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提出了一个全双工模拟语音置乱系统,它可以用于移动通信系统和公共电话交换网。置乱算法主要完成FFT(快速付里叶变换)系数重排,同时自适应地插入伪谱,并且对频谱进行压扩处理。模拟结果表明,置乱后的语音没有剩余可懂度,解乱后语音的质量相当完美。硬件由七块先进的DSP芯片组成,其中包括用于全双工工作方式的自适应均衡器和回声抵消器,本装置的性能令人非常满意。
A full-duplex analog voice scramble system is proposed, which can be used in mobile communication systems and public switched telephone networks. Scramble algorithm mainly completes the FFT (fast Fourier transform) coefficient rearrangement, simultaneously inserts the pseudo-spectrum adaptively, and performs spectrum spreading on the spectrum. The simulation results show that there is no residual intelligibility after scrambling speech, and the quality of the speech after disarming is quite perfect. The hardware consists of seven advanced DSP chips, including an adaptive equalizer and echo canceller for full-duplex operation, and the performance of this device is extremely satisfying.