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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Apr 16, 2024
Grant Date -
May 25, 2023
app pub date -
Jan 20, 2023
filing date -
Nov 12, 2007
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Abstract
Methods and apparatus to perform audio watermarking and watermark detection and extraction are disclosed. Example apparatus disclosed herein are to select frequency components to be used to represent a 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 are also to synthesize the frequency components to be used to represent the code, combine the synthesized frequency components with an audio block of an audio signal, and output the audio signal and a video signal associated with the audio signal.
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