What this noise synthesizer controls
Four spectral colors: white, pink, brown and blue noise are generated locally in the browser.
Parametric warmth: the low pass cutoff and resonance controls shape the sound before it reaches your speakers.
Real time spectrum: the canvas display shows the changing frequency energy so the selected slope is visible, not just audible.
Sleep timer: 15, 30, 45 and 60 minute sessions end with a gradual fade rather than an abrupt stop.
# How pink, brown, white and blue noise differ
Noise color describes how sound energy is distributed across frequency. White noise gives every narrow frequency band roughly equal power, so it often sounds bright and hissy. Pink noise reduces energy as frequency rises, about 3 dB per octave, so each octave feels more equal to the ear. Brown noise reduces energy even faster, about 6 dB per octave, producing a deeper, smoother rumble. Blue noise moves in the opposite direction and emphasizes higher frequencies.| Noise color | Approximate slope | Common listening impression | Typical use |
|---|---|---|---|
| White | 0 dB/oct | Bright static with strong high frequency detail | Short masking sessions, office distractions, sound checks |
| Pink | -3 dB/oct | Balanced rain like texture with less sharpness | Sleep support, focus, broad tinnitus masking |
| Brown | -6 dB/oct | Deep low frequency wash with minimal hiss | Relaxation, low arousal bedtime sound, bass weighted masking |
| Blue | +3 dB/oct | Crisp and airy with more treble energy | Brief alertness cues or comparison listening |
- Octave
- A doubling of frequency, such as 250 Hz to 500 Hz or 1 kHz to 2 kHz.
- dB per octave
- A way to describe how quickly sound level changes as frequency doubles.
- Low pass filter
- A filter that keeps lower frequencies and progressively reduces frequencies above its cutoff point.
- Q factor
- A resonance control that makes the filter curve broader at low values and more focused at high values.
Fast starting point
For sleep, start with pink noise, volume near 25 to 35 percent, cutoff between 2500 and 4500 Hz and Q below 1.5. For a darker sound, switch to brown noise before raising the volume.# How to tune noise for sleep without making it intrusive
The goal of sleep noise is usually not to dominate the room. A good setting reduces contrast: it makes a door click, traffic pulse or distant voice less sudden, while still allowing the nervous system to settle. Pink noise is often a practical first choice because it covers a wide range without the sharp top end of white noise. Brown noise may be preferable when high frequency hiss feels irritating or when the listener associates deeper sounds with calm environments such as distant surf or ventilation.- Keep the level modest: if you need to raise your voice to speak over the sound, the setting is probably too loud for bedtime.
- Reduce brightness first: lower the cutoff before increasing volume. This often solves harshness while preserving masking.
- Avoid dramatic resonance: high Q values can create a noticeable tone at the cutoff frequency, which may become distracting in quiet rooms.
- Use the fade timer: a planned fade helps the brain treat the sound as a sleep cue rather than an all night dependency.
When not to rely on a noise generator
Do not use noise synthesis to ignore sudden hearing loss, ear pain, pulsatile tinnitus, dizziness, one sided symptoms or rapidly worsening ringing. Those patterns deserve medical assessment because sound masking does not address the underlying cause.
-3 dB/oct Pink noise roll off
-6 dB/oct Brown noise roll off
100 Hz Lowest cutoff setting
60 min Longest sleep timer
# Using filtered noise for tinnitus masking and habituation
For tinnitus, broadband sound can reduce the contrast between the internal ringing and the environment. The aim is often a mixing point: the external sound is audible and calming, but not so loud that it completely overwhelms perception. Some tinnitus retraining approaches use low level, neutral sound for long periods to support habituation. This tool is not a clinical protocol, but the same listening principle applies: use enough sound to reduce threat and attention, not enough to create fatigue.Pink noise for tinnitus
A balanced broadband texture that can mask high and mid frequency tinnitus while staying less sharp than white noise.
- Good first setting for many listeners
- Works well with moderate cutoff values
- Less bass heavy than brown noise
Brown noise for tinnitus
A darker profile that may feel calmer for listeners who are sensitive to hiss or treble rich sound.
- Stronger low frequency emphasis
- Often comfortable at bedtime
- May under mask very high pitched tinnitus
Masking versus gentle background sound
Advantages
- Masking can give quick relief when ringing is intrusive.
- Gentle background sound supports habituation habits and relaxation.
