Scheme for Relatively Low Power FM Transmissions

Short range FM signal transmission apparatus comprising a transmitter configured to transmit an FM radio signal, a transducer and an analyser, wherein the transducer is arranged to capture audio signals in the vicinity of the apparatus, the transmitter is arranged to vary the band of frequencies occupied by the FM radio signal and the analyser is arranged to detect in the captured audio signals the presence of information conveyed by said FM radio signal.

A radio telephone comprising a short range FM signal transmission apparatus, the short range FM signal transmission apparatus comprising a generator configured to generate a set of FM transmissions occupying separate bands of frequencies and an RF transmitter configured to transmit the transmissions simultaneously.