Consumer audio appliance responsive to watermark data
First Claim
Patent Images
1. An audio appliance responsive to a control signal steganographically embedded in audio information to limit use of the appliance, the control signal taking the form of a low level noise-like signal that has been summed with the audio information, the noise signal encoding the control signal, the control signal being repeated throughout the audio information and being represented differently in the audio information according to a key.
7 Assignments
0 Petitions
Accused Products
Abstract
A consumer audio device decodes auxiliary control data that is hidden in audio information. The auxiliary control information can be used to trigger some response in the device, such as enabling or disabling certain operations.
607 Citations
9 Claims
-
1. An audio appliance responsive to a control signal steganographically embedded in audio information to limit use of the appliance, the control signal taking the form of a low level noise-like signal that has been summed with the audio information, the noise signal encoding the control signal, the control signal being repeated throughout the audio information and being represented differently in the audio information according to a key.
- 2. An audio appliance responsive to a control signal steganographically embedded in audio information to limit use of the appliance, the control signal being detected by a correlation detector in the appliance, the correlation detector receiving as one input a noise-like reference signal, the control signal being repeated throughout the audio information and being represented differently in the audio information according to a key.
- 5. An audio monitoring device responsive to a control signal steganographically embedded in audio information, the control signal taking the form of an auxiliary signal derived in part from the audio information that has been summed with the audio information, the monitoring device measuring statistical characteristics of corresponding segments of audio samples of the audio information, estimating from the measure of the statistical characteristic for each segment an embedded symbol corresponding to the measure of the statistical characteristic for the segment.
Specification