- Parametric filtering lets the listener reduce harsh bands.
Disadvantages
- Full masking at high volume may be tiring and can make quiet feel more noticeable afterward.
- It may not hide every tinnitus fluctuation during a difficult spike.
- Over shaping the sound can create a narrow tone that draws attention.
Volume rule
Set the volume at the lowest level that changes your perception of the room or tinnitus. Comfort is the target; intensity is not a sign of better therapy.
# What the cutoff and resonance controls actually do
The cutoff slider controls a low pass filter from 100 Hz to 10000 Hz. At high settings, most of the generated noise remains audible. As the cutoff moves downward, the filter removes more upper frequency content, so white and pink noise lose hiss and brown noise becomes even softer. This is useful because two sounds with the same volume can feel very different depending on how much energy is concentrated above 4 kHz.The resonance control, labeled Q, changes the shape around the cutoff. Low Q values produce a gentle curve. Higher values create a peak near the cutoff before the filter rolls off. A small amount can add presence or body; too much can make the noise whistle or pulse. For sleep and tinnitus, subtle Q settings are usually more comfortable than dramatic ones.| Goal | Noise type | Cutoff range | Q range |
|---|---|---|---|
| Soft sleep bed | Pink or brown | 1800 to 4500 Hz | 0.3 to 1.2 |
| Office focus | Pink or white | 3500 to 8000 Hz | 0.5 to 2.0 |
| Treble sensitive tinnitus | Brown or filtered pink | 1000 to 3500 Hz | 0.3 to 1.0 |
| Compare spectral colors | Any | 7000 to 10000 Hz | 0.7 to 1.5 |
Why the visualizer matters
The spectrum display helps confirm that the selected sound behaves as expected. Pink noise slopes downward, brown noise falls more steeply, white noise stays flatter and blue noise rises toward higher frequencies. The display is not a calibrated analyzer, but it is useful for understanding the relationship between what you hear and the frequency curve being generated.
# Practical settings for focus, relaxation and sound masking
- Focus in a quiet office: pink noise, 30 to 45 percent volume, cutoff near 5000 Hz, Q below 1.5.
- Reading with ADHD related distractibility: pink noise or low white noise, enough level to blur sudden sounds, timer off for short work blocks.
- Pre sleep wind down: brown noise, 20 to 35 percent volume, cutoff near 2500 Hz, 30 minute fade out.
- High pitched tinnitus evening support: pink noise with cutoff between 3500 and 6500 Hz, then reduce volume until the ringing remains faintly perceptible.
- Noisy apartment masking: pink noise for voices, brown noise for low mechanical hum, adjusted so the room feels steady rather than loud.
Why one preset cannot fit everyone
Room acoustics, speaker size, hearing profile, tinnitus pitch, stress level and the time of day all change how a noise color feels. A phone speaker may barely reproduce brown noise below 150 Hz, while a larger speaker can make the same preset sound much stronger. Treat the controls as a calibration panel for your actual listening situation.
Recommended adjustment order
Choose the gentlest noise color that works for the task.
Set volume before using resonance.
Lower cutoff to remove harshness.
Use Q sparingly and return to low values if the sound becomes tonal.
Add a timer when the session is meant to end after sleep onset or a work block.
# Safety, comfort and listening hygiene
Continuous sound can be helpful, but it should be treated like any other auditory exposure. The safest habit is to keep intensity low, build breaks into daytime use and avoid sleeping with sealed earbuds at high levels. If the sound causes pressure, headache, ear fullness, anxiety or a sense of worsening tinnitus, stop the session and return later with a lower setting or a different noise color.For children, people with hyperacusis, recent ear surgery, active ear infection, migraine associated sound sensitivity or diagnosed hearing disorders, personalized clinical advice is preferable to self directed long sessions. The tool is designed for wellness, masking and experimentation with spectral balance. It does not measure hearing thresholds, diagnose tinnitus subtype or replace an audiological evaluation.A simple overnight rule
If you use speakers, place them away from the pillow and set the level so the sound is clearly below normal conversation. If you use headphones, favor short sessions with the fade timer instead of all night playback.When to seek assessment
Persistent tinnitus after noise exposure, tinnitus with hearing loss, pulsing sounds in time with the heartbeat, vertigo or one sided symptoms should be discussed with a clinician. These cases need more than a masking sound because the pattern can point to specific medical or audiological causes.