OF OREGON ASSIGNMENT OF ASSIGNORS INTEREST. OF OREGON reassignment BALLANTINE LABORATORIES, INC., A CORP. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Ballantine Laboratories Inc filed Critical Ballantine Laboratories Inc Priority to US05/636,632 priority Critical patent/US4000463A/en Application granted granted Critical Publication of US4000463A publication Critical patent/US4000463A/en Assigned to BALLANTINE LABORATORIES, INC., A CORP. Original Assignee Ballantine Laboratories Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US05/636,632 Inventor Fred L. Google Patents Direct-reading decibel meterĭownload PDF Info Publication number US4000463A US4000463A US05/636,632 US63663275A US4000463A US 4000463 A US4000463 A US 4000463A US 63663275 A US63663275 A US 63663275A US 4000463 A US4000463 A US 4000463A Authority US United States Prior art keywords signal amplitude voltage output converter Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4000463A - Direct-reading decibel meter To book an appointment in Calgary or at another one of our clinics, contact us today.US4000463A - Direct-reading decibel meter Whether you need to have your hearing tested or have a hearing impairment and require hearing aids, our audiologists will be glad to help. Soundwave Hearing Clinic is proud to provide hearing solutions to residents of Calgary, Grande Prairie and surrounding areas. Keep in mind that the volume on most handheld devices goes up to 80dB and above. You should also avoid listening to music at high volumes, especially while wearing headphones. If you work in a noisy environment or often attend live concerts, it’s important to wear some form of hearing protection. For instance, you’re likely to experience permanent hearing loss after being exposed to a sound of 85dB for eight hours, but you risk permanent hearing damage after only 15 minutes of exposure to 100 dB. Hearing loss occurs as a result of how loud a sound is and how long you’re exposed to it. How high-decibel sounds cause hearing loss Here are the approximate decibel levels for some everyday sounds:
Over the course of a day, you hear noises that register at all different points on the decibel scale, from wind rustling in the trees to cars honking in the streets.
While decibels are most commonly used to measure sound, they also have applications as a measuring unit in the electronics and telecommunications industries. This is because the decibel scale was developed so that the first telephone companies could represent the amount of signal loss in phone lines. Each decibel involves an increase of approximately 26%, which is roughly the smallest change in sound that the ear can detect.Ī decibel is one-tenth of a bel, a rarely used unit named for Alexander Graham Bell, the inventor of the telephone. As a result, the decibel scale can range from 0 dB to 150 dB and still accommodate all the sound levels that humans hear. This means that a sound that’s 100 dB is not 10 times more intense than 10 dB, but rather 1,000,000,000 times more intense. On a logarithmic scale, values increase by powers of ten. If you tried to represent the full scope of human hearing using a linear scale, you’d need to use a range of sound levels from 0 to 100,000,000,000, which is far too vast to be useful. Decibels as a measure of sound intensityīecause human ears can hear noises with both very small and very large pressure waves, sound intensity needs to be measured using a logarithmic rather than linear scale. Keep reading to learn more about how decibels are calculated and what kinds of sounds can lead to hearing loss. In audiology, we use decibels when testing people’s hearing and identifying which sounds can damage human eardrums. A decibel is a unit of measure that compares two power levels, most often used when talking about sound intensity.