IEC 60645-2:1993

FOREWORD
INTRODUCTION
Clause
1 Scope and object
2 Normative references
3 Definitions
4 General requirements
5 Minimum requirements for specific types of audiometers
6 Reference conditions for specification, testing and
   calibration of speech audiometers
7 Signal level indicator
8 Output level control for speech signals
9 Output sound-pressure level and vibratory force level
10 Frequency response
11 Harmonic distortion
12 Signal-to-noise ratio
13 Masking sound
14 Monitor earphone or loudspeaker
15 Talkback system
16 Interrupter switches
17 Marking and instruction manual
Annex A - Correction figures for free-field equivalent
          output for certain types of commonly used earphones

Specifies requirements for audiometers or parts thereof designed to provide a means of presenting speech sounds to a subject in a standardized manner for example for the measurement of speech recognition.