G.729A compressed pronunciation flow information hiding detection device and detection method

The invention discloses a G.729A compressing pronunciation flow information hiding detection device, which at least comprises a compressing pronunciation flow mapping phoneme sequence module, a phoneme sequence feature extraction module group, a grader device and a result integration module. The compressing pronunciation flow mapping phoneme sequence module receives compressing pronunciation flowdelivered from the outside, enables the compressing pronunciation flow to be mapped into phoneme sequences and outputs the phoneme sequence. The phoneme sequence feature extraction module group respectively extracts and outputs phoneme vector space feature vectors and phoneme state transfer first-order markov feature vectors of phoneme sequences. The grader device respectively trains graders for different feature vectors based on training sets, and train is used for samples in unknown types to obtain the graders for conducting classification and output classification results. The result integration module integrates output results of a plurality of graders and outputs the output results serving as final steganography detection results. The G.729A compressing pronunciation flow informationhiding detection device is applicable to detection of conducting quantization index modulation (QIM) information hiding through a grouping vector codebook optimized and divided by copy number variation (CNV) in a voice coding process based on a G.729A standard.