Various signal processing methods and apparatus are provided. One claim recites a method of linking media to a network resource. The method includes: computing, with an electronic processor on a handheld device, attributes of media used to identify the media; providing, from the handheld device, computed attributes of the media to a network resource, wherein the network resource uses the computed attributes of the media to identify the media or metadata associated with the media; receiving, at the handheld device, metadata associated with the identified media in the network resource. Of course, other combinations and claims are provided as well.