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17 Cards in this Set
- Front
- Back
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Electronics Communication by Frenzel 4th Edition |
Chapter 1 |
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What is Communication? |
Communication is the process of exchanging information |
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Two of the main barriers to human communication |
Two of the main barriers to human communication are language and distance. |
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All electronic communication systems have |
All electronic communication systems have a transmitter, a communication channel or medium, and a receiver |
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In electronic communication systems, the message is referred to as |
In electronic communication systems, the message is referred to as information, or an intelligence signal |
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Noise is |
Noise is the general term applied to any phenomenon that degrades or interferes with the transmitted information. |
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A general model of all communication sytem |
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The first step in sending a message |
The first step in sending a message is to convert it into electronic form suitable for transmission. |
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For voice messages, |
For voice messages, a microphone is used to translate the sound into an electronic audio signal. |
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For TV, |
For TV, a camera converts the light information in the scene to a video signal. |
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In computer systems, |
In computer systems, the message is typed on a keyboard and converted to binary codes that can be stored in memory or transmitted serially |
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Transducers convert |
Transducers convert physical characteristics (temperature, pressure, light intensity, and so on) into electrical signals. |
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The transmitter itself is a |
The transmitter itself is a collection of electronic components and circuits designed to convert the electrical signal to a signal suitable for transmission over a given communication medium. |
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Transmitters are made up of |
Transmitters are made up of oscillators, amplifiers, tuned circuits and filters, modulators, frequency mixers, frequency synthesizers, and other circuits. |
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The communication channel is |
The communication channel is the medium by which the electronic signal is sent from one place to another |
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A receiver is |
A receiver is a collection of electronic components and circuits that accepts the transmitted message from the channel and converts it back to a form understandable by humans. |
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Receivers contain |
Receivers contain amplifiers, oscillators, mixers, tuned circuits and i lters, and a demodulator or detector that recovers the original intelligence signal from the modulated carrier. |
