Patent Document ID: 9792921
Application ID: 15336501

Base Claim:
1. A method of embedding code words into an audio signal, the method comprising: receiving pairs of code words, each pair of code words comprising an ID code word and a synchronisation code word, wherein the ID code words of all of the pairs for a given audio signal are the same and wherein each synchronization code word for the audio signal is unique; encoding the code words of each pair of code words separately to form encoded code word signals; receiving an audio signal; and combining the encoded code word signals with different portions of the received audio signal to form a modified audio signal that carries the pairs of code words distributed within the audio signal.

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Claim 4:
4. The method according to claim 1 , wherein the encoding step generates timing information associated with at least the synchronisation code word that identifies a point in time where the code word is encoded within the audio signal.