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本发明与模拟信号的保密通信系统有关,它是在频域技术中而不是在时域技术中进行置乱或掩盖,这样就保持原始信号的带宽不变。在发送端,消息信号X_a(t)在被掩盖形成保密付立叶变换序列x.(n)之前,先让其通过付立叶变换处理器12和置乱器14。然后序列x(n)通过一个付立叶逆变换处理器16就形成保密消息信号x(t),该处理器产生的保密信号x(t)与原始消息信号x_a(t)带宽相同。在接收端,加密信号x(t)通过一付立叶变挟处处器22和一个完成与上述置乱器共轭运算的解乱器24,除去保密付立叶变换的掩盖,以再生出原始付立叶变换x_a(n)。让x_a(n)通过一付立叶逆反换处理器26就恢复原始消息信号x_a(t)。
The present invention relates to a secure communication system for analogue signals which is scrambled or masked in the frequency domain technology and not in the time domain technology so as to maintain the bandwidth of the original signal unchanged. At the sending end, the message signal X_a (t) is passed through the Fourier transform processor 12 and the scrambler 14 before being masked to form a secure Fourier transform sequence x. (N). The sequence x (n) then forms a secret message signal x (t) by a inverse Fourier transformer processor 16 which generates the same secret signal x (t) as the original message signal x_a (t). At the receiving end, the encrypted signal x (t) is removed from the privacy-preserving Fourier transform mask by a pay-leaf cloaking processor 22 and a descrambler 24 which performs a conjugate operation with the scrambler to reproduce the original Fourier transform x_a (n). Let x_a (n) recover the original message signal x_a (t) by a Fourier swap processor 26.