ITM 207 Lecture Notes - Lecture 3: Extended Ascii, Lossless Compression, Huffman Coding
1 Apr 2016
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Document Summary
Information: data that has been organized or processed in a useful manner. Computers are multimedia devices, dealing with a vast array of information categories computers store, present, and help us modify: -numbers, text, audio, Data compression: reducing the amount of space needed to store a piece of data. Bandwidth: the number of bits or bytes that can be transmitted from one place to another in a fixed amount of time. Compression ratio: size of the compressed data divided by the size of the original uncompressed data. An analog signal continually fluctuates in voltage up and down. A digital signal has only a high or low state, corresponding to the two binary digits. All electronic signals (both analog and digital) degrade as they move down a line. The voltage of the signal fluctuates due to environmental effects. Digitize: the act of breaking information down into discrete pieces. Pulse-code modulation: variation in a signal that jumps sharply between two extremes.
