An Authentication and Recovery Scheme for Digital Speech Signal Based on DWT

摘要

A tamper recovery scheme for speech signal based on digital watermark is proposed. In this paper, a compression method based on discrete wavelet transform is discussed, and one block-based embedding method for speech signal is explored. Firstly, speech signal is framed, scrambled and segmented. Secondly, frame number is embedded into the first two segments. The compressed signal of each frame after being scrambled is embedded into other two segments by using the block-based method. Attacked frames can be located by frame number. If watermarked speech is attacked, compressed signals are extracted to perform tamper recovery. Performance analyses indicate that the scheme proposed not only improves the accuracy of tamper localization and the security, but also has the ability of tamper recovery.