An Area and Power Efficient Adder-Based Stepwise Linear Interpolation for Digital Signal Processing

Abstract— Linear interpolation is frequently used in digital signal processing applications to reconstruct signals, e.g., image, and audio processing, for which the multiplier and divider are two power- and area-hungry operators. Since most natural world phenomena are not exactly representable in linear forms, it is inefficient to use multiplier-based linear interpolation (MBLI) for accurate linear curve fitting. In this
paper, area- and power-efficient adder-based stepwise linear interpolation (ABSI) is proposed to emulate the behavior of conventional linear interpolation. As a test vehicle for system demonstrations and performance evaluations, a general purpose display controller for applying an interpolationbased image/video scaling engine and overdrive for
multimedia displays such as televisions, monitors, and projectors, was designed. Compared with a scaling engine
using conventional MBLI, a scaling engine using the proposed ABSI has a similar scaling quality in terms of the peak signalto- noise ratio (PSNR), while reducing the area and power consumption by 45% and 44%, respectively. urthermore, as compared with the compression/decompression of an overdrive using conventional MBLI, the data
compression/decompression of the overdrive with the proposed ABSI shows a comparable compression/decompression quality while reducing the area and power consumption by 46% and 45%, respectively1.< final year projects >