ISO/TS TECHNICAL SPECIFICATION 9241-126 First edition 2019-12 Ergonomics of human-system interaction - Part 126: Guidance on the presentation of auditory information Reference number IS0/TS9241-126:2019(E) ISO @IS02019 IS0/TS9241-126:2019(E) COPYRIGHTPROTECTEDDOCUMENT IS02019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or IsO's member body in the country of the requester: ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122.749 0111 Fax: +41 22 749 09 47 Email:copyright@iso.org Website: www.iso.org Published in Switzerland ii IS02019-Allrights reserved IS0/TS9241-126:2019(E) Contents Page Foreword vi Introduction vii 1 Scope .1 2 Normativereferences .1 3 Terms and definitions .1 4 Application. .3 4.1 Accessibility 3 4.2 Applying the recommendations in this document. 4 5 Appropriate usage. 4 5.1 Visual system unavailability 4 5.2 Inadequate orexcessive light 4 5.3 Inability tomaintainvisual attention 4 5.4 Message brevity and simplicity 4 5.5 Event-based messages 5 5.6 Messages requiringimmediateaction 5 5.7 Messages requiring verbal response. 5 5.8 ５５ Permanence ofmessagerelevance 5.9 Attention capture. 5.10 Muting sound. 5 Auditorypresentation 55 6 6.1 General. 6.1.1 Auditory channel overload 555 6.1.2 Information conciseness. 6.1.3 Avoidextremedimensions 6.1.4 Monaural option 6 6.1.5 Ease of learning. 6 6.1.6 Signal invariance 6 6.1.7 Signal similarity 6 6.1.8 Two-stage signal usage 6 6.1.9 Logical sequencing... 6 6.1.10 Supporting shorttermmemory 6 6.1.11 Cross-cultural sounds 7 6.1.12 Representative sounds. 7 6.1.13 Representative sound usage 7 6.2 Detectability in noisy environments 7 6.2.1 Signal distinctiveness. 7 6.2.2 Change signal frequency 7 6.2.3 Signal duration in noisy environments 7 Auditory dimensions 7 7.1 Frequency 7.1.1 Absolutepitchidentification 7 7.1.2 Temporal proximityforpitch comparison 7 7.1.3 Similarity for pitch comparison. 7 7.1.4 Minimumdifferenceforpitchcomparison 8 7.1.5 Frequencyrangeforpitchidentification 8 7.1.6 Frequencyrangefor mostaccuratepitch discrimination 8 7.1.7 Harmonicityforpitchidentification 8 7.1.8 Harmonictonesforpitchdiscriminationtasks 8 7.1.9 Long-distance sound 8 7.1.10 Obstructed sound 8 7.2 Intensity 8 7.2.1 Avoid distortion 8 @ IS0 2019 - All rights reserved iii