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Flat-panel Monitors Flat-panel moni
Flat-panel Monitors
Flat-panel monitors are the most widely used type of monitor today. Compared to other types, they are thinner, are more portable, and require less power to operate.
Many of today's flat-panel monitors are LCD(liquid crystal display). There are two basic types: passive-matrix and active-matrix. Passive-matrix or dual-scan monitors create images by scanning the entire screen. This type requires very little power, but the claruty of the images is not as sharp. Acitve-matrix or thin film transistor (TFT) monitors do not scan down the screen; instead, each pixel is independently activated. They can display more colors with better clarity. Activematrix monitors are more expensive and require more power.
OLED ( organic light-emitting diode ) is a newer technology and is becoming widely used. Unlike LCD, OLED technology has the benefits of lower power consumption and longer battery life, as well as possibilities for much thinner displays.
Cathode-Ray Tubes
Just a few years ago, the most common type of monitor for the office and the home was the cathode-ray tube (CRT). These monitors are typically placed directly on the system unit or on the desktop. CRTs are similar in size and technology to older televisions. Compared to other types of monitors, their primary advantages are low cost and excellent resolution. Their primary disadvantages are that they are bulky, are less energy efficient, and occupy a considerable amount of space on the desktop.
Discarded CRTs are a serious threat to our environment. Each color CRT contains approximately four pounds of lead and numerous other hazadous materials.Don't just throw out an obsolete CRT. Dispose of it in a responsible manner through an EPA-certified recycling program. Most large cities and manufactuners including IBM, Microsoft, and Dell have certified programs.
Other monitors
There are sevetal other types of monitors. These monitors are used for more specialized applications, such as reading books, making presentations, and watching television. Three of these specialized devices are book readers, data projectors, and high-definition televison.
E-book readers are handheld, book-size devices that display text and graphics. To learn more about one of the most widely used e-book readers, see Making IT Word for You: Amazon Kndle on page 203. Using content downloaded from the Web or from special cartridges, these devices are used to read newspapers, magazines, and entire books. These diveces use a special type of screen called electronic paper or e-paper that requires power only when changing pages, and not the entire time a page is displayed on the screen.
Data projectors are specialized devices similar to slide projectors, These devices, however, connect to microcomputers and project computer output just as it would appear on a monitor. Data projectors are commonly used for presentations almost anywhere from the classroom to the boadroom.
High-definition television (HDTV) delivers a much clearer and more detailed wide-screen picture than regular television. Because the ouput is digital, usesr can readily freeze video sequences to create high-quality still images. The video and stil images can then be digitized, edited, and stored on disk for later use. This technology is very useful to graphic artists, designers, and publishers. One the most recent and dramatic advances is 3D HDTV. Using special viewing glasses, 3D HDTV provides theater-quality three-dimensional viewing.
Printers
You probably use a printer with some frequency to print homework assignments, photographs, and Web pages. Printers translate information that has been processed by the system unit and present the information on paper.Printer output is often called hard copy.
Features
There are many diffenrent types of printers.Almost all, however, have some basic distinguishing features, including resolution, color capability, speed, memory, nad duplex printing.
Resolution for a printer is similar to monitor resolition. It is a measure of the clarity of images produced. Printer resolution, however, is measured in dpi (dots per inch). Most printers desgigned for personal use average 1.200 dpi. The higher the dpi, the better the quality of images produced.
Color capability is provided by most printers today. Users typically have the option to print either with just black ink or with color. Because it is more expensive to print in color, most users select black ink for letters,drafts, and homework. Color is used more selectively for final reoirts containing graphics and for photographs.
Speed is measuerd in the number of pages printed per minute. Typically, printers for personal use average 15 to 19 pages per minute for single-color (black) output and 13 to 15 pages per minute for color output.
Memory within a printer is used to store printing instructions and documents waiting to be printed. The more memory in a printer, the faster it will be able to create large documents.
Ink-Jet Printers
Ink-jet printers spray ink at high speed onto the surface of paper. This process not only produces a letter-quality image but also premits printing to be done in a variety of colors, making them ideal for select special applications. Ink-jet printers are the most widely used printers. They are reliable quiet, and relatuvely inexpensive. The most costly aspect of ink-jet printers is replacing the ink cartridges. For this reason, most users specify black ink for the majority of print jobs and use the more expensive color printing for select applications. Typical ink-jet printers produce 17 to 19 pages per minute of black-only output and 13 to 15 pages of color output.
Laser Printers
The laser printer uses a technology similar to that used in a photocopying machine. Laser printers use a laser light beam to produce images with excellent letter and graphics quality. More expensive than ink-jet printers, laser printers are faster and are used in applications requiring high-quality output.
There are two categories of laser printers. Personal laser printers are less ecpensive and are used by many single users. They typically can print 15 to 17 pages a minute. Shared laser printers typically support color, are more expensive, and are used (share) by a group of users. Shared laser printers typically print over 50 pages a minute.
Other phinters
There are several other types of printers. These printers include dot-matrix printers, thermal printers, plotters,photo printers, and portable printers:
Dot-matrix printers form characters and images using a series of small oins on a print head. Once a widely used microcomputer printer, they are inexpensive and reliable bit quite noisy. In genaral, they are used for tasks where high-quality output is not required.
