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Unformatted text preview: COMM 202 EXAM 2 REVIEW Fall 2006 1. What are the differences between natural and electronic media? Electronic Media-add the ability to store events, record, duplicate, or process information Examples: computer disks, audio tape, video tape, DVDs, CDs, etc. Natural Media- events bound in time and space. Examples: Air, space, Differences- Electronic media has the ability to record, duplicate, process, synthesize information, as well as to convert it between radically different media. 2. What is Transduction? Give examples for Transduction working in both directions. Transduction-The conversion between one medium to another, usually utilizing a device (transducer) which converts one energy form to another. Examples: Microphones convert sound waves into electrical waves Speakers convert electrical waves into sound waves Video cameras convert light waves into electrical waves Monitors and projectors convert electrical waves into light waves 3. What are the advantages of electronic media? Advantages- Electronic media has the ability to record (store), duplicate, process (filtered, reversed, time-shifted, combined, sorted, distorted, etc.) synthesize information, as well as to convert it between radically different media. It can be implemented in both a linear and random access fashion. 4. Compare the memory of natural versus electronic media. Natural Media- Has limited or no memory. Waves move through natural media from stimulus to receptor. Electronic Media- Can be stored by moving the media past a stimulus in order to freeze the wave in the media. On playback, the media is moved past a receptor in order to reanimate the wave. 5. What does it mean to say that storage in electronic media requires alteration of one or more properties of the medium? Can make changes to hard drive, it is the same until you alter it again. Yet, for Cd that can’t be re written can’t be changed. Alteration is true of all communication mediums. If you write a message in mud with finger: While it is still mud it is easy to distort or destroy. However, once it is dry, it is less susceptible to meaningful change. The Printed Word: The message is ultimately stored as systematic alterations in the coloration of the paper. Then we can read it. It is different than what is was before. 6. Give brief definitions of decibel, frequency response, dynamic range, noise, signal-to-noise ratio, distortion, fidelity, and saturation. Decibel- Perceivable levels of sound and light cover such a vast range that logarithmic scale is used to measure them. A decibel is one tenth of a bel- a bel being a power ratio 10:1. Frequency Response- refers to the highest and lowest frequencies that can be transmitted or received by a component or medium within specified tolerances. A frequency response is said to be flat within a defined range if there is no perceptible amplitude deviation at any frequency within that range....
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This note was uploaded on 02/16/2009 for the course COMM 202 taught by Professor Thomas during the Fall '06 term at USC.
- Fall '06