In the perception of sound, early reflections are corrolated with the direct signal by the listener. Comb coloration effects arise when there are too few specular, coherent reflections. Masking develops with random phase, incoherent reflections. An early arriving, statistically diffuse group, composed of coherent reflections with random time offsets produces excellent sound fusion. Essentially an acoustic presence effect, applications include digital sampling, instrument and vocal recording and speech therapy for hearing impaired.
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