{"id":230685,"date":"2024-10-19T15:00:44","date_gmt":"2024-10-19T15:00:44","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-60118-152012\/"},"modified":"2024-10-25T09:17:04","modified_gmt":"2024-10-25T09:17:04","slug":"bs-en-60118-152012","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-60118-152012\/","title":{"rendered":"BS EN 60118-15:2012"},"content":{"rendered":"

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<\/sup> 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.<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
6<\/td>\nEnglish
CONTENTS <\/td>\n<\/tr>\n
8<\/td>\nINTRODUCTION <\/td>\n<\/tr>\n
9<\/td>\n1 Scope
2 Normative references <\/td>\n<\/tr>\n
10<\/td>\n3 Terms and definitions <\/td>\n<\/tr>\n
11<\/td>\n4 Limitations
5 Setup
5.1 System overview <\/td>\n<\/tr>\n
13<\/td>\n5.2 Estimated insertion gain
Figures
Figure\u00a01 \u2013 Measurement setup for the estimated insertion gain <\/td>\n<\/tr>\n
14<\/td>\n5.3 Coupler gain
6 Test equipment
6.1 Acoustical requirements
Figure\u00a02 \u2013 Measurement setup for the coupler gain <\/td>\n<\/tr>\n
15<\/td>\n6.2 Test signal
6.2.1 Specification of ISTS <\/td>\n<\/tr>\n
16<\/td>\n6.2.2 Shaping of the test signal for determining the EIG
Figure\u00a03 \u2013 ISTS 30th, 65th, 99th percentiles and LTASS in dB versus one-third-octave bands
Tables
Table\u00a01 \u2013 ISTS 30th, 65th, 99th percentiles and LTASS in dB at one-third-octave bands <\/td>\n<\/tr>\n
17<\/td>\n6.3 Earphone coupler and attachments
6.3.1 Estimated insertion gain
6.3.2 Coupler gain
7 Test conditions
7.1 Programming of hearing aid <\/td>\n<\/tr>\n
18<\/td>\n7.2 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 <\/td>\n<\/tr>\n
19<\/td>\nFigure\u00a04 \u2013 Standard audiograms for the flat and moderately sloping group
Table\u00a02 \u2013 Standard audiograms for the flat and moderately sloping group <\/td>\n<\/tr>\n
20<\/td>\n8 Measurements and analysis
8.1 Measurements
8.1.1 General
Figure\u00a05 \u2013 Standard audiograms for the steep sloping group
Table\u00a03 \u2013 Standard audiograms for the steep sloping group <\/td>\n<\/tr>\n
21<\/td>\n8.1.2 Estimated insertion gain (EIG)
8.1.3 Coupler gain (optional for 2\u00a0cm3 coupler)
8.2 Analysis
8.2.1 General <\/td>\n<\/tr>\n
22<\/td>\nFigure\u00a06 \u2013 Overview of analysis <\/td>\n<\/tr>\n
23<\/td>\n8.2.2 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\u00a0EIG)
Figure\u00a07 \u2013 Time alignment of output signal (y) relative to the input signal (x)
Table\u00a04 \u2013 Recommended coupler correction values when using the 2\u00a0cm3 coupler <\/td>\n<\/tr>\n
24<\/td>\n8.2.5 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\u00a08 \u2013 Sectioning of recorded signals <\/td>\n<\/tr>\n
25<\/td>\n8.2.7 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) <\/td>\n<\/tr>\n
26<\/td>\n9 Data presentation
9.1 LTASS gain (LTASS EIG or LTASS coupler gain)
Figure\u00a09 \u2013 Illustration of the method for obtaining “time aligned gain”for the 65th percentile
Figure\u00a010 \u2013 LTASS gain at 3 input sound pressure levels <\/td>\n<\/tr>\n
27<\/td>\n9.2 Percentile gain (percentile EIG or percentile coupler gain)
Figure\u00a011 \u2013 LTASS gain at 3 input levels relative the LTASS gain at 65\u00a0dB input sound pressure level
Figure\u00a012 \u2013 Percentile gain for 3 percentiles and corresponding LTASS gain <\/td>\n<\/tr>\n
28<\/td>\n9.3 Interpretation of gain views
9.3.1 LTASS gain view
9.3.2 Percentile gain view <\/td>\n<\/tr>\n
29<\/td>\n9.4 Mandatory data <\/td>\n<\/tr>\n
30<\/td>\nAnnex A (informative) International speech test signal (ISTS) <\/td>\n<\/tr>\n
33<\/td>\nFigure\u00a0A.1 \u2013 ISTS level distributions for five third-octave bands as measured from 50\u00a0% overlapping 125\u00a0ms sections of the ISTS <\/td>\n<\/tr>\n
34<\/td>\nBibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Electroacoustics. Hearing aids – Methods for characterising signal processing in hearing aids with a speech-like signal<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
BSI<\/b><\/a><\/td>\n2012<\/td>\n36<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":230688,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[270,2641],"product_tag":[],"class_list":{"0":"post-230685","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-17-140-50","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/230685","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/230688"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=230685"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=230685"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=230685"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}