 OfflineNewbie
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« on: October 07, 2011, 10:40:32 am » |
i want to make active noise cancelling headphones my generating destructive sound. is this even possible with an arduino? if it is, how would i go about doing this?
thanks!
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Montreal
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Per aspera ad astra.
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« Reply #1 on: October 07, 2011, 12:46:13 pm » |
IMHO, arduino isn't up to. Ether completely analog or digital version, first one doesn't require MCU, and you only need bunch OPA, second one need more processing power than arduino could afford.
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« Reply #2 on: October 07, 2011, 08:18:27 pm » |
what is an opa? sorry, im a noob
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Left Coast, CA (USA)
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Measurement changes behavior
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« Reply #3 on: October 07, 2011, 08:31:17 pm » |
As the raw input and output for this kind of application is analog, the AVR micro-controller is just the wrong tech to use. Dsp equipped processor chips would be a better match for this kind of application. http://en.wikipedia.org/wiki/Digital_signal_processorLefty |
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Global Moderator
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« Reply #4 on: October 07, 2011, 09:55:57 pm » |
How about checking these out? http://www.headsetsinc.com/I put these in the headphones in my plane. |
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Digital Power Engineer
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« Reply #5 on: October 07, 2011, 11:08:45 pm » |
You can get a very impressive amount of noise reduction with just passive means. Much easier than dealing with DSP. I just use a pair of JVC HA-FX34s with the foam pieces replaced with ear plugs with a hole drilled in them.
An easy way is to just crank up the volume and use earplugs to get it back down to a comfortable level. It would almost certainly use less power than a DSP unless there's already one in your application. A cheap pair of earplugs would give 29dB of SNR improvement, probably more than you need.
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"Optiboot: the Tiffany Yep of Arduino bootloaders."
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« Reply #6 on: October 07, 2011, 11:33:24 pm » |
Passive doesn't dampen the effect of deeper bass rumble, like from an engine. Active is much better for that.
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'round the world...
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« Reply #7 on: October 08, 2011, 12:40:24 am » |
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Eu não sou o teu criado. Se respondo no fórum é para ajudar todos mediante a minha disponibilidade e disposição. Responder por mensagem pessoal iria contra o propósito do fórum e por isso evito-o.
Se realmente pretendes que eu te ajude por mensagem pessoal, então podemos chegar a um acordo e contrato onde me pagas pela ajuda que eu fornecer e poderás então definir os termos de confidencialidade do meu serviço. De forma contrária toda e qualquer ajuda que eu der tem de ser visível a todos os participantes do fórum (será boa ideia, veres o significado da palavra fórum).
Nota também que eu não me responsabilizo por parvoíces escritas neste espaço pelo que se vais seguir algo dito por mim, entende que o farás por tua conta e risco.
Dito isto, mensagens pessoais só se forem pessoais, ou seja, se já interagimos de alguma forma no passado ou se me pretendes convidar para uma churrascada com cerveja (paga por ti, obviamente).
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« Reply #8 on: October 08, 2011, 07:38:59 am » |
Yes. Others have a boat. Or drive very expensive cars. I bought a plane instead.
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« Reply #9 on: October 08, 2011, 10:36:44 am » |
Yes. Others have a boat. Or drive very expensive cars. I bought a plane instead.
I have several planes. This is the nicest one. But a Mooney would be fun. Or a personal gyrocopter. |
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... it is poor civic hygiene to install technologies that could someday
facilitate a police state. -- Bruce Schneier
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« Reply #10 on: October 10, 2011, 08:53:01 pm » |
As the raw input and output for this kind of application is analog, the AVR micro-controller is just the wrong tech to use. Dsp equipped processor chips would be a better match for this kind of application.
where would i cheaply get one of these? |
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Left Coast, CA (USA)
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« Reply #11 on: October 10, 2011, 09:58:43 pm » |
As the raw input and output for this kind of application is analog, the AVR micro-controller is just the wrong tech to use. Dsp equipped processor chips would be a better match for this kind of application.
where would i cheaply get one of these? This brochure list 'noise cancellation' application information avalible, so search around their site. |
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« Reply #12 on: October 11, 2011, 01:32:18 am » |
The link I posted earlier is for $170 or so for two boards that do noise cancelling, one for each ear, and work quite well.
Find apair of Peltor hearing protectors and mount them in it.
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