The SPM-1 Stereo Performance Meters measures the stereo separation of source program audio content. Stereo mid-down and left/right blending can now be measured and thus set to consistent and repeatable standards.
An entirely new technology is described that accurately measures the stereo separation that resides within an audio program. This measurement is made with whatever complex waveforms happen to constitute the left and right channel. A computer cross-correlates the multiple frequencies, phases, and amplitudes comprising the
