Similarly, Sharp X68000 and MSX ( Yamaha computer unit) also use FM-based soundchip, OPM.ĭigital frequency modulation synthesis was developed by John Chowning The related OPN2 was used in the Fujitsu FM Towns Marty and Sega Genesis as one of its sound generator chips. OPNB was used as main basic sound generator board in SNK Neo Geo operated arcades (MVS) and home console (AES).
Through sound cards like the AdLib and Sound Blaster, IBM PCs popularized Yamaha chips like OPL2 and OP元. Yamaha's groundbreaking DX7 synthesizer, released in 1983, brought FM to the forefront of synthesis in the mid-1980s.įM synthesis had also become the usual setting for games and software until the mid-nineties. The Synclavier I, manufactured by New England Digital Corporation beginning in 1978, included a digital FM synthesizer, using an FM synthesis algorithm licensed from Yamaha.
Yamaha built the first prototype digital synthesizer in 1974, based on FM synthesis, before commercially releasing the Yamaha GS-1 in 1980. Digital FM synthesis (implemented as phase modulation) was the basis of several musical instruments beginning as early as 1974. However, FM synthesis can also be implemented digitally, which is more stable and became standard practice.
inharmonic), inharmonic bell-like and percussive spectra can be created.įM synthesis using analog oscillators may result in pitch instability. Through the use of modulators with frequencies that are non-integer multiples of the carrier signal (i.e. As the amount of frequency modulation increases, the sound grows progressively complex. To synthesize harmonic sounds, the modulating signal must have a harmonic relationship to the original carrier signal. įM synthesis can create both harmonic and inharmonic sounds. The frequency of an oscillator is altered "in accordance with the amplitude of a modulating signal". The time domain signals are illustrated above, and the corresponding spectra are shown below (spectrum amplitudes in dB).įrequency modulation synthesis (or FM synthesis) is a form of sound synthesis whereby the frequency of a waveform is changed by modulating its frequency with a modulator. A 220 Hz carrier tone f c modulated by a 440 Hz modulating tone f m, with various choices of frequency modulation index, β.
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