Patent ID: 7702408

Claim:
A system comprising: a loudspeaker, wherein the loudspeaker comprises a coil having a plurality of separate windings, wherein each of the plurality of separate windings is coupled to a distinct bit of an incoming digital audio signal, and wherein each progressively more significant bit within the digital audio signal is coupled to a winding having progressively more turns; a first system to generate a representation of audio material and to provide the representation of the audio material to the loudspeaker using the digital audio signal, wherein the first system is configured to not provide the loudspeaker with the representation of the audio material if an authorization signal indicates that the loudspeaker is not authorized to play the audio material, and wherein the first system generates the authorization signal by executing an algorithm having inputs comprising an identity of the loudspeaker, a characteristic of a speaker system that comprises the loudspeaker, an identity or characteristic of a human operator, an identity or characteristic of audio material to be played by the loudspeaker and a time; and a second system to receive a representation of audio material played, and store the received representation as data.