|Acoustics and Hearing Loss [ was Common house design||<– Date –> <– Thread –>|
|From: Sharon Villines (sharonsharonvillines.com)|
|Date: Sat, 23 May 2015 11:45:33 -0700 (PDT)|
> On May 22, 2015, at 11:06 AM, Muriel Kranowski <murielk [at] vt.edu> wrote: > So, a primary outcome should be "people can easily > chat with the person next to them or across the (not too wide!!) table > during meals.” It is also becoming more well-recognized that any noise that you have to raise your voice to speak over is loud enough to damage hearing with as little as 30 minutes of exposure. As in one CH dinner. Or amplified music. Some ears are more susceptible to damage than others and some heal faster. Aging is partly physical decline and partly years of exposure to noise. Normal conversation is variously measured at 55-60 decibels. Decibels are measurements of pressure and used in many fields. Sound places pressure on the ear drum and damages it depending on the amount of pressure for what length of time. It’s a bit like a tight wrist band. Putting it on is one thing but wearing it for an hour can cut off circulation. Several hours can cause permanent damage. The damage is incremental. Bill Clinton didn’t need a hearing aid at 50 for nothing. I included a list of the damage levels below along with a link to the DC code on noise. I think it is a good one but it is never enforced. The officers like most people don’t believe that loud music is even loud. I can hear the high school football announcer on the loud speaker more than 4 blocks away. In the stands, all the kids hearing is in danger. Except maybe those in football helmets. Many people consider the noise in our dining room to be exciting and a reflection of the fun people are having. Others stay home. The DC code nicely summarized: http://dcra.dc.gov/publication/noise-regulations-handbook-0 OSHA Standards (and OSHA is measuring for enforcement in workplaces, not usually the low levels recommended by hearing professionals.) The number of hours of being exposed to a particular decibel level before it normally causes hearing damage. Some people are more susceptible than others. 8 hrs 90 (A subway train) 6 hrs 92 4 hrs 95 3 hrs 97 2 hrs 100 1.5 hrs 102 1 hrs 105 0.5 hrs 110 0.25 hrs 115 (Rock drilling) Ear plugs reduce sound levels 20-30 decibels. The following are measurements collected from various sources. The numbers vary but you can get the picture. A food court, I’ve measured at 70-80. At 80-90 is when you have to raise your voice to be heard. CH meals easily reach this level and above. We have a few people with very loud voices, plus the commercial washer and other people talking over it. Kids running around yelling. Remember the measurement scale above. Decibels are not measured like degrees. 80 db is much louder than the equivalent of 20 degrees than 60 db and can cause damage in as little as 30 minutes by some measures. 188 Apollo Liftoff 163-170 Mauser Pistol 150 Snare Drums at 6 inches away 150 Trumpet Peaks at 5 inches away 150 Jet Take-Off 143-170 Rifles, a single exposure at this level can cause hearing loss 130 Jack Hammer 130 Threshold of Pain, 125 Chain Saw 120 Thunder Clap 120 Ambulance Siren 115 Rock Drilling 115 Pig squeals 113 56 seconds at this level can cause hearing loss. 110 Dance Club (91-96+) WHB 86 percent are above this. 105 WHO: 5 minutes a day can cause serious hearing loss. 103-107 Referee Whistle 103 Leaf Blower 95-120 Mower 93-103 Tractor 90 Subway 88 Food Blender 80-115 Motorcycle 80-115 Home Stereo 78 Heavy Traffic 70-80 Street Traffic 65 Conversation 55-65 Airport Terminal 50-60 Large Store 50-60 Office 50 Automobile at 50 miles an hour 15-20 Whisper 0-5 Threshold of hearing (0 = Healthy Kids) Sharon ---- Sharon Villines Takoma Village Cohousing, Washington DC http://www.takomavillage.org
- Re: Common house design, (continued)
- Acoustics and Hearing Loss [ was Common house design Sharon Villines, May 23 2015
- Acoustics [was Common house design Sharon Villines, May 24 2015
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