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A continuous, pure tone of fixed pitch and amplitude.

An artificially created or enhanced sound used to emphasize artistic or other content of films, television shows, live performances, animation, video games, music, or other media.

A sound that is modulated in short, regular bursts at approximately 1 Hz. This class is not for heartbeat sounds, use /m/01jg02.

A sound of very low frequency (e.g., below 20 Hz) such that is not perceived, or barely perceived, by human listeners.

Low frequency sound energy in the range from 16-256 Hz.

The sound of a simple linear resonator in free oscillation in response to an impulse of excitation, usually ending in an exponentially decaying sine tone.