How do i can this account
Question by jacindawalker | last reply
The Grateful Dead's wall of sound prevented feed back by having two mics for each vocalist with one of the mics 180° out of phase of the other. Then mixing both mics on the same channel. So the only information that wasn't canceled was the voice. This gave me an idea. I took a handset and added a mic facing backward from the existing mic. Then wired the second mic out of phase. Apparently there's more to it electrically then just wiring the other mic backwards because the handset went dead. Is this possible with just parts salvaged from old phone equipment?
Topic by AJRimmer | last reply
I have a pool pump. it seems a bit loud especially to the neighbors. I tried to buy some foam and 'for sale' signs, glued them together and wrapped them around the pump but it's still too loud, and I'm worried about overheating the pump/motor because of the wrapping of the motor/pump. Is there some way to build a sound cancellation system for this for say a hundred bucks that will run outside?
Question by kishjeff | last reply
I am playing with an idea. Higher end cars come with active noise cancellation systems to make the drive quieter and more enjoyable. However compact and subcompact class cars do not. With the noise canceling technology is available on every shelf for headphones, I am wondering if this could be hacked and repurposed to reduce road noise in a car. The system (Im presuming) would require one microphone, one noise canceling circuit board, and one speaker per wheel well. So it would require two pair of noise canceling headphones to accomplish. The idea is to improve the cabin noise quality in an off the shelf kind of way. Currently there are no aftermarket systems within the normal financial reach of most people. Only a hand full of aftermarket systems out there are available and priced @ 4K USD or more. If this works, it could be marketed at around 100 USD per unit. And provide a much nicer driving experience to the compact and subcompact cars. By placing the microphones under the carpet and on the wheel wells metal surface the system should ignore the stereo, and correct road noise transmitted from the wheels to reduce cabin noise. Stereo interference is a common problem with cabin mounted microphones on OEM systems. So, your mission if you choose to accept it, is to devise a way to reduce road noise in a compact or subcompact car using off the shelf noise cancellation circuitry available to the average person. If your successful this should be a very easy way to upgrade most cars not equipped with such a system. Having a noise canceling system in a car reduces noise fatigue, and improves the driving experience for all of us.
Topic by ydeardorff | last reply
Request: Sound canceller / radio frequency canceller. Here's the sound canceller, which is prices at around $30,000 Euros, and powers itself. (using radio frequency) http://www.digitaltrends.com/wp-content/uploads/2013/10/sono-technical-setup.jpeg Aditional request: Radio Frequency canceller. Ideally it would be something similar in concept, but would be able to cancel specific ranges also. Thanks.
Topic by WyattsAccount | last reply
Hello all:) I was wondering if I could get some help and advice about a project I've had in mind for a while. The idea is to use a modified electronic megaphone to produce sound that's antiphasic of the microphone input. I want to keep the execution as simple as possible to retain signal quality and keep it something I might be able to do myself with a little studying up. I got the idea when I noticed if you incorrectly wire a couple speakers one can produce output that's 180 degrees out of phase, cancelling most of the sound emitted. Ultimately I'd like to use the device to help quiet the sounds of the power tools I use as a favor to my neighbors and to save my hearing a bit:) This should be doable since I could keep the megaphone near the source. Thanks a bunch for any help, Pete
Topic by wolf35nine | last reply
Should i stay with Tmobile or wait for thisThe FCC has proposed a law that will give consumers signing up for cell phone services the right to cancel their service, fee-free, under certain conditions.Cancellation Fees May Be Cancelled Foreverhttp://www.webcastr.com/videos/informational/cell-phone-cancellation-fees-may-be-cancelled-forever.html
Topic by toreyray | last reply
I'm looking for advice. (now this is difficult to explain but I'll try my best) I am trying to design a way to have a dance floor in an open area that will have an area where you can hear the music but away from the area it can't be heard. I'm attempting to do this using an array of speakers around the dance floor that will cancel out the music past the dance floor. Each speaker will face away from the area and be equipped with a microphone (directed torwards the main speaker) that then goes through and amplifier and then to the speaker (wired up so that it will emmit an opposing sound wave). This would essentially create a sound barier. I have attatched a picture as a visual aid.
Topic by Sun Gear
I just joined last night, but when I finally printed out the instructions for the bench, they were much less detailed than I need/expect. I need to cancel this membership immediately and get a refund. Thank you. Virgil Klunder email@example.com
Topic by czvirg | last reply
Many brands compete with noise-cancelling technology, but all offerings seem tuned to mitigate frequencies other than voices. I appreciate that on an airplane or gun range, but in an open office plan, the only common attempt at mitigating vocal pollution is to add white noise variants. White noise systems have limited effectiveness and alleged health drawbacks. My noise cancelling headphones cut the white noise, effectively enhancing voices that I want to shut out. I can use "sound-isolation" instead of "noise-cancellation" but they are bulky and hot. I'd think it would be possible to use noise-cancellation technology to target vocal frequencies. Thoughts?
Topic by ShakyKnees
Example: when you save a certain file on your computer and if you close it.the file you save will be gone..
