Speech scrambling by the matrixing of amplitude samples

If a speech signal is scrambled by varying the order of transmission of its amplitude samples, a signal of very low intelligibility can be produced. The basic defect in the system is that there is always some of the original speech spectrum left in the scrambled signal, and this is the source of the residual intelligibility. This paper shows how this original signal component may be removed completely by matrixing of the samples. A scrambled signal of virtually zero intelligibility is then produced.