10 hours 41 minutes
So in this segment, we're gonna go over input devices
input device, a device that allows the user insert data into a P. C. It's not just data any kind of,
but it all comes down data. But we're also talk about such things as biometrics text data, amusing a mouse
pictures through a scanner.
First talk about keyboards, primary method of inserting data from the very beginning. Well, I guess he had punch cards at the very beginning. But after, after punch cards, keyboards around before mice.
So the common to connections are the P S to port, which has pretty much gone away. And now it's almost everything's USB. Most of these input devices are gonna be USB,
and sometimes, even though you'll see a wireless, it will also be USB. In the end, could you talk to USB dongle less? Use Bluetooth, which is a way of doing wireless networking at short range. Some some mice and keyboards will go over Bluetooth, and you have to either have a youth USB, Bluetooth tunggal
or your laptop computer has to have
Bluetooth built into it.
You can also see Bluetooth
keyboards for some mobile devices.
You see tablets might have most tablet to mobile devices have Bluetooth. So if you want to use a keyboard and a mouse with a tablet
look, you can, usually by a Bluetooth based
not many properties to a keyboard. The every keyboard just had the repeat delay, which the time required for a key to be held
till it starts repeating it. So write me A. It doesn't keep doing a how long you have to hold down A before it gives you another A and then the repeat rate. So when you're holding down a. How many days is going to give you
at what speeds that you hold down A. For two seconds, I'm gonna get two or three A's.
No, that's what the repeat Ray is, And the cursor blink rate is just how fast the cursor blinks when you're on,
when you're anywhere that you're an insert text,
it's an issues to be aware. Keyboards are basically environmental issues. There's not much that can go wrong with them. Besides keys breaking off for spilling stuff on him.
Biggest thing is spilling stuff on him endure a good way to get rid of dirt and a keyboard is compressed air. Boat out some keyboards,
most keyboards. You can usually remove some of the keys if you need to really get on theirs and scrub.
They make some keyboards now that you can totally submerged in water and clean.
But your best bet is just not spilling in the first place. Probably the most common
causes for feeble keyboard failures.
Mouser mice Multiple Mel says Point device used to navigate very common
two main types. The first type was bald mice. You don't see those much anymore. There's a circular ball inside that tracks your movement and then optical mice.
SoBe. Almost like the one pictured here.
Easier state clogged up Really easy because it's a physical object that's tracking your movements. So as physical objects going across the table a lot, it's gonna start picking up dirt and grime. And
biggest Cosme l function on these were
was dirt building upon the malice. You have to take the cover off like you see in the picture. Here, take the ball out clean, and sometimes you have to clean the rollers
inside to Gil Nasty. We'll film on it.
I am so glad those were gone.
Now it was all mice are optical mice replaced the ball mouse requires a lot less maintenance, and the other thing with the ball mouth that I didn't mention on the slide, though, is
Obama's hat. You could use it on pretty much.
It works better when you had on a surface like a mouse pad, because it gave more friction to call it the most move. So the male spot wouldn't move really well on a table because it was very smooth.
Well, what's the optical mouse we start using, eh? Ladies and lasers, And they've gotten refined enough now that you can use a mouse almost on any surface besides glass or mirror, which will reflect light. But you can use it on almost any other surface, and you will be on track your movements. So Mels pads and pretty much spend kind of ah, gone away
like you're even bother with
nose pads anymore.
What we're talking about mice. I don't have a slice of this, but
another kind of input device would be such a cz. The clicker I'm using for these slides. This this works just like a mouse. I'm not moving stuff, but when I hit the buttons on this clicker, it's translating them into a left or right mouse. Click on the software, another kind of input device, and this ultimately goes back to a USB dongle plugged into a computer.
Now receive the wireless signals. From this
scanners. Everyone would have a scanner. It depends on what your needs to convert physical documents, such as a photo or a document like
paperwork or form
into something that the computer can use a graphic of some type.
Most of them come with some kind of custom software to be able to use
the scanner with various OS is
so the limitations are older. Scanners might not have support for the neuro S is if they don't make updated drivers for them and cross platform compatibility between, say, Lennox and Windows. Sometimes they won't work unless
the vendor makes a driver for it.
