Methods for decoding watermark data from audio, and controlling audio devices in accordance therewith
First Claim
Patent Images
1. A method for controlling use of audio content comprising:
- adding an noise signal to the audio content to control or limit use of the audio content; and
in response to receiving authorization, removing the noise signal to provide a higher quality, usable version of the audio content.
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Abstract
Methods for decoding auxiliary control information from audio, and using same to control an audio appliance. Various arrangements are disclosed. One method correlates a filtered version of the audio with predetermined noise data to discern plural bits of hidden data. The data thereby extracted is used to trigger some response in the appliance, such as enabling or disabling certain operations.
98 Citations
13 Claims
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1. A method for controlling use of audio content comprising:
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adding an noise signal to the audio content to control or limit use of the audio content; and
in response to receiving authorization, removing the noise signal to provide a higher quality, usable version of the audio content. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An audio signal processor processing an audio signal for distribution through a network, which comprises:
- embedding means for embedding in said audio signal a watermark of which a signal level is audible to the human sense of hearing when the audio signal is played back.
- View Dependent Claims (8, 9, 10)
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11. An audio player playing back an audio signal distributed through a network, which comprises:
- removing means for removing a watermark from a watermark embedded audio signal using a specific key, said watermark of which a signal level is audible to the human sense of hearing.
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12. An audio distribution system including a distribution apparatus for distributing an audio signal through a network and an audio player for playing back said distributed audio signal, wherein said distribution apparatus comprises embedding means for embedding in said audio signal a watermark of which a signal level is audible to the human sense of hearing when the audio signal is played back;
- and wherein said audio player comprises removing means for removing a watermark from said watermark embedded audio signal using a specific key.
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13. An audio distribution method wherein a sending side process an audio signal for changing the format distributable through a network and a receiving side plays back said audio signal, which comprises:
- embedding a watermark in said audio signal, said watermark of which a signal level is audible to the human sense of hearing when the audio signal is played back; and
removing a watermark from said watermark embedded audio signal using a specific key at playback.
- embedding a watermark in said audio signal, said watermark of which a signal level is audible to the human sense of hearing when the audio signal is played back; and
Specification