When listening in an enclosed space, part of the sound has travelled to the listener directly from its source. In addition the listener receives multiple delayed and attenuated copies of the sound as it is reflected from the room’s surfaces, an effect referred to as reverberation. This series of reflections has a filtering effect, introducing distortion in both the spectral and temporal domains. Spectral transitions are smeared in time and the introduction of slowly decaying “tails” effectively applies a low-pass filter to the temporal envelope. Since each reflection is added back to the original “direct” sound with random phase, envelope periodicity tends to be disrupted.
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Sayles, M., Schouten, B., Ingham, N.J., Winter, I.M. (2007). The Effect of Reverberation on the Temporal Representation of the F0 of Frequency Swept Harmonic Complexes in the Ventral Cochlear Nucleus. In: Kollmeier, B., et al. Hearing – From Sensory Processing to Perception. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-73009-5_5
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