High performance absolute value calculator based on stochastic computing

In this paper, we propose a Sliding Window Method (SWM) to calculate absolute value based on the stochastic computing. We prove that the absolute value of the stochastic stream can be obtained from the limiting distribution of the Markov chain by establishing a Markov model of SWM. The proposed schemes can be employed to both unipolar and bipolar stochastic streams. The simulation and design reports show that the hardware efficiency of the proposed stochastic absolute value calculator is as four times as existing methods.