Fuente: Wipo "digitalization" A digital self-calibrating delay line is disclosed wherein in a chain of individual but identical time delay elements (40) a calibrated signal running therethrough is compared with the subsequent input signal on each of the individual time delay elements (40) until a coincidence time delay element is determined at which time an output is indicated. Prior to or upon the appearance of the signal to be delayed, the calibration signal is removed and the incoming signal inserted into the time delay chain to output at the individual time delay element determined by the calibration signal. In an alternate embodiment, by the addition of a few components to each of the time delay elements, the subject invention is interconnected to output a signal whose frequency is a multiple of the input signal.