Method to reduce stepper motor noise when reading CMC7 documents

The invention relates to document processing systems. More specifically, the invention concerns the reduction of stepper motor noise when reading CMC7 documents. A method reduces stepper motor noise in a MICR document waveform resulting from CMC7 information. The method includes the steps of creating a motor noise profile from the document waveform, and creating a working sample waveform from the document waveform. The method further includes the step of applying the motor noise profile to the working sample waveform to reduce stepper motor noise. The method also periodically realigns the motor noise profile with the working sample waveform. Thus, the invention allows reduction of stepper motor noise without requiring relocation of the motor or additional shielding.