What is Input Device | Types of Input Devices | Computer Devices
Summary
TLDR本视频课程介绍了计算机输入设备的种类和用途。主要讲解了键盘、鼠标、触摸屏、语音识别系统和数据扫描设备等功能和特点。键盘分为功能键、数字键和字母键,鼠标有多种类型如轨迹球、摇杆和激光鼠标。语音识别系统帮助残疾人通过语音输入数据,而数据扫描设备如图像扫描仪和光学字符识别(OCR)软件则将纸质文档转换为电子格式。此外,还介绍了条形码阅读器、磁墨字符识别(MICR)和电子卡读卡器等设备。
Takeaways
- 📱 键盘是标准输入设备,具有约101至214个键,分为功能键、数字键和字母数字键。
- 🔢 数字键区用于输入数字数据,可通过Num Lock键开启或关闭。
- ⌨️ 键盘上的字母数字键用于输入字符和数字数据,具有QWERTY布局。
- 🔑 特殊键包括页面上下移动、插入、删除等功能。
- 🠹 屏幕导航键,如箭头键,用于在屏幕上移动光标。
- 🖊️ 指点和绘图设备,如轨迹球、操纵杆、鼠标、光笔、触摸屏和数字化器。
- 🖱️ 鼠标是常用的指点设备,有线和无线两种,轮鼠标可快速滚动页面。
- 📱 触摸屏允许用户通过触摸屏幕直接输入数据。
- 🔊 语音识别系统将人的语音转换为文本,对残疾人特别有帮助。
- 📸 数据扫描设备,如图像扫描仪,将纸质文档转换为电子格式。
- 🖨️ OCR软件将扫描的文档图像转换为可编辑的文本格式。
Q & A
输入设备的主要作用是什么?
-输入设备的主要作用是将数据和指令输入到计算机中。
键盘设备通常有多少个键?
-标准的键盘设备通常有101到214个键。
键盘主要分为哪三个部分?
-键盘主要分为功能键区、数字键区和字母及符号键区。
功能键(F1到F12)有什么用途?
-功能键是可编程的,用于执行特定的存储功能,例如F1键通常用于帮助选项。
什么是点选设备?
-点选设备是一种输入设备,帮助用户快速指向并选择屏幕上显示的图标。
列举几种常见的点选设备。
-常见的点选设备包括轨迹球、操纵杆、鼠标、光笔、触摸屏和数字化仪。
触摸屏如何工作?
-触摸屏允许用户通过直接触摸显示屏上的数据来输入,非常简单易用。
语音识别系统的作用是什么?
-语音识别系统允许人们通过语音输入数据到计算机,将人声转换为文本。
图像扫描仪的主要用途是什么?
-图像扫描仪将纸质文档转换为电子格式,并存储在计算机中,用于保存重要文档。
光学字符识别(OCR)软件是如何工作的?
-OCR软件首先创建文档的图像,然后将该图像转换为计算机可解释的ASCII文本。
磁墨水字符识别(MICR)系统用于什么?
-MICR系统用于读取磁性编码字符,通常用于银行支票的处理。
机器视觉输入系统在工业设计中有什么应用?
