SUBSCRIPTION TELEVISION CODING/DECODING SYSTEM

A method of coding and decoding video signals includes suppressing synchronization pulses during the video horizontal and vertical blanking intervals by gates 16 and 22 and inserting clock and address information in the suppressed intervals by a line modulator (36) and an address gate (44) respectively. Digital sound information may be inserted in the suppressed horizontal blanking intervals by a gate (30). At the receiver the unsynchronized video and the clock information are detected by a video detector and the clock is used to control a sync pulse generator to provide the sync pulses which are then recombined with the unsynchronized video. The digital sound information is used to provide program audio which is then combined with the above-described video signal to provide a television signal useable in a receiver.