System and method to prevent audio watermark detection
US8522032B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 2010 |
| Grant date | Aug 27, 2013 |
| Priority date | — |
| Expiry date | Apr 9, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/018
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A system to prevent audio watermark detection includes content having a video portion and an audio portion, the audio portion having a watermark, an audio/video separator configured to separate the video portion and the audio portion, and a random number generator configured to generate a random number corresponding to a shifted frequency. The system also includes a frequency shift element configured to apply the shifted frequency to the audio portion to alter a spectrum of the watermark so as to prevent detection of the watermark by a device seeking to recover the watermark. The system also includes an audio resampler configured to resample the audio portion to restore the audio portion to an original length, and an audio/video combiner configured to combine the video portion and the audio portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.