Patent ID: 7500155

Claim:
A method comprising: detecting a first signal characterized by a periodically occurring first event; detecting a second signal characterized by a periodically occurring second event; and based on both the detected first and second signals, generating a third signal characterized by a periodically occurring third event, wherein generating the third signal involves automatically adjusting the phase of the third signal to position the periodically occurring third event at a predetermined location between the first and second events of the detected first and second signals, wherein generating the third signal comprises: generating a periodic reference signal that has rising edges established by the first signal and falling edges established by the second signal; delaying the first signal by a selectable amount to generate a fourth signal; generating a periodic calibration signal that has rising edges established by the first signal and falling edges established by the fourth signal; and using the reference signal and the calibration signal to adjust the selectable amount of delay to position the periodically occurring third event at the predetermined location between the first and second events of the first and second signals.