Debabrata Mohapatra

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Low power is an imperative requirement for portable multimedia devices employing various signal processing algorithms and architectures. In most multimedia applications, human beings can gather useful information from slightly erroneous outputs. Therefore, we do not need to produce exactly correct numerical outputs. Previous research in this context(More)
Low-power is an imperative requirement for portable multimedia devices employing various signal processing algorithms and architectures. In most multimedia applications, the final output is interpreted by human senses, which are not perfect. This fact obviates the need to produce exactly correct numerical outputs. Previous research in this context exploits(More)
In this paper we present a design methodology for algorithm/architecture co-design of a voltage-scalable, process variation aware motion estimator based on <i>significance driven computation</i>. The fundamental premise of our approach lies in the fact that all computations are not equally significant in shaping the output response of video systems. We use(More)
Algorithms from several interesting application domains exhibit the property of inherent resilience to "errors" from extrinsic or intrinsic sources, offering entirely new avenues for performance and power optimization by relaxing the conventional requirement of exact (numerical or Boolean) equivalence between the specification and hardware implementation. (More)
Approximate computing techniques that exploit the inherent resilience in algorithms through mechanisms such as voltage over-scaling (VOS) have gained significant interest. In this work, we focus on meta-functions that represent computational kernels commonly found in application domains that demonstrate significant inherent resilience, namely Multimedia,(More)
We present a voltage-scalable and process-variation resilient memory architecture, suitable for MPEG-4 video processors such that power dissipation can be traded for graceful degradation in "quality". The key innovation in our proposed work is a hybrid memory array, which is mixture of conventional 6T and 8T SRAM bit-cells. The fundamental premise of our(More)
In this paper, we propose a system level design approach considering voltage over-scaling (VOS) that achieves error resiliency using unequal error protection of different computation elements, while incurring minor quality degradation. Depending on user specifications and severity of process variations/channel noise, the degree of VOS in each block of the(More)