Synchronous pulse generator including flywheel tank circuit with phase locked loop

Apparatus receiving a degraded synchronous pulse signal and supplying a corrected data pulse signal in which missing pulses have been replaced and phase shifted pulses have been properly positioned, comprising:

• a. a flywheel tank circuit whose resonant frequency varies responsive to a frequency control signal, which produces an oscillating output signal whose amplitude remains above a pre-selected value responsive to an in-phase substantially synchronous pulse train at a pulse train input and which decays to less than the predetermined value within a predetermined number of cycles upon cessation of the in-phase synchronous pulse train;
• b. a pulse detector receiving the degraded pulse signal and supplying a pulse to the pulse train input of the flywheel tank circuit at a selected time following each crossing of a pre-selected level in a pre-selected direction by the degraded data pulse signal;
• c. a threshold detector receiving the output of the flywheel tank circuit and producing the corrected data pulse signal having first and second values respectively as the flywheel tank circuit output signal is greater and less than a pre-selected value;
• d. a first one-shot receiving the pulse detector output, and having an on time substantially less than the shortest time between the start of adjacent pulses of the degraded data pulse signal;
• e. an exclusive OR circuit receiving as inputs the output of the first one-shot and the threshold detector;
• and
• f. a first integrator circuit receiving the exclusive OR circuit output and a second integrator circuit receiving the output of the first, and supplying its output to the flywheel tank circuit as the frequency control signal.