A DWT Speech Hiding Algorithm Based on LDPC
Lianhai Zhang · Communications technology · 2008
A novel information hiding algorithm for security speech communication is proposed in this paper. First, Improved Multi-Band Exited(IMBE) coding is used for security speech, and the bits are encoded by LDPC. Then open audio is converted into segments and discrete wavelet transform(DWT) is performed. The security information is embedded by modifying the sub-segments energy of DWT. At the receiver, based on the same method, the sub-segments energy is determind and the hiding bit is recoverd without original audio. The secret speech is recoverd by IMBE decoding. Simulation results show that the method is robust to some attacks such as low pass filter, adding noise and so on.