Abstract: A computer system in which augmentation content can be provided to a client device. A receiver is provided in a server for receiving a live television signal. A matching engine can then identify a segment of television, based on fingerprinting techniques and can determine a time delay between the start time of the segment of television and its identification. A content retrieval unit can then select augmentation content based on the identified segment of television and the time delay, and this can be output to a client device. In this way the augmentation content can be selected so that it maintains synchronization with live television.

Abstract: A computer system is disclosed in which features can be identified in a live television signal. A keyword extractor is arranged to identify keywords in the received television signal or to identify characteristic features in the signal. A content retrieval unit can then retrieve additional content that is related to selected keywords. An output unit can output keywords initially in an expanded format which may include the keyword and the retrieved additional content. The keywords are then displayed in a contracted format after a predetermined period of time has elapsed in order to make space on for newer keywords in the expanded format.

Abstract: A computer system in which augmentation content can be provided to a client device. A receiver is provided in a server for receiving a live television signal. A matching engine can then identify a segment of television, based on fingerprinting techniques and can determine a time delay between the start time of the segment of television and its identification. A content retrieval unit can then select augmentation content based on the identified segment of television and the time delay, and this can be output to a client device. In this way the augmentation content can be selected so that it maintains synchronisation with live television.