{{Andrea Morales Leal #19Andrea Morales Leal #19

The Keyboard The Keyboard – The weird arrangement of letters dates – The weird arrangement of letters dates back to the earliest manual typewriters, the first one was back to the earliest manual typewriters, the first one was the QWERTY keyboard became standard equipment, the QWERTY keyboard became standard equipment, Ergonomic keyboard – place the keys at angles that are Ergonomic keyboard – place the keys at angles that are easier on your arms, ergonomic means to find another way easier on your arms, ergonomic means to find another way so that your wrists and fingers wont be affected, another so that your wrists and fingers wont be affected, another example is the wireless keyboard that doesnexample is the wireless keyboard that doesn’’t need a cable.t need a cable.

Pointing Devices Pointing Devices Mouse – It is designed to move a pointer Mouse – It is designed to move a pointer around the screen and point to specific characters or around the screen and point to specific characters or objects., another example is the wireless mice, that uses objects., another example is the wireless mice, that uses Bluetooth in the case of touch screen , the screen responds Bluetooth in the case of touch screen , the screen responds when you touch different screen regions. Also touch pad when you touch different screen regions. Also touch pad that is used in laptops that is used in laptops

Multi-touch Input devices Multi-touch Input devices – with this kind of device its – with this kind of device its possible to use multi-finger or multi-hand gestures to possible to use multi-finger or multi-hand gestures to accomplish complex tasks quickly like iPad or in iPhone they accomplish complex tasks quickly like iPad or in iPhone they also recognize the positions and the pressure neededalso recognize the positions and the pressure needed

List five input devices and three output List five input devices and three output devices that might be attached to a PC. devices that might be attached to a PC. Describe a typical use for each.Describe a typical use for each.

Reading tools Reading tools -pointing devices are really -pointing devices are really inefficient fro the input of large quantities of text inefficient fro the input of large quantities of text into computers, some examples are; scanner, into computers, some examples are; scanner, optical character recognition and pen scanners, optical character recognition and pen scanners, magnetic ink characteristics they identify and magnetic ink characteristics they identify and read the things, bar code readers, handwriting read the things, bar code readers, handwriting recognition devices used in ipads.recognition devices used in ipads.

Devices and Sensors Devices and Sensors – Because real-world – Because real-world information comes in so many forms, a variety information comes in so many forms, a variety of input devices have been designed for of input devices have been designed for capturing and digitizing information converting it capturing and digitizing information converting it into a digital form, Scanners, digital cameras are into a digital form, Scanners, digital cameras are some of the devices that some of the devices that ““replacereplace”” our sensors, our sensors, fil scanners are more advanced were the pixels fil scanners are more advanced were the pixels have more quality.have more quality.

Voice INPUT Speed recognition software can Voice INPUT Speed recognition software can convert voice data into words that can be edited convert voice data into words that can be edited and printedand printed

Inside the camera, the image is mapped onto a grid Inside the camera, the image is mapped onto a grid of tiny cells called pixels. Filters separate light into of tiny cells called pixels. Filters separate light into the three primary colors: the three primary colors: redred, , blueblue, and , and green green additive system (RGB MODEL) it is an optical additive system (RGB MODEL) it is an optical illusion the combination of colors. -color illusion the combination of colors. -color displaydisplay

Printed colors: subtractive synthesis: this Printed colors: subtractive synthesis: this doesn'tdoesn't’’t produce light, it reflects it, using the t produce light, it reflects it, using the colors CMYK (cyan magenta yellow and black) -colors CMYK (cyan magenta yellow and black) -color printingcolor printing

Digitizing involves using an input device such as a Digitizing involves using an input device such as a digital camera or recorder, they have bits that digital camera or recorder, they have bits that transfer the information into a videotransfer the information into a video

The combination of colors is a combination of The combination of colors is a combination of different pixelsdifferent pixels

The digital signal processor compresses the stream of The digital signal processor compresses the stream of bits and then it is transmitted to the CPUbits and then it is transmitted to the CPU

