Figure 1
From: Scrambling-based speech encryption via compressed sensing

Sparsity of three types of speech over K – L incoherent dictionary. The horizontal axes stand for the amplitudes of signals, the vertical axes stand for the indices of vectors.
From: Scrambling-based speech encryption via compressed sensing
Sparsity of three types of speech over K – L incoherent dictionary. The horizontal axes stand for the amplitudes of signals, the vertical axes stand for the indices of vectors.