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Unformatted text preview: Combination of tones (Road to discuss harmony) 1. Linear superposition • If two driving forces are applied simultaneously, the response will be the sum of the responses to the driving forces individually. • For instance: doubling the driving force doubles the response. • In linear systems independent signals do not influence each other. ) , ( ) , ( ) , ( 2 1 t r t r t r ψ ψ ψ + = Linear addition of two sound waves: Linear systems (examples): Loudspeakers, microphones and amplifiers should be linear to some extent. Is ear a linear system? 2. Interference (review) Interference – combination of waves (an interaction of two or more waves arriving at the same place) Important : principle of linear superposition: (a) If the interfering waves add up so that they reinforce each other, the total wave is larger; this is called “constructive interference ”. (b) If the interfering waves add up so that they cancel each other, the total wave is smaller (or even zero); this is called “destructive interference...
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- Fall '09
- Force, 2 K, 1.5 m, A. B. C. D, 1.70M, 2 2 2 2 k