Digital vs Analog

Analog encoding sends or stores information using quantities that

• can vary continuously.

• can only have specific values.

• are separated by consistent numbers.

• store waves’ crest and trough sizes in small steps.

Digital encoding sends or stores information using quantities that

• can vary continuously.

• can only have specific values.

• have no numeric gaps between one another.

• create smooth curves inside a sound wave.

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Which of the following is NOT an analog device?

• a light knob that can adjust brightness between fully on and off

• a mouse connected to your computer controlling your cursor

• an FM radio tower broadcasting music

• a runner’s watch that can time to thousandth-second intervals

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A signal is

• a radio wave with an unchanging amplitude and frequency.

• a radio wave with an unlimited range.

• a wave that can only be generated in analog.

• anything that carries information and can be detected.

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Radio "noise" is

• unwanted, random signals interfering with the intended signal.

• a natural result of waves decreasing in energy and amplitude over long distances.

• caused by radio receivers being unable to interpret waves with low amplitudes.

• intentionally added to radio waves.

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Why is the weak analog signal harder to hear?

• The weak signal’s sound and clarity decrease corresponding to its amplitude.

• Radios have trouble distinguishing between weak signals and random noise.

• Increased distance causes wavelengths and frequencies to change.

• Radios have trouble connecting with lower-energy waves.

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Why are digital signals less likely to be affected by noise than analog signals?

• There are more sources of analog noise than digital noise.

• Digital waves have higher amplitudes, and thus overpower noise

• Non-binary noise can be easily filtered out by digital systems.

• Analog radios add noise to the signals they receive to improve sound quality.

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Binary code

• is made up of only two values, such as 1s and 0s.

• can be separately interpreted as text, sounds or images.

• signals when electrical switches in digital devices should activate.

• all of the above

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How can different types of programs all use the same binary code to function?

• One string of binary codes can simultaneously act as text, sound and image.

• Text binary uses 1s and 0s, while other programs use a different pair of numbers.

• Each program interprets the binary code differently, so the 1s and 0s can represent text, sound, or images.

• Music and images use longer strings of binary code than plain text.

Is a video game coded as analog or digital data?

• Analog
• Digital

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