Low-pass Differentiators

Optimized IIR Low-pass Differentiators

Post Title

Introduction

In many signal processing applications, such as airborne laser bathymetry, Doppler radar, EEG and EOG, differentiation is followed by low-pass filtering; differentiation is used to extract information about sharp transients in the signal while low-pass filtering is used to reject high frequency noises. In this project, we introduced several optimized IIR low-pass differentiators (LPD) with an almost linear phase in the pass-band. The proposed LPDs can approximate high-order Parks-McClellan FIR LPDs with a good level of accuracy.


Software

  • Prototyped in MATLAB (Genetic Algorithms Toolbox, Filter Design and Implementation Tool (FDATool))
  • Implemented on Texas Instruments TMS320C6416 DSP
  • Firmware written in C.

Related publications

1
ICSAP
A. Tahmasbi and S. B. Shokouhi, "New approach for approximating Parks McClellan low-pass differentiators," in Proc. IEEE, Int. Conf. on Signal Acquisition and Processing (ICSAP'2010), Bangalore, India, 2010, pp. 188-192.
2
ICSAP
A. Tahmasbi and S. B. Shokouhi, "New optimized IIR low-pass differentiators," in Proc. IEEE, Int. Conf. on Signal Acquisition and Processing (ICSAP'2010), Bangalore, India, 2010, pp. 205-209.

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