Patent ID: 6983051
Filing Date: 2006-01-03
Classification: G06Q,G06T,G07C,G07D,G07F,G10L,G11B,H04B,H04N

Abstract:
1. A method of embedding multi-bit auxiliary data into an input audio signal that is thereafter compressed to yield a compressed signal, and thereafter discerning the multi-bit auxiliary data from a non-identical counterpart to said audio signal obtained by decompressing the compressed signal, the method comprising: providing an input audio signal representing a plurality of sequential series of audio data, each series comprising a plurality of samples, each sample having a value associated therewith; for each of a plurality of samples in a series, transforming the value thereof in accordance with at least some of said multi-bit auxiliary data, wherein an encoded series of audio data is produced having the auxiliary data embedded therein; repeating the foregoing transformation for a plurality of different series of said audio signal, thereby yielding a first encoded audio signal in which the auxiliary data is redundantly encoded through different temporal excerpts thereof; compressing the first encoded audio signal; decompressing the compressed, first encoded audio signal to produce a second encoded audio signal, said second encoded audio signal being non-identical to the first due to said compression/decompression process; and discerning the multi-bit auxiliary data from the second encoded audio signal without reference to the input audio signal.