Measuring and computing an FIR filter's frequency response

Filter Input

Order M

Frequency f₀ (Hz)

Show H(e^iω̂)

Difference equation Impulse response At f₀

Measure always sends a sinusoid of amplitude 1 at f₀ through the filter, whatever input is shown above, and reads the output amplitude from its RMS level after the first M samples. The tick marks under the slider are at 200, 800, 1600, 2400 and 3200 Hz. Listen plays the input, then the output.