If you live in a loud environment, and noise pollution is a problem even when you are trying to get some sleep, you might find relief by using a white noise machine. It may sound like you are just adding even more noise, and in a way you are, but these devices are designed for noise masking. They drown out the other irritating background noises by creating a wash of white noise similar to a fan or rushing water. These noise generators are not actually active noise cancelling devices, but they serve a similar purpose.
One of the most popular sleep noise generators is the Marpac 980A. This is the cylindrical plastic unit you may have seen before. The volume and the frequency tone can be changed by turning the cap of the plastic housing one way or the other. This model has two speeds, so you can easily control how much white noise you want added to your room. These units make a very consistent sound, without annoying rattling or vibrations. It generates pure white noise, not a prerecorded pattern. Many people swear by these units, and use them every night. In fact I know several of them, and I have used it myself. If you are looking for a very durable white noise generator at an affordable price, this one is highly recommended. Try it out and get the sleep you have been missing!
The process of canceling out any unwanted sound is known as noise cancellation. Noise cancellation technology is a field in acoustics that is continually growing. The modern world is filled with lots of various noises and much of it can be quite dangerous to our eardrums. But the people who live in major cities and large towns are the most susceptible to this particular type of hearing damage. They experience very little quiet time in their lives, so noise cancellation technology is a great way for these people to experience less noise in their lives throughout their day.
We are now going to take a look at the working principles of noise cancellation technology. Sound will travel through water or air in the form of waves and each and every wave comes with its own particular frequency, size and shape. A microphone is capable of detecting all of these sound waves in any particular environment. If you place a microphone close to the ear and incorporate a digital sound processor called active noise control into the system, the resulting sound coming from the speaker in headphones or earbuds has the undesired sound wave frequencies reduced or eliminated. This type of signal processor takes the ambient sounds outside of the headphones, and reverses the phase of the sound waves, thereby cancelling out those sounds.
Noise cancelling earbuds and headphones are readily available in today’s marketplace. People who work in airports and factories will often wear these type of headphones as a way to save their eardrums from being damaged by the loud noises taking place around them. These headphones are also used by people listening to audio devices like mp3 players, ipods, and stereo systems as a means to reduce ambient noise, thereby they are able to listen to their programs at a lower volume level. Noise cancellation technology is also great for traveling, and are frequently worn by airline passengers.
Noise is everywhere. We are surrounded by it at all times, especially in the city. Noise pollution from traffic, trains, planes, garbage trucks, barking dogs, and so much more. What can be done? Are we supposed to just accept living in such a loud environment?
Thankfully, there are noise reduction products available to help make our lives a little more tolerable. Noise cancellation technology is still pretty new, but noise cancelling earbuds and headphones, telephone headsets, white noise generators for sleep, and other products are emerging that promise to help bring some solace to our loud, loud world. Here we will take a look at some of these products, and the science behind modern noise reduction.
Noise cancelling headphones and headsets are sometimes called active headsets because they require a separate power source to operate. More often than not the power source that they use are rechargeable battery packs that you can get at any of your local electronic stores, though some use common disposable batteries. Typically, consumer noise cancellation technology focuses on lower-frequency sound, which is easier to isolate, like the drone of an airplane engine. Higher frequency sounds are more difficult to process and eliminate.