[LAD] Calculate R M S

Hi Experts. I wanna normalize my sound stream by loudness (energy / pressure / intensity) , not by peaks. How i do it ? Is available Jack plugin for so what ? What is (we hear as) "loudness" ? RMS or +(average) or something else ? Is somewhere available examples how to calculate RMS ? Is it done simlpe by : &#160;int i, n;&#160; double sums, rms; &#160;sums=0.0;&#160; n=10;&#160; rms=0; &#160;for(i=0; i<n;i++) &#160;{&#160;&#160; sums = sums + ( (double)i * (double)i );&#160; } &#160;rms = sqrt(sums / n); &#160;printf("&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; rms = %12.12fnn", rms ); Is so sipmple algo good enough for frequencies > 10 kHz ? How to calculate RMS with hi-precision for frequencies > 10 kHz ? With inerpolation or so ? What is reference ( 0dB ) RMS for example for 16bit PCM signal 1024 samples ? &#160; sqrt( 1024*(0x7FFF ^ 2) / 1024 )&#160; ==&#160; sqrt( (0x7FFF ^ 2)&#160; ) == 0x7FFF&#160; Is it simple&#160; 0x7FFF (32000 dec) ? How to calc RMS for stereo signal ? So , or somehow else ? for(i=0; i<n;i++) &#160;{&#160; .... &#160;&#160; sums = sampleL/2 + sampleR/2; &#160;} In case operating with float point, what should be a bit faster,&#160; / 2&#160; or * 0.5 ? How to gotta RMS value in dB ? &#160;&#160; 20 x log10(Measured/Reference0_dB)&#160; or 10 x log10(Measured/Reference0_dB)&#160; ?? Im just physics student and im new in DSP, so pleaz no angree about simple or stuppid questions. Any examples and hints welcomed. Many Tnx in advance. Alf ----