title: A Low Cost VLSI Architecture for Spike Sorting Based on Feature Extraction with Peak Search.
abstract: The goal of this paper is to present a novel VLSI architecture for spike sorting with high classification accuracy, low area costs and low power consumption. A novel feature extraction algorithm with low computational complexities is proposed for the design of the architecture. In the feature extraction algorithm, a spike is separated into two portions based on its peak value. The area of each portion is then used as a feature. The algorithm is simple to implement and less susceptible to noise interference. Based on the algorithm, a novel architecture capable of identifying peak values and computing spike areas concurrently is proposed. To further accelerate the computation, a spike can be divided into a number of segments for the local feature computation. The local features are subsequently merged with the global ones by a simple hardware circuit. The architecture can also be easily operated in conjunction with the circuits for commonly-used spike detection algorithms, such as the Non-linear Energy Operator (NEO). The architecture has been implemented by an Application-Specific Integrated Circuit (ASIC) with 90-nm technology. Comparisons to the existing works show that the proposed architecture is well suited for real-time multi-channel spike detection and feature extraction requiring low hardware area costs, low power consumption and high classification accuracy.
authors.affiliation: Department of Computer Science and Information Engineering, National Taiwan Normal University, Taipei 117, Taiwan. 60347009s@ntnu.edu.tw.
authors.forename: Yuan-Jyun
authors.initials: YJ
authors.lastname: Chang
authors.affiliation: Department of Computer Science and Information Engineering, National Taiwan Normal University, Taipei 117, Taiwan. whwang@csie.ntnu.edu.tw.
authors.forename: Wen-Jyi
authors.initials: WJ
authors.lastname: Hwang
authors.affiliation: Department of Computer Science and Information Engineering, National Taiwan Normal University, Taipei 117, Taiwan. 60447062s@ntnu.edu.tw.
authors.forename: Chih-Chang
authors.initials: CC
authors.lastname: Chen
keywords: VLSI; brain machine interface; spike sorting