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之前在论坛上看到有朋友对修改VL中基准声压不熟悉（主要是一些做水声的朋友），其实这部分资料在OLH里面有很明确讲解的，今天我把OLH里面关于修改基准声压的资料贴上来，供大家参考。
How to Change the Reference Pressure dBValue LMS Virtual.Lab allows you tochange the reference sound pressure level of (the default is 20 micropascals)used to calculate dB values. The reference sound pressure level is set in the dB_scale file in the VLinstallation files. This reference value can be changed manually. To modifythis value, go to the <Path toInstallation>/<OS Type>/reffiles/ dB_scalefile e.g.C:\Program Files\ LMS\LMS Virtual.Lab 12\win_b64\reffiles\dB_scale. Right-clickthedB_scale file as shown in the image below:
Select the option Open from itscontextual menu and in the Open With dialog box, select WordPad as shown in theimage below:
Click the OK button to close the dialog box. The dB_scale – WordPad file opens. Inthis file, each field is separated by a tab. There are five columns such as PHYSICALTYPE, MAGNITUDE, TYPE, DBFACTOR andDBREFERENCE. To change thereference pressure dB value, go to main menu Editfile:///C:/Users/DELL/AppData/Local/Temp/msohtmlclip1/01/clip_image001.gif Find or press the Ctrl+F button on the keyboard. In the Find what field, type pressure and click on the Find Next button. Search forthePressure as the Physical Type and change the DBREFERENCE value as per yourequirement which is shown in the image below:
By default, the DBREFERENCE value for pressureis 0.00002 (20 micropascals)which is for standard reference sound pressure level air. You can change the DBFACTOR and the DBREFERENCE values of otherPhysical Types. The consequences of changing the DBREFERENCE of Physical Type Pressure are, · This changed DBREFERENCE value will applyto all the data which are having the same unit in VL. · Any changes youmade to the dB_scale file are undone when a new VL version is installed. · Changes you do inone installation will apply for all users that use the same installation.
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发表于 2015-4-2 22:26
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