Patent ID: 6407599
Filing Date: 2002-06-18
Classification: B65H,G01N,G01R,G03G,H04N

Abstract:
A method for determining a phase shift in a signal comprising the steps of:a) sampling a reference signal for a low going edge; b) if a low going edge is detected go to step c), if a low going edge is not detected return to step a); c) initializing a counter; d) sampling said reference signal; e) if a high going edge on said reference signal is detected go to step f), if a high going edge is not detected return to step d); f) starting said counter; g) sampling a resulting signal; h) if said resulting signal is at a high level go to step i), if said resulting level is not at high level go to step o); i) sampling said resulting signal; j) if a low going edge on said resulting signal is detected go to step k), if not go to step i); k) sampling said resulting signal; l) if a high going edge on said resulting signal is detected go to step m), if not go to step k); m) stopping said counter; n) updating a counter register and go to step r); o) sampling said resulting signal; p) if is a high going edge on said resulting signal is detected go to step q), if not go to step o); q) stopping said counter; and r) converting said register value to phase difference.