37 results about "Digital audio watermarking" patented technology

The invention discloses a digital audio watermarking method capable of resisting re-recording attack. The method comprises the following steps of: 1, watermark synchronization reference point extraction: dividing a carrier audio signal into audio frames with equal length, extracting the 12-dimension semitone characteristics of each audio frame, and thus obtaining watermark synchronization reference points; 2, watermark embedding: coding watermark information to obtain a binary watermark bit coding sequence, dividing a carrier audio into a plurality of watermark synchronization units, dividing each watermark synchronization unit into a plurality of audio sample sections, and embedding a watermark into a frequency spectrum of a low-frequency domain of each audio sample section through binary coding; and 3, watermark extraction: during the watermark extraction, dividing each watermark synchronization unit into the corresponding audio sample sections according to synchronization reference points extracted by parameters for the watermark embedding, respectively calculating a mean value of the frequency spectrum in a low-frequency spectrum interval of each audio sample section, and extracting the audio section interval watermark bit of each mean value. According to the method, the embedding position of the watermark can be accurately determined, and the re-recording attack can be resisted. The method is high in robustness.

A system and method for embedding digital audio watermarks in audio source information based at least upon identified video content are described. An audio / video processing system receives audiovisual data. A video content analyzer within the system analyzes video source information of the audiovisual data, determines video content depicted by data in the video source information, and generates an indication of the video content. An audio watermark embedder of the system receives the indication, and based at least in part on the indication, adjusts watermark embedding parameters used for embedding the audio watermark in the audio source information.

The invention discloses a DWT-SVD-ICA-based digital audio watermarking algorithm. The algorithm is performed according to the following steps: the first step, preprocessing is performed on an original audio signal, and a watermark is embedded in a selected appropriate segment; the second step, when the watermark is embedded, three-level wavelet conversion is performed on the original audio signal, singular value decomposition is performed on an approximate component of the wavelet conversion, and then watermark embedment is completed by utilizing a random mixing method; and the third step, when the watermark is extracted, wavelet conversion and singular value decomposition are performed on the audio signal embedded with the watermark, and then watermark blind detection is achieved by utilizing a negentropy maximization fixed point algorithm. Compared with a traditional ICA-based audio watermarking algorithm, the DWT-SVD-ICA-based digital audio watermarking algorithm is advantageous in that watermark robustness is improved to some extent, that is to say, the watermark robustness is high; and imperceptibility of the watermark can be guaranteed, and blind extraction of the watermark can also be guaranteed.

The invention discloses a digital audio watermark detection method based on multi-parameter Weibull statistical modeling. The watermark embedding is to first select the SWT high-frequency sub-band with larger host audio energy as the optimal sub-band for watermark embedding. Its coefficients are modified, and the subband of the modified coefficients and other subbands are combined to perform SWT reconstruction to obtain watermarked audio; watermark extraction is to perform SWT on the watermarked audio at the receiving end, and use multi-parameter Weibull distribution to its high-frequency subbands. Carry out modeling with important coefficients, and use the correlation of coefficients in subbands to estimate the parameters of the model; finally, use the maximum likelihood and local maximum potential energy test methods to design a local optimal detector to extract specific watermark information, and obtain the final watermark information in order. watermark sequence.

The present invention relates to a method of detecting and recovering the voice signal tampering by using the digital audio watermarks. The method takes the compression version of an original signal as a watermark signal, so that the watermark signal does not contain other redundant information and also does not need other information relevant with the original signal at recovery, and accordingly, the watermarks have a self-recovery performance. According to the redundancy of a digital watermark signal, the watermark information is embedded in the least significant bits (LSBs) of the signal. The watermark signal can accurately position and recovers a signal broken area, and can have a satisfying recovery effect while keeping a higher signal to noise ratio.

The invention provides a method for embedding and extracting digital audio watermarks in a time domain on the basis of audio breakpoints, and an energy value of an original audio is directly changed on the basis of the original audio according to a numerical value of watermark information and the energy value of the original audio. Only little change is made on the basis of an original signal, and good robustness, cutting resistance and less information increase of watermarks are guaranteed on the premise that the hearing quality of the original audio is not influenced. In a watermark extraction link, the positions of the embedded watermarks can be automatically screened by an extraction algorithm, information which looks like watermarks in numerical logic is excluded, and the capability of storing original watermark information is provided. According to the method, the watermark information is encrypted. The used watermark extraction scheme is a blind watermark algorithm and can be used for processing audio signals, protecting audio products and the like, only fragmentation information of the original audio and reconstruction parameters of watermark signals are needed, and the participation of the original audio and original watermarks is not needed.

The present invention provides a digital audio watermark detection method and device, wherein the digital audio watermark detection method comprises: acquiring an audio file to be detected, inputting the audio file to be detected into a watermark detection module for processing, and obtaining the audio file to be detected The amplitude spectrum corresponding to the file without adding the preset watermark load information, the ratio sequence of the amplitude spectrum of the audio file to be detected and the corresponding amplitude spectrum without adding the preset watermark load information is input into the watermark decoding module for processing. processing, to obtain load information of the audio file to be detected; determining whether the audio file to be detected contains preset watermark information according to the load information. The invention also provides a digital audio watermark detection device. The digital audio watermark detection method and device of the present invention can not only improve the attack resistance of the watermark, but also ensure the detection of watermarked audios added with the same scheme but with different parameters.

The invention provides a robust digital audio watermarking algorithm in view of time-frequency analysis. The algorithm comprises steps of: first subjecting a selected audio segment to non-overlapping short-time Fourier transform to obtain a time-frequency distribution map of an audio signal, performing windowing and blocking in the low and medium frequency range of the time-frequency distribution map, and randomly selecting a characteristic energy block with low energy as a specific position for embedding a watermark; embedding generated binary watermark bits into the corresponding characteristic energy blocks by means of an extended code by using an improved spread spectrum watermark embedding method; after the watermark embedding, obtaining the characteristic energy blocks with embedded watermark by means of a watermark embedding position conveyed by a watermark embedder, and recovering a watermark sequence by using a watermarked characteristic energy block vector and the plus or minus characteristic of spread code inner product. The algorithm can guarantee the quality of a main signal by embedding the watermark into the low-frequency and low-energy position of the frequency domain, and can still recover the watermark after the watermarked signal is subjected to quantification, noise, amplitude zooming, AAC coding compression and low-pass filtering.

The invented method is a new digital watermark method for embedding gray image (or color image) into original digital audio production, belonging to area of information safety and multimedia information processing. first, watermark image is encoded as one dimension binary sequence, and scrambling encryption is added. Next, sectionalized treating is carried out for digital audio signal. Based on features of time domain shelter of human auditory system, integer type upgraded wavelet transform is carried out for sect of audio frequency selected in selfadaptation. Then, based on features of frequency domain, wavelet coefficient is determined in selfadaptation. Watermark information is embedded into hearing important coefficients with wavelet transformed by using quantization treating procedure. Finally, digital audio production with embedded watermark information is obtained by inversed wavelet transform and recombination of audio data sects. Inversed process can test digital watermark.

The invention relates to a method for authenticating digital audio copyright through digital watermarking, which solves the problem that the digital audio copyright in the prior art can not be protected. The invention discloses an existing government file-based system. The method comprises the steps: implanting digital audio watermarking in the intermediate link, conducting transcoding processing, effectively binding an audio source with the basic information of the file, conducting supervision and inspection on an sp service provider through a detection terminal so as to prompt standardization of digital music market, so that the technical effect of effectively protecting digital audio copyright can be achieved.