Acoustic communication system

摘要

A toy system is described in which a data signal is encoded using spread spectrum technology to form a spread signal which is combined with an audio track to form a modified audio track. The modified audio track is then transmitted as an acoustic signal to a toy having an electro-acoustic transducer for converting the acoustic signal into an electrical signal which is then despread in order to regenerate the data signal, and the toy responds to the data signal. By using spread spectrum technology to spread the data signal over a wide frequency range, the spread signal in the modified audio track can be made virtually inaudible to a listener. The techniques described have relevance to acoustic communication systems other than toy systems.