Possibly; I've gotta admit, I can't seem to find much data on Philips or Admiral at all, but anything I can feed into the various search engines on the net can't hurt.

And, as has been recently mentioned, you can pull codes right off of existing remotes. The LIRC server has that ability (when running on a PC with an IR receiver), and I think you can get the codes off of some types of "learning" universal remotes too. So there's always some way to do it, with enough effort...