A synthesiser is an electronic device or software program that creates sound by generating and shaping audio signals. In practice, it may turn button presses, MIDI messages, or sequencer steps into tones, effects, and rhythms. Small hardware synths are common embedded systems: they rely on limited memory, tight timing, and firmware that must respond predictably to user input.
In cyber security, synthesisers matter because any audio engine is also a parsing and control surface. Attackers may try to crash or stall software by feeding unexpected input, overloading real-time processing, or abusing firmware bugs in connected devices. Defenders look for memory-safety issues, weak input validation, and resource-exhaustion risks. A well-designed synthesiser should fail safely, keep timing stable, and treat every external control as a boundary that needs validation.