univox loop systems, since 1965
TRANSCRIPT
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SLS - Loop systemsunivox Loop Systems, since 1965
www.univox.eu
www.univox.us www.edin.se
Conventional loops: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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Conventional Loops = overspill
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SLS = no overspill
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Conventional Loop - overspill
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SLS – No overspill
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Tilt angle – conventional loop
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-3dB (@45°)-3dB (@45°)
Conventional loops - tilt angel
0dB=full level
Silence!
Vertical field
Silence!
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-3dB (@45°)-3dB (@45°)
New Loops- both directions
0dB=full level
full levelfull level
Vertical AND Horizontal Field
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SLS – No overspill
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SLS-XF, second generation
• One unit, 2 matched stages and built-in SLS-filter
• Increased internal high frequency range 10-16 kHz
• Fully matched output stages and filter
• Super safe technology
• 12 Power transistor of each 25A current capability
• Increased output voltage: 30Volt – 50Volt
• Built-in auto-SCART-function
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IEC 60118-4 standard
univox Loop Systems, since 1965
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IEC 60118-4, Scope + Facts
Background noise less than -47dBA, -32dBA
Frequency range 100-5000HzField variation +-3dBLevel 0dB = 400mA/m (clarity and less
noise)
Specifies the Field strength
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IEC 60118-4, CommentsLoop Amplifier can NOT be IEC
60118-4 approved IEC 60118-4 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 - certificateLevel = 400mA/m for speech
(clarity, no noise)
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High Noise, Low field strength
Field Strength -12dB (16-times less power below standard)
Noise -12dB (20 dB higher than the standard)
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Field comply but NoisyField Strength
0dB=400mA/mNoise -12dB
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Minimum IEC-standard!Field Strength
0dBNoise -32dB
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Wireless system needed!
Do NOT trust stated coverage area!
Certify according to IEC
LEVEL = 400mA/m (0dB)Do NOT certify using a Hearing Aid.
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Why a Loop System?
univox Loop Systems, since 1965
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Why a Loop System?
DistortionEchoReverberationAbsorptionNoise> human speech noiseFrequency limitation
Sound in air has problems:
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Hearing Aid, Mic-input
2 sec reverberation time, large building-church
Speaker 4mBabble noise (other speakers)Direct from a Hearing Aid (artificial
ear)
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Wireless system needed!
Difficult to filter out reverberation
Impossible to filter out speech from speech
Solution: shorter microphone distance (wireless system)
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IR – Radio - Loops
IR – infrared No overspillDifferent frequencies – partly
standardizedSensitive to direct sun light
Radio and Infra Red (IR) High current consumption compared to
HA (0.3-1.5mA) Not Compatibility with Hearing Aid (neck
loop) Separat unit outside HA No world-wide standard
(2.4GHz streamers, not standardized)
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Loop System – fundamentals
Built-in reciever in HA
Zero Current consumption, T-coil
World Wide Standard
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Loop Systems – users view
InvisibleEconomical = No extra costly unitNo additional knowledgeNo channel switching, level settingNo changing battery/charging hassleEconomical = No extra unit+Zero
CurrentLong life = system is not tampered
withIndividual fitted hearing aidCompatible everywhere-World Wide
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Homogenous sound