Linear discriminant analysis and kernel vector quantization for mandarin digits recognition

Linear discriminant analysis and kernel vector quantization are integrated into vector quantization based speech recognition system for improving the recognition accuracy of Mandarin digits. These techniques increase the class separability and optimize the clustering procedure. Speaker-dependent (SD) and speaker-independent (SI) experiments are performed to evaluate the performance of the proposed method. The experiment results show that the proposed method is capable of reaching the word error rate of 3.76% in SD case and 6.60% in SI case. Such a system can be suitable for being embedded in personal digital assistant (PDA), mobile phone and so on to perform voice controlling such as digit dialing, calculating, etc.