A Steganography Method for G.729a Speech Coding

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

Table 2 The forty indexes' position allocation structure of the four excitation pulses in G729a Fixed-codebook

	Number of pulse	Amplitude sign	Excitation pulse location index
Sub-frame 1	i0	+1/-1	0, 5, 10, 15, 20, 25, 30, 35
Sub-frame 1	i1	+1/-1	1, 6, 11, 16, 21, 26, 31, 36
Sub-frame 2	i2	+1/-1	2, 7, 12, 17, 22, 27, 32, 37
Sub-frame 2	i3	+1/-1	3, 8, 13, 18, 23, 28, 33, 38 4, 9, 14, 19, 24, 29, 34, 39