Relaxation
Try the smoother mid-focused texture when White Noise sounds too sharp or Brown Noise feels too bass-heavy. Individual listening preferences vary.
Relaxing soundsGreen Noise — Listen Online
Green Noise is a popular name for a softer, mid-focused noise texture, but unlike White, Pink or Brown Noise it has no universally agreed spectral definition. WhiteNoiseChoir's version is a continuous, original synthesized sound with less deep bass and sharp treble.
Original DSP · 10-minute master
Play Green Noise
Tap Play to start. No autoplay and no account needed.
Use the shared player for Volume, Sleep Timer and Dark Screen. Audio continues while you browse within WhiteNoiseChoir. Without JavaScript, the MP3 remains playable through native controls.
Independent 10-minute masterContinuous HLS / MP3Sleep timerDark screen
The master passed automated technical QA. Listening-quality approval on real devices is still pending.
Open the full sound machineGreen vs Pink, Brown and White Noise
Hear the actual four master files using one persistent player. Each selection changes the playing sound without switching pages or restarting an existing sleep-timer deadline.
Green NoiseMid-range focused and softly filteredCustom band-pass DSP
Pink NoiseGradual treble reduction across frequenciesPower ~ 1/f
Brown NoiseDeeper bass, less high-frequency hissPower ~ 1/f²
White NoiseBroad, bright hiss across frequenciesFlat power per Hz
The recordings are not loudness-matched. A fixed volume percentage does not guarantee equal loudness or hearing safety. Lower the volume when switching.
More information: Pink Noise · Brown Noise · White Noise
How WhiteNoiseChoir Green Noise is made
We begin with newly generated Gaussian white noise and apply two smooth digital filters: a third-order high-pass at 165 Hz and a third-order low-pass at 1,550 Hz. The result emphasizes a broad middle region, approximately 250–1,000 Hz, without claiming that these cutoffs define every version of Green Noise.
This is a custom audio design, not a medical frequency or a standardized color. The filters reduce low rumble and high hiss; they do not literally recreate a forest, river or wind recording.
Measured frequency-band profile
Band-averaged power spectral density from a 15-second sample of the final decoded MP3. These numbers describe relative digital signal energy, not sound-pressure levels at your ears.
Low bass35–105 Hz-75.4 dB
Midrange300–900 Hz-57.5 dB
High treble4,000–8,000 Hz-90.2 dB
The difference in average power spectral density is about 17.9 dB between midrange and low bass, and 32.6 dB between midrange and high treble in this sample. Further measurements at different points in the master gave comparable results.
Choosing Green Noise for listening
Sleep and winding down
A steady background may appeal to some listeners, but there is no established evidence that this specific sound improves deep sleep or treats insomnia.
Sleep soundsNoise masking
Mid-focused noise may make some nearby environmental sounds less noticeable, depending on their frequencies. It cannot remove external sounds.
Masking collectionRecording provenance & continuous playback
This 600-second recording was generated independently using original DSP and was not taken from a short clip, third-party field recording or another noise-color master. Its complete 10-minute source repeats during extended listening.
- Independent source duration
- 600 seconds · 10 minutes
- Format and channels
- MP3 · 44.1 kHz · 192 kbps · centered stereo
- Synthesis
- Seeded Gaussian noise, two cascaded IIR filters
- Reproducible source seed
- 2026110805
- Measured RMS, three independent windows
- -25.80 / -25.73 / -25.82 dBFS
- Transport
- Native 7-day static HLS playlist where supported; MP3 loop elsewhere
- Technical status
- PASS · waveform, spectral distribution, MP3 hash, HLS 10-minute transition
- Listening approval
- Awaiting real-device human review
Ten minutes describes the master recording, not your listening limit. Native HLS repeats that source through a bounded seven-day playlist; browser/device interruptions remain possible. To test the transition quickly, open the Green Noise loop test and seek to 9:55.
Green Noise questions
What frequency is Green Noise?
There is no universally standardized frequency for “Green Noise.” Our implementation uses a third-order 165 Hz high-pass and a third-order 1,550 Hz low-pass, so the result emphasizes the middle of the audible spectrum. Other producers may use different filters.
Is Green Noise the same as nature sounds?
No. Our track is synthetic filtered noise. It may sound softer or somewhat nature-like to some listeners, but it is not a forest, ocean, rain or wind field recording.
Can Green Noise help people sleep?
Some people prefer a stable mid-frequency sound while winding down; there is no clinically established benefit specific to this Green Noise design. Keep playback at a comfortable volume.
What makes this recording distinct from Pink Noise?
Pink Noise follows a power distribution near 1/f across a broad range; our Green Noise uses two filters to reduce both low bass and high treble. Try the live comparison above to hear the difference.
Will the recording stop at the 10-minute mark?
No. The 10-minute master repeats in the shared player, including native HLS where supported. An operating-system interruption or timer can still stop playback.
Browse Noise Colors · Full sound library · Source attribution and licenses