Gabor Analysis And Algorithms- Theory And Applications (applied And Numerical Harmonic Analysis)

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ISBN 10: 0817639594 / ISBN 13: 9780817639594

Edité par Birkhäuser, 1997

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Détails bibliographiques

• Titre: Gabor Analysis And Algorithms- Theory And Applications (applied And Numerical Harmonic Analysis)
• Éditeur: Birkhäuser
• Date de parution: 1997
• Langue: anglais
• ISBN à 10 chiffres: 0817639594
• ISBN à 13 chiffres: 9780817639594
• Reliure: Couverture rigide
• État de l'article: Brand New

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Synopsis

In his paper Theory of Communication [Gab46], D. Gabor proposed the use of a family of functions obtained from one Gaussian by time-and frequency- shifts. Each of these is well concentrated in time and frequency; together they are meant to constitute a complete collection of building blocks into which more complicated time-depending functions can be decomposed. The application to communication proposed by Gabor was to send the coeffi- cients of the decomposition into this family of a signal, rather than the signal itself. This remained a proposal-as far as I know there were no seri- ous attempts to implement it for communication purposes in practice, and in fact, at the critical time-frequency density proposed originally, there is a mathematical obstruction; as was understood later, the family of shifted and modulated Gaussians spans the space of square integrable functions [BBGK71, Per71] (it even has one function to spare [BGZ75] . . . ) but it does not constitute what we now call a frame, leading to numerical insta- bilities. The Balian-Low theorem (about which the reader can find more in some of the contributions in this book) and its extensions showed that a similar mishap occurs if the Gaussian is replaced by any other function that is "reasonably" smooth and localized. One is thus led naturally to considering a higher time-frequency density.