html5-img
1 / 27

SLS - Loop systems

SLS - Loop systems. univox Loop Systems, since 1965. 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

aysel
Download Presentation

SLS - Loop systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SLS - Loop systems univox Loop Systems, since 1965

  2. 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

  3. Conventional Loops = overspill

  4. SLS = no overspill

  5. Conventional Loop - overspill

  6. SLS – No overspill

  7. Tiltangle – conventional loop

  8. Conventional loops - tilt angel -3dB (@45°)‏ -3dB (@45°)‏ Vertical field 0dB=full level Silence! Silence!

  9. New Loops- both directions -3dB (@45°)‏ -3dB (@45°)‏ Vertical AND Horizontal Field 0dB=full level full level full level

  10. SLS – No overspill

  11. 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

  12. IEC 60118-4 standard univox Loop Systems, since 1965

  13. IEC 60118-4, Scope + Facts Specifies the Field strength • Background noise less than -47dBA, -32dBA • Frequency range 100-5000Hz • Field variation +-3dB • Level 0dB = 400mA/m (clarity and less noise)

  14. IEC 60118-4, Comments • Loop 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 - certificate • Level = 400mA/m for speech (clarity, no noise)

  15. High Noise, Low field strength FieldStrength -12dB (16-times less power below standard) Noise -12dB (20 dB higherthan the standard)

  16. Field comply but Noisy Field Strength 0dB=400mA/m Noise -12dB

  17. Minimum IEC-standard! Field Strength 0dB Noise -32dB

  18. Wirelesssystem needed! • Do NOT trust statedcoverage area! • Certifyaccording to IEC • LEVEL = 400mA/m (0dB) • Do NOT certifyusing a Hearing Aid.

  19. Why a Loop System? univox Loop Systems, since 1965

  20. Why a Loop System? Sound in air has problems: • Distortion • Echo • Reverberation • Absorption • Noise> human speech noise • Frequency limitation

  21. Hearing Aid, Mic-input • 2 secreverberation time, largebuilding-church • Speaker 4m • Babblenoise (other speakers) • Direct from a Hearing Aid (artificialear)

  22. Wirelesssystem needed! • Difficult to filter out reverberation • Impossible to filter out speech from speech • Solution: shorter microphone distance (wireless system)‏

  23. IR – Radio - Loops • IR – infrared • No overspill • Different frequencies – partly standardized • Sensitive 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)

  24. Loop System – fundamentals • Built-in reciever in HA • Zero Current consumption, T-coil • World Wide Standard

  25. Loop Systems – usersview • Invisible • Economical = No extra costlyunit • No additionalknowledge • No channelswitching, level setting • No changingbattery/charginghassle • Economical = No extra unit+ZeroCurrent • Long life = system is not tampered with • Individualfitted hearing aid • Compatibleeverywhere-World Wide

  26. Homogenous sound

  27. Thank you for your attention! Conny.Andersson@edin.se

More Related