Notion of stamp
Perception of sound intensity, pitch and timbre

The definition of timbre is based on a kind of default observation. When we attempt to compare two sounds, we can easily judge that they are different when their sonies differ or when their pitches differ, even if the conditions of presentation are otherwise identical. In terms of the physical parameters of the stimuli, these differences have a simple meaning, as we have seen in the preceding paragraphs.

This definition is flawed in many ways, since sounds without pitch can also have different or similar timbres, and the notion of presentation...