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Sound level options for voice analysis

I have two questions.

 

I am analysing voice signals using GRAAS microphone, NI9234, cDAQ 9178 & labview 2011.   I am trying to produce a two dimensional graph of the signal with SPL (DB)(y-axis) versus frequency (x-axis).   I noticed that the SVT sound level.vi from the sound & vibration toolkit outputs into 4 different values;

1. exponential averaging sound level (dB),

2. Leq sound level (dB),

3. running leq sound level (dB), and

4. peak sound level (dB). 

 

Which of this four should I use.

 

Is it right that I should use linear weightage for human voice analysis?

 

Thanks in advance

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