In this paper, we present an algorithm for voice speed changing and pitch shifting based on TD-PSOLA. MATLAB simulation results indicate this algorithm can effectively improve the precision of pitch detection and convert speech into desired one. After the algorithm being realized and optimized, a real-time system is implemented on DSP, which can produce desired fundamental frequency and duration.

Abstract. The Inductive power transfer (IPT) systems' efficiency is determined by kinds of parameters. Aim at maximum the power transfer efficiency for Inductive power transfer (IPT) system, the efficiency of four basic topology IPT systems is analyzed. Based on the analysis, genetic algorithms (GA) are used to optimize IPT systems parameters to achieve the maximum of the power transfer efficiency. Before the GA optimization process, the IPT systems are compensated in a resonance condition which can achieve to minimize VA rating of the power supply and maximum power transfer. In the process of GA optimization, to ensure the final solutions achieving bifurcation-free operation, the solutions that generate bifurcation phenomenon (multi zero phase angle frequency) are excluded. The simulation results verify that the GA can find the best optimal solutions for all topology IPT systems.