Abstract: The article focuses on formulas for calculating the addition of sound levels when the disturbances
of the acoustic pressures that determine them are correlated. Based on the numerical experiments,
determine the level of possible errors for different coherence conditions of two noise sources. The
performed analyses are associated with the classical calculus of algebra of decibel numbers, as well as its
modifications securing the required correctness of its axiomatic. Presents the desirability of its use in the
problems of developing measurement data of small values of sound levels. Relates the need for their
potential applications to computational issues relating to the study of the sound field in special rooms (e.g.,
radio and television studios, anechoic chambers, lave caves) and the study of the environment in which
these devices or objects are located. Draws attention to their importance in estimating type B uncertainty
in controlling the state of acoustic hazards in the environment.
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