Patent ID: 8676364

Claim:
An apparatus for synchronizing multichannel extension data with an audio signal comprising block division information, wherein reference audio signal fingerprint information is associated with the multichannel extension data, comprising: a block detector arranged to detect the block division information in the audio signal; a fingerprint calculator arranged to calculate one fingerprint per block of the audio signal for a plurality of subsequent blocks in order to acquire a sequence of test audio signal fingerprints, wherein the fingerprint calculator is arranged to use the block division information to calculate the sequence of test audio signal fingerprints; a fingerprint extractor arranged to extract a sequence of reference audio signal fingerprints from the reference audio signal fingerprint information associated with the multichannel extension data; a fingerprint correlator arranged to correlate the sequence of test audio signal fingerprints and the sequence of reference audio signal fingerprints; and a compensator arranged to reduce or eliminate a time offset between the multichannel extension data and the audio signal based on a correlation result; wherein the block division information includes a watermark embedded into the audio signal; the block detector includes a watermark extractor arranged to detect the watermark in the audio signal; the watermark is embedded into a block of the audio signal, such that the watermark is repeated in subsequent blocks of the audio signal; the block detector is arranged to calculate a correlation between a known noise sequence and the audio signal based on a test block division across several blocks; and the block detector includes a control block that is arranged to detect a correlation peak in a result of the correlation indicating an offset in samples of an original block division to the test block division.