-机器视觉输入系统用于设计工业机器人,它能识别其镜头范围内的视觉图像。
Outlines
🖥️ 输入设备概述
本段落介绍了输入设备的目的和种类,包括键盘、语音识别系统、指点设备和数据扫描设备。键盘作为标准输入设备,具有多种键区,如功能键、数字键和字母键。此外,还讨论了指点设备如鼠标、轨迹球、光笔和手写板的功能,以及它们如何帮助用户与计算机交互。
🖱️ 鼠标及其他指点设备
这一部分详细介绍了不同类型的鼠标,包括有线鼠标、无线鼠标、滚轮鼠标和激光鼠标,以及它们的功能和使用场景。还提到了轻笔,这是一种用于绘图的指点设备。触摸屏和数字化设备也被讨论,它们允许用户直接在屏幕上输入数据或将图像转换为数字形式。
📄 数据扫描与识别技术
本段内容聚焦于数据扫描设备,如图像扫描仪和光学字符识别(OCR)技术,以及它们如何将纸质文档转换为电子格式。同时,介绍了光学标记阅读器(OMR)、条形码阅读器、磁性墨水字符识别(MICR)和电子卡读卡器的作用。最后,探讨了机器视觉输入系统在工业机器人设计中的应用。
Mindmap
Keywords
💡输入设备
💡键盘
💡鼠标
💡触摸屏
💡语音识别系统
💡数据扫描设备
💡光学字符识别(OCR)
💡条形码阅读器
💡磁墨水字符识别(MICR)
💡电子卡阅读器
💡机器视觉输入系统
Highlights
描述了输入设备的目的,即输入数据和指令到计算机中。
区分了不同类型的输入设备,包括键盘设备、语音识别系统、指点设备和数据扫描设备。
详细介绍了键盘设备的组成部分,包括功能键、数字键、字母键和特殊键。
解释了指点设备如何帮助用户快速指向和选择屏幕上的图标。
列举了流行的指点设备,如轨迹球、操纵杆、鼠标、光笔、触摸屏和数字化仪。
描述了轨迹球和鼠标的工作原理及其在移动光标位置方面的应用。
介绍了光笔作为绘图工具的特点,以及它如何在屏幕上快速移动。
讨论了触摸屏的功能,允许用户直接通过触摸屏幕输入数据。
解释了语音识别设备如何将人声转换为文本,并对残疾人士特别有帮助。
介绍了数据扫描设备,如图像扫描仪和光学字符识别(OCR)软件。
说明了光学标记阅读器如何帮助评分客观题型的答题卡。
描述了条形码阅读器在商店中的应用,以及如何快速识别商品价格。
讨论了磁墨水字符识别(MICR)系统如何识别和处理印刷或手写的字符。
介绍了电子卡阅读器如何读取智能卡,例如信用卡或借记卡。
解释了机器视觉输入系统如何识别其镜头范围内的视觉图像,特别是在工业机器人设计中的应用。
Transcripts
this program comprises unit three input
devices after completion of this unit
you will be able to describe the purpose
of input devices distinguish between
different input devices have knowledge
about keyboard devices have knowledge
about speech recognition system have
knowledge about point and draw devices
have knowledge about date scanning
devices the input devices are used to
enter data and instructions into the
computer following are most widely used
input devices keyboard device keyboard
is a standard input device as readily
available for us to feed the data a
keyboard is similar to a conventional
typewriter with about 101 214 keys as
shown below a keyboard is divided into
three major parts function keys numeric
keys and phonetic numeric keys special
case and screen navigation keys function
keys function keys are twelve in number
labeled as f1 to f12 function keys are
programmable keys to perform a specific
stored function for example f1 key is
used for help option numeric keys
numeric keypad is very important for
entering numeric data a numeric keypad
is switched on and switched off by
pressing num lock key
it is mostly situated on the right side
of the keyboard
0 to 9 and plus/minus stearic slash and
enter keys are present in such a
keyboard a numeric keypad can also be
used for arrow keys and page up-and-down
tasks as mentioned on the keys
alphabetic and numeric keypad
alphanumeric keypad has alphabetic keys
and numeric keys this is a standard
keypad and is similar to a typewriter
these keys are used to type the
character data as well as numeric data
it has QWERTY keypad and is used to
enter a-to-z alphabets both in upper and
lowercase letters in the above keypad
alphabetic Keys 0 to 9 and numeric keys
are present and some symbols are printed
and can be used by using the shift key
special keys these are some keys
situated between alphanumeric and
numeric keypad and surround the
alphanumeric keypad as well these are
page up page down home and insert delete
and tab caps lock shift ctrl alt Windows
escape etc screen navigation keys these
are called
arrow keys situated between alphanumeric
and numeric keypad
these are for arrow keys like left right
up and down arrow keys these are used to
move cursor anywhere on the screen point
and draw devices point and draw device
is an input device which helps to
rapidly point and select an icon to
display on the screen some popular input
devices are trackball joystick mouse
light pen touchscreen and digitizer
trackball trackball trackball works just
like a mouse
tragg ball contains only one ball
instead of different buttons like left
or right etc trackball uses this fall to
move the cursor position from one
location to the other
trackball neither uses any such pad nor
covers much space joystick joystick is a
pointing device joystick is mostly used
by children to play their games it
consists of a handle which can be used
to move the object position left-right
and down joystick can also be attached
with the television set it uses USB or
special port supplied with sound card
for connection mouse mouse is a pointing
device a user can move pointer very
rapidly on the screen with the help of
mouse mouse controls the movements of
the cursor positions there is variety of
mouse available in the market for
example real Mouse lays amongst wireless
mouse etc wheel mouse wheel mouse
contains left/right buttons and a wheel
button at the middle wheel button is
used to scroll the pages up and down
very rapidly laser mouse laser mungs
uses the laser beam for its movement
laser mouse does not need any mouse pad
laser mouse is automatically activated
