frequency modulation synthesis - Revolvy

Learn about using our beloved oscillators for basic frequency modulation synthesis.

Wiki: Frequency modulation synthesis - upcScavenger

At the same time, the frequency of the modulating signal causes signals to appear at frequencies above and below the carrier frequency. Therefore for each frequency component in the modulating signal, an appears above Fc, and a appears below Fc. A complex modulating waveform (containing more partials than a simple sinewave) will create sidebands corresponding to each of its sinewave components.

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In simple terms, the "louder" the modulating signal is, the more the carrier frequency changes. For illustration, suppose Fc is 1000 Hz. Modulation amplitude might be applied that causes the carrier to swing between 900 Hz and 1100 Hz, that is, 100 Hz in either direction. This is termed a "deviation" of 100 Hz.

In simple terms, the "louder" the modulating signal is, the more the carrier frequency changes. For illustration, suppose Fc is 1000 Hz. Modulation amplitude might be applied that causes the carrier to swing between 900 Hz and 1100 Hz, that is, 100 Hz in either direction. This is termed a "deviation" of 100 Hz.


Frequency Modulation Synthesis – 120 Years of …

For synthesizing harmonic sounds, the modulating signal must have a relationship to the original carrier signal. As the amount of frequency modulation increases, the sound grows progressively more complex. Through the use of modulators with frequencies that are non-integer multiples of the carrier signal (i.e. non harmonic), bell-like dissonant and percussive sounds can easily be created.

Digital frequency modulation - Revolvy

In and frequency modulation synthesis (or FM synthesis) is a form of where the of a simple waveform is changed by it with a modulating frequency that is also in the audio range, resulting in a more complex waveform and a different-sounding tone. The frequency of an oscillator is altered or , "in accordance with the of a modulating signal." (Dodge and Jerse 1997, p.115)

All-digital RF frequency modulation - IEEE Xplore …

The ratio of deviation to modulation frequency is called the"index of modulation". ( I = d / Fm ) This ratiocontrols the spectral richness of the sound. By varying deviationthrough modulation amplitude, and varying the spectrum of themodulating waveform, the resulting audio can be evolved withoutfurther instrument complexity. This is the power of FMsynthesis.

Delta-Sigma Modulation in Direct Digital Frequency Synthesis

FM synthesis is very good at creating both harmonic and inharmonic ("clang", "twang" or "bong" noises) sounds. Complex (and proper) FM synthesis using analog is not generally feasible due to their inherent pitch instability, but FM synthesis (using the frequency stable phase modulation variant) is easy to implement digitally. As a result, FM synthesis was the basis of some of the early generations of from Yamaha, with Yamaha's flagship synthesizer being ubiquitous throughout the 1980s. Yamaha had patented its hardware implementation of FM, allowing it to nearly monopolize the market for that technology. developed a related form of synthesis called , used in its CZ series of synthesizers. It had a similar (but slightly differently derived) sound quality as the DX series.

In audio and music frequency modulation synthesis ..

At the same time, the frequency of the modulating signal causessideband signals to appear at frequencies above and belowthe carrier frequency. Therefore for each frequency component inthe modulating signal, an upper sideband appears aboveFc, and a lower sideband appears belowFc. A complex modulating waveform (containing morepartials than a simple sinewave) will create sidebandscorresponding to each of its sinewave components.