16. An apparatus for synchronising a device with an audio signal having encoded pairs of code words embedded separately therein, each pair of code words including an ID code word and a synchronisation code word, the method comprising: a receiver configured to receive the audio signal with the encoded pairs of code words 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; and a synchronisation controller configured to synchronise the device with the received audio signal by detecting: i) an ID code word and a synchronisation code word from one pair of code words; or ii) an ID code word from one pair of code words and a synchronisation code word from another pair of code words.
16. An apparatus for synchronising a device with an audio signal having encoded pairs of code words embedded separately therein, each pair of code words including an ID code word and a synchronisation code word, the method comprising: a receiver configured to receive the audio signal with the encoded pairs of code words 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; and a synchronisation controller configured to synchronise the device with the received audio signal by detecting: i) an ID code word and a synchronisation code word from one pair of code words; or ii) an ID code word from one pair of code words and a synchronisation code word from another pair of code words. 20. The apparatus according to claim 16 , comprising a microphone for receiving an acoustic signal and wherein the receiver is configured to receive an audio signal obtained from the microphone.