Thermal printers use heat elements to produce images on heat-sensitve paper. These printers are widely used with ATMs and gasoline pumps to print rexeipts.
Plotter are special-purpose printers for producing a wide range of specialized output. Using output from graphics tablets and other graphical input devices, plotters are typically used by graphic artists, enginieers, and architects to print out designsm sketches, and drawings.
Photo printers are spcial-purpose printers designed to print photo quality images from digital cameras. Most photo printers print 3x5" or 4x6" images on glossy, photo- quality paper.
Portable orinters are usually small and lightweight printers designed to work with a note book computer. Portable printers may be ink-jet or laser printers, print in black and white or color, and connect with USB.
Audio-output devices
Audio-output devices translate audio information from the computer into sounds that people can understand. The most widely used audio-output devices are speakers and headsets. These devices are conected to a sounds that people can understand. The most widely used audio-output devices are speakers and headsets. These devices are connected to a sound card in the system unit. The sound card is used to capture as well as play back recorded sounds. Audio-output devices are used to play music, vocalize translations fro one language to another, and communicate information form the computer system to users.
Creating voice output is not anywhere near as difficult as recognizing and interpreting voice input. In fact, voice input. In fact, voice output is quite common. It is used with many soft-drink machines, telephones, and cars. It is used as a reinforcement tool for learning, such as to help students study a foreign language. It also is used in many supermarkets at the checkout counter to confirm purchases.One of its mots powerful capabilities is to assist the physically challenged.
digital music players, also known as digital media players, are specialized devices for storing, transferring and playing audio files. Olfer players are only able to play music saved in a special compressed audio file format known as MP3.Today, most players are able to use a wide variety of audio files. Many are capable of displaying video files as well. Some of the best-known audio and video players are the Apple iPod, Creative Zen, Microsoft Zune, and iRiver.
Flat-panel monitors are the most widely used type of monitor today. Compared to other types, they are thinner, are more portable, and require less power to operate.
Many of today's flat-panel monitors are LCD(liquid crystal display). There are two basic types: passive-matrix and active-matrix. Passive-matrix or dual-scan monitors create images by scanning the entire screen. This type requires very little power, but the claruty of the images is not as sharp. Acitve-matrix or thin film transistor (TFT) monitors do not scan down the screen; instead, each pixel is independently activated. They can display more colors with better clarity. Activematrix monitors are more expensive and require more power.
OLED ( organic light-emitting diode ) is a newer technology and is becoming widely used. Unlike LCD, OLED technology has the benefits of lower power consumption and longer battery life, as well as possibilities for much thinner displays.
Cathode-Ray Tubes
Just a few years ago, the most common type of monitor for the office and the home was the cathode-ray tube (CRT). These monitors are typically placed directly on the system unit or on the desktop. CRTs are similar in size and technology to older televisions. Compared to other types of monitors, their primary advantages are low cost and excellent resolution. Their primary disadvantages are that they are bulky, are less energy efficient, and occupy a considerable amount of space on the desktop.
Discarded CRTs are a serious threat to our environment. Each color CRT contains approximately four pounds of lead and numerous other hazadous materials.Don't just throw out an obsolete CRT. Dispose of it in a responsible manner through an EPA-certified recycling program. Most large cities and manufactuners including IBM, Microsoft, and Dell have certified programs.
Other monitors
There are sevetal other types of monitors. These monitors are used for more specialized applications, such as reading books, making presentations, and watching television. Three of these specialized devices are book readers, data projectors, and high-definition televison.
E-book readers are handheld, book-size devices that display text and graphics. To learn more about one of the most widely used e-book readers, see Making IT Word for You: Amazon Kndle on page 203. Using content downloaded from the Web or from special cartridges, these devices are used to read newspapers, magazines, and entire books. These diveces use a special type of screen called electronic paper or e-paper that requires power only when changing pages, and not the entire time a page is displayed on the screen.
Data projectors are specialized devices similar to slide projectors, These devices, however, connect to microcomputers and project computer output just as it would appear on a monitor. Data projectors are commonly used for presentations almost anywhere from the classroom to the boadroom.
High-definition television (HDTV) delivers a much clearer and more detailed wide-screen picture than regular television. Because the ouput is digital, usesr can readily freeze video sequences to create high-quality still images. The video and stil images can then be digitized, edited, and stored on disk for later use. This technology is very useful to graphic artists, designers, and publishers. One the most recent and dramatic advances is 3D HDTV. Using special viewing glasses, 3D HDTV provides theater-quality three-dimensional viewing.
Printers
You probably use a printer with some frequency to print homework assignments, photographs, and Web pages. Printers translate information that has been processed by the system unit and present the information on paper.Printer output is often called hard copy.
Features
There are many diffenrent types of printers.Almost all, however, have some basic distinguishing features, including resolution, color capability, speed, memory, nad duplex printing.
