angelo.farina |
|
| This is due to the fact that the file being created is ready for being copied and pasted inside a result file of the Ramsete program, which also computes the echogram in 10 octave bands. Each value being exported is the "pseudo energy", and can be converted back in dB-SPL by the formula L=10*log10(value) The A and Lin bands can be recreated easily in Excel, the LIN is just the sum of the 10 values, whilst for getting the A-weighted sum you must first multiply each "pseudo energy" value for the corresponding A-weighting factor, and then sum. These are the 10 A-weighting factors, also expressed as "pseudo-energy" 0.000114815 0.002398833 0.024547089 0.138038426 0.478630092 1 1.318256739 1.258925412 0.776247117 0.218776162 Here you can find an example of an Excel file where these computations are done, and an SPL chart is created: www.aurora-plugins.com/Public/Aurora-for-Audacity/Examples/ |
| | |
