Is the Denon ASD-51 based on the Jupiter platform from Frontier Silicon?
Frontier Silicon, a leading supplier of digital radio technology, has announced that its new hardware/software solution announced today for low cost Internet radio receivers including AM/FM tabletop radios, networked iPod/MP3 docks and clock radios will allow consumer electronics (CE) manufacturers to provide products at affordable mass market price points of under US$149.99
Customers include Bang & Olufsen, Bose, Bush, Cyrus, Denon...http://www.newswiretoday.com/news/44756/
Frontier Silicon's Jupiter 6.2 with iPod authentication coprocessor and S/PDIF digital audio out:http://www.frontier-silicon.com/prod...jupiter6.2.htm
Apple's patent title: Method and system for authenticating an accessory:
Numerous third-parties have developed accessories for use with media players. An accessory may be used with the media player as long as a compatible connector or port is utilized. Accessories interact with the media player using an accessory protocol. One example of an accessory protocol is referred to as iPod Accessory Protocol (iAP), which is available from Apple Computer, Inc. of Cupertino, Calif. The accessory protocol includes commands which have been typically been made freely accessible to accessory developers. A problem with the commands being freely accessible is that they can be used by unauthorized or counterfeit accessory devices.
One solution is to perform authentication operations on an accessory device. Accordingly, the accessory devices would not have any access to the media player until after the authentication process is complete.http://www.freepatentsonline.com/y2007/0234420.html