NEN NPR ISO/TR 4870 : 1993
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
ACOUSTICS - THE CONSTRUCTION AND CALIBRATION OF SPEECH INTELLIGIBILITY TESTS
06-14-2010
01-12-2013
Deals with the description of: a) methods for the construction of speech tests for the measurement of the intelligibility of speech transmitted by an analog or combination analog and digital communication system; b) a reference communication system and test conditions necessary to the development, calibration, and interpretation of the results of standardized intelligibility tests.
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