Resolution for a printer is similar to monitor resolition. It is a measure of the clarity of images produced. Printer resolution, however, is measured in dpi (dots per inch). Most printers desgigned for personal use average 1.200 dpi. The higher the dpi, the better the quality of images produced.
Color capability is provided by most printers today. Users typically have the option to print either with just black ink or with color. Because it is more expensive to print in color, most users select black ink for letters,drafts, and homework. Color is used more selectively for final reoirts containing graphics and for photographs.
Speed is measuerd in the number of pages printed per minute. Typically, printers for personal use average 15 to 19 pages per minute for single-color (black) output and 13 to 15 pages per minute for color output.
Memory within a printer is used to store printing instructions and documents waiting to be printed. The more memory in a printer, the faster it will be able to create large documents.
Ink-Jet Printers
Ink-jet printers spray ink at high speed onto the surface of paper. This process not only produces a letter-quality image but also premits printing to be done in a variety of colors, making them ideal for select special applications. Ink-jet printers are the most widely used printers. They are reliable quiet, and relatuvely inexpensive. The most costly aspect of ink-jet printers is replacing the ink cartridges. For this reason, most users specify black ink for the majority of print jobs and use the more expensive color printing for select applications. Typical ink-jet printers produce 17 to 19 pages per minute of black-only output and 13 to 15 pages of color output.
Laser Printers
The laser printer uses a technology similar to that used in a photocopying machine. Laser printers use a laser light beam to produce images with excellent letter and graphics quality. More expensive than ink-jet printers, laser printers are faster and are used in applications requiring high-quality output.
There are two categories of laser printers. Personal laser printers are less ecpensive and are used by many single users. They typically can print 15 to 17 pages a minute. Shared laser printers typically support color, are more expensive, and are used (share) by a group of users. Shared laser printers typically print over 50 pages a minute.
Other phinters
There are several other types of printers. These printers include dot-matrix printers, thermal printers, plotters,photo printers, and portable printers:
Dot-matrix printers form characters and images using a series of small oins on a print head. Once a widely used microcomputer printer, they are inexpensive and reliable bit quite noisy. In genaral, they are used for tasks where high-quality output is not required.
Thermal printers use heat elements to produce images on heat-sensitve paper. These printers are widely used with ATMs and gasoline pumps to print rexeipts.
Plotter are special-purpose printers for producing a wide range of specialized output. Using output from graphics tablets and other graphical input devices, plotters are typically used by graphic artists, enginieers, and architects to print out designsm sketches, and drawings.
Photo printers are spcial-purpose printers designed to print photo quality images from digital cameras. Most photo printers print 3x5" or 4x6" images on glossy, photo- quality paper.
Portable orinters are usually small and lightweight printers designed to work with a note book computer. Portable printers may be ink-jet or laser printers, print in black and white or color, and connect with USB.
Audio-output devices
Audio-output devices translate audio information from the computer into sounds that people can understand. The most widely used audio-output devices are speakers and headsets. These devices are conected to a sounds that people can understand. The most widely used audio-output devices are speakers and headsets. These devices are connected to a sound card in the system unit. The sound card is used to capture as well as play back recorded sounds. Audio-output devices are used to play music, vocalize translations fro one language to another, and communicate information form the computer system to users.
Creating voice output is not anywhere near as difficult as recognizing and interpreting voice input. In fact, voice input. In fact, voice output is quite common. It is used with many soft-drink machines, telephones, and cars. It is used as a reinforcement tool for learning, such as to help students study a foreign language. It also is used in many supermarkets at the checkout counter to confirm purchases.One of its mots powerful capabilities is to assist the physically challenged.
digital music players, also known as digital media players, are specialized devices for storing, transferring and playing audio files. Olfer players are only able to play music saved in a special compressed audio file format known as MP3.Today, most players are able to use a wide variety of audio files. Many are capable of displaying video files as well. Some of the best-known audio and video players are the Apple iPod, Creative Zen, Microsoft Zune, and iRiver.
