1. A noise reducing apparatus, comprising: a digital logic circuit which generates non-predictable noise; and a digital anti-circuit configured to generate non-predictable anti-noise to cancel at least a portion of the non-predictable noise generated by the digital logic circuit without sensing the non-predictable noise, wherein a circuit structure of the digital anti-circuit is configured to generate the non-predictable anti-noise in a direction substantially opposite the non-predictable noise.