Music: a Mathematical Offering by Dave Benson

By Dave Benson

Because the time of the traditional Greeks, a lot has been written concerning the relation among arithmetic and tune: from concord and quantity thought, to musical styles and crew conception. Benson presents a wealth of data the following to allow the instructor, the coed, or the novice to appreciate, at various degrees of technicality, the true interaction among those old disciplines. the tale is lengthy in addition to wide and contains physics, biology, psycho acoustics, the background of technology, and electronic know-how in addition to, after all, arithmetic and tune. beginning with the constitution of the human ear and its dating with Fourier research, the tale proceeds through the math of musical tools to the tips of consonance and dissonance, after which to scales and temperaments. this can be a must-have e-book that allows you to learn about the tune of the spheres or electronic song and lots of issues in among.

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Forced harmonic motion is responsible for the production of sound in most musical instruments, as well as the perception of sound in the cochlea. We shall see that forced harmonic motion is what gives rise to the phenomenon of resonance. There are two steps to the solution of the equation. 10, to give the complementary function. 1). This is called a particular integral. 1) is the sum of the particular integral and the complementary function. Examples 1. Consider the equation y¨ + 4y˙ + 5y = 10t2 − 1.

Suppose that f (θ) is periodic with period 2π, and that it is continuous and has a bounded continuous derivative except at a finite number of points in the interval [0, 2π]. 1) converges to f (θ) at all points where f (θ) is continuous. Proof. See K¨ orner [70], Theorem 1 and Chapters 15 and 16. An important special case of the above theorem is the following. A C 1 function is defined to be a function which is differentiable with continuous derivative. If f (θ) is a periodic C 1 function with period 2π, then f ′ (θ) is continuous on the closed interval [0, 2π], and hence bounded there.

6. Complex coefficients The theory of Fourier series is considerably simplified by the introduction of complex exponentials. See Appendix C for a quick summary of complex numbers and complex exponentials. 1) n=−∞ 1 1 where α0 = 21 a0 , and for m > 0, αm = 12 am + 2i bm and α−m = 12 am − 2i bm . 1) using a0 = 2α0 , am = αm + α−m and bm = i(αm − α−m ) for m > 0. 7) are replaced by αm = 1 2π 2π e−imθ f (θ) dθ. 2) 0 Exercises 1. 2, show that αm = 2/imπ 0 m odd m even. 10Note that we are dealing with complex valued functions of a real periodic variable, and not with functions of a complex variable here.

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