as it is attached with the computer
light pen light pen is a pointing device
which is used for making drawings light
pen rapidly moves on the screen just
like an ordinary pen but it works with
electricity light pen does not need any
alphabetic keys touchscreen touchscreen
enables the user to touch the data
directly by using fingers within the
display area
that screen is very simple and easy to
use currently it is also used in mobile
phones digitizer digitizer is used to
convert maps pictures and drawings into
a digital form to store in the computer
system a digitizer consists of a
digitizing tablet and a stylus pen
digitizing tablet is a flat surface on
which stylus or a pen is moved to draw
shapes pictures or maps etc speech
recognition device speech recognition
allows a person to input data to the
computer through speech speech
recognition device converts the human
voice into text
this device is specially helpful for
disabled people speech recognition has
the capability to first recognize words
with the help of software or a device
and then convert it into text or command
types of speech recognition system
single word speech recognition system
these systems recognize only single
words like hello yes/no at one time
continuous type of word speech
recognition system this type of speech
recognition system recognizes more than
one word or a complete sentence for
example hello how are you at one time
uses of speech recognition system speech
recognition systems are specially
helpful for disabled people who cannot
write it helps people who feel
comfortable in speech rather than
writing it facilitates a user in a
situation where he or she is unable to
edit or review a long text it also helps
the user who is quite busy and doesn't
want to type the data due to shortage of
time
data scanning devices image scanner an
image scanner translates the printed
documents into an electronic format and
stores them into the computer important
documents can be preserved in an
electronic form by using image scanner
for later use image scanners are further
classified into the following two types
flatbed scanner flatbed scanner is like
a photocopier machine with a glass sheet
flatbed scanners are also called desktop
scanners in a flatbed scanner the paper
is placed on a glass sheet and a light
source is moved horizontally from one
line to other line the process is
repeated until all the lines are
completed handheld scanners handheld
scanners work much like a flatbed
scanner but it works manually by the
user itself for scanning the documents
or products the scanner is dragged
slowly with its light on handheld
scanners are mostly used in shops to
scan the price of products optical
character recognition optical character
recognition is also called optical
character reader optical character
readers use a software called OCR
software OCR software the scanner first
creates an image of the document and
then the OCR software converts that
image into a SC to text computer
interprets the ASC two texts as letters
numbers and special characters om our
optical mark reader optical mark reader
has the capability to recognize the pre
mentioned marks either of a pen or a
pencil optical mark reader is
specifically helpful for making
objective type questions the student
mark the answer sheet by filling or
turning a circle oval shaped or square
this printed answer sheet is fed into
the computer and the grading is done by
using optical mark reader me see our
barcode reader it is normally used in
shops glossary stores etc this device
contains the photoelectric cells that
read barcodes consisting of lines having
different thickness barcode reader helps
shopkeepers to analyze the price of an
item immediately m.i.c are magnetic ink
character recognition m.i.c are is used
to read the magnetically encoded
characters m IC r is the system that
provides a full alphanumeric recognition
of printed or handwritten characters by
simply scanning the form a user scans
the data through a scanner which is
recognized by an engine of the OCR
system the m IC r converts the images
into machine readable characters
electronic card reader EC our electronic
card reader is used to scan ecards smart
cards like Visa card bank credit cards
etc an electronic card reader reads the
memory card of the ATM or debit card or
Visa card etc the memory card is in the
form of a black strip which is wiped
through an electronic card reader
machine vision input system vision input
system is one of the latest input
devices that recognize the vision image
which appears in the range of its lens
these are specially used to design
industrial robots
you
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