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Chapter 3 - Chapter 3 Audio and Video Technology Basic...

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Chapter 3 Audio and Video Technology Basic Principle of Media Technology Facsimile Technology - All modes of mass communication based on this process of copying 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 Transduction Transduction - the process of changing one form of energy into another form Both 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. Television and radio signals begin as physical energy Commonly referred to as light waves or sound waves 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 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 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 Digital Transmission Today, both digital radio and television signals have been approved
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for broadcasting Digital transmission - sending binary data to receivers capable of converting this data back into an audio or video signal Digital television (DTV) is growing in popularity in the U.S. Two different digital radio systems. One system uses satellites, the other involves sending a terrestrial signal by your local broadcaster Steps in Signal Processing Step One - Signal Generation Step 2 - Signal Amplification and Processing Step 3 - Signal Transmission Step 4: Signal Reception Step 5: Storage and Retrieval Similarities Between Electromagnetic And Sound Waves Each can be represented graphically as a sine wave which illustrates the wave characteristics of: amplitude frequency length phase Wave Characteristics Similarities Between Electromagnetic And Sound Waves (Cont.) As frequency increases, wavelength decreases (frequency/wave length relationship). Both types of waves attenuate as the travel away from their source.
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