本文提出一种新的不需要帧同步模-数-模语音加密方案,称为频域幅相分离置换和幅度修正组合加密方法。理论分析和计算机模拟结果表明:这种方法和L.S.Lee体制相比,具有更高的安全性,在异步解密的情况下,没有非线性相位失真,因而恢复语音质量更高。 In this paper, we propose a new frame synchronization modulus-digital-mode speech encryption scheme, called frequency-domain amplitude-phase separation permutation and amplitude correction combined encryption method. The theoretical analysis and computer simulation results show that this method is more secure than the L.S.Lee system and has no non-linear phase distortion under asynchronous decryption, thus resulting in higher speech quality recovery.