Table of Contents

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 induction-loop<br>&nbsp;&nbsp;&nbsp;system<br>6 Meters and test signals<br>7 Magnetic background noise level of the installation site<br>8 Characteristics to be specified, methods of measurement<br>&nbsp;&nbsp;&nbsp;and requirements<br>9 Small-volume systems<br>10 Setting up (commissioning) the system<br>Annex A (informative) - Systems for small useful magnetic<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;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 of audio-frequency<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;induction-loop systems<br>Annex F (informative) - Effects of metal in the building structure<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;on the magnetic field<br>Annex G (informative) - Calibration of field-strength meters<br>Annex H (informative) - Effect of the aspect ratio of the loop on<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;the magnetic field strength<br>Annex I (informative) - Overspill of magnetic field from an<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;induction-loop system<br>Bibliography<br>Annex ZA (normative) - Normative references to<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;international publications with their<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;corresponding European publications

Abstract

Defines requirements for the field strength in audio-frequency induction loops for hearing aid purposes, which will give adequate signal-to-noise ratio without overloading the hearing aid.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	British Standards Institution
Pages
ISBN
Committee	EPL/29