**3.1 Algorithm using wavelets**

As it has been previously mentioned, wavelet packets will be used in order to detect formants location. The reason of the choosing of this technique is their ability to separate the speech signal in different subbands, allowing to separate the formants bands quite exactly.

The here proposed method makes use of a double analysis. Firstly, a general analysis is applied over the whole spectrum, in this step a band in which the formant is located is approximated, and secondly the exact formant location is determined more accurately, the formant location accuracy can be adjusted through introducing more analysis levels inside the formant approximation band.

The main advantage of this method is the possibility of achieving a great frequency resolution, without consuming excessive computational resources, which is crucial when implementing the algorithms in a real-time device, such as a DSP.
