![]() ![]() One singer singing the same song once and then making a copy of that recording, the copy will be coherent with the original.One singer singing the same song twice will not be coherent.Two singers that are singing the same song will not be coherent sounds.They will produce very similar-sounding sound, but the signal will not be identical in amplitude and phase. ![]() Two belt-grinder machines next to each other will not be coherent.The result is then displayed on the webpage. To use the calculator, the user needs to input the dB value, and upon clicking the Calculate button, the JavaScript code retrieves the input value and applies the formula to calculate the voltage. If I have two files that contain different signals but they are equally loud, and I add them together, then the result will on average be 3.01 dB louder, because the two signals are not coherent (the two files are not identical, they just happen to be of the same level). dBV refers to the dB value in decibel volts. If I have a file containing a certain signal, and I make a copy of that file, and then I add the two together, the result will be exactly 6.02 dB louder, because the two files are coherent (they are identical in amplitude, frequency and phase - they are literal copies). This doesn't tell us anything about the perceived amount of sound.Ī reduction by 6 dB means that the sound pressure is now half as high as before, but that does not mean that you will hear the result as "half as loud as before". To make matters worse, all of the above is just for the measured amount of sound. You can also measure sound intensity, or sound power, in which case the calculation looks different. However, be careful about which value you are measuring here - this is only true if you are measuring sound pressure level. Meaning that the sound pressure level is now 25 % of what it was before. if the reduction in level is 12 dB, you calculate 100 * 10 -12/20, which gives you a value of approximately 25. "-6" if the sound pressure level is reduced by 6 dB).Į.g. ![]() This means that if there is an increase of 10 decibels on the dB scale, it translates to a 10-fold increase in. On a ruler 10 cm is twice as long as 5 cm or 30 cm is thrice as long as 10 cm but on a decibel, scale levels go up in powers of 10. L being the change in level, expressed in dB (e.g. A decibel scale is a logarithmic scale and works differently than a ruler (which is a linear scale). 6 dB reduction of sound pressure level means that the sound pressure is cut in half (50 % of the original). ![]()
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