There are many fantastic resources available online that give a much betterĮxplanation of FM synthesis than I can offer. The above diagram demonstrates the variable rate of change in the phaseĪngle of the modulated carrier wave’s signal. Of a signal (the modulator) to adjust the frequency of another signal (the carrier).Īs convoluted as this sounds, it makes more sense when visualised: In mathematical terms, FM synthesis is achieved by using the instantaneous amplitude Published by the Audio Engineering Society, and would ultimately become United States Patent No. Their work together would yield the paperĪudio Spectra by Means of Frequency Modulation , So Chowning enlisted the help of fellow academic Andy Moore from Stanford's Artificial Intelligence Lab to come up or in fact any other kind of software- to be patented under United States law 1, Interestingly, at this point in history it was not actually possible for an algorithm The significance of Chowning's discovery was not lost on his colleagues, who urged him Through a controlled application of this processĪ much wider range of tones could be synthesised than was possible using contemporary analog synthesisers. That as the frequency of the modulating wave increased into the audible spectrum newĪnd interesting harmonic partials were created in the carrier tone, while retaining the While experimenting with the modulation of a sound wave’s frequency, Chowning discovered Inspired by the groundbreaking work of Max Mathews at BellĬhowning shifted his course of study from music composition to focus on computer music. Technology had its origins in the research of Stanford University professor John M. The frequency modulation synthesis that forms the basis of Yamaha’s FM synthesiser It would become the first commercially successful digital synthesiser, going on to sell over 200,000 units worldwide. By all accounts it was revolutionary, its brassy, metallic timbres would go on to define the
It would introduce musicians to a world of new timbral possibilities not possible with its analogĬontemporaries. In 1983 Yamaha Corporation released the now iconic DX7 synthesiser.įeaturing a novel form of digital tone synthesis called frequency modulation,
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