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Daubechies Wavelets: dbN

In dbN, N is the order. Some authors use 2N instead of N. More about this family can be found in [Dau92] pages 115, 132, 194, 242. By typing waveinfo('db), at the MATLAB command prompt, you can obtain a survey of the main properties of this family.

Figure 6-12: Daubechies Wavelets db4 on the Left and db8 on the Right

This family includes the Haar wavelet, written db1, the simplest wavelet imaginable and certainly the earliest. Using waveinfo('haar'), you can obtain a survey of the main properties of this wavelet.

Haar


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dbN

These wavelets have no explicit expression except for db1, which is the Haar wavelet. However, the square modulus of the transfer function of h is explicit and fairly simple.


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