Problems with the use of variables at the time of the SV - Loudness.vi

Hello

I'm rather new to Labview and will have questions, get my Time-Varying Loudness calcuations out correctly. Attached is my current VI and a .csv file of my data set (calibrated in PA. sampling frequency = 50 kHz for 5 seconds). It does not produce what I expected when I run the VI. Here are my questions:

Time-Varying Loudness:

(1) what are the signals so much? There are hundreds of lines, but I only expect one.

(2) why my category axis are not a range from 1 to 24 years as bark should be?

1/3 octave Band Analsysis:

(1) why is it incorrect? Them should not be a linear increase the frequency...

Data on the one hand be hurry and make a squeek. It is a transient noise that happens about 2 seconds. But, how could I go do a waterfall (Time (s), Frequency (Hz), Amplidtude (sones)) of this signal? Is there an easy way? or do I have to do all three signals and add to make a parcel?

Thank you very much for your help! Let me know if you need more infromation,

-Troy

p.s. I have included a picture of the results as well.

Hi Troy,

(1) the SV specific volume VI 'chunks' given in blocks of 2 ms and returns then these as individual plots specific Loudness vs. Sone.  The colored lines that you see in your chart are representative of the 2 500 2 periods of time ms in your acquisition of five seconds.  Each of these plots contains 241 points, however they are ten sample "gradually", one for each sone.  The digital filter buffer takes a bit to fill and kick in properly, however, so you can give your first rows (0-. 02 seconds or more) scrutiny before using them - you can see a number of unexpected zeros around the lower sones.

2) since you use a chart, the x-axis will be increments every race following (the previous data is stored.)  If you only want to display the most recent data, I would recommend switching to a chart, which is found in the chart controls palette.  Also, see above (#1) why the x axis are longer than 24 points.

(3) remember that dB is a unitless measure and cannot be used in reference to another value. A typical reference for sound is 20 uPa, but you will probably need even out your data entry and determine/set dB reference.  You can take a look at the voltage from the snout to the Cloaca EU.vi scale (EU means equalized units) and from the snout to the Cloaca Set dB reference.vi.  In your case, I think the plot of Octave shows your dB from a default value of 1.  The values should be accurate with respect to the other, but you must provide a reference value to calibrate the scale.

(4) I think that this VI is a good example how to do to create a cascade:

Display cascading for Octave (DAQmx)

http://zone.NI.com/DevZone/CDA/EPD/p/ID/5562

You will need to break up of your waveform into pieces, just like the specific volume VI, but the basic concept is roughly the same (take piece of waveform, take octave measure of the piece, add octave output measure cluster to cluster table, repeat for the rest of the waveform display)

Phew!  It was a bit of information.  Let me know if this makes sense and don't be intimidated by the detail and/or unknown functions or methods - you're definitely on the right track, or to ask it to at least the right questions.

Tags: NI Software

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