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2. Filter banks
2.1 Signal transformation
The discrete Fourier transform is a common example of transforming a signal in order to obtain a "better" localization (representation of the information). An equivalent treatment is possible, using a set of bandpass filters , for which certain precautions must be taken:
if any set of bandpass filters is used, the amount of information to be processed can increase considerably;
we often need to be able to reconstruct the original signal, or a sufficient approximation, from...
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The Ultimate Scientific and Technical Reference