Rockbox Development > Feature Ideas
"White Noise" Sound feature!
Reece:
If your like me and love having noise canceling head-sets/white-noise, but don't want to pay the extra $$$ to get one, wouldn't it be great to have a noise canceling/white noise feature build in to an mp3 device?!
Basically, under Settings/Sound settings/ there would be an option for "White Noise." If you turn it on, it would run a white sound loop over the external speakers/headphones. It would run during any application, music, or game. And can only be deactivated by going into the settings and turning it off, or (of course) turning off the player. That means it will run during any feature of the device, even Doom, which usually turns off music when started. I am sure there is a way to get it to run in the background while audio is playing.
As an extra, you could even choose the type of noise; such as White, Brown, Pink, and so on.
(Yes there are color coded sounds. I like White, Brown, And Blue noise the best :) )
There could even be a condition setting. So if there is a feature of the device you don't want it to run in, for instance, the radio, you can just set it to turn off whenever you activate the radio, and turn back on when the radio is turned off.
( Excuse the obviously un-revised writing, I am in a hurry (Again) )
Reece:
NOTE: There could be the feature to add your own loop file to play in the background.
wodz:
I don't get your idea, You want to mix actual music with white/pink/whatever noise? What for?
Reece:
Noise-cancelling headphones are headphones that reduce unwanted ambient sounds. When you buy a pare of "Noise Canceling" headphones, and turn them on, they make a soft "shhhh" sound. Normally the sound is made by the headphones using an "antinoise" signal," which is basically soft static. but many devices just use seamless white noise loops instead ( Listen here: http://www.youtube.com/watch?v=1KaOrSuWZeM: ) It decreases the outside noise, while making your music/audio-books sound better. The sound the headphones make is white noise. And all you need to make your headphones noise canceling is to play white noise on them. So if you have the mp3-device play white noise in the background, it will make your listening experience allot better. And white noise is very faint, and does not interfere with the audio quality of your music, it enhances it. And you can always choose to turn it off.
Here is a quick clipping from wiki:
(It may explain noise cancelling better than I can.)
Noise cancellation makes it possible to enjoy music without raising the volume excessively. It can also help a passenger sleep in a noisy vehicle such as an airliner. Research examining the benefits of noise cancelling headphones in the aviation environment has found that compared to passive noise attenuating headphones or no headphones, noise cancelling headphones significantly increases the signal to noise ratio, making hearing important information such as safety announcements easier. The benefits of noise cancelling headphones also extend to situations involving concurrent task (dual task) performance such as completing a maths based task (e.g., Sudoku) as well as listening task.
Noise-cancelling headphones typically use ANC to cancel the lower-frequency portions of the noise; they depend on more traditional methods such as soundproofing to prevent higher-frequency noise from reaching the ear. This approach is preferred because it reduces the demand for complicated electronic circuitry that would be required for noise cancellation at higher frequencies, where active cancellation is less effective. To truly cancel high frequency components (coming at the ear from all directions), the sensor and emitter for the cancelling waveform would have to be adjacent to the user's eardrum, which is not technically feasible.
(Hope this helps)
EDIT: Brown, Pink, Blue ect... Those are just extra types of soft randomized sound just like white noise. But they do not work near as well with audio as white noise does.
EDIT(2): I found this wiki all about white noise: http://en.wikipedia.org/wiki/Colors_of_noise
wodz:
Maybe I am missing something but from my limited signal processing knowledge it should be 'noise' in reverse phase to the ambient noise (which is not exactly white noise). I heard of systems doing online FFT and artificially generating anti-phase noise to do noise cancellation but this is much different to simply mixing with noise.
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