Windows has a interface called Twain.
That's kind of a default interface for dealing with scanners.
Kind of provides translation between the hardware and applications at the OS level.
Quality of scanners based off five main attributes the resolution
colored up grayscale connection and spent scan speed.
The resolution is just like when we're talking about moderns. How good the quality looks, how good the images. The higher the resolution, the better the image is gonna look on the monitor and the same applies for scanner scanner is basically a camera
that's gonna take that image in turn into a graphical format.
The higher the resolution, the bigger the image is gonna be.
So that's consideration. It's also take longer to scan if it has a higher resolution.
Color depth is will also increase the quality of the picture number of bits of information you describe each individual dot much like a monitor. Same kind of concept,
he said. A higher color depth. You're gonna get a better quality image and also a bigger file size. But if you're not doing photos and you're just doing a document, then you don't need all those extra color depth. You don't need the exercise and then you want to do something then then we're dealing with the grayscale depth.
And that's just how many shades of gray. So you're dealing with the very basic document that's in black and white. You can have this value set really low, too,
and a lot of organizations will have policies that say, when you scan documents, scanned the Met this setting because we want to make at a little colored at a lower race K depth, grayscale depth
and with a low resolution, because we're just dealing with text.
And I'll also make the files easier to move around the network
scanners usually attached to computers via FireWire, scuzzy and mostly USB ports. That's what you're gonna see most them as USB ports. Almost everything uses us banal for input devices,
and again the speed is reflected it fast. It'll go fast if you have a low resolution, though color depth through low grayscale depth. Take a lot less time to scan because not analyzing the document is thoroughly.
But if you have a high details that could take a lot longer to scan
biometrics, another big input device
we'll go over a couple of different kinds of biometrics here.
First one's the finger and palm print biometric where
it takes you put your finger on a scanning type device and I'll analyze the unique patterns of your fingerprint or your entire palm.
Help identify use usually used for access to buildings or is a second form of authentication along with your username. Passports. You can do
two forms of the dedication. So someone stole your password. They still would be a lot again, unless they also had your hand
sincere. A highly accurate with 57 2nd response time and good acceptability.
What do we mean by good acceptability? Acceptability means how well it's received by the users. So when we're talking about biometrics and you'll see this a lot, there's an acceptability kind of unofficial acceptability. Scan
acceptability scale, which is, you know,
does a person find it to use because we're talking about biometrics were talking about personal physical features. A lot of people aren't comfortable
sharing stuff like fingerprints of stuff. Fingerprints don't seem to be a problem, so that as a good acceptability,
retina scans where it looks at the blood vessels in the back of your eyes.
with 42nd response time. But this has poor acceptability, as opposed to the iris scan, which matches the color of your eyes and has a 1 to 2 second response time but has good. So the reason the difference between the poor and the good acceptability is our scan can usually done from
a relatively good distance.
But to get a good retina scan, you have to put your head right up to some kind of device that you put that actually your eye sits around to get or
really close to your face. And a lot of people don't like that. I mean hygienic reasons in just personal space. People don't like that. So that's why that has a poor acceptability rating,
voice recognition, measured vocal inflection, tone and pitch. It's not very accurate and slow, but that does have a good acceptability
now. It's not very accurate because it's easy for someone is like I could have a cold and my voice changed a lot, and the software doesn't know that
or you're excited like I am. I start talking really loud.
It's just it's not as easy to do.
And you probably noticed that if you've ever used any kind of voice recognition software
for your phone or on a computer trying to talk to it and have it transcribed what you say,
they use the same technology, and it's not that very accurate. So if you if you need to be more accurate than you're seeing there you can see why it's not.
It doesn't work that well.
Facial recognition where it kind of looks at all the contours on your face
that needs to measure at least 14 of 80 facial features. It's accurate and very fast.
Could be done in real time but has mixed acceptability. So hasn't mixed acceptability because of not just access reasons, but
kind of like If you ever see in the movies where they could do real time, you're walking around and they could do recognition of your face and right away, like locate you in a database and know where you are from. A
close camera, close circuit camera.
