Patent ID: 7512380
Filing Date: 2009-03-31
Classification: H03J,H04B,H04R

Abstract:
1. 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 out-of-band transmitter to transmit a channel selection signal comprising the available non-interfering carrier frequency.