Constant 1-Bark windows yield triangular noise patterns and rectangular tone patterns

Evidence

Critical-band intensity can be seen as that part of the overall unweighted sound intensity that falls within a frequency window that has the width of a critical band. The transformation of frequency into critical-band rate transfers the frequency-dependent window width into a window width of 1 Bark, independent of critical-band rate. This window of I-Bark width can be continuously shifted along the critical-band scale. Consequently, a criticalband wide narrow-band noise produces a critical-band intensity which is a function of critical-band rate, and which shows the form of a triangle with a base width of 2 Bark. A sinusoidal tone, however, produces a function with a rectangular shape and the width of 1 Bark. — Professor Dr.-Ing. Hugo Fastl, Professor Dr.-Ing. Eberhard, Psychoacoustics- Facts and Models, 950

Categorization

• XREF: The triangular-vs-rectangular excitation shapes set up masking-pattern analyses and the self-masking spread seen in loudness models.