If a sound source creates a sound level (SPL) of L1 = 60 dB and another source with L2 = 60 dB is added, then it is not the level of 120 dB, but gives an incoherent (noncoherent) summing of the signal …

Jul 23, 2025 · Coherent and Incoherent addition of waves are used in various fields of physics like acoustics, optics, and quantum mechanics. The waves adding up with each other can interfere either …

Learn how to calculate combined sound levels from incoherent sources using formulas and a calculator. Covers SPL, SIL, and loudness perception.

Because the decibel scale is a logarithmic scale, if we have two different sound sources combining together we can't simply add the sound pressure levels - what we have to do is to add the intensities.

An increase in 1 dB is the minimum increment necessary for a noticeably louder sound. The decibel is 1/10 of a Bel, and was named by Bell Labs engineers in honor of Alexander Graham Bell, who in …

Combining decibels - adding up to 10 incoherent acoustic levels The decibel calculator can be used to combine the levels of up to ten incoherent (noncoherent) electric or acoustic sources when the level …

Incoherent signals should be added using the type of "diagonal calculation" noted above. Decibel "levels" cannot be simply added together, as can amplitude values. This is because the addition of …