## Approximation

Purpose

Description

Macro Synopsis

Modules

Related Functions

### Purpose

Wavelet approximation

### Description

"Approximation" computes a coarser approximation of the input
signal. The signal is reconstructed from its discrete wavelet
transform by using only the values of the approximation at the given octave *n*. The result is the projection of the input signal onto a subspace of the multiresolution analysis that corresponds to the current wavelet. The subspace is generated by scaled and translated versions of the scaling function.

Its parameter is the

- number n of octaves (decomposition depth).

### Macro Synopsis

`y = WaveletApprox(x,n);`

signal x,y;

int n;

### Modules

Wavelet

### Related Functions

Define wavelet, Load wavelet,
Save wavelet, Decompose,
Reconstruct, Detail