I encountered a post by Ryan Paul describing a Google research project. As I understand the post, Google researchers have been able to capture audio from a television program, analyze the audio, and use the information gained from the analysis to suggest web links a viewer might investigate to gain more information associated with the topics covered on the television program. Again, if I understand the technology, the technique identifies the show from the pattern of the input (it does not actually understand the text) and then provides links matched to a database of programs identified by pattern fingerprints.