Data hiding via phase manipulation of audio signals
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United States of America Patent
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Oct 30, 2007
Grant Date -
Feb 10, 2005
app pub date -
Jun 18, 2004
filing date -
Jun 19, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Data are embedded in an audio signal for watermarking, steganography, or other purposes. The audio signal is divided into time frames. In each time frame, the relative phases of one or more frequency bands are shifted to represent the data to be embedded. In one embodiment, two frequency bands are selected according to a pseudo-random sequence, and their relative phase is shifted. In another embodiment, the phases of one or more overtones relative to the fundamental tone are quantized.
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