Chapter 4A: Video and Sound

Chapter 4A Video and Sound McGraw-Hill Technology Copyright © 2006 by The McGraw-Hill Companies, Inc. All  Monitors Most common output device Connects to the video card Categorized by color output – Monochrome One color with black b...

Chapter 4A Video and Sound McGraw-Hill Technology Copyright © 2006 by The McGraw-Hill Companies, Inc. All  Monitors Most common output device Connects to the video card Categorized by color output – Monochrome One color with black background – Grayscale Weakest amount of light (Black) Varying degrees of gray grayscale display carries an amount of light, ranging from the weakest amount of light, or black, to the strongest amount of nt of light, or white. ou a m st ite) – Color ro e ng Wh ( s t ht g Display 4 to 16 million colors li 4A-2 Monitors  Monitors CRT color – Phosphor dots arranged in triads – Red, green, and blue dots – Three colors blend to make colors – Varying the intensity creates new colors CRT color  Monitors CRT drawbacks – Very large – Very heavy – Use a lot of electricity  Monitors Liquid Crystal Display (LCD) – A liquid crystal display (LCD) monitor is a computer monitor or display that uses LCD technology to show clear images and is found mostly in laptop computers and flat panel monitors.  Monitors- Passive matrix LCD Passive matrix LCD – Passive-matrix is an LCD technology that uses a grid of vertical and horizontal wires to display an image on the screen. – Pixels are arranged in a Grid (to make an image) – Pixels are activated indirectly (rows and Column are activated) – Animation can be blurry – Narrow view angle – Pixels do not refresh quickly – Color display is determined by electricity coming from transistors at the end of the row and top of the column. The intersection of the columns and rows are the pixels Monitors- Passive matrix LCD Monitors- Active-matrix LCD Active-matrix LCD – Each pixel is activated directly – Pixels have 4 transistors One each for red, green, blue One for opaqueness (denseness) – Animation is crisp and clean – Quick Pixel Refresh Rate – Wide view angle Monitors- Active-matrix LCD  Monitors Drawbacks to LCD – More expensive than CRT – Must sit directly in front of screen – Can be more fragile than CRT Monitors and Video Cards Monitors impacts user effectiveness Monitors should have – Crisp text – Clear graphics – Adjustable controls – Clear edges Monitors and Video Cards Size of monitor – Measured in inches – Measured diagonally – Actual size Distance from corner to corner – Viewable size Useable portion of the screen  Monitors and Video Cards Resolution – The number of horizontal and vertical pixels on a display screen. The more pixels, the more information is visible without scrolling. Standard Display Resolution Sizes. Name(s) Resolution in pixels High Definition (HD) 1280 x 720 Full HD, FHD 1920 x 1080 2K, Quad HD, QHD 2560 x 1440  Concept of Aspect Ratio The aspect ratio of an image is the ratio of its width to its height and is expressed with two numbers separated by a colon, such as 16:9, sixteen-to-nine. Concept of Aspect Ratio Monitors and Video Cards Refresh rate – Number of time the screen is redrawn – Modern equipment sets this automatically – Improper settings can cause eyestrain  Video Cards Device between the CPU and monitor Better cards result in better output Removes burden of drawing from CPU Have their own processor and RAM Modern cards have up to 8 GB RAM GPU- RTX- https://www.techpowerup.com/gpu- specs/geforce-rtx-3080.c3621 Capable of execution of 3D images  Data Projectors Replaced overhead and slide projectors Project image onto wall or screen LCD projectors – Most common type of projector – Small LCD screen – Very bright light – Require a darkened room  Data Projectors Digital Light Projectors – A series of mirrors control the display – May be used in a lighted room  Sound Systems Integral part of the computer experience Capable of recording and playback  Sound Systems Sound card – Device between the CPU and speakers – Converts digital sounds to analog – Can be connected to several devices – Modern cards support Dolby Surround Sound  Sound Systems Headphones and headsets – Replacement for speakers and microphones – Offer privacy – Does not annoy other people – Outside noise is not a factor – Headsets have speakers and a microphone  Chapter 4A End of Chapter McGraw-Hill Technology Copyright © 2006 by The McGraw-Hill Companies, Inc. All