ELECTROACOUSTICS - HEARING AIDS - PART 4: INDUCTION-LOOP SYSTEMS FOR HEARING AID PURPOSES - SYSTEM PERFORMANCE REQUIREMENTS
International Electrotechnical Committee
FOREWORD<br>INTRODUCTION<br>1 Scope<br>2 Normative references<br>3 Terms and definitions<br>4 General<br>5 Using components of a sound system in an<br> induction-loop system<br>6 Meters and test signals<br>7 Magnetic background noise level of the<br> installation site<br>8 Characteristics to be specified, methods<br> of measurement and requirements<br>9 Small-volume systems<br>10 Setting up (commissioning) the system<br>Annex A (informative) - Systems for small useful<br> magnetic field volumes<br>Annex B (informative) - Measuring equipment<br>Annex C (informative) - Provision of information<br>Annex D (informative) - Measuring speech signals<br>Annex E (informative) - Basic theory and practice<br> of audio-frequency induction-loop systems<br>Annex F (informative) - Effects of metal in the<br> building structure on the magnetic field<br>Annex G (informative) - Calibration of field-strength<br> meters<br>Annex H (informative) - Effect of the aspect ratio<br> of the loop on the magnetic field strength<br>Annex I (informative) - Overspill of magnetic field from an<br> induction-loop system<br>Bibliography
Pertains to audio-frequency induction-loop systems producing an alternating magnetic field at audio frequencies and intended to provide an input signal for hearing aids operating with an induction pick-up coil (telecoil).
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | TC 29 |
