FIR audio-filter designer

What it does

Design a low-pass or high-pass FIR filter, inspect frequency response and export coefficients.

How to use it

1. Choose sample rate, cutoff and odd tap count, then design and export the filter.
2. Processing stays in your browser. No upload or sign-up.

Example

48 kHz, 5 kHz cutoff and 101 taps produce 50 samples or 1.0417 ms group delay.

Methodology

A Hamming-windowed sinc is normalized at DC; high-pass uses spectral inversion. A 513-point discrete response shows magnitude with a −120 dB floor.

Limitations

8–192 kHz sample rate, cutoff below Nyquist, 3–1,001 odd taps. Finite transition width and ripple remain. No audio playback, microphone or file processing.

Automation

This tool runs in your browser. No upload API or MCP endpoint is available.