Method and Apparatus for Correlating Two Data Sections
AssigneeThomson Licensing
InventorsPeter Georg Baum, Walter Voessing, Michael Arnold
Life of this patent
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Abstract
Watermarking of audio signals intends to manipulate the audio signal in a way that the changes in the audio content cannot be recognised by the human auditory system. The watermark data are decoded from the received watermarked audio signal by correlation with corresponding candidate reference sequences. One or more of the sync symbols are embedded twice in the watermark data frame in the encoder. Thereafter a circular correlation is calculated instead of a standard correlation.
Claims6
1-5. (canceled)
Method for correlating part of a received data frame containing at least one data signal section having a given length N with a reference data section having said given length N, whereby said at least one data signal section is arranged at least two times in a successive manner in said data frame, said method comprising the steps:
- using a circular correlation, correlating said reference data section with at least a second part of a first received one of said successive data signal sections and with a corresponding first part of the repeated data signal section following said first received one data signal section;
- depending on whether or not the resulting correlation value is greater than a pre-determined threshold value or smaller or equal than the negative value of said pre-determined threshold value, assigning to said correlation value either a first bit value or a second bit value different from said first bit value.
Apparatus for correlating part of a received data frame containing at least one data signal section having a given length N with a reference data section having said given length N, whereby said at least one data signal section is arranged at least two times in a successive manner in said data frame, said apparatus comprising:
- means for correlating, using a circular correlation, said reference data section with at least a second part of a first received one of said successive data signal sections and with a corresponding first part of the repeated data signal section following said first received one data signal section;
- means for assigning to said correlation value either a first bit value or a second bit value different from said first bit value depending on whether or not the resulting correlation value is greater than a pre-determined threshold value or smaller or equal than the negative value of said pre-determined threshold value.
Dependencies are inferred from the claim text.