Theo Verelst Posted January 4, 2021 Share Posted January 4, 2021 Strange thing when adding signals you've characterized the volume of in dBs: the result is hard to express in decibels. Well, it's a Maxima (or Mathematica TM) formula of one line, but it's not very intuitive. If we take the same signal coming to trough 2 amplifications doing 0 dB and -6dB in parallel and then added together gives after summing about +3.6 dB. 8 channels added (linearly mixed) in parallel, each uncorrelated noise of -80 dB gives -71dB (IIRC), whereas the same with exactly the same signals (noise or other) gives a total summed signal of -80+18=-62 dB. Sometimes it can be inportant in a feedback circuit for instance to consider changing one of two signals of almost the same amplitudeby a small amount. Say we subtract two signals of +10dB, on a mixer that can happen if you send the same signals to two strips, but you exchange the the phase and counter phase wires of the balanced inputs. The result would clearly be no signal in the mix. However if we have a 10% error in the gain settings of the strips, one signal is off by roughly 1dB, and the mix buss meter will say that the resulting addition is a signal of about -20+10= -10 dB. I've worked on compensating synthesis signal paths, fot instance as a side chain effect, so there's the relevance. Gets even more "fun" when considering normalization and the dB accuracy in the various signal paths... T Quote Link to comment Share on other sites More sharing options...
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