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原文来自:http://www.babyplus.com/Safe.aspx
分贝级别和危险噪音
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典型的分贝 |
声音说明举例 |
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0 |
Lowest sound audible to the human ear人类的耳朵可听见的最小声音 |
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10 |
Normal breathing普通呼吸声音 |
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20 |
Whispering at 5 feet耳语 |
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30 |
Quiet library, 温和的耳语声 |
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40 |
Living room, quiet office, bedroom away from traffic远离交通的卧室，办公室的声音 |
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50 |
Light traffic at a distance, refrigerator, gentle breeze微风 |
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45-60 |
BabyPlus when it reaches the prenatal child through the maternal abdomen（babyplus通过孕妇的腹部最终到达婴儿那里的声音） |
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60 |
Air conditioner at 20 feet, conversation, sewing machine（谈话，锁线装订机的声音） |
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70 |
Busy traffic, office tabulator, noisy restaurant. At this decibel level, noise may begin to affect your hearing if you're exposed to it constantly |
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The Hazardous Zone（有风险的声音区域） |
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80 |
Subway, heavy city traffic, alarm clock at two feet, motorboats 85 to 115 dBA, factory noise. These noises are dangerous if you are exposed to them for more than eight hours.（铁路，繁杂的城市交通） |
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90 |
Truck traffic, motorcycles 95 to 120 dBA, snowmobiles 99 dBA, noisy home appliances, shop tools, lawn mower. As loudness increases, the “safe” time exposure decreases; damage can occur in less than eight hours. |
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95 |
The womb's continuous maternal bloodpulse sound level(孕妇子宫持续的血液脉冲声音级别) |
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100 |
Chain saw, stereo headphones 105 to 120 dBA, pneumatic drill. Even two hours of exposure can be dangerous at 100 dBA, and with each 5 dBA increase, the “safe time” is cut in half. |
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110 |
Video arcades can be this high. |
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120 |
Rock band concert in front of speakers, health clubs, aerobic studios, sandblasting, movie theaters measured up to 118 dBA, sporting events up to 127 dBA, thunderclap. The danger is immediate: at 120 dBA exposure can injure your ears. |
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130 |
Children's toys that emit sounds many at 135 to 150 dBA, percussion section at symphony, stock car races, jackhammer, power drill |
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140 |
Gunshot 150 to 167 dBA, air plane taking off, “Boom Cars” 140 dBA and beyond, bicycle horn. Any length of exposure time is dangerous; noise at 140 dB may cause actual pain in the ear. |
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150 |
Jet engine taking off, firecrackers range from 125 to 155 dBA at an average distance of 10 feet, cap gun, balloon pop |
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160 |
fireworks (at 3 feet), rifle shot, handgun |
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170 |
Shotgun |
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180 |
Rocket launching pad. Without ear protection, noise at this level causes irreversible damage: hearing loss is inevitable. |
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Information provided by the American Academy of Otolaryngology-Head and Neck Surgery Inc., Washington, D.C.1983 and League for the Hard of Hearing 1996-2003. |
FIELD EFFECTS
The electromagnetic field produced by the four babyplus AA batteries has no adverse impact upon the developing baby.
PHYSIOLOGICAL EFFECTS
Tachycardia resulting from the babyplus sonic rhythmicity has never been observed.
MOTOR EFFECTS
Prenatal arm and leg movements in response and sometimes syncopated to the babyplus rhythms may last up to 20 minutes during the prescribed one-hour stimulation period.
SLEEP EFFECT
Fetal sleep states remain undisturbed by babyplus stimulation, just as a mother’s blood maintaining an incessant 95 dB in utero presence does not detract from prenatal sleep cycles.
LONG-TERM EFFECTS
Over 100,000 children prenataly enriched by babyplus—the oldest now age 20—have been born worldwide to parents of diverse socioeconomic backgrounds; not a single health or behavioral factor has been reported as negative. Only superlative outcomes are observed by families and professionals, whether physicians, psychologists, or educators.
EVALUATORS AND PEER REVIEW
The primary safety studies were conducted by Brent Logan, Ph.D., and Rene Van de Carr, M.D., through the Prenatal Institute, Seattle, WA; these initial evaluations occurred during 1985-87, with several replications in subsequent years as new babyplus technology was developed. Procedure descriptions and outcomes were published in "Infant Outcomes of a Prenatal Stimulation Pilot Study," Pre and Perinatal Psychology Journal, 1991. Independent examination of these matters was made by Mikhail Lazarev, M.D., Children’s Rehabilitation Center, Moscow, and a physician team at Madras Medical University, Madras, India, under D. Raja, M.D.
SONIC EFFECTS
By digitally sampling hydrophone recordings of normal uterine sounds, specifically that of maternal blood pulsing past the placenta, an electronic baseline was established from which variants in tempo and tone could be generated; these incremental changes were then compared on a real time analyzer for fidelity to standard sonic parameters of the womb. Controls assured that all ex utero sound--whether from audiocassette player maximum volume setting or microchip source--after attenuating 30-35 dB from abdominal tissue and fluid, would reach any fetus below the 95 dB cresting level of its in utero maternal bloodpulse; this audio ceiling is maintained by both original sound reproduction and transducer constraints, falling below that of television, radio, and CD player dB levels which all contemporary unborn children experience. No other prenatal learning methods are similarly controlled, therefore even random classical music does not meet this standard.
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