I have some confusions regarding reverberation time (RT60). I need to calculate reverberation time from a given power envelope. This is what I get. As you might see the line is curved close to zero (at top left corner) and then becomes straight. Is t-intercept equal to RT60, or do I need to extend the straight line at the top then shift the line left so that I get a straight line starting from the top left corner and then see the t-intercept. Any help would be appreciated. Thanks in advance!

I have some confusions regarding reverberation time (RT60). I need to calculate reverberation time from a given power envelope. 

This is what I get. As you might see the line is curved close to zero (at top left corner) and then becomes straight. Is t-intercept equal to RT60, or do I need to extend the straight line at the top then shift the line left so that I get a straight line starting from the top left corner and then see the t-intercept? Any help would be appreciated. Thanks in advance!

I have some confusions regarding reverberation time (T60). I need to calculate reverberation time from a given power envelope. This is what I get. As you might see the line is curved close to zero (at top left corner) and then becomes straight. Is x-intercept equal to T60, or do I need to extend the straight line at the top then shift the line left so that I get a straight line starting from the top left corner and then see the x-intercept. Any help would be appreciated. Thanks in advance!

I have some confusions regarding reverberation time (RT60). I need to calculate reverberation time from a given power envelope. This is what I get. As you might see the line is curved close to zero (at top left corner) and then becomes straight. Is t-intercept equal to RT60, or do I need to extend the straight line at the top then shift the line left so that I get a straight line starting from the top left corner and then see the t-intercept. Any help would be appreciated. Thanks in advance!