Method and device for adaptive search bandwidth pitch in coding wideband signals

Patent of Invention: 'SEARCH METHOD AND APPARATUS FOR ADAPTIVE PITCH bandwidth in the band signal coding WIDE' ' . The present invention relates to an improved method and pitch search device to digitally encode a broadband signal, in particular but not exclusively a speech signal, to transmit, or store, and synthesizing this sound signal broadband. The new method and device that can efficient modeling of the harmonic structure of the speech spectrum uses several forms of low pass filters applied to a codifo vector pitch is selected the one that produces higher gain forecast (ie, the smallest error pitch prediction) and the book parameters associated pitch code are advanced.