How does an electronic organ produce sound?

An electronic organ produces sound by generating electrical signals that are subsequently converted into audible sound through a loudspeaker. The methods used to generate these signals have evolved significantly over time:1

• Electronic Oscillators: Many electronic organs rely on circuits called oscillators to produce alternating current at specific frequencies, which correspond to different musical pitches.1
• Electromechanical Generators: Some instruments, most notably the Hammond organ, utilize motor-driven rotary generators to create sound signals.12
• Subtractive and Additive Synthesis: Many organs use subtractive synthesis, where harmonic-rich signals are shaped by filter circuits to simulate the resonant characteristics of traditional pipe organs. Conversely, additive synthesis involves combining individually generated sine waves to build complex waveforms.3
• Digital Sampling: Modern computer organs often use digital microcircuitry to retrieve and play back prerecorded (sampled) sounds of conventional pipe organs.1

Regardless of the generation method, the resulting electronic signals are amplified and radiated as sound through a loudspeaker system.12