Image is made up of rows of colored pixelsImage is made up of rows of colored pixels Pixels are extremely small canPixels are extremely small can’’t be distinguishedt be distinguished MonitorMonitor’’s image is refreshed many times per second –s image is refreshed many times per second –

color displaycolor display

Screen output, Screen output, the display (also called monitor), serves as a one-the display (also called monitor), serves as a one-way window between the computer user and the machine. Images way window between the computer user and the machine. Images on a display are composed of tiny dots called pixels. on a display are composed of tiny dots called pixels. TodayToday’’s ,monitor is also likely to have a different aspect ratio than s ,monitor is also likely to have a different aspect ratio than the one it replaced, the aspect ratio is the fractional relationship the one it replaced, the aspect ratio is the fractional relationship between the width and height of a display. LCD square pixels are between the width and height of a display. LCD square pixels are better.better.

Paper Output –Paper Output –output displayed on a monitor, is immediate but output displayed on a monitor, is immediate but temporary. A printer can produce a hard copy on a paper of any temporary. A printer can produce a hard copy on a paper of any static information that can be displayed on the computer's screen. static information that can be displayed on the computer's screen. Non impact printer replace the impact printerNon impact printer replace the impact printer. Inkjet printer . Inkjet printer injects ink to the paper, Laser printers can print with laser beams by injects ink to the paper, Laser printers can print with laser beams by toner shades, subtractive colors cyan magenta and yellow. A toner shades, subtractive colors cyan magenta and yellow. A multifunction printer (all-in-one devices) usually combines a multifunction printer (all-in-one devices) usually combines a scanner, a laser or inkjet printer, and a fax modemscanner, a laser or inkjet printer, and a fax modem

Fax machines and Fax ModemsFax machines and Fax Modems –these are tools for long –these are tools for long distance copying of paper documents. When you send a fax of a distance copying of paper documents. When you send a fax of a paper document, the sending fax machine scans each page, paper document, the sending fax machine scans each page, converting the scanned image.converting the scanned image.

CD-RW drive you can read data, burn and write CD-RW drive you can read data, burn and write the times you want.the times you want.

CD-R is only to read, this disks are worm (write-CD-R is only to read, this disks are worm (write-once, read-many) you canonce, read-many) you can’’t erase data. -t erase data. -Storage devicesStorage devices

The Blu-ray has the highest-capacity The Blu-ray has the highest-capacity optical media option among the different optical media option among the different types of storage devicestypes of storage devices

ItIt’’s the only storage device that can s the only storage device that can contain HD video playable in many home contain HD video playable in many home theater systems.theater systems.

The Blu-ray discs have much more The Blu-ray discs have much more capacity than DVD discscapacity than DVD discs

Describe the advantages of storing your Describe the advantages of storing your data on Blu-ray discs instead of DVD data on Blu-ray discs instead of DVD discs. Are there any disadvantages?discs. Are there any disadvantages?

The are much more expensive than DVD The are much more expensive than DVD drives cant be used in CD or DVD drives. drives cant be used in CD or DVD drives. BD-rom AND BD-R discs canBD-rom AND BD-R discs can’’t be erased t be erased and rewrittenand rewritten

BD-RE discs must be reformatted before BD-RE discs must be reformatted before being rewrittenbeing rewritten

