The melting and solidification furnace for crystalline material includes a crucible having a bottom and side walls, and means for heating the crystalline material by magnetic induction. The position and amplitude of each pulse for exciting a filer for speech synthesis are calculated based on autocorrelation and cross-correlation. The outer layer is either conductive or semi-conductive. If network resources are needed and a secondary PDP context is to be activated, the activation of said secondary PDP context is triggered.