EMBEDDING CODES IN AN AUDIO SIGNAL
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United States of America Patent
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Issued Date -
Oct 6, 2016
app pub date -
Mar 31, 2015
filing date -
Mar 31, 2015
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Abstract
A method of communicating data imperceptibly in an audio signal. The method comprises, for each sub-band of the audio signal, identifying the tone in that sub-band having the highest amplitude. An audio code comprising the data to be communicated is scaled by a frequency mask profile, the frequency mask profile having maxima at the frequencies of the identified tones. The audio signal and the scaled audio code are aggregated to form a composite audio signal. The composite audio signal is then transmitted.
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