2. www.univox.eu Conny Andersson Standards Standards IEC 60118-4 Sound examples Conny.Andersson@edin.se

3. www.univox.eu Reverberation time = 2 sec Speaker @ 4m distance Babble noise (other speakers) Output from a Hearing Aid (artificial ear) Reverberation time = 2 sec Speaker @ 4m distance Babble noise (other speakers) Output from a Hearing Aid (artificial ear)

4. www.univox.eu Harmonized world wide Harmonized world wide Hearing Instrument (HI) Hearing Instrument (HI) Hearing Loop system Hearing Loop system Harmonized world wide Harmonized world wide Hearing Instrument (HI) Hearing Instrument (HI) Hearing Loop system Hearing Loop system American National Standard Institute

5. www.univox.eu Magnetic Field Strength = 400mA/m. Relates directly to the output level of the Hearing Instrument Coverage area/space (sitting and standing), +-3dB Magnetic Field Strength = 400mA/m. Relates directly to the output level of the Hearing Instrument Coverage area/space (sitting and standing), +-3dB

6. www.univox.eu Level: 400mA/m Fluctuation: within +-3dB Level: 400mA/m Fluctuation: within +-3dB

7. www.univox.eu (This slide contains the notes for the previous slide)

8. www.univox.eu High frequency damping or metal loss is increased as a function of the distance to the loop wire. It cannot be fully compensated by the loop amplifier. It can be compensated by the loop figuration. High frequency damping or metal loss is increased as a function of the distance to the loop wire. It cannot be fully compensated by the loop amplifier. It can be compensated by the loop figuration.

9. www.univox.eu No frequency limitations 9 seconds 100 200 300 500 1k 2k 3k 5k Hz

10. www.univox.eu High frequency loss from 1kHz 9 seconds 100 200 300 500 1k 2k 3k 5k Hz

11. www.univox.eu High frequency loss from 500Hz 9 seconds 100 200 300 500 1k 2k 3k 5k Hz

12. www.univox.eu No frequency limitations 9 seconds 100 200 300 500 1k 2k 3k 5k Hz

13. www.univox.eu Background noise (hum) from electrical appliances creates noise directly into the Hearing Instrument Standard: less than -32dBA (-47dBA) Standard: less than -32dBA (-47dBA) Level, Magnetic Field Strength 400mA/m Background noise (hum) from electrical appliances creates noise directly into the Hearing Instrument Standard: less than -32dBA (-47dBA) Standard: less than -32dBA (-47dBA) Level, Magnetic Field Strength 400mA/m

14. www.univox.eu High background noise: -12dBA Tiresome High background noise: -12dBA Tiresome

15. www.univox.eu Low Field Strength: -12dB (100mA/m) Very low speech intelligibility Low Field Strength: -12dB (100mA/m) Very low speech intelligibility

16. www.univox.eu Accepted Field Strength: 0dB (400mA/m) Enhanced speech intelligibility Accepted Field Strength: 0dB (400mA/m) Enhanced speech intelligibility

17. www.univox.eu Accepted Field Strength: +3dB (560mA/m) Further enhanced speech intelligibility Accepted Field Strength: +3dB (560mA/m) Further enhanced speech intelligibility

18. www.univox.eu Correct Field Strength: 0dB (400mA/m) Noise complies to the standard, -32dBA Correct Field Strength: 0dB (400mA/m) Noise complies to the standard, -32dBA

19. www.univox.eu High Field Strength: +3dB (560mA/m) Noise complies to -47dBA High Field Strength: +3dB (560mA/m) Noise complies to -47dBA

20. www.univox.eu Systems that sounds “noisy” is often a reflection of a weak hearing loop amplifier. Loop systems could often easily be updated to comply with the level requirements (with increased Signal to Noise ratio and speech intelligibility). Systems that sounds “noisy” is often a reflection of a weak hearing loop amplifier. Loop systems could often easily be updated to comply with the level requirements (with increased Signal to Noise ratio and speech intelligibility).

21. www.univox.eu Follow the international standard Do not trust the manufacturers coverage area as they are highly overstated for practical installations. Trust real measurements. A hearing instrument cannot be used to certify a hearing loop system. Follow the international standard Do not trust the manufacturers coverage area as they are highly overstated for practical installations. Trust real measurements. A hearing instrument cannot be used to certify a hearing loop system.

22. www.univox.eu Conny.Andersson@edin.se