Phase Correlation Meter

An audio meter designed to indicate the phase relationships (correlation) between left and right stereo audio signals. Various meter formats are used, but most are scaled from +1 to -1, with zero at the centre. Full correlation (ie. dual-mono) is shown as +1, while opposite polarity is shown as -1. Fully-wide stereo material (decorrelated) would register around 0. Signals indicated anywhere between +1 and 0 are considered mono-compatible. Dips below 0 towards -1 suggest a listener of the summed mono signal will hear coloured or severely attenuated audio.