The width of a BAND; the difference between the highest and lowest frequencies of a band, sometimes expressed in standard sizes, such as OCTAVE, half-octave, third-octave.
Technically, bandwidth is measured between the cut-off points of a FILTER or equalizer where the signal is attenuated -3 dB, also called the half-power points.
See: diagram under FILTER. See also: BROAD BAND NOISE, CENTRE FREQUENCY, EQUALIZATION, NARROW BAND NOISE, SOUND ANALYSER, SOUND SYNTHESIS, SOUND SYNTHESIZER, TRANSIENT RESPONSE. Compare: INTERVAL.