Interpolation method and apparatus for increasing the resolution of coders

摘要

It discloses a method for interpolating an encoded signal from coders. The first step, a generating four only stages signals with a first frequency, the 45 degrees out of phase, contain. The four signals can then be multiplied in order to obtain a plurality of second stages signals, the 90 degrees out of phase, and a second frequency, the twice the first frequency is. The second stages signals can then pass through a further calculation, for obtaining a plurality of third stages signals, the 45 degrees out of phase are. The three stages signals can be further adapted for a further multiplication for obtaining higher degrees of interpolation. Interpolators and optical encoder characterized by the interpolation ability are likewise discloses.