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Continuous signal that directly represents sound, used in vinyl records, magnetic tape, and older broadcast radio.

Two-channel audio that provides a sense of space and dimension to the sound, standard for music and home cinema.

Multi-channel audio designed to envelope the listener, commonly used in theaters and home entertainment systems.

Protocol for recording and playing back music on digital synthesizers that is not a sound wave but a series of messages like 'note on,' 'note off,' 'pitch bend,' and others.

Single-channel audio, where all sounds are mixed to one channel, used for single-speaker setups and some radio transmissions.

Represents audio signals through binary data, used in computers, CDs, and digital audio transmission.

Uses two inverted signals to reduce noise interference, often found in professional audio equipment.