Timing recovery circuit for digital data

Abstract From the Canadian patent

Abstract of the Disclosure, A timing recovery circuit receives a timing component signal and generates a signal having a frequency varying in response to a control signal. In response to a difference between the phase of the variable frequency signal and the phase of the timing component signal, the circuit produces a control component. In response to cycle slips between the variable frequency signal and the timing component signal the circuit, produces a series of pulses having a polarity related to the sense of the cycle slips and having a pulse rate directly related to the rate of the cycle slips except when amplitude of the timing component signal falls below a predetermined value …