Filter Phase Visualizer

Interactive demonstration of Group Delay and Phase Distortion in FIR vs IIR filters.

Filter Settings

Filter Phase Type

Base Time Delay (0.5 ms)

Adjust to see how the filter delays the signal in time.

Animate Waveform

FIR: Linear Phase

In a Linear Phase filter, the phase shift is directly proportional to the frequency ($\phi = -k\omega$). This means all frequency components are delayed by the exact same amount of time (constant Group Delay).

Result: The output waveform's shape is perfectly preserved, just shifted in time. Crucial for audio, ECG/EEG, and data transmission.

1. Input Signal (Composite Wave)

2. Output Signal (Filtered)

3. Output Components Breakdown

Observe how the peaks align (or misalign)