Importance

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Abstract

In a conference system of the present invention, a terminal modulates a sound signal taken by a micro-phone which is connected to the terminal, a coordinate information signal which is designated using a digitizer, and a video signal. The terminal converts the modulated signals to an optical signal by frequency multiplexing, and send the optical signal to the central device of the system. After the central device receives the optical signal, the device separates and extracts a sound signal, a coordinate signal, and a video signal from the optical signal. Each of these separated signals is sent to a corresponding demodulating circuit to be demodulated, outputted as sound or an image afterwards. Further, the coordinate information signal is processed, for instance, as a command data from a conference attendant.

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First Claim