http://www.usa.canon.com/cusa/semiconductor/products/encoder_optolectronic_components/interpolator_board_unit/ci_1000ga?pageKeyCode=writeReviewPage
CI-1000GA
3333332
Overview
Subjects analog output from encoders to mathematical operations and synthesis, achieving even higher resolution and accuracy. Canon's Interpolator Series uses circuit structures and the analogue operation method, with the addition of a phase-difference correction circuit of input 2-phase sinusoidal curve. This was to attain a higher level of resolution and precision.