A New Method of Synchronization for Television Systems

Line and frame scanning frequencies in an all-electronic television system need not be frozen to a standard giving limited definition performance if the synchronizing system is arranged so as to allow flexible operation. Automatic operation of receiver synchronizing circuits at variable line and frame frequencies is made possible with the aid of a new type of synchronizing wave-form. Synchronizing standards which permit both flexible and automatic operations are discussed. Transmitter synchronizing apparatus for flexible synchronizing standards, receiver circuits for both non-automatic and automatic synchronizing operation are also discussed, and a “transition” type receiver for operation on both old and new types of synchronizing signals is briefly described.