ferraus generate noise

Generate white, pink, or brown noise

Synopsis

ferraus generate noise [options]

What it does

Writes Gaussian noise: white (flat), pink (-3 dB per octave, Kellet filter), or brown (-6 dB per octave, leaky integrator), scaled to an exact RMS level. Each channel gets independent noise. --seed makes it reproducible. Without -o the file is noise.wav in the current directory.

Examples

Five seconds of pink noise at -18 dBFS RMS

ferraus generate noise --color pink -o pink.wav

Reproducible stereo brown noise

ferraus generate noise --color brown --dur 30s --channels 2 --seed 7 -o rumble.wav

A minute of quiet white noise, for example to test a noise gate or dehiss

ferraus generate noise --dur 60s --amplitude -30dB -o hiss.wav

Stereo pink noise at -20 dBFS RMS, the usual speaker-calibration signal

ferraus generate noise --color pink --dur 10s --amplitude -20dB --sample-rate 44100 --channels 2 -o calib.wav

Options

Global options

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

Exit codes

Common mistakes

• Beat-based times (4b, 1/4) need a tempo: pass --bpm or write 4b@120.
• Gains need a unit when not in dB: 0.5x is a factor, -6 and -6dB are decibels.

For models

• MCP tool: ferraus_generate_noise
• Schema: ferraus schema generate noise
• Pipeline: { op: generate noise, args: { ... } } (flag names with _ instead of -)
• fx stage: no

{"command": "generate noise", "defaults": {"color": "white", "dur": "5s", "amplitude": "-18dB"}}