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Phẳng-bảng điều khiển màn hình Phẳng-bảng điều khiển màn hình rất loại màn hình, được sử dụng rộng rãi nhất hiện nay. So với các loại khác, họ mỏng hơn, hơn xách tay, và yêu cầu ít năng lượng để hoạt động.Nhiều người ngày nay phẳng-bảng điều khiển màn hình là LCD (màn hình tinh thể lỏng). Có hai loại cơ bản: ma trận thụ động và hoạt động-ma trận. Ma trận thụ động hoặc kép-quét màn hình tạo ra hình ảnh bằng cách quét toàn bộ màn hình. Loại này đòi hỏi quyền lực rất ít, nhưng claruty của các hình ảnh không phải là như sắc nét. Acitve-ma trận hoặc màng mỏng bóng bán dẫn (TFT) màn hình không quét xuống màn hình; thay vào đó, mỗi điểm ảnh độc lập được kích hoạt. Họ có thể hiển thị nhiều màu sắc với sự rõ ràng tốt hơn. Activematrix màn hình đắt tiền hơn và yêu cầu nhiều quyền lực hơn.Màn hình OLED (organic ánh sáng - emitting diode) là một công nghệ mới hơn và trở thành sử dụng rộng rãi. Không giống như màn hình LCD, màn hình OLED công nghệ có những lợi ích của thấp hơn tiêu thụ điện năng và dài tuổi thọ pin, cũng như khả năng cho nhiều màn hình mỏng hơn.Cathode - Ray ốngChỉ là một vài năm trước đây, các loại phổ biến nhất của màn hình cho văn phòng và nhà là cathode - ray tube (CRT). Các màn hình thường được đặt trực tiếp trên các đơn vị hệ thống hoặc trên bàn làm việc. CRT cũng giống như trong kích thước và công nghệ truyền hình cũ. So với các loại khác của màn hình, lợi thế chính của họ là rẻ và tuyệt vời giải quyết. Nhược điểm chính của họ là họ được cồng kềnh, có ít năng lượng hiệu quả, và chiếm một số lượng đáng kể của không gian trên bàn làm việc.Bị loại bỏ CRT là một mối đe dọa nghiêm trọng đến môi trường của chúng tôi. Mỗi màu sắc màn hình CRT chứa khoảng bốn pounds dẫn đầu và rất nhiều các tài liệu hazadous.Không chỉ ném ra một màn hình CRT cũ. Vứt bỏ nó một cách chịu trách nhiệm thông qua một chương trình tái chế EPA chứng nhận. Các thành phố lớn nhất và manufactuners bao gồm IBM, Microsoft, và Dell đã chứng nhận chương trình.Màn hình khácKhông có sevetal các loại màn hình. Các màn hình được sử dụng cho các ứng dụng chuyên biệt hơn, chẳng hạn như đọc sách, làm cho bài thuyết trình, và xem truyền hình. Ba trong số các thiết bị chuyên ngành là cuốn sách bạn đọc, máy chiếu dữ liệu và độ nét cao televison.E-book đọc có thiết bị cầm tay, cuốn sách-kích thước Hiển thị văn bản và đồ họa. Để tìm hiểu thêm về một số được sử dụng rộng rãi nhất e-book đọc, hãy xem làm cho nó từ cho bạn: Amazon Kndle trên trang 203. Sử dụng nội dung tải về từ Web hoặc từ hộp mực đặc biệt, các thiết bị này được sử dụng để đọc báo, tạp chí, và toàn bộ sách. Các diveces sử dụng một loại đặc biệt của màn hình được gọi là giấy điện tử hoặc e-giấy đòi hỏi sức mạnh chỉ khi việc thay đổi trang, và không phải toàn bộ thời gian một trang được hiển thị trên màn hình.Máy chiếu dữ liệu là đặc biệt thiết bị tương tự như trượt máy chiếu, các thiết bị này, Tuy nhiên, kết nối với microcomputers và dự án sản lượng máy tính cũng giống như nó sẽ xuất hiện trên một màn hình. Máy chiếu dữ liệu thường được sử dụng cho bài thuyết trình hầu như bất cứ nơi nào từ lớp học để boadroom.Truyền hình độ nét cao-(HDTV) cung cấp một nhiều rõ ràng hơn và chi tiết hơn màn hình rộng hình ảnh hơn truyền hình thường xuyên. Bởi vì ouput kỹ thuật số, usesr có thể dễ dàng đóng băng video trình tự để tạo ra hình ảnh vẫn còn chất lượng cao. Những hình ảnh video và stil có thể sau đó được số hóa, chỉnh sửa, và lưu trữ trên đĩa để sử dụng sau này. Công nghệ này là rất hữu ích cho các nghệ sĩ đồ họa, thiết kế, và các nhà xuất bản. Một gần đây và kịch tính tiến bộ là 3D HDTV. Sử dụng đặc biệt xem ly, 3D HDTV cung cấp chất lượng nhà hát ba chiều xem.Máy inBạn có thể sử dụng một máy in với một số tần suất in bài tập về nhà, bức ảnh, và các trang Web. Máy in dịch thông tin đã được xử lý bởi các đơn vị hệ thống và trình bày thông tin trên giấy.Máy in ra thường được gọi là bản sao cứng.Tính năngCó rất nhiều phương loại máy in.Hầu như tất cả, Tuy nhiên, có một số tính năng cơ bản để phân biệt, bao gồm độ phân giải, màu sắc khả năng, tốc độ, bộ nhớ, nad song in ấn.Giải pháp cho một máy in là tương tự như giám sát resolition. Nó là một thước đo độ rõ nét của hình ảnh được sản xuất. Máy in độ phân giải, Tuy nhiên, được đo bằng dpi (dots per inch). Hầu hết máy in desgigned cho sử dụng cá nhân trung bình 1.200 dpi. Cao hơn dpi, thì tốt hơn sản xuất chất lượng của hình ảnh.Màu sắc khả năng được cung cấp bởi hầu hết các máy in vào ngày hôm nay. Người dùng thông thường có tùy chọn để in với mực chỉ đen hoặc với màu sắc. Bởi vì nó là tốn kém hơn để in màu, hầu hết người dùng chọn mực đen cho thư, bản thảo, và bài tập ở nhà. Màu sắc được sử dụng nhiều lựa chọn cho cuối cùng reoirts có đồ họa