
A query to the selected Ltas object.
the mean value (in dB) within a specified frequency range.
The mean value between the frequencies f_{1} and f_{2} is defined as
1/(f_{2}  f_{1}) ∫_{f1}^{f2} df x(f) 
where x(f) is the LTAS as a function of frequency, expressed in dB. For our discrete Ltas object, this mean is approximated by
1/n ∑_{i=m..m+n1} x_{i} 
where n is the number of band centres between f_{1} and f_{2}.
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