Chapter 8 Digital Media Computer Concepts 2013 8 Section A: Digital - - PDF document
12-11-27 Chapter 8 Digital Media Computer Concepts 2013 8 Section A: Digital Sound Digital Audio Basics Digital Audio File Formats MIDI Music Speech Recognition and Synthesis Chapter 8: Digital Media 2 8 Digital Audio
Ø Digital Audio Basics Ø Digital Audio File Formats Ø MIDI Music Ø Speech Recognition and Synthesis
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Ø Sampling a sound wave
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Ø Sampling rate refers to number of times per second that a sound is measured during the recording process
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Ø A sound card is a device that contains a variety of input and output jacks, plus audio-processing circuitry
Ø Integrated audio Ø Digital signal processor
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Ø The most popular digital audio formats include AAC, MP3, Ogg Vorbis, WAV, and WMA Ø Audio or media player software allows you to play digital audio files Ø You can embed digital audio files into a Web page using the HTML5 <audio> tag Ø Streaming audio plays as its file is downloaded
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Ø You can use audio converter software to change audio files from one format to another Ø Ripping is a slang term that refers to the process
computer’s hard disk
Ø The technical term is digital audio extraction
Ø Music is stored on CDs in a digital format, CDDA Ø During the ripping process, music in CDDA format is typically converted into a compressed format such as MP3, AAC, or WMA to reduce file size
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Ø Bitmap Basics Ø Scanners and Cameras Ø Image Resolution Ø Color Depth and Palettes Ø Image Compression
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Ø Composed of a grid of dots
Ø Color of each dot is stored as a binary number
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Ø Digital cameras use storage medium
Ø Solid state memory cards
Ø Transfer images using:
Ø Card readers Ø Direct cable transfer Ø Infrared port Ø Media transfer Ø Docking station Ø E-mail
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Ø Graphics software is used to modify or edit bitmap graphics
Ø Modify individual pixels to:
Ø Wipe out red eye Ø Erase rabbit ears Ø Retouch photographs
Ø Require a bit of storage space
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Ø When you increase the resolution of a bitmap, pixel interpolation may occur
Ø Some images may appear pixilated
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Ø Color depth is the number of colors available for use in an image
Ø Monochrome bitmap
Ø Increasing color depth increases file size
Ø True Color bitmap (24-bit bitmap) Ø 32-bit bitmap
Ø Color palettes are used to control color depth
Ø Grayscale palette Ø System palette Ø Web palette
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Ø Any technique that recodes data in an image file so that it contains fewer bits
Ø Lossless compression Ø Lossy compression
Ø Run-length encoding Ø File compression utility
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