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1.引言模拟加密被用来保证通信经由有限频率带宽的通信路径时的安全(模拟加密称作模拟置乱)。时域和幅度及频域技术用于实现模拟置乱器。频域置乱器由于其频率带宽的限制较松、且信号时延较小配得到广泛的使用。频域置乱器采用一组模拟梳状滤波器,把话音信号的整个频带分成若干个(子)带,然后根据密钥数据算法交换子带的顺序,
1. Introduction Analog Encryption is used to ensure the safety of communications over a limited frequency bandwidth of communication paths (analog cryptography is called analog scrambling). Time-domain and amplitude and frequency domain techniques are used to implement a simulated scrambler. Frequency domain shufflers are widely used due to their relatively limited frequency bandwidth and small signal delay. The frequency domain shuffler uses a set of analog comb filters to divide the entire frequency band of the voice signal into a number of (sub) bands and then to exchange the order of subbands according to the key data algorithm,