và hình ảnh.Tốc độ là measuerd số lượng trang in cho phút. Thông thường, máy in cho sử dụng cá nhân trung bình 15-19 trang / phút cho màu sắc đơn đầu ra (đen) và 13-15 trang / phút cho màu đầu ra.Bộ nhớ trong một máy in được sử dụng để lưu trữ in hướng dẫn và tài liệu đang chờ để được in. Bộ nhớ thêm trong một máy in, nhanh hơn nó sẽ có thể tạo ra tài liệu lớn.Máy bay phản lực mực máy inMáy bay phản lực mực máy in phun mực độ cao lên bề mặt của giấy. Quá trình này không chỉ sản xuất một hình ảnh thư mà còn premits in phải được thực hiện trong một loạt các màu sắc, làm cho chúng lý tưởng cho các ứng dụng đặc biệt chọn. Máy bay phản lực mực máy in là các máy in được sử dụng rộng rãi nhất. Họ là đáng tin cậy yên tĩnh, và relatuvely không tốn kém. Các khía cạnh tốn kém nhất của máy bay phản lực mực máy in thay thế hộp mực. Vì lý do này, hầu hết người dùng chỉ định mực đen cho phần lớn các công việc in và sử dụng in màu đắt tiền hơn để chọn các ứng dụng. Điển hình máy bay phản lực mực máy in sản xuất 17-19 trang / phút của sản lượng chỉ có màu đen và 13-15 trang của sản lượng màu sắc.Máy in laserMáy in laser sử dụng một công nghệ tương tự như được sử dụng trong máy Photocopy. Máy in laser sử dụng một tia ánh sáng laser để sản xuất hình ảnh với thư tuyệt vời và chất lượng đồ họa. Đắt tiền hơn so với máy bay phản lực mực máy in, máy in laser nhanh hơn và được sử dụng trong các ứng dụng đòi hỏi phải có chất lượng cao sản lượng.Không có hai loại máy in laser. Máy in laser cá nhân ít hơn ecpensive và được sử dụng bởi nhiều người sử dụng duy nhất. Họ thường có thể in trang 15-17 phút. Chia sẻ máy in laser thông thường hỗ trợ màu, có nhiều tốn kém, và được sử dụng (chia sẻ) bởi một nhóm người dùng. Chia sẻ máy in laser thường in trên 50 trang một phút.Khác phintersCó rất nhiều các loại máy in. Những máy in bao gồm dot-ma trận máy in, máy in nhiệt, Máy vẽ, ảnh máy in và máy in di động:Dot-ma trận máy in mẫu nhân vật và hình ảnh bằng cách sử dụng một loạt các nhỏ oins trên một đầu in. Một khi máy in được sử dụng rộng rãi vi, họ là không tốn kém và đáng tin cậy chút khá ồn ào. Trong tổng, chúng được sử dụng cho các nhiệm vụ nơi cao chất lượng đầu ra là không cần thiết.Máy in nhiệt sử dụng yếu tố nhiệt để sản xuất các hình ảnh trên giấy nhiệt-sensitve. Các máy in được dùng rộng rãi để in rexeipts với máy ATM và máy bơm xăng.Máy vẽ là máy in chuyên dụng cho sản xuất một loạt các chuyên ngành đầu ra. Sử dụng các đầu ra từ đồ họa máy tính bảng và thiết bị đầu vào khác đồ họa, Máy vẽ được thường được sử dụng bởi các nghệ sĩ đồ họa, enginieers, và kiến trúc sư để in ra designsm phác thảo, và bản vẽ.Máy in ảnh là mục đích spcial máy in được thiết kế để in ảnh chất lượng hình ảnh từ máy ảnh kỹ thuật số. Hầu hết các máy in ảnh in 3 x 5" hoặc 4 x 6" hình ảnh trên giấy bóng, chất lượng hình ảnh.Cầm tay orinters thường là máy in nhỏ và nhẹ, được thiết kế để làm việc với một máy tính sổ ghi chú. Máy in di động có thể là máy bay phản lực mực in hoặc máy in laser, in trong màu đen và màu trắng hoặc màu, và kết nối với USB.Thiết bị đầu ra âm thanhThiết bị đầu ra âm thanh dịch âm thanh thông tin từ máy tính vào âm thanh mà mọi người có thể hiểu. Thiết bị đầu ra âm thanh được sử dụng rộng rãi nhất là loa và tai nghe. Các thiết bị được kết nối với một âm thanh mà mọi người có thể hiểu. Thiết bị đầu ra âm thanh được sử dụng rộng rãi nhất là loa và tai nghe. Các thiết bị được kết nối với một card âm thanh trong các đơn vị hệ thống. Card âm thanh được sử dụng để nắm bắt, cũng như phát lại âm thanh được ghi lại. Thiết bị đầu ra âm thanh được sử dụng để chơi âm nhạc, vocalize bản dịch fro một ngôn ngữ khác, và giao tiếp thông tin mẫu hệ thống máy tính cho người dùng.Tạo giọng nói đầu ra không phải là bất cứ nơi nào gần như khó khăn là công nhận và giải thích giọng nói. Trong thực tế, giọng nói đầu vào. Trong thực tế, sản lượng thoại là khá phổ biến. Nó được sử dụng với nhiều đồ uống nhẹ máy, điện thoại và xe hơi. Nó được sử dụng như một công cụ tăng cường cho việc học tập, chẳng hạn như để giúp sinh viên học một ngôn ngữ nước ngoài. Nó cũng được sử dụng trong nhiều siêu thị tại quầy kiểm tra để xác nhận mua hàng.Một khả năng mạnh mẽ mots là để hỗ trợ các thách thức về thể chất.máy nghe nhạc kỹ thuật số, cũng được gọi là kỹ thuật số phương tiện truyền thông người chơi, có các thiết bị đặc biệt để lưu trữ, chuyển giao và chơi các tập tin âm thanh. Olfer người chơi chỉ có thể chơi nhạc được lưu trong một định dạng đặc biệt tập tin nén âm thanh được biết đến như MP3.Ngày nay, hầu hết người chơi có thể sử dụng một loạt các tập tin âm thanh. Nhiều người có khả năng hiển thị các file video là tốt. Một số nổi tiếng nhất âm thanh và video cầu thủ là Apple iPod, Creative Zen, Microsoft Zune, và iRiver.