So a lot of people have issues with privacy when it comes to facial recognition, storing your face and where you've been
keystroke dynamics, not as common measure. The timings of key presses think it kind of like a signature. Everyone kind of has their own unique way of timing, how long it takes
every person they have their own little keys, that they have a little harder find on a keyboard than everyone else that we kind of have their own style of typing. It's really it's based off characteristics, not
actual words, just kind of looked at your
analyze your behavior for typing. And this also has miss acceptability because the same reasons as the facial, where there's a lot of concerns over. Okay, are you capturing just my style, or are you actually capturing what I'm typing?
And that's that falls into the privacy
Then Senator Dynamics is measuring pressure, speed, direction, same as s. So you're basically just doing your signature on
electronic device like you do with your credit card at the store,
and it's been well accepted. Everyone uses their signature every day for life stuff, so it's not Benny. It's well, very well accepted.
Another kind of input devices. A barcode reader
purposes to read you peces.
Not just you See these in the store all the time. Skins. Your item know the price puts into the register.
A non commercial environment could be used for tracking assets
in your enterprise, so every device, every computer might have a bar code on it. And then you'd use these bar code readers to identify that PC and stored in a database
usually connected via USB, just like everything else.
Two main kinds of bar code readers, the Hand scanner
and Penn Scanner Pretty self explanatory
touch screens have become a lot more prevalent nowadays with mobile technology. You see, a lot of almost all our mobile devices now are completely touch screen,
but you can also see it in monitors now monitors air coming touchscreen allow the new OS is our touch enabled
que viene keyboard video mouth switch. That's what K V M stands for. Ebel's multiple systems reviewed, interacted by a single keyboard, malice and monitor. So this kind of the
other end of virtual ization we're doing multiple lessons on one host Now we're using a single keyboard and mouse and sometimes even a monitor
toe access multiple physical machines. So
most common place you see, this is probably when dealing with servers.
You go into a
data center. You have rows and rows of servers need to be able to access one of them. You have a K V M switch that has
all the different monitors. All the modern outputs in all the keyboard and
outputs from those individual machines will all run back into a box like this. And then you basically pushed the box. You push the button for which machine you want of you. At that time, it'll show up on the monitor.
Now, with law, the more Mar No s is being remote enabled, meaning that you can access them over the network. Katie, EMS
are really only used as a last resort. If you actually have to touch the hardware, you actually look at the main screen. You can't get to remotely anymore
if you have six piece. If you have six machines in Iraq, you're not gonna have six keyboards, six monitors and six mice
Game pads in joysticks,
usually connected via USB. You don't see it by cereal anymore. It used be cereal before us speed was so prevalent.
Game passion like you see on any gaming systems. They also make him for PCs
and enjoy sticks. You don't see joysticks as much anymore, but used for flight simulators. Mainly,
it's in a dry stick in a long time.
Digitize er, also known as a pen tablet. So this is really more geared towards artists,
so it allows you to use a stylist to actually draw,
um, used an auto cad type architecture. Also Seacon. It's hard to do accurate drawings with the mouse. So to make it more natural for actual artwork, you'd use a digitize er,
Do you have you have a stylist? That's what this little pen device looks like. It's not an actual pen, and it detects the pressure,
indirection and location where you when you draw on this tablet screen and that translates into a graphical format,
the pressure is important if you're doing artwork because with shading and stuff depends on how much pressure you use on the pen, so pressure is an important one, too.
Be ordered to detect
These are very common, usually by a USB typically used for video teleconferencing.
Sometimes they're built into the actual monitor,
and sometimes they're built into the actual laptop also,
so you won't have a separate USB cable. They come in a very high range and come to your basic one that just sits on your top. Your monitor S O. The higher end ones will do motion detection where they turn on when they see presence walking. You know they'll turn on automatically if someone walks in from, and then even so, the more higher and ones will have
Advanced zoom capabilities will also like to move them
motor up. They'll have motor so that you could do the software, make it turn till
and do all that kind of stuff from the software.
And this one very basic. If you wanna you wanna do, zoom and focus, you have to turn the little *** on the front. And then if you want to change direction, you have to move it with your hand, as opposed to the advanced ones that you can do that automatically
and some some contract you
like move as you move your head
have come quite a long ways.