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...