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    • 8. 发明申请
    • REMOTE CONTROL SIGNALING USING AUDIO WATERMARKS
    • 使用音频水印遥控信号
    • WO0161987A3
    • 2002-01-24
    • PCT/US0140013
    • 2001-02-01
    • VERANCE CORPPETROVIC RADEWINOGRAD JOSEPH M
    • PETROVIC RADEWINOGRAD JOSEPH M
    • H04B11/00G08B5/22
    • G08C23/02G06F7/00G06Q30/0264G10L19/018H04B11/00
    • A system for using a watermark embedded in an audio signal to remotely control a device (290). Various devices such as toys, computers, and appliances, equipped with an appropriate detector (292), detect the hidden signals, which can trigger an action, or change a state of the device. The watermarks can be used with a "time gate" device, where detection of the watermark opens a time interval within which a user is allowed to perform an action, such as pressing a button, typing in an answer, turning a key in a lock, etc. To prevent fraudulent activation of a time gate, the time gate device can be configured to react only to watermarks coming from live broadcasts, and not from replays from tapes or other storage devices. In another feature, robustness of the watermark is improved, e.g., for acoustic propagation channels, by shifting the detection time of the watermark based on a measured bit error count of the watermark. Furthermore, the watermark may be inserted before the desired action along with corresponding offset information if the audio signal is not suitable at the time of the action.
    • 一种用于使用嵌入在音频信号中的水印远程控制设备的系统(290)。 配备有适当的检测器(292)的诸如玩具,计算机和电器的各种装置检测可触发动作的隐藏信号或改变装置的状态。 水印可以与“时间门”设备一起使用,其中水印的检测打开用户被允许执行动作的时间间隔,诸如按下按钮,输入答案,将键转动到锁定中 等等。为了防止时间门的欺骗性激活,时间门装置可以被配置为仅响应来自实时广播的水印,而不是来自磁带或其他存储设备的重放。 在另一个特征中,通过基于水印的测量比特误差计数来移动水印的检测时间,改善了水印的鲁棒性,例如对于声传播信道。 此外,如果音频信号在动作时不适合,则可以在期望的动作之前插入水印以及对应的偏移信息。