Andor Bariska (@an2or)

Andor Bariska works as researcher, project manager and consultant on Technical Systems and Signal Processing at the Institute of Data Analysis and Process Design of the Zurich University of Applied Sciences. He is experienced in algorithm development for signal processing systems and successfully completing advanced software and research projects.

Time Machine, Anyone?

Andor Bariska ● March 7, 2008●6 comments

Causal filters can look like time machines, but they do not break physics. Andor Bariska reproduces a classic electronic experiment in MATLAB, showing how a minimum-phase peaking filter and its FDLS biquad approximation produce negative group delay bands that make predictable, bandlimited signals appear to emerge early. The post walks through group delay, discretization, pulse and random-signal tests, and why unpredictability restores causality.

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