BSPII-ch3-filtering-time-2008

Blent ylmaz b bme402 biomedical signal processing ii

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Signal Processing-II Processing- 20 10 Derivative-based operators to remove low-frequency artifacts • Derivative operator in time-domain – Removes parts that are constant – Large changes in the input -> high values in the output • Boost HF components and suppress LF components Dr. Bülent Yılmaz Bü BME402: Biomedical Signal Processing-II Processing- 21 Derivative operator • d/dt -> multiplication by jw or j2*pi*f • Gain of the freq response, H(w)=jw – starts with 0 and increases linearly • Second-order derivative operator d2/dt2 – H(w) = -w2 – Quadratic increase in gain for HF components Dr. Bülent Yılmaz Bü BME402: Biomedical Signal Processing-II Processing- 22 11 First-order difference operator • y[n]=(1/T) [x[n]-x[n-1]] [x[n]- x[n• H(z)=(1/T) [1-z-1] [1• H(w)=(1/T) exp( -jw/2) exp( jw/2) • • [2j*sin(w/2)] |H(w)|=(2/T) |sin(w/2)| Phase = pi/2 – w/2 • HF noise will be amplified – Noise-amplification Noiseproblem Dr. Bülent Yılmaz Bü BME4...
View Full Document

This note was uploaded on 06/11/2012 for the course ENG 411 taught by Professor Cca during the Spring '12 term at Istanbul Universitesi.

Ask a homework question - tutors are online