METHODS AND APPARATUS TO PERFORM AUDIO WATERMARKING AND WATERMARK DETECTION AND EXTRACTION
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United States of America Patent
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Sep 6, 2018
app pub date -
May 7, 2018
filing date -
May 7, 2018
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Abstract
Methods and apparatus to perform audio watermarking and watermark detection and extraction are disclosed. Example apparatus disclosed herein to embed a code into an audio signal include means for selecting frequency components to be used to represent the code, different sets of frequency components to represent respectively different information, respective ones of the frequency components in the sets of frequency components located in respective code bands, there being multiple code bands and spacing between adjacent code bands being equal to or less than the spacing between adjacent frequency components in the code bands. Disclosed example apparatus further include means for synthesizing the frequency components to be used to represent the code and means for combining the synthesized frequency components with an audio block of the audio signal.
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