Re: [Sv1-devel] dBFS

[<me...@in...>]

<div>Hello,</div><div> </div><div>Well, if you check the source code of Sonic Visualiser you could spot this lines..</div><div><div>AudioLevel - float dB = 10 * log10f(multiplier);</div></div><div><div>SpectrumLayer - value = 10.f * log10f(value);</div><div> </div><div>so if you are saying why does Sonic Visualiser use 10 instead 20 you may check here :<br /><br />https://www.cds.caltech.edu/~murray/wiki/index.php/Why_is_dB_defined_as_20log_10%3F</div><div> </div><div> </div></div><div> </div><div>Regards,</div><div>Mehmet</div><div> </div><div>20.01.2021, 17:12, "Christofer Bustad" &lt;tos...@ho...&gt;:</div><blockquote><div><div style="color:rgb( 0 , 0 , 0 );font-family:'calibri' , 'helvetica' , sans-serif;font-size:12pt">Hi there,<div> </div><div>Thank you to all who contributed to this great and very useful piece of open-source software.</div><div> </div><div>I wonder if someone may help me to understand something... If I generate a pure sine wave at say -20 dBFS in Adobe Audition, Sonic Visualiser displays the level -10 dBFS in the waveform view. Similarly, if I generate a sine wave at -40 dBFS in Adobe Audition, Sonic Visualiser displays the level -20 dBFS. Could it be the case that Sonic Visualiser calculates the dB values using 10*log10(input)? It was my understanding that dB values usually are calculated from sample values using 20*log10(input). <span style="background-color:#ffffff">Am I missing something in my understanding of this or </span>could this be a bug in Sonic Visualiser? There also seems to be a similar difference in the spectrum view when I compare Sonic Visualiser to Adobe Audition.</div><div> </div><div>Thank you very much in advance!</div><div> </div><div>Best regards,</div> Christofer</div><div style="color:rgb( 0 , 0 , 0 );font-family:'calibri' , 'helvetica' , sans-serif;font-size:12pt"> </div></div>,,<p>_______________________________________________<br />Sv1-devel mailing list<br /><a href="mailto:Sv1...@li..." rel="noopener noreferrer">Sv1...@li...</a><br /><a href="https://lists.sourceforge.net/lists/listinfo/sv1-devel" rel="noopener noreferrer">https://lists.sourceforge.net/lists/listinfo/sv1-devel</a></p></blockquote>