Patent ID: 7719558

Claim:
An apparatus comprising: a detector to: detect a laser beam reflected off of a rotating multi-facet mirror in a printer, and responsively generate a plurality of rotation signals, each rotation signal of the plurality of rotation signals having a series of pulses, wherein each pulse in the series of pulses corresponds to the laser beam reflecting off of a respective facet of the rotating multi-facet mirror, and striking the detector; a circuit to generate a plurality of pseudo horizontal synchronization signals in response to receiving at least one of the plurality of rotation signals, each pseudo horizontal synchronization signal of the plurality of pseudo horizontal synchronization signals including a series of pseudo pulses based on the series of pulses, wherein the circuit generates the plurality of pseudo horizontal synchronization signals using time measurements between pulses in the series of pulses, at least one of the time measurements being based on a rotation signal directly preceding the at least one of the plurality of rotation signals; and an image processor communicatively linked to the circuit and operable to output image line data when the image processor detects a pulse in the series of pseudo pulses.