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Flat-panel Monitors
Flat-panel monitors are the most widely used type of monitor today. Compared to other types, they are thinner, are more portable, and require less power to operate.
Many of today's flat-panel monitors are LCD(liquid crystal display). There are two basic types: passive-matrix and active-matrix. Passive-matrix or dual-scan monitors create images by scanning the entire screen. This type requires very little power, but the claruty of the images is not as sharp. Acitve-matrix or thin film transistor (TFT) monitors do not scan down the screen; instead, each pixel is independently activated. They can display more colors with better clarity. Activematrix monitors are more expensive and require more power.
OLED ( organic light-emitting diode ) is a newer technology and is becoming widely used. Unlike LCD, OLED technology has the benefits of lower power consumption and longer battery life, as well as possibilities for much thinner displays.
Cathode-Ray Tubes
Just a few years ago, the most common type of monitor for the office and the home was the cathode-ray tube (CRT). These monitors are typically placed directly on the system unit or on the desktop. CRTs are similar in size and technology to older televisions. Compared to other types of monitors, their primary advantages are low cost and excellent resolution. Their primary disadvantages are that they are bulky, are less energy efficient, and occupy a considerable amount of space on the desktop.
Discarded CRTs are a serious threat to our environment. Each color CRT contains approximately four pounds of lead and numerous other hazadous materials.Don't just throw out an obsolete CRT. Dispose of it in a responsible manner through an EPA-certified recycling program. Most large cities and manufactuners including IBM, Microsoft, and Dell have certified programs.
Other monitors
There are sevetal other types of monitors. These monitors are used for more specialized applications, such as reading books, making presentations, and watching television. Three of these specialized devices are book readers, data projectors, and high-definition televison.
E-book readers are handheld, book-size devices that display text and graphics. To learn more about one of the most widely used e-book readers, see Making IT Word for You: Amazon Kndle on page 203. Using content downloaded from the Web or from special cartridges, these devices are used to read newspapers, magazines, and entire books. These diveces use a special type of screen called electronic paper or e-paper that requires power only when changing pages, and not the entire time a page is displayed on the screen.
Data projectors are specialized devices similar to slide projectors, These devices, however, connect to microcomputers and project computer output just as it would appear on a monitor. Data projectors are commonly used for presentations almost anywhere from the classroom to the boadroom.
High-definition television (HDTV) delivers a much clearer and more detailed wide-screen picture than regular television. Because the ouput is digital, usesr can readily freeze video sequences to create high-quality still images. The video and stil images can then be digitized, edited, and stored on disk for later use. This technology is very useful to graphic artists, designers, and publishers. One the most recent and dramatic advances is 3D HDTV. Using special viewing glasses, 3D HDTV provides theater-quality three-dimensional viewing.
Printers
You probably use a printer with some frequency to print homework assignments, photographs, and Web pages. Printers translate information that has been processed by the system unit and present the information on paper.Printer output is often called hard copy.
Features
There are many diffenrent types of printers.Almost all, however, have some basic distinguishing features, including resolution, color capability, speed, memory, nad duplex printing.
Resolution for a printer is similar to monitor resolition. It is a measure of the clarity of images produced. Printer resolution, however, is measured in dpi (dots per inch). Most printers desgigned for personal use average 1.200 dpi. The higher the dpi, the better the quality of images produced.
Color capability is provided by most printers today. Users typically have the option to print either with just black ink or with color. Because it is more expensive to print in color, most users select black ink for letters,drafts, and homework. Color is used more selectively for final reoirts containing graphics and for photographs.
Speed is measuerd in the number of pages printed per minute. Typically, printers for personal use average 15 to 19 pages per minute for single-color (black) output and 13 to 15 pages per minute for color output.
Memory within a printer is used to store printing instructions and documents waiting to be printed. The more memory in a printer, the faster it will be able to create large documents.
