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GAUSSIAN LOW PASS FILTER

Platform : DSP

IEEE Projects Years : 1998

This paper appears in: Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on Issue Date: 31 May-3 Jun 1998 AIM: Design and Implementation of Gaussian low pass filter. ABSTRACT We have developed a method for approximating a Gaussian decay low-pass filter using subthreshold CMOS VLSI circuits. The time constant (or σ) of the delay is adjustable over several orders of magnitude and the DC gain is guaranteed to be unity. Since the design is compact and straightforward, the proposed circuit can be used as a building block that can replace first-order low-pass filters in many situations. Gaussian decay circuits have applications in temporal preprocessing for neural networks, demodulation in communication, and auditory sound localization. We also believe that the Gaussian decay function may be superior to other time-delay elements in adaptive filter implementations LEARNING OBJECTIVE: Gaussian low pass filter approximation. INPUT: Original speech utterance with added noise signal OUTPUT : Original speech utterance APPLICATIONS: Speech signal processing SOFTWARE TOOL USED: MATLAB 2007A

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