Peripherals It is the generic name given to all

Transcript:Peripherals It is the generic name given to all:
Peripherals It is the generic name given to all input, output, and secondary storage devices that are part of a computer system but are not the part of the CPU. Input tech. Pointing Devices An input device used to control a pointer on the screen is called a pointing device. A pointer is a small symbol that appears on the screen in a graphical user interface. Input tech. now provide a more natural user interface for computer users. Types of Pointing Devices Mouse Stylus Trackball: This holds a large moving ball on the top. The body of the trackball is not moved. The ball is rolled with fingers. The position of the cursor on the screen is controlled by rotating the ball. Touchpad A touchpad is a small, plane surface over which the user moves his finger. The user controls the movement of the cursor on the screen by moving his fingers on the touchpad. It is also known as a track-pad. Touch screen The touch screen is a video display screen that receives input from the touch of a finger. The screen is covered with a plastic layer. There are undetectable beams of infrared light at the back of the screen. In order to enter data, the user touches icons or menus on the screen. Most touch screen computer use sensors to detect the touch of a finger. Light Pen It is connected by a wire to the computer. It has a device at the tip that emits light. The pen sends information to the computer when a user touches the pen on certain areas of a specially designed screen. Usually used by engineers, graphics designers and illustrators. Speech Recognition Systems It is the ability of a machine or program to identify words and phrases in spoken language and convert them to a machine-readable format. Speech recognition works using algorithms through acoustic and language modeling. Acoustic modeling represents the relationship between linguistic units of speech and audio signals; language modeling matches sounds with word sequences to help distinguish between words that sound similar. Speech Recognition Systems Some of the newest speech recognition products are Amazon Alexa and Google Home. These devices are capable of voice recognition and interaction, play music, help in completing to-do lists, setting the alarm ON/OFF, playing audio books, providing weather, traffic, sports, and other real time information. These devices can also control other smart devices