INPUTINPUT

Speech recognition: Speech recognition: software, a type of artificial intelligence, software, a type of artificial intelligence, can can convert voice data into words convert voice data into words that can be edited and that can be edited and printed, it can be used for printed, it can be used for any kind of business at workany kind of business at work, , especially for people that have brain injury, and have especially for people that have brain injury, and have difficulties difficulties using a keyboard, using a keyboard, it makes it easier. This digital recorder stores it makes it easier. This digital recorder stores digital audio signals on flash memory cards so that they can be digital audio signals on flash memory cards so that they can be transferred to a PC.transferred to a PC.Pen scanners:Pen scanners: they they’’re wireless scanners that can perform re wireless scanners that can perform character recognition on the fly, it creates a text file in it built-in character recognition on the fly, it creates a text file in it built-in memory, A pen scanner memory, A pen scanner can capture text from a printed can capture text from a printed document and transfer it to a PC document and transfer it to a PC usually usually used in stores and used in stores and libraries.libraries.In a Multitouch input device In a Multitouch input device , pictures pour out of a camera , pictures pour out of a camera phone placed on Microsoft Surface, where they can be phone placed on Microsoft Surface, where they can be stored, stored, rearranged and resized using simple hand gestures, rearranged and resized using simple hand gestures, pictures pictures of products can be taken with this device for an easier use because of products can be taken with this device for an easier use because it can be modifies the way you want.it can be modifies the way you want.

OUTPUTOUTPUT

Inkjet printers Inkjet printers spray ink directly onto paper to produce printed spray ink directly onto paper to produce printed text graphic images, these is used for printing black-and-white and text graphic images, these is used for printing black-and-white and color documents in color documents in offices and homes offices and homes , , Thermal printers Thermal printers are are typically used at typically used at sale terminals and gas pumps..sale terminals and gas pumps..44. Name and describe three special-purpose input . Name and describe three special-purpose input

devices and one output device people commonly use in devices and one output device people commonly use in public places, such as stores, banks and librariespublic places, such as stores, banks and libraries

A wireless miceA wireless mice, use Bluetooth or other wireless , use Bluetooth or other wireless frequencies to send their signals; the difference is that frequencies to send their signals; the difference is that they require batteries to power transmittersthey require batteries to power transmitters

Another Alternative is the Another Alternative is the touchpadtouchpad , with this device , with this device the user moves the pointer by dragging a finger across the user moves the pointer by dragging a finger across a small panel, this alternative is considered more a small panel, this alternative is considered more efficient and easier to handleefficient and easier to handle

A A touch screentouch screen, responds with the position, pressure, , responds with the position, pressure, and movement, can accomplish and work with the touch and movement, can accomplish and work with the touch of your fingers, of your fingers, replacing the mouse in handheld replacing the mouse in handheld computers, a easier way of workingcomputers, a easier way of working..

5. Many people find that the mouse is impractical for 5. Many people find that the mouse is impractical for use as a pointing device on a laptop computer. use as a pointing device on a laptop computer. Describe at least three alternativesDescribe at least three alternatives

Some of the advantages are that Some of the advantages are that flash memory flash memory can be used in most digital camera, recorders, can be used in most digital camera, recorders, and portable devices. Its also slightly cheaper and portable devices. Its also slightly cheaper than flash drive per GB of storage, in contrast than flash drive per GB of storage, in contrast of the hard disk that is not easily portable and of the hard disk that is not easily portable and make data more vulnerable to drive failure. make data more vulnerable to drive failure.

Disadvantages include that it is relatively Disadvantages include that it is relatively expensive per GB of storage. May require a expensive per GB of storage. May require a card reader to connect to computer and in card reader to connect to computer and in difference of the difference of the hard disk hard disk that is inexpensive that is inexpensive and has a relatively high capacity and is faster.and has a relatively high capacity and is faster.

6. What are the advantages and disadvantages 6. What are the advantages and disadvantages of flash memory devices over hard disks as of flash memory devices over hard disks as storage media?storage media?

Internal speakers , the majority of the PCs Internal speakers , the majority of the PCs have this option, play system sounds and have this option, play system sounds and spoken recordingspoken recording

Sound output jacks for headphones, Sound output jacks for headphones, powered speakers, and other audio output powered speakers, and other audio output devices, it has high-fidelity music devices, it has high-fidelity music playbackplayback

Headsets are particularly useful for Headsets are particularly useful for telephone and teleconfercing applications telephone and teleconfercing applications –output you can hear–output you can hear

7. Describe at least three common audio output 7. Describe at least three common audio output devices for PCs, and explain how each of them devices for PCs, and explain how each of them might be usedmight be used