An Introduction to Wavelet Analysis by David F. Walnut

By David F. Walnut

This publication offers a complete presentation of the conceptual foundation of wavelet research, together with the development and research of wavelet bases. It motivates the valuable principles of wavelet thought through supplying a close exposition of the Haar sequence, then exhibits how a extra summary process permits readers to generalize and enhance upon the Haar sequence. It then provides a couple of diversifications and extensions of Haar development.

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40(a), it will be sufficient t o prove that f,, (z) + f (z) in L1 on R. Let e > 0. )( d x < 1/3 and / J,q(x) 1 di < r/3. 38(b),if f,,(x) + f (z) in LtX or L~ on [-R, R], then it also converges in L1 on [-R, R]. That is, Hence, there is an N such that if n LR1 R fn Therefore, if n > N, then > N, then (x) - f ( x i I dz < d3. 24 Chapter 1. 7) follows. 41. 42. Suppose that f o r every R > 0, f,,(x) o n [-R, R]. 41, except that we choose R > 0 and N E N such that for all n 2 N. 9) follows. 43. 25. 44.

Suppose that {K,(x)),>o i s an approximate identity o n R. T h e n f ( t )K T ( a - t ) dt = f ( a ) . 2. Approximate Identities 43 Proof: Note first that by a change of variables, f (t) KT( a - t ) dt = f (a - t ) KT (t) dt. 31(a), Therefore, for ally umber 6 > 0, Let t > 0. 31 (b). Hence for such a delta, - Since f (z)is L" on R, - If (y)l < 11 f /lo for all t E R. Hence, for any 6 > 0, for all y E R. Therefore, Chapter 2 . 31(c). 19) follows. Note that if K T ( x ) = (117)g ( x / r ) for some function g ( x ) , L1 on R and compactly supported, then the assumption that f (x) is L" on R is unnecessary.

IIeilce a periodic function car1 have many periods. Typically the sirlallest period of f (x) is referred to as the pernod of f ( x ) . 3. Given a function f(z)on R. n,d periodization o f f (x) is defined as the fun,ction 0, number. p > 0 , the p provzded that the sum makes sense. 4. 1). Specifically, where we have made the change of suinnlatiorl index n e n + 1. 1) will converge poiritwise on R. This is because for each x the slirn will have only finitely riiaiiy terms. (c) If f (x) is supported in an interval I of length p.

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