Patent ID: 7512380

Claim:
A sound generation device comprising: an audio source to generate an audio signal; a frequency modulation (FM) radio frequency (RF) transmitter, coupled to the audio source, to transmit an FM carrier signal modulated with the audio signal, the FM carrier signal having a specific carrier frequency within the range of 87.7 to 107.9 megahertz that does not interfere with transmission frequencies in a commercial FM broadcast band of 87.7 to 107.9 megahertz in a geographical region in which the sound generation device is currently located; a channel locator controller to identify an available non-interfering carrier frequency, wherein the channel locator controller includes an RF receiver, coupled to the RF transmitter, to receive FM signals having different carrier frequencies; and a channel locator circuit, coupled to the RF receiver, to identify two or more bands of FM carrier frequencies below a minimum signal strength; wherein the channel locator controller is configured to identify an available non-interfering carrier frequency from an evaluation of the two or more bands of FM carrier frequencies; and an out-of-band transmitter to transmit a channel selection signal comprising the available non-interfering carrier frequency.