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2.2 FACTORS AFFECTING PROPAGATION OF SOUND There are several important factors, which affect the propagation of sound: geometric spreading, atmospheric effects, and surface effects. These are discussed separately below. 2.2.1 Geometric Spreading This refers to the spreading of sound energy as a result of the expansion of the wave fronts.
March 10, 2003. Introduction: Sensorineural hearing impairment alters sound perception in a complex nonlinear manner. The relative amplitudes of harmonics and temporal modulations are among the many characteristics of sound that are altered, resulting in distorted percepts such as timbre and loudness. These changes to the perception of sound due to hearing impairment affect both speech intelligibility and sound quality.