Abstract: A multi-channel video message display system that includes a single controller with plurality of channel modules, one for each channel and utilizes a single character generator at a broadcast or rebroadcast source that places alpha numeric or symbolic messages on a single or multiple non-synchronous television channels, where the synchronization pulses of a video input that are passed to the various channels are never replaced by externally generated signals. Horizontal drive sync pulses as are present in a television video signal are utilized as the driving pulses for the output of each channel module and character information is inserted into the channel modules by switching from the video signal input to the pixel digital input only during times when the trace is visible on a television screen.

Abstract: Disclosed is a method and apparatus for selectively distributing on a multiple channel television system information previously transmitted and received in the Baudot code. The transmitted information is encoded into a sequence of Baudot characters to include a combination of figure shift and/or letter shift characters which identifies the category or type of information contained in the sequence. Upon receipt, the sequence is decoded to determine the category of information contained therein and then the information is applied to one of a plurality of storage areas in memory, with the particular storage area selected being dependent upon the determination of the information category. After an information sequence has been received, decoded and stored in one of the storage areas, it is then applied to one or more selected channels of the multiple channel television system for display on television receivers tuned to those selected channels.