A Steganography Method for G.729a Speech Coding

Fufang Li, Binbin Li, Liangchen Liu, Yuanyong Feng, Lingxi Peng

Table 3 The PESQ score and its percentage under different hiding processing scenarios of fixed codebook index adjustment

Experiment condition	boy voice	girl voice	male singing	female singing	Chinese music	western music
No confidential information embedded	2.841425	2.962733	3.287391	2.910467	2.876323	2.917364
Information hiding of code book bit +1 processing	2.696228	2.803634	3.096394	2.762906	2.726467	2.752533
Information hiding of code book bit +1 processing	94.89%	94.63%	94.19%	94.93%	94.79%	94.35%
Information hiding of code book bit -1 processing	2.683726	2.792376	3.111844	2.749518	2.718988	2.770621
Information hiding of code book bit -1 processing	94.45%	94.25%	94.66%	94.47%	94.53%	94.97%
Information hiding of code book bit randomly +-1 processing	2.691682	2.810745	3.109543	2.764071	2.719851	2.776164
Information hiding of code book bit randomly +-1 processing	94.73%	94.87%	94.59%	94.97%	94.56%	95.16%