Robust Information Hiding in Speech Signal Based on Pitch Period Prediction

The paper managed to propose a robust information hiding method in speech signal with respect to low bit rate codecs. A novel pitch period prediction method of speech signal for information hiding is presented. It first estimates the pitch period of short time speech signal, and then predicts the next period data by the previous one with one parameter according to the least-mean-square-error criterion. Based on the basic idea of Scalar Costar Scheme (SCS), the secret information is embedded into the predict parameter and thus generates the stego speech. Experiments indicate that the stego speech is imperceptive to human ears, and it can resist to attacks such as additive noise, resampling, especially to speech codecs employed in GSM and CDMA.