RECOVERY OF HIDDEN DATA EMBEDDED IN AN AUDIO SIGNAL AND DEVICE FOR DATA HIDING IN THE COMPRESSED DOMAIN

摘要

A cellular telephone is provided for recovering hidden data that is embedded within an input acoustic signal. The telephone passes the acoustic signal through an audio coder of the telephone and then processes the compressed audio generated by the audio coder, to recover the hidden data. A similar telephone is also provided for identifying the audio signal from the compressed output of the audio coder. Various coding techniques are also described for hiding the data within the audio.