Abstract: An asynchronous digital delay line is disclosed for delaying amplitude limited frequency modulated impulses of predetermined constant short duration carrying information on the leading edges. The delay line includes a plurality of digital gates connected in cascade to form a tandem array wherein each gate provides a known increment of delay and at least one of the gates is part of a pulse restoring circuit which regeneratively restores the impulses passing through the line to their original predetermined constant short duration.

Abstract: A time base error corrector for correcting time base errors in recurrent information such as horizontal lines of a video signal by random selection of a delay line tap is disclosed. Incoming recurrent information groups are converted into impulse trains, in which the information is carried on the leading edges of the impulses, which are passed asynchronously through a delay line of plural cascaded digital gates having propagation delays which provide known tapped increments of delay as well as providing regeneration of each impulse passing therethrough. A digital counter is clocked at a rate corresponding to said delay increments and counts the time base error of a train as it counts down the taps of said line. The total reached in counting the time base error determines the tap through which the impulse train is output from the delay line. A restoration circuit then restores the original signal format to the corrected information group.