AS IEC 61669-2003

1 - AS IEC 61669-2003 ELECTROACOUSTICS-EQUIPMENT FOR THE MEASUREMENT FO REAL-EAR ACOUSTICAL CHARACTERISTICS OF HEARING AIDS
4 - PREFACE
5 - CONTENTS
7 - INTRODUCTION
9 - 1 Scope
9 - 2 Normative references
9 - 3 Terms and definitions
9 - 3.1 test signal
10 - 3.2 subject
10 - 3.3 subject reference point
10 - 3.4 test axis
10 - 3.5 working distance
10 - 3.6 sound pressure level (SPL)
10 - 3.7 band sound pressure level
10 - 3.8 test signal level
10 - 3.9 equalization
10 - 3.10 reference microphone controlling microphone
10 - 3.11 sound inlet
11 - 3.12 field reference point
11 - 3.13 probe microphone
11 - 3.14 test ear
11 - 3.15 measurement point
11 - 3.16 test signal type
11 - 3.17 concurrent equalization real time equalization
11 - 3.18 stored equalization
11 - 3.19 substitution method
11 - 3.20 modified pressure method
11 - 3.21 differential comparison
12 - 3.22 real-ear unaided response (REUR)
12 - 3.23 real-ear unaided gain (REUG)
12 - 3.24 real-ear occluded response (REOR)
12 - 3.25 real-ear occluded gain (REOG)
12 - 3.26 real-ear aided response (REAR)
12 - 3.27 real-ear aided gain (REAG)
12 - 3.28 real-ear insertion gain (REIG)
12 - 3.29 curve
13 - 3.30 crest factor
13 - 3.31 uncertainty of measurement
13 - 3.32 combined standard uncertainty of a measurement
13 - 3.33 expanded uncertainty of a measurement
13 - 3.34 coverage factor
13 - 4 Limitations
14 - 5 General requirements
14 - 5.1 General
14 - 5.2 Safety requirements
14 - 5.3 Warm-up time
14 - 5.4 Environmental conditions
14 - 5.5 Power supply variation
15 - 5.6 Immunity to power and radio frequency fields
15 - 5.7 Interface connections
15 - 6 Test signal characteristics
15 - 6.1 Test signal
15 - 6.2 Sound source
15 - 6.3 Test signal level
15 - 6.4 Test signal level indication
15 - 6.5 Equalization
16 - 6.6 Frequency
16 - 6.7 Harmonic distortion
16 - 6.8 Equipment for automatic sweep frequency recording
16 - 6.9 Integrity of test signal
16 - 7 Sound measurement
16 - 7.1 Probe microphone measurement
16 - 7.2 Noise floor of probe microphone measurement
16 - 7.3 Attenuation of probe microphone to external signals
17 - 8 Data acquisition, analysis and presentation
17 - 8.1 General
17 - 8.2 Output indication
17 - 8.3 Graphical printout
17 - 9 Calibration
17 - 10 Demonstration of conformity with specifications and test procedures
17 - 10.1 General
18 - 10.2 Environmental conditions and power supply variation
18 - 10.3 Immunity to power and radio frequency fields
18 - 10.4 Test signals
18 - 10.4.1 Signal accuracy
18 - 10.4.2 Accuracy of control
19 - 10.5 Sound measurement
19 - 10.5.1 Measurement accuracy
19 - 10.5.2 Noise floor of probe microphone measurement
19 - 10.5.3 Attenuation of probe microphone to external signals
19 - 11 Maximum permitted expanded uncertainty of measurements
20 - 12 Marking and instruction manual
20 - 12.1 Marking
20 - 12.2 Software version
20 - 12.3 Instruction manual
21 - Bibliography