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The Journal of The Korea Institute of Intelligent Transport Systems Vol.7 No.5 pp.90-96
텔레메틱스 단말용 음성 인식을 위한 음성향상 알고리듬 및 칩 구현
Implementation of Chip and Algorithm of a Speech Enhancement for an Automatic Speech Recognition Applied to Telematics Device
Abstract
This paper presents an algorithm of a single chip acoustic speech enhancement for telematics device. The algorithm consists of two stages, i.e. noise reduction and echo cancellation. An adaptive filter based on cross spectral estimation is used to cancel echo. The external background noise is eliminated and the clear speech is estimated by using MMSE log-spectral magnitude estimation. To be suitable for use in consumer electronics, we also design a low cost, high speed and flexible hardware architecture. The performance of the proposed speech enhancement algorithms were measured both by the signal-to-noise ratio(SNR) and recognition accuracy of an automatic speech recognition(ASR) and yields better results compared with the conventional methods.
