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| Sound cancelling speakers in bedroom for traffic |
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| ConKbot:
--- Quote from: CatalinaWOW on August 12, 2018, 10:07:35 pm ---While I understand and agree with the objections to large area noise reduction, there must be some possibilities in this area. Several modern cars use active noise cancellation to reduce cabin noise and by all reports it is at least somewhat successful. I don't know how they do it, but do know that in one example I sat in there were multiple sound pickups and emitters involved. The systems are highly engineered for the vehicle so not the kind of thing you would buy and install in a room. --- End quote --- Cars have the occupants heads in a relatively consistent spot, so for lower frequencies, it's is doable. Add a bevy of microphones, do simulation and measurements of sound in the interior, bake that down into something more simple to let the sound DSP run, and you can make 2 quiet zones near the headrests. |
| Howardlong:
--- Quote from: ConKbot on May 06, 2020, 06:13:05 am --- --- Quote from: CatalinaWOW on August 12, 2018, 10:07:35 pm ---While I understand and agree with the objections to large area noise reduction, there must be some possibilities in this area. Several modern cars use active noise cancellation to reduce cabin noise and by all reports it is at least somewhat successful. I don't know how they do it, but do know that in one example I sat in there were multiple sound pickups and emitters involved. The systems are highly engineered for the vehicle so not the kind of thing you would buy and install in a room. --- End quote --- Cars have the occupants heads in a relatively consistent spot, so for lower frequencies, it's is doable. Add a bevy of microphones, do simulation and measurements of sound in the interior, bake that down into something more simple to let the sound DSP run, and you can make 2 quiet zones near the headrests. --- End quote --- Won't work. Ears are too far apart, 180 degrees apart at about 800Hz. one ear will have constructive interference, the other destructive interference. Noise cancelling only works practically in the very near field. |
| cdev:
I can testify to the effectiveness of triple paned (in my case argon filled) windows for noise reduction (and privacy during the day) The reduce sounds around 30 db. But they arent THAT expensive. At least mine werent. And they were custom built. Shop around. You can use a pink noise generator to mask sounds. I used to use a fan or tv noise back when they had analog tvs. Also soft foam earplugs and sound absorbent egg style board on the walls.. (it eats up sound) Thank God that I don't have to live like that anymore. I used to have to work at night and sleep in the day. It was fun but it also led to chronic sleep deprivation. --- Quote from: In Vacuo Veritas on August 09, 2018, 04:49:21 pm ---You need STC rated window panes, 48 or above, professionally installed. Or you can add a second inner window pane over the existing one. Either way, you're looking at thousands of dollars. At least also get EER windows to cut on the heat gain in summer, and heat loss in winter. --- End quote --- |
| Berni:
Forget about it. canceling wont work without headphones because the speed of sound is simply too slow. If you have old windows just simply replacing the rubber seal around the edge will make a big difference, easily >10dB because the rubber gets old and hard so it doesn't conform properly and seal. This also helps with your heating bill in the winter. Just simple double pane glass windows can stop a lot of sound if the seals are in good state. But if you upgrade the entire window to a good modern triple pane window you can get the room so quiet its uncomfortably silent. They are not that expensive, few hundred bucks for a regular standard window with installation. We did both of those upgrades on our house, the new rubber seals made a big difference and new windows even more. To the point that once we had a truck deliver some gravel behind the house and some time later someone steps outside to find the big pile of gravel has mysteriously appeared while all 3 family members ware at home. Nobody did hear the truck back up into the yard and dump it, the truck driver didn't come up to the front door because he already knew where we wanted the gravel dumped. They work THAT well. And yes having a room with a lot of echo will make the noise easily seam 4 times louder than it is. In those cases simply hanging a curtain or putting some foam on a wall can make a very noticeable difference. |
| LaserSteve:
If your dealing with reflected sound in the house: Owens Corning 703 is your friend. Acoustic Cloth to wrap the panels in, comes from Guilford of Maine. Also Roxul Safe and Sound or Quiet-Batt if you can put it in the walls. Break the corners of the room with acoustic treatment so they do not act as corner reflectors, and damp the ends and sides of hallways so they do not act as waveguides. In the right place, a few panels of adsorbing material can do wonders, but it takes some work. Leave an air gap between the panels and the walls if hung, of about 3 mm. Grids of panels with half wave spacing at the frequency of interest can reduce costs over covering the whole wall for reflection mode damping. Wood lattices aka "acoustic wood panels" can be decorative and scatter or adsorb the sound. But they have to be tuned. There is a great deal of info out there on making home music studios soundproof and echo proof. Start there. I've found that often you do not have to treat whole walls if your willing to do a bit of wave math. Right now I'm listening to a woman in the kitchen, scraping plates from twenty feet away, The sound is guided down a hallway to my bedroom. So maybe it is time I put some panels in the hall. My bedroom is 60 feet from a busy street, with a classic wooden house, given time, you simply get used to it, and your brain looks for differences in the pattern to wake you, not waking on every loud muffler that goes down the street. During the day, however, it gets annoying. The living room has a new, massive, multi pane, PVC framed window. It is wonderfully quiet in there compared to the aluminum framed windows with the classical glass. The reduction in the heating bill and noise was noticeable when we replaced that window, the wooden garage doors, and a large sliding glass door with the newer technology. Here in cold Northern Ohio, the payback was noticeably quick. However in this case White Noise is a good idea. Steve |
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