Question | last reply
We had some bugfixes go out last night, should be an improvement on the following issues: - Graphical Search is working again - Pro-membership tab shows Paid membership details again, so you can cancel if you so wish or check the status - Fixes to editor that got broken due to fixing things If you have issues, post them in the Bugs forums.
Topic by frenzy
A few days ago a friend gave me a directional mic he used with his camera.Of course I don't get these things as a working present but to repair them :(Anyway...Taking it apart to expose the inside was the first nightmare as for some reason my friend decided to use a splash proof mic on a totally unprotected cam.If you ever tried to take one of these aquarium tube heaters apart you know what I mean...To my surprise this formerly expensive toy failed due to a bad solder connection, easy to fix.And lucky as well because the actual microphone capsule was glued in place pretty good.A quick test on the computer with the supplied microphone amp showed it worked fine again so I wanted to find out how it actually works.They toy ones use a half sphere or mini dish to reflect the soundwaves onto the mic.My friends however was an aluminium tube of about 20cm lenght.15mm in diameter with the mic being just 5mm and sitting in what seemed to be the end of a little funnel inside the tube - right at the end.So in theory I would now just say the thing gets what comes in from the front, but well that would be far too easy...When I pulled that fluffy sock off the mic I realised two weird things:6 small holes going straight through the mic funnel and outer tube.A glued in relatively soft plastic sleeve with a wave pattern.It seemed this pattern changed on the way down but I could not really see inside properly.Closing the front hole and the mic had no problems getting all sorts of noise from all directions, quite lower in volume compared to a direct hit from the front though.Closing the small side holes with some tape and the mic is still very directional but also really noisy.It seems some acoustic magic is happening in the tube.No real clue though but I guess the sleeve acts like the sound dampening in a test room.Without it all sound entering the tube would reach the mic, while with it really only a very tiny, front facing angle is able to reach the mic.The aluminium certainly transmits some sound onto the mic and the glue appeared to be rock hard as well.So I have to assume that the sound entering through the tiny holes somehow cancels out the noise transmitted by the tube itself.With just 15mm in diameter however I can calculate what I want but am unable to get any true 180° phase shift happening.Looking up how other types of directional microphones work was a bit helpful here but not so much in understanding the holes and liner.My friend said it is well over 30 years old and that he got dirt cheap at a garage sale.No markings anywhere and the small amp only has the connectors for mic, power and output.Did not check the circuit board inside as the housing was glued together.So:Why holes in the side right at the height of the mic?Why does it "hear" all surrounding sound when the front is closed but only directional with the front open?And I mean directional even with some music playing close the mic :(By the way: Battery pack for the mic was the classic four pack at 6 Volt.
Question by Downunder35m | last reply
Please, I want to cancel my subscription. I registered once on the basis that it was necessary for accessing the contents of one particular project. I do not want to be receiving your newsletter. Sorry. Please cancel my subscription. How can I cancel my subsription?
Question by JoelG81 | last reply
Subscribtion to get PRO is absolutely clear BUT: how to cancle this account and especially the donation/payment again? Is it limited to the periode of time payed in advance (e.g. one month) or will it be charged automatically till I cancle it?
Topic by drayson | last reply
I have a small water pump in the basement that creates a lot of noise that can be heard in most of the house. Is there a way to at bulid a 4 side + top box that really works to cancel out at least some of the niose? What materials works best as noise cancelling? Thanks!
Question by lpm | last reply
If I am provided an email address I will be able to forward the emails that say I am cancelled.
Question by craftyrn1959 | last reply
I was wondering if i can cancel my pro before complete the payment of a year?? and how i can cancel it anyway??
Topic by shadon | last reply
Question by FunkFlex | last reply
I made a small stereo amplifier with 3 inputs, and L and R outputs for speakers, but how do i make another output that cancels out the speaker output?
Question by metsfan1938 | last reply
I accidentally broke by Sony MDR-NC7 headphone's cable, and when I tried to repair it I discovered that it had four cables instead of the usual three. Does it have anything to do with the fact that they're noise-canceling headphones? Two of the cables are golden, one blue and the last one red.
Question by The Landon | last reply
i saw an episode of malcom in the middle on fx and reese said something about an xbox 360... i thought the 360 came out like this year.
Question by GianniMora | last reply
I know that noise cancelling headphones exit but is it possible to scale that up and have the out-of-phase noise played through speakers? If so, and the microphones were against the wall of the offending neighbour and the speakers were to be aimed at that wall, would the noise be noticeably reduced? Thank you.
Question by FriendOfHumanity | last reply
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Topic by admin | last reply
Is it possible to position a pair of speakers in such a way that they create a bubble of silence? Say you were to play a sound through one speaker whilst playing its inverse through the other. If you were to place your head at a very exact point between them, would the sound disappear? I am interested to know if this is possible in theory but also if it would be feasible for layman to do.
Question by King.Rawrawr.the.first | last reply
I couldn't find my membership and thought that it expired so I started a new one. But today I found my old one and now I am paying for two! My user names are fernmama and fern mama. Fernmama is paying installments and fern mama paid for two years. Can I please cancel Fernmama's membership?
Topic by fernmama | last reply
1. I am a little bit blur with the Variable resistor part , must connect all three pin? 2. What about the left and right input's ground must connect to the ground in the circuit ?
Question by victordre95 | last reply