<P> The beating and roughness sensations associated with certain complex signals are therefore usually understood in terms of sine - component interaction within the same frequency band of the hypothesized auditory filter, called critical band . </P> <Table> <Tr> <Td> </Td> <Td> Two pitches moving from the interval of a Major 2nd to a unison This file illustrates the roughness and beat oscillations that gradually reduce as the interval moves towards the unison . </Td> </Tr> <Tr> <Td_colspan="2"> Problems playing this file? See media help . </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> Two pitches moving from the interval of a Major 2nd to a unison This file illustrates the roughness and beat oscillations that gradually reduce as the interval moves towards the unison . </Td> </Tr> <Tr> <Td_colspan="2"> Problems playing this file? See media help . </Td> </Tr>

Two or more simultaneously sounding tones that evoke a sense of tension are referred to as consonant