【文章內(nèi)容簡(jiǎn)介】 器上顯示的信息。鼠標(biāo)一般有三種設(shè)計(jì)：機(jī)械鼠標(biāo)、光電鼠標(biāo)和無線鼠標(biāo)。機(jī)械鼠標(biāo)是傳統(tǒng)和最廣泛使用的類型。這種鼠標(biāo)有導(dǎo)線連接到計(jì)算機(jī)系統(tǒng)，在光滑表面移動(dòng)鼠標(biāo)，底部的滾輪控制屏幕上的指示器，左右按鈕選擇項(xiàng)目。光電鼠標(biāo)沒有滾輪而是通過放射和感知光來探測(cè)鼠標(biāo)的活動(dòng)，可以用于任何表面。無線鼠標(biāo)以電池為動(dòng)力用電波或紅外線波與計(jì)算機(jī)系統(tǒng)通信。 What is Input? 掃描儀讀取文檔和圖形、圖像，然后把讀入信息轉(zhuǎn)換為計(jì)算機(jī)系統(tǒng)能夠處理的形式。掃描設(shè)備一般分為三種：光電掃描儀、條形碼讀卡機(jī)、 字符和標(biāo)志識(shí)別裝置。光電掃描儀復(fù)制彩色文本和圖像。條形碼讀卡機(jī)多用在超市讀取商品包裝上代表商品的條形碼，將商品信息輸入已經(jīng)儲(chǔ)存了各種商品最新價(jià)格的計(jì)算機(jī)，由計(jì)算機(jī)告訴電子收款機(jī)每種商品的價(jià)格。字符和標(biāo)志識(shí)別裝置能夠識(shí)別特殊的字符和標(biāo)志，屬于專業(yè)設(shè)備。例如，用在銀行中讀出含磁性物質(zhì)墨水寫出的字符。 圖像抓取設(shè)備用于創(chuàng)建或抓取原始影像。這些設(shè)備包括數(shù)碼相機(jī)和數(shù)碼攝像機(jī)等。數(shù)碼相機(jī)與傳統(tǒng)照相機(jī)的區(qū)別在于圖像以數(shù)字化形式復(fù)制在磁盤上或相機(jī)內(nèi)存中而不是膠片上。使用數(shù)碼相機(jī)可以在照相后立即在相機(jī)里看到還可以把照片發(fā)送到網(wǎng)頁上。數(shù)碼攝像機(jī)將動(dòng)畫以數(shù)字的形式存在磁盤上或攝像機(jī)內(nèi)存中。網(wǎng)頁鏡頭是專業(yè)的數(shù)碼攝像機(jī)，它能夠抓取圖像，然后將圖像通過因特網(wǎng)發(fā)送到計(jì)算機(jī)里 , 用于天氣預(yù)報(bào)和交通狀況通報(bào)。 聲頻輸入設(shè)備將聲音轉(zhuǎn)換為計(jì)算機(jī)能夠處理的形式。最廣泛使用的聲頻輸入設(shè)備是麥克風(fēng)。麥克風(fēng)、聲卡和特殊的軟件組成聲音識(shí)別系統(tǒng)，讓用戶能夠運(yùn)行計(jì)算機(jī)并用聲音指令創(chuàng)建文檔。此系統(tǒng)能夠連續(xù)幾小時(shí)錄音口授內(nèi)容，再連接計(jì)算機(jī)系統(tǒng)進(jìn)行編輯、儲(chǔ)存和打印。兩種著名的聲音識(shí)別系統(tǒng)是Dragon System的 Naturally Speaking 和 IBM公司的 Via Voice. What is Input? Reading Selection: Making Connections To connect online, your puter must be equipped with a modem, a device that translates the digital signals from your puter into analog signals that can travel over a standard phone line. Those are the scratchy sounds you hear from a modem39。s speaker. Believe it or not, there is actually meaning in all that noise. A modem on the other end of the line can understand it and converts the sounds back into digital information. Modems e in different speeds and are measured in bps or bits per second. A kbit/s modem sends data at 28,800 bits per second. A 56 kbit/s modem is twice as fast, sending and receiving data at a rate of 56,000 bits per second. Most modems today are 56 kbit/s. Why does speed matter? On the Inter, you are constantly exchanging data with other puters. Some of these digital files can be quite large. As you will soon learn, you want this exchange to happen as quickly as possible. If you are purchasing a modem, get the fastest one available. What is Input? Modems e in different speeds and can be installed inside your puter (internal), or connected to your puter39。s serial port (external). These days, almost all puters e equipped with an internal modem. But if you need to buy a modem for an older puter, consider purchasing an external one for two reasons. Firstly, they are much easier to install. Secondly, occasionally your modem will freeze and need to be reset. If your modem is external, you can simply turn it off and on again. If it39。s internal, the only way to reset it is to turn off your puter and reboot, which can take several minutes every time you need to reset your modem. To connect an external modem to your puter, you39。ll need a serial modem cable. The cables are usually not included when you buy a modem because there are several different sizes available. These can be purchased at any puter store where modems are sold. Most likely, your puter will have a connector on the back labeled serial, or with the IOIOIO icon. This connector es in a variety of formats: 9, 15, or 25 pins. If you only have one of these ports, it will probably be COM1. If you have two, one will be COM1, and the other will be COM2. After you plug in your modem, you can sign up for Inter Service. What is Input? Usually your setup program will try and find your modem and its COM port. If it can39。t, it will ask you which COM port your modem is attached to. If you don39。t know, the easiest thing to do is trying them all. Even if you only have two serial ports, you may be able to select one of four COM ports. Also, there are some other devices that use the COM ports. In some puters, the mouse is plugged into a serial port. This is known as a serial mouse. If you39。ve got a serial mouse plugged into COM1, then just plug the modem into COM2. If you don39。t have a second COM port, you can purchase a card that goes