发明名称 |
Coding process for inserting an inaudible data signal into an audio signal, decoding process, coder and decoder |
摘要 |
In a coding method and a coder for introducing a non-audible data signal into an audio signal, the audio signal is first transformed to a spectral range and the masking threshold of the audio signal is determined. A pseudo-noise signal and a data signal are provided and multiplied with each other so a to provide a frequency-spread data signal. The spread data signal is weighted with the masking threshold, and thereafter the audio signal and the weighted data signal are superimposed. In a method and a decoder for decoding a data signal introduced into an audio signal in non-audible manner, the audio signal is first sampled and thereafter the sampled audio signal is filtered in non-recursive manner. The filtered audio signal is subsequently compared to a threshold value so as to retrieve the data signal.
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申请公布号 |
US6584138(B1) |
申请公布日期 |
2003.06.24 |
申请号 |
US19980142325 |
申请日期 |
1998.10.05 |
申请人 |
FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V. |
发明人 |
NEUBAUER CHRISTIAN;EBERLEIN ERNST;PLANKENBUEHLER ROLAND;HEUBERGER ALBERT;GERHAEUSER HEINZ;PERTHOLD RAINER;SCHOTT HARTMUT |
分类号 |
H04H20/31;(IPC1-7):H04B15/00;H04K1/00;H04L27/30 |
主分类号 |
H04H20/31 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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