Science with a Smartphone: Decibel Meter – Scientific American

Note the loudness of a sound also depends on your distance from the source of the sound it will get quieter as you get farther away —so to do a direct comparison of different sounds, you have to keep this distance constant. What does all this have to do with a smartphone? If you wanted to measure sound levels previously, you would have had to buy a stand-alone decibel meter—a device with a microphone and a screen that would display the sound level in dB. Modern smartphones, however, which already contain built-in microphones can run apps that will display the sound reading in dB directly on the phone’s screen. So if you want to explore the sounds of the world around you, all you need is a phone!
free db meter app

Free Sound Level Meter App from CDC’s National Institute for Occupational Safety and Health

Note the loudness of a sound also depends on your distance from the source of the sound it will get quieter as you get farther away —so to do a direct comparison of different sounds, you have to keep this distance constant. What does all this have to do with a smartphone? If you wanted to measure sound levels previously, you would have had to buy a stand-alone decibel meter—a device with a microphone and a screen that would display the sound level in dB.

Modern smartphones, however, which already contain built-in microphones can run apps that will display the sound reading in dB directly on the phone’s screen. So if you want to explore the sounds of the world around you, all you need is a phone!

There are plenty of free options available, but some apps may have ads or in-app purchases enabled. Get to know your decibel meter app. Some apps will just display a number on the screen whereas others will display a meter or a graph. Some will also let you record data. Make sure the app is working: Talk at a normal volume, and you should see the numbers fluctuate. Procedure Determine the level of background noise.

Put the phone down, sit perfectly still and hold your breath. What is the decibel level? Does it fluctuate with background noises, such as a car driving by or a bird chirping?

Now explore your own voice. Try whispering, talking and even yelling at the phone. You can also try other sounds such as whistling or humming. Does the whisper even register or is it drowned out by the background noise? How loud is your yell? If there are other people around, try measuring their voices as well. Who can yell the loudest? Now test different sounds.

This can be as simple as clapping your hands or knocking on a door. There are plenty of other everyday sounds you can try as well—for instance, running a faucet or a clicking light switch.

You can also try running some appliances such as a microwave or vacuum. How do all the different sounds compare? Which ones are the loudest? Find out how distance from the sound source affects the sound level. Try to find a relatively constant sound such as a running faucet or a person humming.

Start out with the phone right next to the source and then slowly walk away. How does the decibel level change as you get farther away? Try measuring background noise levels in different locations. Take the phone into different rooms, a library or to a playground or park. Where is the quietest place you can find? The loudest? Are noise levels loud enough anywhere that they could pose a danger to your hearing? You can also download apps to measure the frequency, or pitch, of sounds.

Frequency is measured in hertz Hz. The range of human hearing is from about 20 to 20, Hz. As we get older we tend to lose our ability to hear sounds at the higher end of that range. Some animals, such as dogs, can hear all the way up to 45, Hz.

What’s the frequency range of your voice? What about all the other sounds you measured earlier? Measure the sounds made by various musical instruments. Observations and results Using everyday items you could probably measure sounds in the range of roughly 20 to 80 dB.

Loud appliances such as a vacuum cleaner or power tools could exceed 80 dB. Human screams can be quite loud, possibly exceeding dB as of March , the world record is dB!

You should also have found sound levels drop off quickly as you get farther from the source. People who will be very close to a consistently loud sound all day such as someone who mows lawns or works near jet engines for a living should wear hearing protection.

More to explore.

Go from Quantum to Cosmic

This highly-rated, free app turns your smartphone into a pre-calibrated, accurate and easily portable sound level meter. It has a standard. dB Meter is free app which provides professional-quality measurement results, calibrated using an actual Nor high-precision decibel meter. With dB Meter. Today we are looking at decibel meter apps to measure noise levels. have here is a professional level sound meter app with a free price tag.

Science with a Smartphone: Decibel Meter

Apple Watch Description “Decibel X” is one of very few noise meter apps on the market that has highly reliable, pre-calibrated measurements and supports dBA, dBC. It turns your iOS device into a professional sound level meter, precisely measures the sound pressure level SPL all around you. This extremely useful and beautiful tool will not only be a great tool for many uses but also bring you a lot of fun. Have you wondered how quiet is your room or how loud is a rock concert or sport event?

Categories

Decibel Meters vs. Sound Meter Apps – How accurate are they?

WATCH VIDEO: Decibel Sound Meter Pro

The National Institute for Occupational Safety and Health (NIOSH), part of the Centers for Disease Control and Prevention (CDC), developed the NIOSH Sound Level Meter (SLM) app for iOS devices to help promote better hearing health and prevention efforts. NIOSH developed the app. Ask an adult to help you search for a “decibel meter” or “sound meter” app on a smartphone or tablet. There are plenty of free options available. “Decibel X” is one of very few sound meter apps on the market that has highly reliable, pre-calibrated measurements and supports frequency weightings: ITU-R .

Download Free Software: Download Xampp For Windows 7 64 Bit | Torrent Download Downloader

Leave a Reply

Your email address will not be published. Required fields are marked *