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ASA S3.42 1992 Part1

ASA S3.42 1992 Part1

$59.58

ANSI/ASA S3.42-1992/Part 1 (2017) American National Standard Testing Hearing Aids with a Broad-Band Noise Signal

Published By Publication Date Number of Pages
ASA 1992 24
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PDF Pages PDF Title
6 A.4 Cross-spectrum analysis………………………………………………………………. 1
A.S Coherence function . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
7 0 INTRODUCTION
8 REFERENCES
1 SCOPE
2 DEFINITIONS
2.1 NSPL90
2.2 Full-on noise gain
2.3 Spectrum
2.4 Spectrum level
2.5 Auto-spectrum (power spectrum
2.6 Cross-spectrum
2. 7 Coherence
2.8 Crest factor
2.9 Spectrum analyzer
A.5.2 Coherence using synchronous analysis with a pseudo-random noise
input signal ………………………………………………………………………. 1
APPENDIX 8: SMOOTHED DAT A PRESENTATION………………………………. 1
9 2.10 RMS
2 .11 Butterworth filter
2.12 Random noise
2 .13 Pseudo-random noise
2. 14 In-situ
2 .15 Simulated in-situ
2.16dBSPL
2 .1 7 Synchronous analysis
3 NOISE INPUT SIGNAL
3.1 Noise type and crest factor
10 3.2 Spectrum
11 4 SPECTRUM ANALYSIS EQUIPMENT
5 TEST ENVIRONMENT
12 6 TEST PROCEDURES
6.1 Equalization
6.2 Hearing Aid Settings
6.3 NSPL 90
6.4 Full-on Noise Gain
6.5 Frequency Response
13 6.6 Family of Frequency Response Curves
6.7 Output Versus Input Characteristic
14 APPENDIX A: FAST FOURIER SPECTRUM ANALYSIS FOR
DEVELOPING HEARING AID FREQUENCY
RESPONSES
A.1 Introduction
15 A.2 Synchronous analysis with pseudo-random noise versus analysis with
random noise
V
vi
A.3 Auto-Spectrum analysis
A.3.1 Synchronous auto-spectrum analysis with pseudo-random noise
A.3.2 Auto-spectrum analysis with random noise
16 A.4.1 Cross-spectrum analysis with pseudo-random noise
A.4.2 Cross-spectrum analysis with random noise
A.5.1 Coherence with cross-spectrum analysis
18 A.5.3 Bias and variance in coherence measurements
A.6 Coherent and noncoherent power
19 B.1 3-point or 5-point running average
B.2 Third-octave running average method
8.3 Tenth-octave running method
20 APPENDIX C: SUMMARY OF TESTING CHARACTERISTICS TO BE
SPECIFIED

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ASA S3.42 1992 Part1
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