Audio & Video Technology-3

Audio& Video - Audio& Video Technology Quick Facts Bandwidth of an FM channel 200 kilohertz Bandwidth of a digital television channel 6

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Unformatted text preview: Audio & Video Technology Quick Facts Bandwidth of an FM channel: 200 kilohertz Bandwidth of a digital television channel: 6 megahertz First high-definition TV broadcasts: 1998 Cost of 51” digital HDTV set (1999): $5,000 Cost of 51” digital HDTV set (2006): $1,699 Technology, Why is it Important? Establishes Parameters for Electronic Media Operations Directly Affects Economics of Electronic Media Justification for Regulation of Electronic Media Basic Principle of Media Technology Facsimile Technology - All modes of mass communication based on this process of copying Basic Principle of Media Technology Fidelity - a way to describe how faithfully a facsimile represents the original High Fidelity is reproduction that closely approximates the original signal Radio waves can be used to transmit facsimiles of pictures and sounds Signal and Noise Signal - the amount of program Noise - the amount of interference Signal to noise ratio - the amount of signal present compared to the amount of noise Signal and Noise Analog signals are subject to varying amounts of noise The farther away from the transmitter, the more noise is present Digital signals are subject to less noise interference than analog signals Transduction Transduction - the process of changing one form of energy into another form Analog and digital broadcasting involves different kinds of transductions Analog transmission loses fidelity at each phase of the process Digital technology reduces loss of fidelity in the transduction process. Examples of Transduction Capturing sound of a bird chirping using a microphone involves the transduction of sound waves into electricity Transmitting the sound of the chirping involves transducing the electrical energy into electromagnetic energy At home, our antenna detects the transmitted signal and begins to reverse the transduction process Transduction Television and radio signals begin as physical energy Commonly referred to as light waves or sound waves Electromagnetic Energy Electromagnetic Energy The Electromagnetic Spectrum Electromagnetic Energy Fundamental Characteristics Radiant--Moves through surrounding Space Constant Velocity: 186,000 miles per second Wavelike Motion Waves: Oscillation and the Waveform Oscillation - a basic concept of audio and video signal processing Examples - vibration of air produced by our mouths makes sound and vibration of light make up all the images we see Electromagnetic waves are subject to oscillation Wave Characteristics: Amplitude Wave Characteristics: Frequency Oscillation and the Waveform The oscillations of a radio wave defines its frequency Frequency and Amplitude...
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This note was uploaded on 02/15/2011 for the course RTV 3007 taught by Professor Staff during the Fall '08 term at University of Florida.

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Audio& Video - Audio& Video Technology Quick Facts Bandwidth of an FM channel 200 kilohertz Bandwidth of a digital television channel 6

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