ferraus highpass

High-pass filter

Synopsis

ferraus highpass <input> [options] [-o <output>]

What it does

Removes content below --freq. --order 2 is 12 dB/oct; higher orders are Butterworth (6 dB/oct per order). --q shapes the corner of an order-2 filter (0.707 = flat Butterworth).

This command is also an fx stage and a pipeline op: ferraus fx in.wav -o out.wav --fx "highpass:key=value".

Examples

Remove rumble below 80 Hz

ferraus highpass vox.wav -o vox_hp.wav

Steep sub-sonic filter

ferraus highpass kick.wav --freq 30Hz --order 4 -o kick_clean.wav

Clear the low end for the bass, with a small bump at the corner

ferraus highpass guitar.wav --freq 120Hz --q 1.2 -o guitar_hp.wav

Remove desk thumps and air-conditioning rumble from a batch of recordings

ferraus highpass episodes/*.wav --freq 70Hz --outdir hp/

Options

Global options

Every command also accepts the global options (-o, --json, --dry-run, --overwrite, --progress, ...). See Global options.

Exit codes

Common mistakes

• Forgetting that outputs are never overwritten: pass --overwrite or a new -o path when re-running.

For models

• MCP tool: ferraus_highpass
• Schema: ferraus schema highpass
• Pipeline: { op: highpass, args: { ... } } (flag names with _ instead of -)
• fx stage: yes

{"command": "highpass", "defaults": {"freq": "80Hz", "order": "2", "q": "0.707", "mix": "100%"}}