A digital audio gateway device for use in a wireless network of digital audio playback devices. The gateway device is wirelessly linked to one or more digital audio playback devices to provide a gateway to the Internet for the digital audio playback devices. In addition to functioning as a gateway, the...http://www.google.es/patents/US7890661?utm_source=gb-gplus-sharePatente US7890661 - Proximity synchronizing audio gateway device
