Noise cancelating headphones

Sometimes we drop a lot of our cash in a pair of noise cancelling headphones, but how much do we know about them. To understand this you don’t have to be master of physics, just the knowledge of your school will help.

As we all know sound travels in a form of a wave, which has crest (the upper most part) and a trough (the lower most part).

And when two identical wave meet the give ride to a stronger wave and this my friends is the job of two speaker to amplify the sound reaching you.

To cancel out sound your headphones uses more sound, when a Christ of a sound of one wave meet the trough of another wave of same frequency they cancel out then selves.

To do all this your headphones actually analyse the background noise and produce the anti-noise, but with all this hardware come some disadvantages, they are noose cancelling headphones are heavier than the normal once and they need power to do all this so they need batteries. Some of them don’t even work with batteries. There are many more factors that also elects the sound such as sound bleeding which is due to the cushion use.

Now you are little bit smatter than other people in noise cancelling headphones.

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NAS

The topic today is about something that if it died you will be much more upset than your game
crashing at a match, and its storage. Now this isn’t a hard drive examination but some background
knowledge will help. A modern consumer grad hard drive spans at anywhere from around 5400
revolutions per min to 10000 revolutions per minute. Its head hovers around nanometres to write or
read the data, it’s basically a miracle that you can buy less than than a zillion dollars.
With a miracle, which you can buy. With some good things come bad things also, so sometimes the
die.
RAID can help. But raid uses multiple
drives as backups in case one of them dies. The issue is each raid array requires multiple drives and a
raid cars, and that can work in a desktop pc but now a days homes have many desktops and many
laptops. So setting up raid in them will me expensive and you need multiple harder’s to store all your
data. And laptops can’t hold multiple drives.
And that’s where a nas or a network attached storage comes in the rescue that small little boxes
holds form 1 hard drive to a large raid configuration which act as a safe central storage hub for all
your data and as they are attached to a the network they can be accessed remotely. And from a
multiple clients means they can be accessed from a many pc and mobile devices.
They also run their own operating systems with which you can do crazy stuff like nightly backups of
all your pc’s and photos backups at of all mobile devisee. Some of them run Linus also access your
data from anywhere from the world, early accessible data from anywhere from the world just using
a web browser or a mobile app easily and securely share file with others and many more.
After hearing these things you will say ok, if I want my data on the go why can’t I use something like
drop box or google drive. Hold on my friend get seated and prepare yourself for the ride my friend.
The coolest thing about a nas or a personal cloud as sellers like to call is you can scale you own
capacity of storage without paying any monthly fee, no companies seeing your stuff. It’s all is kept
on your own server that’s belongs to you and you the master of that server.
Sounds cool right, hold on my friend
Using a nas doesn’t means that you are backing up your data. First, raid is just redundancy which
protects against hard drive fliers and backup means two or more copies of the same data in different
locations and backups can protects against viruses, accidental deletion, hard wearer failed etc.
So in a typical home situation, get a two bay nas and set it up at raid 1, so you will get data
redundancy and in a external hard drive backup that nas regularly.
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