I'm looking for a .vi for sound pressure level meter (SPL)

Hi....
I'm looking for help regarding the implementation of a SPL (sound pressure level)meter using LabVIEW.....If anyone has a vi or diagram or know how to proceed with this project please tell me about it...
According to the project , I need a microfone and my laptop with LabVIEW to make the vi.
Please help
Thanks

Here's an example program:
This VI simulates the functionality of a Radio Shack Analog Sound Pressure Level (SPL) Meter. This VI requires a data acquisition board, Radio Shack SPL Meter and an RCA cable. Connect one end of the RCA cable to the SPL Meter's output, and then splice off the other end and connect it to channel 0 of the DAQ board. The connection to the DAQ board must be made differentially.
The output of the SPL meter is a raw waveform that is converted by the program into a decibel (dB) reading. The front panel shows a dB offset based on a range, just like the actual SPL meter. The front panel also displays the overall dB reading.
Attachments:
SPL.llb ‏88 KB

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Diagram or vi for Sound Pressure Level Meter (SPL)

Need help for implementing a Sound Pressure Level Meter (SPL) with LabVIEW 7.1 or 6.3....I must use a microfone and a laptop for my project.....Need diagram or ready vi ....!!!
How can I make an A,B,C Weighting Filter vi for my Sound Pressure Level Meter project....???
If there is one already made or you can give me any help please send it to me.......[email protected]
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Search the archives. A similar question about the weighting filters was posted within the past month or two, if I recall correctly. I am not aware of any ready-built VIs, but the filter specs are published (Google A-weighting).
Also be careful with the frequency response of inexpensive microphones. They can skew the results substantially if you do not have some way to measure and compenste for the response.
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I have a problem with my program. Basically, i have a chirp signal to be outputted into my DAQ and being fed to my speaker.
The microphone will sense anything coming out from the speaker, and acquire it using my DAQ.
I want to display a frequency response vs. SPL.
My method is that, I'm using FFT on the received Chirp Signal from the microphone and display its frequency response.
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2. If not, how do I convert this value of the amplitude of the FFT to SPL db?
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The FFT is a mathematical tool that outputs complex values that contains frequency and phase information. If you want to obtain the amplitude of your signal as a function of frequency, it is easier to use the "Power and Phase Spectrum" vi in the -> Signal processing -> Spectral palette.
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Triggering based on the level of the signal itself is known as an analog start trigger. Since the NI 9233 does not have analog or digital triggering, we could use another module (like a NI 9205) to start the task that the NI 9233 is in.
How Can I Trigger a NI 9233 or 9234?
http://digital.ni.com/public.nsf/allkb/4859504F14AF68DB8625721100640F26
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I'm looking for a .vi for sound pressure level meter (SPL)

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