INTERACTIVE TELEVISION TRANSMISSION SYSTEM

摘要

Interactive television transmission system including a television transmitter (1) and at least one television receiver (3). Along with the television program (TV), the transmitter transmits operational signals (OP) defining actions to be taken by the receiver upon user participation. In accordance with the invention, the transmitter comprises means (15) for transmitting an indication signal (ID) to indicate that the television program is an interactive program, e.g. in a teletext packet 8/30. The receiver is arranged to receive and detect said indication signal and generate a perceptible indication (OSD) in response to said detection to inform the user about the type of program and activate the relevant processing circuitry (36).