Digital vs. Analog Signals

What are some advantages that analog signals have over digital signals?

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Answer explanation

Analog signals have the potential for an infinite amount of signal resolution, and the signals have a higher density than digital signals. Analog signals are also easier to process than digital signals.

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NGSS.MS-PS4-3

What are digital signals, and how are they generated?

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Answer explanation

Digital signals are patterns generated by sampling a stream of continuous data at regular intervals. They are generated when the bits of data are converted to a numeric or digit value.

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What are the advantages of using digital signals for transferring information?

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Answer explanation

Digital signals are able to carry more information than analog signals, which result in a more efficient use of frequencies and allow for a higher definition of images.

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What types of things do you use that use analog and digital sources?

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Answer explanation

Radio, cell phones, wired and wireless computers, televisions

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Why is digital considered to be more reliable than analog?

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Answer explanation

Digital information can be stored and transmitted over long distances without much degradation. Digital also takes much less bandwidth to transfer and to store.

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What is bandwidth?

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Answer explanation

Bandwidth is the amount of data that can be carried from one point to another in a given time period.

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What is one way in which sending information by digital signals is better than sending it by analog signals?

• The range of analog signals is only a few meters.

• Analog signals suffer more interference.

• The equipment for analog signals costs more.

• Analog signals can't transmit sound information.

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Fiber optics is a process that allows people to send information through pulses of light along thin wires made of glass. In order for information to be sent by fiber optic transmission, the information being sent must–

• travel only in a straight line

• first be converted to a digital signal

• be some kind of visual information

• consist of only simple data

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For sound to be recorded digitally, it is sampled and turned into numbers. The numbers are stored and later converted back to sound. Why does sound recorded digitally last longer without degrading than sound recorded through analog technology?

• Numbers can be added together or subtracted.

• The values of the numbers are always constant.

• Only ten digits are needed to record all sounds.

• Digitally recorded sound takes up less space.

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A Wi-Fi router is an electrical device that allows the rapid transfer of digital information between a modem and a computer. In order to do this, radio waves are used. From this we can conclude that radio waves have what properties?

• They store massive amounts of information and generate heat as they move.

• They can be used to power computers and have very short wavelengths.

• They create electrical currents and travel in straight lines over infinite distances.

• They are able to carry digital information and can travel through space at high speeds.

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