Objective measurement techniques for evaluating voice communication channels
R. W. Hubbard, William J. Hartman · Defense Technical Information Center (DTIC) · 1974
The report presents methods for objectively evaluating the quality of voice communication circuits, based upon the Articulation Index (AI). The Speech Communication Index Meter (SCIM) and associated computer programs for calculating AI are discussed in some detail and procedures are presented for making system measurements.