Optimization of a Blind Speech Watermarking Technique against Amplitude Scaling

Table 4

Comparison of various watermarking techniques in terms of payload and imperceptibility.

Technique	Quality scale	Effort required to understand meaning scale	SNR (dB)	Theoretical payload (bps)
Analysis-by-Synthesis [22]	4.01–3.80	4.76–3.95	28.08–25.32	33.33–50
Formant tuning [21]	4.98–4.32	5.00–4.55	30.32–27.54	33.33–50
DWPT+ multiplication [14]	4.32–3.10	5.00–3.55	37.21–20.08	31.25–125
The proposed method	4.87–3.65	5.00–4.05	42.11–20.71	40–400