Difference between revisions of "TL Tool - Sound Transmission Loss Measurement"

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TL Tool - Sound Transmission Loss Measurement (view source)

Revision as of 16:54, 22 May 2026

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__TOC__
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[[File:TL_Tool_icon.png|right|180px|TL Tool|link=]]


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<span style="font-size:1.5em;font-weight:bold;">TL Tool &mdash; Sound Transmission Loss</span><br/><br/>
<span style="font-size:1.5em;font-weight:bold;">TL Tool &mdash; Sound Transmission Loss</span><br/><br/>
Standalone application for measuring the <b>Sound Transmission Loss (TL)</b> and <b>sound absorption coefficient (&alpha;)</b> of acoustic materials using a 4-microphone impedance tube.<br/><br/>
Fully integrated with <b>OROS NVGate</b> for live acquisition and automatic result display &mdash; delivered as a plug-and-play <b>.exe</b>, no installation required.
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! style="background:#0055A5;color:white;" | Value
! style="background:#0055A5;color:white;" | Value
|-
|-
| '''Delivery''' || Standalone .exe &mdash; no Python, no installation
| '''Delivery''' || [https://partnerzone.digigram.com/s/QjZaMrTZCrDQTJa download here]  version from 22/05/2026 - Beta version - download at your own risk !
|-
|-
| '''Measurement methods''' || 4-mic transfer matrix (ASTM E2611) &bull; 2-mic standing wave (ISO 10534-2)
| '''Measurement methods''' || 4-mic transfer matrix (ASTM E2611) &bull; 2-mic standing wave (ISO 10534-2)
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|-
|-
| '''Export''' || CSV (frequency, TL, &alpha;)
| '''Export''' || CSV (frequency, TL, &alpha;)
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| '''Startup time''' || ~3 seconds
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== Troubleshooting ==
{| class="wikitable" style="width:100%;"
! style="background:#6c1a1a;color:white;width:28%;" | Symptom
! style="background:#6c1a1a;color:white;width:36%;" | Likely cause
! style="background:#6c1a1a;color:white;" | Solution
|-
| NVGate not connected || Analyzer off or Ethernet disconnected || Check Ethernet cable and NVGate status
|-
| Missing FRF data || Channels not configured || Click <b>Configure NVGate</b>, then re-run
|-
| TL values all zero or NaN || Incorrect tube geometry || Check x1&ndash;x4 positions and tube diameter
|-
| Negative TL values || No phase calibration || Run phase calibration in Acquisition tab
|-
| Frequency range too narrow || Microphone spacing too small || Increase x2&minus;x1 or x4&minus;x3 spacing
|-
| NVGate wrong octave resolution || Previous window reused || Fixed: each resolution uses a dedicated window
|}


== See Also ==
== See Also ==
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* ISO 9613-1 &mdash; ''Attenuation of sound during propagation outdoors &mdash; Calculation of the absorption of sound by the atmosphere''
* ISO 9613-1 &mdash; ''Attenuation of sound during propagation outdoors &mdash; Calculation of the absorption of sound by the atmosphere''
* ISO 11654 &mdash; ''Sound absorbers for use in buildings &mdash; Rating of sound absorption''
* ISO 11654 &mdash; ''Sound absorbers for use in buildings &mdash; Rating of sound absorption''
* [https://www.bksv.com/media/doc/bv0059.pdf Br&uuml;el &amp; Kj&aelig;r BV0059 &mdash; Measuring Sound Absorption Coefficient]
* Miki Y. (1990) &mdash; ''Acoustical properties of porous materials &mdash; modifications of Delany-Bazley models''
* Miki Y. (1990) &mdash; ''Acoustical properties of porous materials &mdash; modifications of Delany-Bazley models''
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