Robustness evaluation using BERs (%): comparison of the conventional SVD-based method (SVD) [23
], SSA-based scheme (SSA) [28
], SSA-based scheme with the differential evolution (SSA.DE) [29
], proposed scheme without the automatic parameter estimation (Prop.), and proposed one with the automatic parameter estimation (Prop.APE) when attacks (i.e., MP3 and MP4 compression, white-Gaussian-noise addition (AWGN), resampling with 16 and 22.05 kHz (RES 16 and RES 22.05, resp.), and band-pass filtering (BPF)) were performed. AV and SD are average and standard deviation, respectively.