In a bandpass equalizer, the ratio of center frequency to bandwidth.
A measure of the sharpness of resonance.
System of recording and reproduction using four channels and four loudspeakers in an attempt to recreate a 360 degrees sound field around the listener.
A process in which the range of values of a wave is divided into a finite number of smaller sub-ranges, each of which is represented by an assigned or "quantized" value within the sub-range.
