I'm very beginner in signal processing. I need to design a Chebyshev filter with 5th-order polynomial and 0.001%-allowed ripples by using matlab as I found in a paper. I'm filtering pressure data inside combustion engine. In matlab I've to define normalized passband edge frequency and peak-to-peak passband ripple. I don't know what did the paper's author mean by 0.001% allowed ripples?
Any help would be appreciated