电讯技术Issue(2)：195-200,6.DOI:10.3969/j.issn.1001-893x.2016.02.015
端到端语音加密通信的同步信号设计
Design of Synchronous Signal for End-to-End Speech Encryption Communication
陈瑶瑶 1郝建华 1张子博1
作者信息
- 1. 装备学院 研究生管理大队，北京101416
- 折叠
摘要
Abstract
In the process of the encrypted speech communication,the receiver needs to synchronize the signal to decrypt the speech precisely and restore the original speech signal. However,the existing methods have low accuracy and cost a large computation. In order to solve the synchronization problem in the process of the end-to-end speech encryption and decryption,this paper designs a new synchronous signal structure based on the linear frequency modulation( LFM) signal. The synchronous signal is the chirp signal whose band-width has been filtered already and this method can avoid expanding the speech bandwidth caused by adding the synchronous signal. Synchronous signal structure is composed of two different lengths LFM signal and dif-ferent combinations will produce different synchronization effect. This design greatly improves the accuracy of synchronization and reduces the amount of synchronous operation. Theoretical analysis and experimental veri-fication show that the method can accurately locate the beginning of the received signal,and the speech sig-nal spectrum will not be broadened and affected. This synchronous signal can be transmitted through the voice codec and has anti-noise performance. Compared with the original structure of the synchronous signal, the computation cost of the scheme is greatly reduced.关键词
保密通信/语音加解密/同步信号结构/端到端/线性调频信号Key words
secure communication/speech encryption and decryption/synchronous signal structure/end-to-end/linear frequency modulation signal分类
信息技术与安全科学引用本文复制引用
陈瑶瑶,郝建华,张子博..端到端语音加密通信的同步信号设计[J].电讯技术,2016,(2):195-200,6.
