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The magnitude of the decline in performance is very alarming when the features commonly used in normal speech recognition system are directly used as the input feature of whispered speech in the speech recognition system trained by normal speech. In this paper, in order to finding the characteristics of better matching degree between normal and whispered speech, we propose a spectrum sparse-based...
This paper uses digital speech as research object. A baseline system of Mandarin whispered digital speech recognition using Hidden Markov Model is built. In this paper, the performance of the baseline recognition system is analyzed in detail and we find there are three pairs of easily confused speech. Furthermore, the cause of confusion is analyzed in depth. Then a classifier for distinguishing between...
This paper designs the H∞ state feedback controller of the low-orbit satellite to achieve the high precision attitude control. Based on the analysis of the system uncertainty and environment disturbance of the low-orbit satellite, H∞ method is adopted and the LMI arithmetic is used to make the computation easier. The results of the system simulation prove that the algorithm is useful and can make...
The robust fault-tolerant control problem of linear uncertain systems is studied. It is shown that a solution for this problem can be obtained from a H ∞ robust predictive controller (RMPC) by the method of linear matrix inequality (LMI). This approach has the advantages of both H ∞ control and MPC: the robustness and ability to handle constraints explicitly. The robust closed-loop...
The paper presents the initialization condition for chaser flying around target and optimal keeping control algorithm to satisfy the requirement of on-orbit-servicing in eccentric orbits. The necessary condition for chaser fly around is presented by detailed analyzing with the time variant linear relative motion formula and resolution. Then, the condition for target to locate at the center of fly...
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