摘要
Analysis-by-synthesis linear predictive coding(AbS-LPC)is widely used in a variety of low-bit-rate speech codecs.Most of the current steganalysis methods for AbS-LPC low-bit-rate compressed speech steganography are specifically designed for a specific coding standard or category of steganography methods,and thus lack generalization capability.In this paper,a general steganalysis method for detecting steganographies in low-bit-rate compressed speech under different standards is proposed.First,the code-element matrices corresponding to different coding standards are concatenated to obtain a synthetic code-element matrix,which will be mapped into an intermediate feature representation by utilizing the pre-trained dictionaries.Then,bidirectional long short-term memory is employed to capture long-term contextual correlations.Finally,a code-element affinity attention mechanism is used to capture the global inter-frame context,and a full connection structure is used to generate the prediction result.Experimental results show that the proposed method is effective and better than the comparison methods for detecting steganographies in cross-standard low-bit-rate compressed speech.
基金
supported partly by Hainan Provincial Natural Science Foundation of China under Grant No.618QN309
partly by the Important Science&Technology Project of Hainan Province under Grant Nos.ZDKJ201807 and ZDKJ2020010
partly by the Scientific Research Foundation Project of Haikou Laboratory,Institute of Acoustics,Chinese Academy of Sciences
partly by the IACAS Young Elite Researcher Project(QNYC201829 and QNYC201747).