Time frequency analysis: Theory and applications by Leon Cohen

By Leon Cohen

that includes conventional insurance in addition to new learn effects that, before, were scattered in the course of the specialist literature, this publication brings together—in uncomplicated language—the easy rules and techniques which have been built to check ordinary and man-made indications whose frequency content material alterations with time—e.g., speech, sonar and radar, optical pictures, mechanical vibrations, acoustic signs, biological/biomedical and geophysical indications. Covers time research, frequency research, and scale research; time-bandwidth family members; immediate frequency; densities and native amounts; the fast time Fourier remodel; time-frequency research; the Wigner illustration; time-frequency representations; computation tools; the synthesis challenge; spatial-spatial/frequency representations; time-scale representations; operators; normal joint representations; stochastic indications; and better order time-frequency distributions. Illustrates each one thought with examples and indicates how the equipment have been prolonged to different variables, akin to scale. For engineers, acoustic scientists, clinical scientists and builders, mathematicians, physicists, and mangers operating within the fields of acoustics, sonar, radar, picture processing, biomedical units, communique.

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Example text

Assume that f is band-limited with [− 12 N ξ, 12 N ξ ], that is, max{|ξ | : f (ξ ) = 0} ≤ 12 N ξ and denote fk = f (k ξ ). We can recover f from f without any loss of information provided that it meets the Nyquist criterion: 1 1 = . ξ≤ N x FOV Hence, if ξ = 1/(N x), the DFT gives N/2−1 fn = fk e2π i(kn)/N , n=− k=−N/2 N N , . . , − 1. 2 2 Extending the sequence f = (f−N/2 , . . , f(N/2)−1 ) to the N-periodic sequence in such a way that fn+mN = fn , the discrete version of the Poisson summation formula is N/4−1 fn + fn+N/2 = f2k e2π i(2kn)/N , k=−N/4 n=− N N , .

2 2 If D 2 f (x) is a positive definite matrix, then, for a sufficiently small r, f (x) < f (x + h) + f (x − h) 2 for all |h| < r, Signal and System as Vectors 23 which leads to the sub-MVP f (x) < 1 |Br (x)| Br (x) f (y) dy. Similarly, the super-MVP can be derived for a negative definite matrix D 2 f (x). ⊂ Rn → R is a C 3 function and ∇f (x0 ) = 0. 2 Suppose f : 1. If f has a local maximum (minimum) at x0 , then the Hessian matrix D 2 f (x0 ) is negative (positive) semi-definite. 2. If D 2 f (x0 ) is negative (positive) definite, then f has a local maximum (minimum) at x0 .

2 Let A ∈ L(Rn , Rm ). Then • x∗ is called the least-squares solution of y = Ax if Ax∗ − y = infn Ax − y ; x∈R • x is called the minimum-norm solution of y = Ax if x† is a least-squares solution of y = Ax and † x† = inf{ x : x is the least-squares solution of y = Ax}. If x∗ is the least-squares solution of y = Ax, then Ax∗ is the projection of y on R(A), and the orthogonality principle yields 0 = Az, Ax∗ − y = zT (AT Ax∗ − AT y) If AT A is invertible, then for all z ∈ Rn . x∗ = (AT A)−1 AT y and the projection matrix on R(A) can be expressed as PA = A(AT A)−1 AT .

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