Speech Information Hiding in G．729下载

weixin_39821260 2019-07-21 12:30:32

An approach of speech inform ation hiding
based on G．729 scheme，and ABS(Analysis—by—synthesis)
algorithm of speech inform ation hiding and extracting，
which form ing the theoretical basis for designing a secure
speech com m unication system are proposed． A BS algorithm
adopts speech synthesizer in s
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An approach of speech inform ation hiding based on G．729 scheme，and ABS(Analysis—by—synthesis) algorithm of speech inform ation hiding and extracting， which form ing the theoretical basis for designing a secure speech com m unication system are proposed． A BS algorithm adopts speech synthesizer in speech coder，speech em bedding and coding are synchronous，i．e．a fusion of the inform ation data of secret and public speech． It can em — bed dynam ic data bits of secret speech into public speech， with perfect info rm ation stegan0graphy and good speech quality． A BS algorithm is superior to available classical algorithm s in capacity and real-tim e．This approach is im — plemented to hide secret speech of 2．4kbps M ELP fM ixed excitation linear prediction)in public speech of 16kbps G ．729． Experim ents show that the approach satisfies the requirem ents of inform ation hiding，m eets the secure corn — m unication speech quality constraints，and achieves high hiding capacity of 800bps with an excellent speech quality and com plicating speakers’recognition．

In this paper a information hiding algorithm applied to compressed speech bitstream is proposed. Covering codes are used to hide information in the least important bits in G.729 frames. The embedding rate is fairly high compared with the state of art algorithms, while the experiment results show that the distortion of the speech signal is imperceptible.

Absimcf-User identification must be done in speech information hiding. To shorten the time of building link and exchanging protocol, this paper presents a technology for fast cross-identification. To enhance the security of communication, encryption should be done before hiding information. After encryption, secure info is hidden in the host info which has been recorded. Bccause speech communications arc on thc full-duplex synchronization link and have burst of communications, ,so we use the same encryption nnd decryption algorithms on both sides to avoid increasing operation spending which will bc caused if using different encryption and decryption algorithms. A strict synchronization algorithm is requested, 50 the cycle buffcr synchronization algorithm is presented.

Abstract—The discrete cosine transform (DCT) has performance close to Karhunen-Loeve Transform (K-L Transform). In this paper, DCT is used for speech information hiding. Secret information is embedded by changing the parameters in DCT domain and extracted by statistical method at the receiving end. Results of analysis and experiments indicate that this algorithm can embed as well as extract secret information effectively. In the end, we successfully realize the algorithm in FPGA using Verilog language.

Abstract-Traditional speech information hiding methods have several disadvantages, for example, constant embedding amplitude, lower speech quality, higher bit error rate. A novel speech information hiding method based on Itakura-Saito measure and psychoacoustic model is proposed. The embedding amplitude can be controlled by Itakura-Saito measure and psychoacoustic model together. The host speech is decomposed by wavelet packet transformation and then mapped into the critical bands. According to the audio masking threshold, the embedding amplitude in each subband can be determined. And then, the adjustment factors can be calculated by Itakura-Saito measure to control the embedding amplitude in each frame so that the speech quality is good. The embedding amplitude can be determined automatically. Experimental results show that the performance of this method is better than that of the traditional methods.

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