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Plotting DSP System Response Curve

Question asked by rsbonini on May 16, 2011
Latest reply on May 25, 2011 by BrettG

We're developing a solution for a client, of which one of the requirements is to be able to change the filter value settings and save the new response to the device.  The problem we're having is with plotting the curve in the user interface we're building.  For peaking filters the boost/cut level seems to vary with frequency.  We thought that this may have been an issue with our plotting method however simulated response curves in SigmaStudio demonstrate the same problem.  Is this frequency dependant response variation inherent of RBJ filters or, is it an issue with the algorithm used for drawing the response curve?

(The attached images show this problem clearly.  Note the filter settings at the bottom of each image.)