Power-Efficient Reconfigurable FRM Filter-Bank using Brent Kung Adder for Hearing Aids
Keywords:
Distributed Arithmetic, FPGA, Frequency Response Masking, Han-Carlson Adder, Kogg-Stone Adder, Ladner-Fischer Adder, Parallel Prefix AddersAbstract
Efficient power usage is a key design criterion for hearing aids as they are battery-powered devices. Low power consumption of hearing aid leads to longer battery life, and smaller and lighter battery without compromising the operation time and improving the convenience and overall satisfaction of hearing impaired. To further improvise the user experience and comfort, filter banks which are reconfigurable in nature are used in hearing aids making them more customized and flexible to varying hearing profiles of patients. Thus, reconfigurability with efficient power utilization is the key filterbank requirement in hearing aid. The paper presents a design of a power-efficient reconfigurable Frequency Response Masking(FRM) Filter bank for hearing aid. The Distributed arithmetic technique is employed to generate distributed RAM partial product generators which are then accumulated using adders. For fast and power-efficient operation, Parallel Prefix Adder (PPA) is chosen against sequential adders. In this paper, four types of PPA viz. Kogge-Stone Adder (KSA), Brent Kung Adder (BKA), Han-Carlson Adder (HCA) and Ladner-Fischer Adder (LFA) are designed and compared for their power and resource utilization. Further, filter banks are designed using all four adders as part of their processing unit using Verilog HDL in Xilinx Vivado 2018 and implemented in Kintex 7 FPGA Genesys 2 board. Experimental results confirm that the reconfigurable filter bank designed using Brent Kung adder has the least power requirement amongst all four PPA-based filter designs and consumes 39.74% lesser power compared to the existing reconfigurable filter design using Carry Bypass adder.
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