2. Notion of psychoacoustic perception

2.1 Perception of a reflection

Figure 8 , based on the work of the English acoustician M. Barron, summarizes the various perceptible effects as a function of the delay of a single reflection and its level relative to that of the direct sound.

The following considerations apply:

• Below the threshold line, the reflection causes no perceptible effect.

• High-amplitude, strongly delayed reflections cause a sensation of frank echo that is generally...