DIGITAL SIGNAL PROCESSING

You wrote a clean IIR filter. The MATLAB plot looked beautiful. You ported it to your DSP, microcontroller, or audio plugin, and the output exploded. Or it kept ringing softly even after you fed it silence. Or the high-Q notch you carefully tuned now sounds like a dying modem. An IIR filter becomes unstable when … Read more

If you have ever touched an EQ plugin, tuned a subwoofer, used a Web Audio API demo, or even worn a fitness tracker that smooths noisy heart-rate data, you have used a biquad filter. You just did not know it was called that. In , it is easily one of the most quietly influential tools … Read more