Patent ID: 6526385
Filing Date: 2003-02-25
Classification: G10L,G11B,H04H

Abstract:
A system for embedding additional information in audio data, comprising:(a) means for transforming said audio data into frequency components including means for dividing audio data to multiple frames consisting of multiple audio samples, and for transforming audio data in said frames; (b) means, based on said audio data, for determining levels of modification for each frequency component within which said additional information can be embedded is for analyzing frequency component distribution of said transformed audio data to determine said levels of modification for each frequency component that are aurally imperceptible to human beings; (c) means for generating a mask to use for embedding said additional information; (d) means for employing said mask to be fit within the modification levels determined for said transformed audio data, and for adding the pattern to said transformed audio data wherein said embedding mask is a pseudo-random vector that is produced from a pseudo-random number generated by a pseudo-random number generator, and that defines a manipulation direction for each frequency component; and (e) means for, to obtain audio data, performing inverse transformation for said modified audio data in which said additional information has been embedded.