Audio watermark encoding with reversing polarity and pairwise embedding
First Claim
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1. A method of embedding a watermark in an electronic audio signal, the method comprising:
- generating a watermark signal;
mapping the watermark signal to pairs of embedding locations;
in a pair of embedding locations, inserting the watermark signal in a first member of the pair, and inserting the watermark signal in a second member of the pair with reverse polarity.
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Abstract
Audio watermark encoding methods employ reversing polarity and pairwise embedding. A watermark signal is generated, mapped to pairs of embedding locations and inserted in the members of the pair with reverse polarity. The pairs of embedding locations correspond to adjacent regions or frames in time or frequency domains. A method for controlling an audio output device captures audio from the device, extracts its identity from a watermark, and modifies the operation of the device, e.g. varying watermark strength or audio loudness.
58 Citations
20 Claims
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1. A method of embedding a watermark in an electronic audio signal, the method comprising:
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generating a watermark signal; mapping the watermark signal to pairs of embedding locations; in a pair of embedding locations, inserting the watermark signal in a first member of the pair, and inserting the watermark signal in a second member of the pair with reverse polarity. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling audio output by an audio output device, the audio output device configured to generate sound upon receipt of an electronic signal applied by an audio output control device, the method comprising:
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capturing an audio signal from the ambient environment, the audio signal being output by the audio output device, the audio signal including an audio watermark signal identifying the audio output device; detecting the audio watermark signal and extracting the identity of the audio output device; and by reference to the identity of the audio output device, modifying at least one attribute of the audio output by the audio output device. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A system for encoding a digital watermark in an electronic audio signal, the system comprising:
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one or more processors configured to; transform a digital message into a digital watermark signal; map the digital watermark signal to pairs of adjacent frames of the electronic audio signal; encode the watermark signal in a first member of each pair; encode the watermark signal in a second member of each pair with reverse polarity; and provide an output electronic audio signal with the digital watermark signal encoded in plural pairs of adjacent frames of the audio signal. - View Dependent Claims (17, 18, 19, 20)
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Specification