Methods and apparatus for audio watermarking
First Claim
1. A method comprising:
- obtaining, with a processor, a watermarked noise signal including a watermark and a first noise signal having energy substantially concentrated in an audible frequency band, the watermarked noise signal being associated with a first operating state of a device;
attenuating, with the processor and based on an ambient noise level sensed in an environment in which the device is operating, the watermarked noise signal to be substantially inaudible when the watermarked noise signal is not combined with a separate audio signal; and
outputting the watermarked noise signal in response to determining that the device is in the first operating state.
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Abstract
Methods and apparatus for audio watermarking a substantially silent media content presentation are disclosed. An example method to audio watermark a media content presentation disclosed herein comprises obtaining a watermarked noise signal comprising a watermark and a noise signal having energy substantially concentrated in an audible frequency band, the watermarked noise signal attenuated to be substantially inaudible without combining with a separate audio signal, associating the watermarked noise signal with a substantially silent content component of the media content presentation, the media content presentation comprising one or more media content components, and outputting the watermarked noise signal during presentation of the substantially silent content component.
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Citations
25 Claims
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1. A method comprising:
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obtaining, with a processor, a watermarked noise signal including a watermark and a first noise signal having energy substantially concentrated in an audible frequency band, the watermarked noise signal being associated with a first operating state of a device; attenuating, with the processor and based on an ambient noise level sensed in an environment in which the device is operating, the watermarked noise signal to be substantially inaudible when the watermarked noise signal is not combined with a separate audio signal; and outputting the watermarked noise signal in response to determining that the device is in the first operating state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A tangible computer readable storage device or storage disk including computer readable instructions which, when executed, cause a second device to at least:
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obtain a watermarked noise signal including a watermark and a first noise signal having energy substantially concentrated in an audible frequency band, the watermarked noise signal being associated with a first operating state of the second device; attenuate, based on an ambient noise level sensed in an environment in which the second device is operating, the watermarked noise signal to be substantially inaudible when the watermarked noise signal is not combined with a separate audio signal; and output the watermarked noise signal in response to determining that the second device is in the first operating state. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A device comprising:
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a watermark processor to; obtain a watermarked noise signal including a watermark and a first noise signal having energy substantially concentrated in an audible frequency band, the watermarked noise signal being associated with a first operating state of the device; attenuate, based on an ambient noise level sensed in an environment in which the device is operating, the watermarked noise signal to be substantially inaudible without combining the watermarked noise signal with a separate audio signal; and an audio processor to output the watermarked noise signal in response to determining that the device is in the first operating state. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25)
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Specification