Log 8 hours sound pressure data

Hi all,
I want to log an 8 hour signal from a pcb mic. with the sound and vibration assistant(signal express). I want to acquire at 50KHz, but i think there wi'll be too much data. Is there a WAY to reduce that data?
thank you
pollon
Solved!
Go to Solution.

HI Pollon,
what about averaging the signal in a certain amount of time, to reduce the number of points you have to save?
If for example you're acquiring at 50 Hz, you can save the mean value for every 50 points, and in that case, you're saving one point each second.
Hope it helps,
have a nice day!

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How to generate .wav files from sound pressure data

Hi,
I have sound pressure data (as dB values) vs frequency data.
How can I create a playable .wav file based on above?
Note: I do NOT have sound pressure vs time data
I am working in LV 7.1 FDS on Win2000.
If really required, I can incorporate VIs from sound and vibration toolkit (version 1.0).
However, I would prefer a solution that does not need me to do that.
Thanks in anticipation,
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Gurdas Singh
PhD. Candidate | Civil Engineering | NCSU.edu

All,
With some help from NI-India, we managed to build a nice sound player and .wav saving utility.
I have attached the VI sent by NI-India. The key component which was missing in my VI was "resample waveform".
Note: For some reason, I could not use the attached VI to generate sound but did use the concept to succesfully read my sound pressure data and output it to the speaker (and also save it as .wav file tha can be played on Windows Media Player). Also note that I am now generating sound from sound pressure vs time data. I have not tried generating sound from sound pressure vs frequency data.
I would love to have the following answered:
1) What data does the sound write VI expect? Is it Sound Pressure values? What units (N/m2 or dB or dBA)? I think it expects sound pressure data and the units are not relevant. Reason being my next question.
2) I found that until I mutliply the sound pressure data by a very large number say 10e7, the sound is hardly audible (even when volume was programmatically set to max. i.e. 65535). The sound QUALITY does not change when I change this multiplier.
2.a) Does that mean its only the relative difference between wave data points that affects sound quality? If yes, then I believe the sound pressure data can be in any units.
2.b) Is it expected to use this huge multiplier OR did I do something without really knowing what it meant?
Thanks,
Gurdas
Gurdas Singh
PhD. Candidate | Civil Engineering | NCSU.edu
Attachments:
Sound from FFT (LV 8).vi ‏165 KB

Sound pressure reporting

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We are new (actually, still evaluating) LabView customers. I know nothing about Labview, and less about the technical intracacies of the project that I have to complete. Basically, what I need to do is acquire and capture up to three streams of sound pressure data using B&K 4944-A sound pressure mics attached to an NI 9233. I think we can do this with SignalExpress and the S&V Assistant. In essence we are replacing three B&K 2209 sound meters with B&K 4136 pressure mics capturing one or more precussive sound events. The new hardware is already purchased. We are trying to get the capture and reporting going.
My need is:
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Hello,
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
If you do not want to buy another module, you could try post-processing the data to ignore any data that comes in before this level.
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Sound pressure signal as input

I want to use a function SV Time-Varying Loudness in the Sound and vibration suite. The output of this function is exactly what I require for my speech analysis.
I have a speech sample recorded from the microphone obviously a voltage signal. This function requires a sound pressure signal.
The voltage signal would be proportional to the sound pressure signal right? How do I convert this voltage signal to the sound pressure signal (Pa).
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Your microphone should have calibration tables to relate the output voltage to an audio quantity like dB or perhaps even Pa.
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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.
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SPL.llb ‏88 KB

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Hi David,
If you want to enable the enhanced alias filter, you can use a DAQmx channel property node. I would recommend placing a DAQmx Channel property node on the block diagram and then going to Analog Input » General Properties » Advanced » Enhanced Alias Rejection Enable. See if that works and let me know.
Jake H | Applications Engineer | National Instruments
Attachments:
Enhanced Alias Rejection.png ‏3 KB

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Log 8 hours sound pressure data

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