Multipulse is a well known, analyisis by synthesis technique to model the LPC residual signal. With this model, speech can be coded at medium bit rates with good quaity. However, the determination of the pulse location is a combinatorial problem with no closed form solution. For these reasons suboptimal procedures are used. In this paper, inhomogeneous SA structures have been used for solving the multipulse problem; the obtained performaces are compared with suboptimal algorithms such as the Atal's ones. As compared to the one described in [2], this algorithm achieves an effective improvement in objective performaces. As a matter of fact, an improvement of more than 1.5 dB is obtained. A set of performance curves will be also described in order to find the optimum trade-off configuration.
