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SLS - Loop systemsunivox Loop Systems, since 1965

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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

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Thank you for your attention!

Conny.Andersson@edin.se