Robust watermark for DSD signals
US7325131B2 · kind B2 · utility
5Cited by
24References
8Claims
0Family size
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Key dates
| Filing date | Sep 5, 2002 |
| Grant date | Jan 29, 2008 |
| Priority date | — |
| Expiry date | Nov 11, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10527
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A robust watermark embedded into a Direct Stream Digital (DSD) audio signal including a flat frequency response in a specific frequency range which does not extend below 20 kHz or above 100 kHz. The watermark is therefore hidden in the noise spectrum of the DSD signal, such that the watermark is inaudible to a listener. Since the noise spectrum contains important information that helps provide the DSD signals with sharp transients and an accurate impulse response, the watermark cannot be removed from the DSD signal without causing significant degradation to the signal's audio quality.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.