Table of Contents

 1     Scope            
 2     References  
 3     Definitions   
        3.1     Terms defined elsewhere              
        3.2     Terms defined in this Recommendation      
 4     Abbreviations and acronyms    
 5     Conventions
 6     Safe listening: Introduction      
        6.1     Background       
        6.2     Personal audio system    
 7     Damage risk criteria   
        7.1     Operational modes          
        7.2     Uncertainty in dose estimate         
 8     Measurement methods             
        8.1     Dosimetry          
 9     Sensitivity range and frequency response of headphones
10     Profiles        
11     Health communication             
       11.1     Purpose of including health communication as part of the standards for safe listening personal audio systems    
       11.2     Key recommendations for communication as part of standards for safe listening devices    
12     Ambient noise control             
       12.1     Passive attenuation of the background noise            
       12.2     Active noise reduction of background noise             
       12.3     Benefits of noise-isolating earphones         
       12.4     Safety concerns associated with noise-isolating earphones   
13     Volume control          
       13.1     Volume limiting
       13.2     Parental control              
14     Guidance on ancillary concerns             
Appendix I – Status report    
Appendix II – Dose estimation functionality for implementation in a personal audio system    
       II.1     Introduction       
       II.2     Main related standards    
       II.3     Definition of dose in the context of acoustic dosimetry            
       II.4     Weighting of different frequencies               
       II.5     Signal capture point in a personal audio system (PAS)               
       II.6     Handling of left and right channels
       II.7     Dosimeter implementation example             
       II.8     Handling of computational complexity          
       II.9     Handling of dose over days and weeks         
      II.10     Case of unknown headphone characteristics             
      II.11     Alternative audio signal capture point         
      II.12     Testing of dosimeter functionality
      II.13     Uncertainties    
Appendix III – European Standard EN 71-1 for toys    
Appendix IV – "Music" versus "noise"    
Appendix V – On stapedius muscle reflex    
Appendix VI – Consideration of recovery phase    
Appendix VII – Example of health communication    
      VII.1     Recommendations to develop warnings and cues for action messages for device interfaces    
      VII.2     Suggested flow (an example) of information as part of standards for safe listening devices    
      VII.3     Example of how the information on listening parameters can be conveyed to the user    
      VII.4     Warnings and cues for actions