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14 Cards in this Set
- Front
- Back
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Analog data-to-analog signal, which involves amplitude and frequency modulation techniques Digital data-to-square-wave digital signal, which involves encoding techniques. Digital data-to-(a discrete) analog signal, which involves modulation techniques Analog data-to-digital signal, which involves digitization techniques |
four possible data-to-signal conversion combinations: |
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converting analog data to digital signals |
digitization |
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binary 1s and 0s are converted to varying types of on and off voltage levels. The signal looks like a series of straight-line voltage changes. |
square-wave |
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Entities that convey meaning within a computer or computer system |
data |
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Common examples of A computer file of names and addresses stored on a hard disk drive The bits or individual elements of a movie stored on a DVD The binary 1s and 0s of music stored on a CD or inside an iPod The dots (pixels) of a photograph that has been digitized by a digital camera and stored on a memory stick The digits 0 through 9, which might represent some kind of sales figures for a business |
common examples of data |
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the electric or electromagnetic impulses used to encode and transmit data |
signals |
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Common examples of A transmission of a telephone conversation over a telephone line A live television news interview from Europe transmitted over a satellite system A transmission of a term paper over the printer cable between a computer and a printer The downloading of a Web page as it is transferred over the cable between your Internet service provider and your home computer |
Common examples of signals of signals |
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represented as continuous waveforms that can be at an infinite number of points between some given minimum and maximum. |
analog data and analog signals |
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Unwanted electrical or electromagnetic energy that degrades the quality of signals and data. |
noise |
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composed of a discrete or fixed number of values, rather than a continuous or infinite number of values. |
digital data and digital signals |
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The height of the wave above (or below) a given reference point. Can be expressed as volts, amps, or watts. |
the amplitude of a signal. |
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the number of times a signal makes a complete cycle within a given time frame. |
frequency of a signal |
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the length, or time interval, of one cycle |
period |
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the range of frequencies that a signal spans from minimum to maximum is called |
spectrum |
