NON-DUPLICATION SWITCHING ARRANGEMENT FOR CABLE TELEVISION TRANSMISSION

摘要

A non-duplication switching arrangement for a cable television system comprises cards that are provided with computer-formed punch holes to correspond to the time periods when the same programs are to be presented on different channels. The cards are mounted in carriers which are loaded into a holder. The carriers with the cards are withdrawn successively from the holder and pass through a photoelectric readout arrangement which detects the presence of the holes and operates relays at the headend equipment to delete the particular channel from transmission over the cable during the time periods at which the holes are detected.