Echo Hiding

@inproceedings{Gruhl1996EchoH,
  title={Echo Hiding},
  author={Daniel Gruhl and Anthony Lu and Walter Bender},
  booktitle={Information Hiding},
  year={1996}
}
Homomorphic signal-processing techniques are used to place information imperceivably into audio data streams by the introduction of synthetic resonances in the form of closely-spaced echoes. These echoes can be used to place digital identi cation tags directly into an audio signal with minimal objectionable degradation of the original signal. 
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