| Field | Value | Copy |
|---|---|---|
| {{ row.label }} | {{ row.value }} |
Colored noise is a random sound shaped across frequency to emphasize or soften parts of the spectrum. Many people talk about these soundscapes as white, pink, or brown noise, and the same idea extends to ambiences such as ocean, rain, fan, fire, and forest. You use them to mask distractions and build a steady acoustic floor that supports sleep, calm, and focused work without sudden spikes taking your attention away.
You provide a few ingredients and receive continuous stereo sound plus a live view of its spectrum. The ingredients are a preset, an overall level, left–right balance, short fades at the start and end, and optional gentle motion and equalization. The result is generated on the fly and shaped in real time by filters and slow modulation, so the texture adapts smoothly as you fine‑tune it.
For example, choose pink noise, set volume to 35 percent, keep pan centered, and add a 1.5 second fade‑in with a 2.0 second fade‑out. Add a sleep timer for 30 minutes to ramp down automatically just before the end. Interpretation stays simple: a steady hiss masks nearby activity and helps your brain settle. Keep levels modest and comfortable to avoid fatigue during long sessions.
Pick a color for the task: darker tilts feel warmer, brighter tilts feel crisper. Ambience presets add slow motion to a shaping filter so the texture breathes without looping. Equalization trims rumble or hiss to match your headphones or room, and balance helps favor one ear when sharing space. Fades keep starts and stops gentle, and the timer prevents unintended overnight playback.
At heart you are listening to a random signal being shaped in frequency. Two gentle shelves tilt the low and high ends, then a single “shape” filter (low‑pass, band‑pass, or high‑pass) defines the core texture while equalization refines edges. A slow low‑frequency oscillator (LFO) can modulate the shape filter’s cutoff for natural motion. Master level uses a perceptual curve so small adjustments near quiet feel smoother, and a sleep timer fades out before pausing.
The chart shows level in decibels relative to full scale (dBFS) versus frequency on a logarithmic axis. Smoothing controls visual steadiness only; it does not change audio. Presets set filter type, center or cutoff frequency, quality factor, and built‑in LFO rate and depth. Continuous controls include volume in percent, pan from left to right, fade durations in seconds, equalizer gains in decibels, a parametric band’s frequency and Q, and LFO rate and depth.
| Symbol | Meaning | Unit/Datatype | Source |
|---|---|---|---|
| V | Master volume setting | percent | Input |
| g | Linear output gain | dimensionless | Derived |
| Preset | Shape Type | Freq | Q | LFO Rate | LFO Depth | Color Tilt |
|---|---|---|---|---|---|---|
| White/Pink/Brown/Blue/Violet | Low‑pass | 18 000 Hz | 0.7 | 0.0 Hz | 0 % | Flat / ±3–6 dB tilt |
| Ocean | Low‑pass | 600 Hz | 0.9 | 0.12 Hz | 38 % | Low +6 dB / High −6 dB |
| Rain | Band‑pass | 1 700 Hz | 0.8 | 0.28 Hz | 10 % | Low +3 dB / High −3 dB |
| Fan | Band‑pass | 220 Hz | 2.1 | 0.8 Hz | 12 % | Low −3 dB / High +3 dB |
| Fireplace | High‑pass | 550 Hz | 0.9 | 0.6 Hz | 10 % | Low +6 dB / High −6 dB |
| Forest night | Band‑pass | 3 500 Hz | 3.0 | 0.22 Hz | 7 % | Low +3 dB / High −3 dB |
| Field | Type | Min | Max | Step/Pattern | Error Text | Placeholder |
|---|---|---|---|---|---|---|
| Preset | select | — | — | enumerated | none | none |
| Volume | range | 0 | 100 | 1 | none | none |
| Pan | range | −1 | 1 | 0.01 | none | none |
| Sleep timer | number | 0 | — | 1 | none | none |
| Fade in | number | 0 | — | 0.1 | none | none |
| Fade out | number | 0 | — | 0.1 | none | none |
| LFO rate | number | 0 | — | 0.01 | none | none |
| LFO depth | range | 0 | 100 | 1 | none | none |
| EQ low shelf | range | −18 | 18 | 1 | none | none |
| EQ high shelf | range | −18 | 18 | 1 | none | none |
| EQ band freq | number | 20 | 20 000 | 1 | none | none |
| EQ band Q | number | 0.1 | 20 | 0.1 | none | none |
| EQ band gain | number | −18 | 18 | 0.5 | none | none |
| Spectrum smoothing | range | 0 | 0.99 | 0.01 | none | none |
| Input | Accepted Families | Output | Encoding/Precision | Rounding |
|---|---|---|---|---|
| Parameters | Enumerated preset; numeric values | Audio playback | Real‑time generated | Continuous |
| Table | — | CSV export | Comma‑separated with header | Labels rounded for display |
| Settings | — | JSON export | Pretty‑printed, 2‑space indent | No extra rounding |
| Spectrum | — | Chart | Log‑spaced bins | Smoothing visual only |
The noise source uses an unseeded pseudo‑random generator. Individual samples differ between runs, while spectral shape remains consistent for the same controls. There is no seeding switch, and exports reflect settings, not waveform data.
The sleep timer measures minutes from start or resume and schedules a fade‑out just before the deadline. The displayed end time uses your local time format. Pausing preserves the remaining time; resuming continues the countdown.
Audio is generated client‑side. A charting layer may load from a public content network during page load. Clipboard copies and downloads happen on your device; settings are not sent to a server.
Signal processing runs in real time with a fixed‑size spectrum analysis window. The visualizer samples ~log‑spaced points from the analyzer buffer for responsiveness. Performance depends on device capability; older hardware may prefer lower activity in other tabs.
Given the same controls, filters and envelopes behave deterministically. The noise stream itself remains nondeterministic by design. The spectrum view reflects the immediate output after all processing stages.
Inputs are numeric or enumerated and are not executed as code. Exports contain only settings. Avoid excessive playback levels on shared devices, and be mindful of headphone safety.
Scenario: Pink noise, volume 35 %, centered pan, fade‑in 1.5 s, fade‑out 2.0 s, sleep timer 30 min.
The output ramps to a gentle gain of 0.1225, holds steady, then fades to silence just before 30 minutes.
Use colored noise or ambience to create a steady sound bed for sleep or focus.
Example: Ocean preset, 30–45 % volume, pan centered, 2 s fades, 45 min timer.
A random signal whose spectrum is shaped by filters to emphasize or reduce certain frequency regions, producing distinct textures like white, pink, or brown.
No. Audio is generated on your device and settings are not sent to a server. Copies and downloads save locally.
It samples the post‑processing signal on a logarithmic axis. Smoothing improves readability but does not alter audio, so use it as a qualitative guide.
Seconds for fades and timers, hertz for frequencies, decibels for gains, percent for volume, and dBFS for spectrum level.
Yes after the page has loaded. A charting component may require a fresh connection if you hard‑refresh without a network.
Start with pink noise for balance. If you prefer warmth, try brown‑tilted options. For extra crispness, try blue‑tilted options. Adjust EQ to taste.
Yes. You can copy or download a summary table as CSV and a structured settings file as JSON for reuse.
It schedules a fade‑out that ends near the deadline, then pauses the engine. Pausing preserves any remaining time, so you can resume later.