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一种话音伪装或置乱传输的方法和装置,它利用了一个时间置乱单元和一个频率置乱单元。前者至少将话音频带分成两个付频带,一个付频带相对于另一个付频带有时延,并形成合成信号;后者再将合成信号分成两个带宽可变的第二种付频带,它们周期地互换,并形成能在线路上传输的信号。这样不仅掩盖了话音信号的声学特征,而且掩盖了话音的韵律。所以,随着密钥的高速变化,传输的保密度相应提高,并确保低的失真率。
A method and apparatus for camouflaging or scrambling voice transmissions that utilizes a time scrambling unit and a frequency scrambling unit. The former divides at least the voice band into two subbands, one with respect to the other, and forms a composite signal which divides the composite signal into two second subbands with variable bandwidths Interchangeable, and form signals that can be transmitted on the line. This not only masks the acoustic characteristics of the voice signal, but also masks the rhythm of the voice. Therefore, with the high-speed key changes, the transmission of a higher degree of security, and to ensure low distortion rate.