Abstract: A multi-channel audio messaging system for cable television, installed at the headend, enables multiple different input audio messages to be supplied to multiple different channels of a cable television system. Multiple analog audio input message sources are supplied as a multiplexed audio input to a digitizer which outputs digitized audio signals which are switched and decoded, under the control of a microprocessor to provide different audio messages on desired channels.

Abstract: A cable television video messaging system for selectively overlaying or substituting a desired input message, for example an Emergency Broadcast System warning, onto multiple channels of a cable television system having a headend system where multiple external program signals are channelized by means of individual channel modulators. This achieved by a digital microprocessor powered message-management unit programmed to talk to a network of channel message units, one for each channel. Preferably the channel message units are also microprocessor powered and include character generator and channel synchronizer chips. General supervision of a cable television system's analog domain program distribution system by digital means is also possible.