Analog and Digital Comparison Paper
Analog and Digital Signals
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NTC/362
March 2, 2015
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Analog and Digital Signals
Analog and digital conversions in telecommunications are a fascinating topic for discussion. This paper will cover examples of special devices that have the ability to convert analog and digital signals. In analog technology, there are also advantages and disadvantages of amplitude modulation, frequency modulation, phase modulation, and quadrature amplitude modulation (QAM). This paper will give a brief description of those advantages and disadvantages, and also offer the specific modulation techniques that are used in a 56K modem, Asymmetrical Digital Subscriber Line, and Wi-Fi. The T(X) and the synchronous optical network (SONET) digital hierarchy will be further explained as well.
Converting Between Digital and Analog
“Digital-to-analog conversion is a process in which signals having a few (usually two) defined levels or states (digital) are converted into signals having a theoretically infinite number of states (analog)”, as explained by Rouse (2005). A modem will control outgoing digital signals from a computer, and process those signals into audio-frequency tones which is then transmitted over a twisted pair (copper wire) telephone line. An analog-to-digital conversion is the opposite process of a digital-to-analog conversion. That same modem can receive incoming audio-frequency tones that were transmitted from the twisted pair telephone line, and convert those tones into the defined levels of digital signals. If an analog-to-digital converter is positioned after a digital-to-analog converter, within a communications circuit, the digital signal output will be identical to the digital signal input (Rouse, 2005).
An analog signal may also be improved by using an analog-to-digital conversion method. The analog input is made clear when transmitted into a digital signal, which can then be transmitted back into an analog signal. The binary digital signal
*************
NTC/362
March 2, 2015
***********
Analog and Digital Signals
Analog and digital conversions in telecommunications are a fascinating topic for discussion. This paper will cover examples of special devices that have the ability to convert analog and digital signals. In analog technology, there are also advantages and disadvantages of amplitude modulation, frequency modulation, phase modulation, and quadrature amplitude modulation (QAM). This paper will give a brief description of those advantages and disadvantages, and also offer the specific modulation techniques that are used in a 56K modem, Asymmetrical Digital Subscriber Line, and Wi-Fi. The T(X) and the synchronous optical network (SONET) digital hierarchy will be further explained as well.
Converting Between Digital and Analog
“Digital-to-analog conversion is a process in which signals having a few (usually two) defined levels or states (digital) are converted into signals having a theoretically infinite number of states (analog)”, as explained by Rouse (2005). A modem will control outgoing digital signals from a computer, and process those signals into audio-frequency tones which is then transmitted over a twisted pair (copper wire) telephone line. An analog-to-digital conversion is the opposite process of a digital-to-analog conversion. That same modem can receive incoming audio-frequency tones that were transmitted from the twisted pair telephone line, and convert those tones into the defined levels of digital signals. If an analog-to-digital converter is positioned after a digital-to-analog converter, within a communications circuit, the digital signal output will be identical to the digital signal input (Rouse, 2005).
An analog signal may also be improved by using an analog-to-digital conversion method. The analog input is made clear when transmitted into a digital signal, which can then be transmitted back into an analog signal. The binary digital signal