American National Standard Method for Measuring the Intelligibility of Speech over Communication Systems
A 34 page standard was published in May 2009 by Acoustical Society of America. It was developed as a revision of ANSI S3.2 : 1989.
Provided are three alternative sets of English word that are to be spoken by trained talkers over the comm system under evaluation. Words are carefully selected according to purpose and constraint of the test situation. Trained listeners are made to record words they hear. Resulting intelligibility of the speech of the system is then expressed as the fraction of correctly identified words.
The system may consist of the air and the room or outdoors in face-to-face communications; the equipment and environments used in telephony, public address systems, or ordinary radio; or complex systems of environment, equipment, and air, wire, fiber, radio, and water paths used in some military, space, remote, or emergency communications. The standard specifies test materials that have been thoroughly validated. The standard also specifies methods for selecting and training the talkers and listeners; for designing, controlling, and reporting the test conditions; and for analyzing and reporting the test results.
Ordering information
This standard can be obtained in both PDF and printed edition.
