Critical bandwidth corresponds to the masker frequency range that fills a single auditory filter

Evidence

The frequency difference between the pure tones at the point at which a listener’s perception changes from rough and separate to smooth and separate is known as the critical bandwidth, and it is therefore marked CB in the figure. — David M. Howard, Jamie Angus, Acoustics and Psychoacoustics, 578

Categorization

• DEFINE: Defines critical bandwidth in perceptual terms of rough-to-smooth transition.