Ink-Jet Printers
Ink-jet printers spray ink at high speed onto the surface of paper. This process not only produces a letter-quality image but also premits printing to be done in a variety of colors, making them ideal for select special applications. Ink-jet printers are the most widely used printers. They are reliable quiet, and relatuvely inexpensive. The most costly aspect of ink-jet printers is replacing the ink cartridges. For this reason, most users specify black ink for the majority of print jobs and use the more expensive color printing for select applications. Typical ink-jet printers produce 17 to 19 pages per minute of black-only output and 13 to 15 pages of color output.
Laser Printers
The laser printer uses a technology similar to that used in a photocopying machine. Laser printers use a laser light beam to produce images with excellent letter and graphics quality. More expensive than ink-jet printers, laser printers are faster and are used in applications requiring high-quality output.
There are two categories of laser printers. Personal laser printers are less ecpensive and are used by many single users. They typically can print 15 to 17 pages a minute. Shared laser printers typically support color, are more expensive, and are used (share) by a group of users. Shared laser printers typically print over 50 pages a minute.
Other phinters
There are several other types of printers. These printers include dot-matrix printers, thermal printers, plotters,photo printers, and portable printers:
Dot-matrix printers form characters and images using a series of small oins on a print head. Once a widely used microcomputer printer, they are inexpensive and reliable bit quite noisy. In genaral, they are used for tasks where high-quality output is not required.
Thermal printers use heat elements to produce images on heat-sensitve paper. These printers are widely used with ATMs and gasoline pumps to print rexeipts.
Plotter are special-purpose printers for producing a wide range of specialized output. Using output from graphics tablets and other graphical input devices, plotters are typically used by graphic artists, enginieers, and architects to print out designsm sketches, and drawings.
Photo printers are spcial-purpose printers designed to print photo quality images from digital cameras. Most photo printers print 3x5" or 4x6" images on glossy, photo- quality paper.
Portable orinters are usually small and lightweight printers designed to work with a note book computer. Portable printers may be ink-jet or laser printers, print in black and white or color, and connect with USB.
Audio-output devices
Audio-output devices translate audio information from the computer into sounds that people can understand. The most widely used audio-output devices are speakers and headsets. These devices are conected to a sounds that people can understand. The most widely used audio-output devices are speakers and headsets. These devices are connected to a sound card in the system unit. The sound card is used to capture as well as play back recorded sounds. Audio-output devices are used to play music, vocalize translations fro one language to another, and communicate information form the computer system to users.
Creating voice output is not anywhere near as difficult as recognizing and interpreting voice input. In fact, voice input. In fact, voice output is quite common. It is used with many soft-drink machines, telephones, and cars. It is used as a reinforcement tool for learning, such as to help students study a foreign language. It also is used in many supermarkets at the checkout counter to confirm purchases.One of its mots powerful capabilities is to assist the physically challenged.
digital music players, also known as digital media players, are specialized devices for storing, transferring and playing audio files. Olfer players are only able to play music saved in a special compressed audio file format known as MP3.Today, most players are able to use a wide variety of audio files. Many are capable of displaying video files as well. Some of the best-known audio and video players are the Apple iPod, Creative Zen, Microsoft Zune, and iRiver.
Flat-panel monitors are the most widely used type of monitor today. Compared to other types, they are thinner, are more portable, and require less power to operate.
Many of today's flat-panel monitors are LCD(liquid crystal display). There are two basic types: passive-matrix and active-matrix. Passive-matrix or dual-scan monitors create images by scanning the entire screen. This type requires very little power, but the claruty of the images is not as sharp. Acitve-matrix or thin film transistor (TFT) monitors do not scan down the screen; instead, each pixel is independently activated. They can display more colors with better clarity. Activematrix monitors are more expensive and require more power.
OLED ( organic light-emitting diode ) is a newer technology and is becoming widely used. Unlike LCD, OLED technology has the benefits of lower power consumption and longer battery life, as well as possibilities for much thinner displays.
Cathode-Ray Tubes
Just a few years ago, the most common type of monitor for the office and the home was the cathode-ray tube (CRT). These monitors are typically placed directly on the system unit or on the desktop. CRTs are similar in size and technology to older televisions. Compared to other types of monitors, their primary advantages are low cost and excellent resolution. Their primary disadvantages are that they are bulky, are less energy efficient, and occupy a considerable amount of space on the desktop.
Discarded CRTs are a serious threat to our environment. Each color CRT contains approximately four pounds of lead and numerous other hazadous materials.Don't just throw out an obsolete CRT. Dispose of it in a responsible manner through an EPA-certified recycling program. Most large cities and manufactuners including IBM, Microsoft, and Dell have certified programs.
Other monitors
There are sevetal other types of monitors. These monitors are used for more specialized applications, such as reading books, making presentations, and watching television. Three of these specialized devices are book readers, data projectors, and high-definition televison.
E-book readers are handheld, book-size devices that display text and graphics. To learn more about one of the most widely used e-book readers, see Making IT Word for You: Amazon Kndle on page 203. Using content downloaded from the Web or from special cartridges, these devices are used to read newspapers, magazines, and entire books. These diveces use a special type of screen called electronic paper or e-paper that requires power only when changing pages, and not the entire time a page is displayed on the screen.
