Synthesis

In audio and music technology, synthesis refers to producing sound by electronic or digital means rather than recording acoustic sources. Synthesizers achieve this by generating raw waveforms — such as sine, square, sawtooth, or triangle waves — which are then shaped using filters, envelopes, and modulators to form complex and expressive tones.

There are several primary types of synthesis, each based on a distinct principle of sound generation. Subtractive synthesis begins with harmonically rich waveforms and removes certain frequencies using filters to sculpt the final sound. Additive synthesis builds tones by combining individual sine waves at different frequencies and amplitudes. Frequency Modulation (FM) synthesis creates complex timbres by modulating one waveform’s frequency with another, producing intricate overtones. Wavetable synthesis uses pre-recorded or mathematically derived waveforms stored in memory, while sample-based synthesis relies on recordings of real instruments or sounds as the foundation for playback and manipulation.

Other advanced methods include granular synthesis, which divides sounds into small fragments (grains) for recombination, and physical modelling, which simulates the behaviour of acoustic instruments through mathematical algorithms.

Synthesis parameters such as oscillators, filters, envelopes, and low-frequency oscillators (LFOs) allow extensive control over pitch, timbre, and dynamics. Modern synthesizers often combine multiple synthesis types and incorporate digital effects, modulation matrices, and real-time control interfaces for expressive performance.

Synthesis underpins much of modern music and sound design, from analogue modular systems and digital workstations to software instruments and virtual synthesisers. It allows sound creators to move beyond traditional timbres, shaping entirely new sonic textures that define contemporary music production.