Critical Band(width) (CB)

A sine tone at a frequency $f$ activates a region along the BM rather than a single spot.

• if a second sinewave with frequency near that of the first is played, it will activate a region on the BM that is already active and will likely sound less loud.
• if the second sinwave has a frequency sufficiently different from that of the first, a new region on the BM will be activated, making the sound seem louder.

Loudness can be used as a means of measuring CB:

• CBusingLoudness.pd