SCIM: A METER FOR MEASURING THE PERFORMANCE OF SPEECH COMMUNICATION SYSTEMS
BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA
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An electronic device called SCIM Speech Communication Index Meter was designed primarily in terms of the Articulation Index theory however, SCIM accommodates additional factors affecting speech that are not involved in the original procedures for calculating AI. The SCIM signal generator generates a 3- second signal burst, which is fed to the electrical input of the system under test within 12 seconds the SCIM analyzer, located at the receiving station, calculates and displays an index, ranging from .00 to .99, which reflects the ability of that system to transmit intelligible speech. Although devices based on similar principles have been previously developed, SCIM measures several parameters affecting the performance of a speech system differently than did previous instruments. SCIM was designed to be relatively small, have small power requirements, be capable of remote digital readout, and contain other features to make it suitable for field, fixed station or laboratory use. The results of SCIM measurements and actual speech intelligibility tests obtained from a variety of communication systems and operating conditions are presented.
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