28. Method according to claim 26 , wherein said correlation basis being defined in a first frequency range and said obtaining of said correlation signal comprises: providing a correlation basis comprising all frequencies of said set of code bases within a first frequency range of a plurality of frequency ranges; mapping said correlation basis into each frequency range of a plurality of frequency ranges, said plurality of frequency ranges forming a total frequency range being applicable to said user provided audio information to obtain said modulation signal; and obtaining said correlation signal from said user provided audio information by convoluting said modulation signal and said user provided audio information in said frequency domain.
26. Method according to claim 25 , wherein said applying comprises: obtaining a modulation signal from said correlation basis; obtaining a correlation signal from said user provided audio information by convoluting said modulation signal and said user provided audio information having embedded said meta-information in a frequency domain; extracting magnitude signal values from said correlation signal, said magnitude signal values corresponding to each code basis of said set of code bases; and evaluating said magnitude signal values to retrieve said meta-information from said user provided audio information.