- 专利标题： Audio watermarking via correlation modification using an amplitude and a magnitude modification based on watermark data and to reduce distortion
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申请号： US16151671申请日： 2018-10-04
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公开(公告)号： US11244692B2公开(公告)日： 2022-02-08
- 发明人: Daniel W. Griffin
- 申请人： Digital Voice Systems, Inc.
- 申请人地址： US MA Westford
- 专利权人： Digital Voice Systems, Inc.
- 当前专利权人： Digital Voice Systems, Inc.
- 当前专利权人地址： US MA Westford
- 代理机构： Fish & Richardson P.C.
- 主分类号： G10L19/018
- IPC分类号： G10L19/018 ; G11B20/00 ; G10L19/00 ; G10L19/26 ; G10L25/21
摘要：
To convey information using an audio channel, an audio signal is modulated to produce a modulated signal by embedding additional information into the audio signal. Modulating the audio signal processing the audio signal to produce a set of filter responses; creating a delayed version of the filter responses; modifying the delayed version of the filter responses based on the additional information to produce an echo audio signal; and combining the audio signal and the echo audio signal to produce the modulated signal. Modulating the audio signal may involve employing a modulation strength, and a psychoacoustic model may be used to modify the modulation strength based on a comparison of a distortion of the modified audio signal relative to the audio signal and a target distortion.
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