Convert PCM to dB/ dB SPL

Hello,
I am aquaring a signal from a referenced microphone with "Sound Input Read.vi". i get a PCM data (doubl) between -1 and 1. I would like to know how to convert this data to dB SPL
the main prupose of the vi is to get the volume generated by a speaker. I would like to have the volume in dB SPL.
Is there someone who know how to do that ?
thanks in advance

Hello Redzouz,
I think this thread could guide you in the right direction, please refer to the link below:
http://forums.ni.com/t5/LabVIEW/Calculating-dB-in-sound-pressure-level/td-p/871078
Best regards,
Daniel Cabezas
Applications Engineering
National Instruments
www.ni.com/support

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Hi,
welcome to the beautiful world of open source :-) By the way, I have not seen anybody programming in Perl for a long time.
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G.

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Do you have previously authored DVDs that need rework? Do you want to add menus with greater impact and functionality? Do you want to add some additional program or supplemental material? Does a client want their product demo DVD to be updated to reflect the capabilities of the new and improved version, but the source files no longer exist? Using Adobe Encore DVD and a freeware utility called DVD Decrypter (DVDD), you can accomplish this quickly and easily.
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Guide © Jeff Bellune 2005

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OK it works now.
in fact I was wrong, the solution was within VLC. you just have to tell it that you are using the digital optical output and the Mac does the passthrough of DTS or Dolby Digital.
just go to pref pane within VLC, then audio then check the box "use s/pdif if available"
in fact I first tried what was here
http://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quic ktime/
but as it still did not worked, I kept on searching and then found the solution. Then I undid the Terminal comandes in the link above and found out that it still worked.
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TIPS Gathered To Date:
1) S/V toolset has IEC 1260 compliant filters, BUT...
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3) LabVIEW does not support drag'n'drop operations on files. Instead, the recommended technique is to use multiple "Browse to/ Navigation/ File Open" panels to allow LV to open the user's desired qty of .wav files simultaneously;
Thanks for any tips!

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Convert PCM to dB/ dB SPL

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