An AMR adaptive steganographic scheme based on the pitch delay of unvoiced speech

作者：Ren, Yanzhen^*; Liu, Dengkai; Yang, Jing; Wang, Lina

来源：Multimedia Tools and Applications, 2019, 78(7): 8091-8111.

DOI：10.1007/s11042-018-6600-6

• Audio
• Steganography
• Steganalysis
• AMR
• Pitch delay

In this paper, a novel AMR adaptive steganographic scheme based on pitch delay of unvoiced speech (PDU-AAS) was proposed. The existing AMR steganographic schemes based on pitch delay destroy the short-time relative stability of pitch delay of voiced speech segments and they are easier to be detected by the existing steganographic schemes. Especially, the pitch delay distribution of AMR voiced and unvoiced speech segments are analyzed in detail, and based on this characteristic that the pitch delay sequence of AMR unvoiced speech do not have short-term relative stability, we proposed an AMR adaptive steganographic scheme which selects the embedded position adaptively in the unvoiced speech segment, which is determined by the distribution characteristic of the adjacent pitch delay, and embeds the secret message by modifying the pitch delay without destroying the short-time stability of the pitch delay. The experiment results shows that the scheme has good concealment and hiding capability. Most important of all, the comparing experiment results show that the scheme has good security to resist the detection of the existing steganalysis algorithms. The principle of the scheme can be applied to the other steganographic schemes based on the pitch delay of the speech codec, such as G723.1, G.729.

• 出版日期2019-4
• 单位武汉大学