Patent ID: 7197368
Filing Date: 2007-03-27
Classification: G11B,H04H,H04N

Abstract:
1. An audio watermarking system comprising: a pattern generator configured to generate both a strong watermark and a weak watermark; and a watermark insertion unit configured to selectively insert the strong watermark into at least one segment of an audio signal and to selectively insert the weak watermark into at least one other segment of the audio signal, so that at least some resulting segments have either the strong or the weak watermark inserted therein, but not both, and wherein the watermark insertion unit further configures the segments of the audio signal to enable detection of the inserted strong and weak watermarks based on a randomized correlation measure, the randomized correlation measure having a first expected value when a corresponding one of the segments contains no strong or weak watermark, and having a second expected value when the corresponding one of the segments contains either the strong or weak watermark.