Data tracking clock recovery system using digitally controlled oscillator

Abstract From the Canadian patent

A clock recovery system according to the present disclosure includes a VCO responsive to a voltage signal for generating a clock signal. A phase detector includes a register and a PROM the, register counting the clock signal to derive the output clock signal. The PROM is responsive to input data and the count in the register to detect and store information concerning relative phase relationships. A counter contains a count from which the control voltage for the VCO is derived. The PROM is operable to alter the count in the counter, thereby performing frequency adjustments and to alter the count in the register to perform phase adjustments. Also a converter, operable by the phase detector …