matrixing

This was achieved on the two stereo channels by electronic "matrixing", where the additional channels were combined into the main signal.

Michael Gerzon: Sound reproduction system with matrixing of power amplifier outputs, US Patent 4,139,729.

Left Right Center Rear Matrixing works like Boolean logic by comparing the information on the left and right optical tracks to determine which speaker to send the signal to.

Thus color-indicating information in the sensor's raw data requires "aggressive" matrixing (essentially, removal of common-mode signals) to produce color data in a standard color space, which can increase color noise in low-light situations.