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BS EN 60118-15:2012

BS EN 60118-15:2012

$167.15

Electroacoustics. Hearing aids – Methods for characterising signal processing in hearing aids with a speech-like signal

Published By Publication Date Number of Pages
BSI 2012 36
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IEC 60118-15:2012 specifies a test signal designed to represent normal speech, the International Speech Test Signal (ISTS), together with the procedures and the requirements for measuring the characteristics of signal processing in air-conduction hearing aids. The measurements are used to derive the estimated insertion gain (EIG). For the purposes of characterizing a hearing aid for production, supply and delivery, the procedures and requirements to derive the coupler gain on a 2 cm 3 coupler as defined in IEC 60318-5 are also specified. The purpose of this standard is to ensure that the same measurements made on a hearing aid following the procedures described, and using equipment complying with these requirements, give substantially the same results. Measurement methods that take into account the acoustic coupling of a hearing aid to the individual ear and the acoustic influence of the individual anatomical variations of an end-user on the acoustical performance of the hearing aid, known as real-ear measurements, are outside the scope of this particular standard.

PDF Catalog

PDF Pages PDF Title
6 English
CONTENTS
8 INTRODUCTION
9 1 Scope
2 Normative references
10 3 Terms and definitions
11 4 Limitations
5 Setup
5.1 System overview
13 5.2 Estimated insertion gain
Figures
Figure 1 – Measurement setup for the estimated insertion gain
14 5.3 Coupler gain
6 Test equipment
6.1 Acoustical requirements
Figure 2 – Measurement setup for the coupler gain
15 6.2 Test signal
6.2.1 Specification of ISTS
16 6.2.2 Shaping of the test signal for determining the EIG
Figure 3 – ISTS 30th, 65th, 99th percentiles and LTASS in dB versus one-third-octave bands
Tables
Table 1 – ISTS 30th, 65th, 99th percentiles and LTASS in dB at one-third-octave bands
17 6.3 Earphone coupler and attachments
6.3.1 Estimated insertion gain
6.3.2 Coupler gain
7 Test conditions
7.1 Programming of hearing aid
18 7.2 End user settings for programming
7.2.1 Hearing aid features
7.2.2 Vent selection for programming
7.2.3 Directionality
7.3 Audiograms for a typical end-user
19 Figure 4 – Standard audiograms for the flat and moderately sloping group
Table 2 – Standard audiograms for the flat and moderately sloping group
20 8 Measurements and analysis
8.1 Measurements
8.1.1 General
Figure 5 – Standard audiograms for the steep sloping group
Table 3 – Standard audiograms for the steep sloping group
21 8.1.2 Estimated insertion gain (EIG)
8.1.3 Coupler gain (optional for 2 cm3 coupler)
8.2 Analysis
8.2.1 General
22 Figure 6 – Overview of analysis
23 8.2.2 Compensating for hearing aid processing delay
8.2.3 Correction for use of 2 cm3 coupler for EIG determination
8.2.4 Calculation of the estimated insertion gain for the LTASS of the ISTS (LTASS EIG)
Figure 7 – Time alignment of output signal (y) relative to the input signal (x)
Table 4 – Recommended coupler correction values when using the 2 cm3 coupler
24 8.2.5 Calculation of the coupler gain for the LTASS of the ISTS (LTASS coupler gain) (optional)
8.2.6 Sectioning of recorded signals for percentile calculations
Figure 8 – Sectioning of recorded signals
25 8.2.7 Calculation of the EIG for the 30th, 65th and 99th percentiles of the ISTS (percentile EIG)
8.2.8 Calculation of the coupler gain for the 30th, 65th and 99th percentiles of the ISTS (Percentile coupler gain) (optional)
26 9 Data presentation
9.1 LTASS gain (LTASS EIG or LTASS coupler gain)
Figure 9 – Illustration of the method for obtaining “time aligned gain”for the 65th percentile
Figure 10 – LTASS gain at 3 input sound pressure levels
27 9.2 Percentile gain (percentile EIG or percentile coupler gain)
Figure 11 – LTASS gain at 3 input levels relative the LTASS gain at 65 dB input sound pressure level
Figure 12 – Percentile gain for 3 percentiles and corresponding LTASS gain
28 9.3 Interpretation of gain views
9.3.1 LTASS gain view
9.3.2 Percentile gain view
29 9.4 Mandatory data
30 Annex A (informative) International speech test signal (ISTS)
33 Figure A.1 – ISTS level distributions for five third-octave bands as measured from 50 % overlapping 125 ms sections of the ISTS
34 Bibliography

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BS EN 60118-15:2012
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