A Study On Detection Of Speech Signal Tampering

In this study,we use semi-fragile audio watermarking technology to detect and locate the tamping location.The so-called tamper detection and orientation is to embed watermarking in the original audio signal,audio signal watermark has been tampered with and destroyed,can extract the watermarking to detect audio tampering damage location,and precise positioning.Digital watermarking technology is relatively mature in the field of image,but in the audio field,it restricts the embedding of watermark information because the human auditory system is more sensitive than the visual system.Therefore,the research of audio watermarking mostly focuses on the protection of the ownership of audio signals and property rights information and the research on tampering detection and localization is relatively few,or much simple.The research aims to develop a novel watermarking algorithm for tamper detection and localization of audio signals,which has the characteristics of semi-fragile and invisibility.In this study,the original signal by discrete wavelet transform(DWT),the approximate component CA and detail component CD,and the watermark is embedded into the CD,and then the inverse wavelet transform to obtain the audio signal watermark embedding,watermark can locate the precise location of the destruction of audio.Experiments show that the embedded watermark signals are invisible,and the audio signals can still be located accurately at the rate of sixty percent damage.