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www.univox.euwww.univox.uswww.edin.se univox Loop Systems, since 1965.

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Presentation on theme: "www.univox.euwww.univox.uswww.edin.se univox Loop Systems, since 1965."— Presentation transcript:

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2 univox Loop Systems, since 1965

3 Overspill (energy/space wasted leakage) Head tilt problem (directivity)‏ Acoustic and Inductive feedback/interference Metallic influence/interference Variable field - level / frequency drop in middle area Needs experienced expertise for planning

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8 Tilt angle – conventional loop

9 -3dB ‏ 0dB=full level Silence! Vertical field Silence!

10 -3dB ‏ 0dB=full level full level Vertical AND Horizontal Field

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12 SLS-XF, second generation One unit, 2 matched stages and built-in SLS-filter One unit, 2 matched stages and built-in SLS-filter Increased internal high frequency range kHz Increased internal high frequency range kHz Fully matched output stages and filter Fully matched output stages and filter Super safe technology Super safe technology 12 Power transistor of each 25A current capability 12 Power transistor of each 25A current capability Increased output voltage: 30Volt – 50Volt Increased output voltage: 30Volt – 50Volt Built-in auto-SCART-function Built-in auto-SCART-function

13 univox Loop Systems, since 1965

14 Background noise less than -47dBA, -32dBA Frequency range Hz Field variation +-3dB Level 0dB = 400mA/m (clarity and less noise) Specifies the Field strength

15 Loop Amplifier can NOT be IEC approved IEC Specifies ONLY the Field Strength Do NOT trust the stated coverage area for Loop Amplifier Trust the written certificate from the installer Compare the output current and/or power consumption for Loop Amp Measurement report - certificate Level = 400mA/m for speech (clarity, no noise)

16 Field Strength -12dB (16-times less power below standard) Noise -12dB (20 dB higher than the standard)

17 Field Strength 0dB=400mA/m Noise -12dB

18 Field Strength 0dB Noise -32dB

19 Do NOT trust stated coverage area! Certify according to IEC LEVEL = 400mA/m (0dB) Do NOT certify using a Hearing Aid.

20 univox Loop Systems, since 1965

21 Distortion Echo Reverberation Absorption Noise> human speech noise Frequency limitation Sound in air has problems:

22 2 sec reverberation time, large building- church Speaker 4m Babble noise (other speakers) Direct from a Hearing Aid (artificial ear)

23 Difficult to filter out reverberation Impossible to filter out speech from speech Solution: shorter microphone distance (wireless system)‏

24 IR – infrared No overspill Different frequencies – partly standardized Sensitive to direct sun light Radio and Infra Red (IR) High current consumption compared to HA ( mA) Not Compatibility with Hearing Aid (neck loop) Separat unit outside HA No world-wide standard (2.4GHz streamers, not standardized)

25 Built-in reciever in HA Zero Current consumption, T-coil World Wide Standard

26 Invisible Economical = No extra costly unit No additional knowledge No channel switching, level setting No changing battery/charging hassle Economical = No extra unit+Zero Current Long life = system is not tampered with Individual fitted hearing aid Compatible everywhere-World Wide

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