IEEE 258-1965 IEEE Test Procedure for Close-Talking Pressure-Type Microphones

standard by IEEE, 01/15/1965

Full Description

Scope

This document describes a practical and reproduciblemethod of evaluating the performance characteristicsof a close-talking microphone by meansof quantitative measurements of the microphonecharacteristics using a standard artificial voice. Termsassociated with microphones and their testing aredefined. Test procedures, methods of presentation ofdata, and a standard artificial voice are specified. Thetests described in this document involve physical,steady-state measurements only. The data obtainedshould be sufficient to enable an evaluation of qualityand performance of a given microphone in a speechcommunication system. However, since it is sometimesdesirable to obtain a subjective evaluation ofa microphone, a procedure for a qualitative performancetest is described in Appendix I.Several sections of the document specify experimentallimits to account for the effect of the testprocedures on the accuracy of the data. These limitshave been chosen so that results within the range ofnormal engineering accuracy will be obtained.

Abstract

New IEEE Standard - Inactive-Withdrawn.A close-talking pressure-type microphone is anacoustic transducer which is intended for use in closeproximity to the lips of the talker and is either hand-held or boom-mounted. Various types of microphonesare currently used for close-talking applications.These include carbon, dynamic, magnetic,piezoelectric, electrostrictive and condenser types.Each of these microphones has only one side of itsdiaphragm exposed to sound waves, and its electricoutput substantially corresponds to the instantaneoussound pressure of the impressed sound wave.Since a close-talking microphone is used in thenear sound field produced by a person's mouth, it isnecessary when measuring the performance of suchmicrophones to utilize a sound source which approximatesthe characteristics of the human sound generator.

Product Details

Published: 01/15/1965 ISBN(s): 9781504402293 Number of Pages: 12 File Size: 1 file , 9.1 MB Product Code(s): STDWD01479