'Ocean' is the sound of waves crashing on a beach, 'Rain' is the pattering of rain drops and 'Stream' is a gentle trickle of water. 'Balanced Noise' is the classic static noise, while 'Bright Noise' has a slightly higher pitch and 'Dark Noise' has a slightly lower one. Then click on 'Background Sounds', and the switch at the top of the list toggles whether the noise is on or off.Ĭlicking on 'Sound' takes you to a list of six noises to choose from: 'Balanced Noise', 'Bright Noise', 'Dark Noise', 'Ocean', 'Rain' and 'Stream'. These can be accessed by going into the Settings app and clicking 'Accessibility', and then 'Audio/Visual'. Six soothing background sounds are available to be downloaded onto your iPhone, and can be played through the night. It is alleged to aid sleep as it helps even out the difference between ambient noise and any disruptions that may stimulate your brain - such as traffic, or a dog barking. This span is why it's called 'white' noise, in a nod to light, which turns white when all the light frequencies are in a single beam. The frequency range a human can hear is 20 Hertz to 20,000 Hertz - a very low organ pipe might produce a 20-Hertz sound, while a dog whistle can be 20,000 Hertz.
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