Data projectors are specialized devices similar to slide projectors, These devices, however, connect to microcomputers and project computer output just as it would appear on a monitor. Data projectors are commonly used for presentations almost anywhere from the classroom to the boadroom.
High-definition television (HDTV) delivers a much clearer and more detailed wide-screen picture than regular television. Because the ouput is digital, usesr can readily freeze video sequences to create high-quality still images. The video and stil images can then be digitized, edited, and stored on disk for later use. This technology is very useful to graphic artists, designers, and publishers. One the most recent and dramatic advances is 3D HDTV. Using special viewing glasses, 3D HDTV provides theater-quality three-dimensional viewing.
Printers
You probably use a printer with some frequency to print homework assignments, photographs, and Web pages. Printers translate information that has been processed by the system unit and present the information on paper.Printer output is often called hard copy.
Features
There are many diffenrent types of printers.Almost all, however, have some basic distinguishing features, including resolution, color capability, speed, memory, nad duplex printing.
Resolution for a printer is similar to monitor resolition. It is a measure of the clarity of images produced. Printer resolution, however, is measured in dpi (dots per inch). Most printers desgigned for personal use average 1.200 dpi. The higher the dpi, the better the quality of images produced.
Color capability is provided by most printers today. Users typically have the option to print either with just black ink or with color. Because it is more expensive to print in color, most users select black ink for letters,drafts, and homework. Color is used more selectively for final reoirts containing graphics and for photographs.
Speed is measuerd in the number of pages printed per minute. Typically, printers for personal use average 15 to 19 pages per minute for single-color (black) output and 13 to 15 pages per minute for color output.
Memory within a printer is used to store printing instructions and documents waiting to be printed. The more memory in a printer, the faster it will be able to create large documents.
Ink-Jet Printers
Ink-jet printers spray ink at high speed onto the surface of paper. This process not only produces a letter-quality image but also premits printing to be done in a variety of colors, making them ideal for select special applications. Ink-jet printers are the most widely used printers. They are reliable quiet, and relatuvely inexpensive. The most costly aspect of ink-jet printers is replacing the ink cartridges. For this reason, most users specify black ink for the majority of print jobs and use the more expensive color printing for select applications. Typical ink-jet printers produce 17 to 19 pages per minute of black-only output and 13 to 15 pages of color output.
Laser Printers
The laser printer uses a technology similar to that used in a photocopying machine. Laser printers use a laser light beam to produce images with excellent letter and graphics quality. More expensive than ink-jet printers, laser printers are faster and are used in applications requiring high-quality output.
There are two categories of laser printers. Personal laser printers are less ecpensive and are used by many single users. They typically can print 15 to 17 pages a minute. Shared laser printers typically support color, are more expensive, and are used (share) by a group of users. Shared laser printers typically print over 50 pages a minute.
Other phinters
There are several other types of printers. These printers include dot-matrix printers, thermal printers, plotters,photo printers, and portable printers:
Dot-matrix printers form characters and images using a series of small oins on a print head. Once a widely used microcomputer printer, they are inexpensive and reliable bit quite noisy. In genaral, they are used for tasks where high-quality output is not required.
Thermal printers use heat elements to produce images on heat-sensitve paper. These printers are widely used with ATMs and gasoline pumps to print rexeipts.
Plotter are special-purpose printers for producing a wide range of specialized output. Using output from graphics tablets and other graphical input devices, plotters are typically used by graphic artists, enginieers, and architects to print out designsm sketches, and drawings.
Photo printers are spcial-purpose printers designed to print photo quality images from digital cameras. Most photo printers print 3x5" or 4x6" images on glossy, photo- quality paper.
Portable orinters are usually small and lightweight printers designed to work with a note book computer. Portable printers may be ink-jet or laser printers, print in black and white or color, and connect with USB.
Audio-output devices
Audio-output devices translate audio information from the computer into sounds that people can understand. The most widely used audio-output devices are speakers and headsets. These devices are conected to a sounds that people can understand. The most widely used audio-output devices are speakers and headsets. These devices are connected to a sound card in the system unit. The sound card is used to capture as well as play back recorded sounds. Audio-output devices are used to play music, vocalize translations fro one language to another, and communicate information form the computer system to users.
Creating voice output is not anywhere near as difficult as recognizing and interpreting voice input. In fact, voice input. In fact, voice output is quite common. It is used with many soft-drink machines, telephones, and cars. It is used as a reinforcement tool for learning, such as to help students study a foreign language. It also is used in many supermarkets at the checkout counter to confirm purchases.One of its mots powerful capabilities is to assist the physically challenged.
digital music players, also known as digital media players, are specialized devices for storing, transferring and playing audio files. Olfer players are only able to play music saved in a special compressed audio file format known as MP3.Today, most players are able to use a wide variety of audio files. Many are capable of displaying video files as well. Some of the best-known audio and video players are the Apple iPod, Creative Zen, Microsoft Zune, and iRiver.
đang được dịch, vui lòng đợi..
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