1. A consumer electronic device ( 1 ), comprising: an output means ( 3 , 5 , 7 ) able to generate a human perceptual signal ( 49 ); a transmitter ( 21 ) able to transmit a human non-perceptual signal ( 53 ); and a control unit ( 23 ) able to control the output means ( 3 , 5 , 7 ), able to create a representation ( 51 ) of the human perceptual signal ( 49 ), and able to instruct the transmitter ( 21 ) to broadcast a human non-perceptual signal ( 53 ) comprising the representation ( 51 ).