A Real-time Secure Voice Communication System Based on Speech Recognition

Authors:
Zongyuan Deng;Zhen Yang;Lixin Deng
Affiliations:
Nanjing University of Posts and Telecommunications, China;Nanjing University of Posts and Telecommunications, China;Nanjing University of Posts and Telecommunications, China
Venue:
ICSNC '06 Proceedings of the International Conference on Systems and Networks Communication
Year:
2006

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Abstract

This paper proposes a scheme of real-time secure communication system based on information hiding and speech recognition. The algorithm uses speech recognition to reduce the bit-rate of secret speech greatly. Then we design an information hiding algorithm by adaptively choosing embedding locations and adopting the multi-nary modulation technique. Experimental results show that this algorithm has good imperceptibility and robustness against various interference (A-law/U-law compression, low-pass filtering, white noise, etc) when the speech is transmitted over the public switching telephone network (PSTN). This algorithm can be widely used in secure voice communication and fax systems.