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### Course: Middle school physics>Unit 4

Lesson 6: Digital signals

Analog and digital signals differ in how they represent information. Analog signals, like the hands of a clock or sound waves, can show any value within a range. Digital signals, like a digital clock or digitized sound, only show specific, separate levels. Sound waves can be digitized for more reliable storage and processing. Created by Khan Academy.

## Want to join the conversation?

• Is this why when you hear a recording of someone's voice, etc. it doesn't sound quite the same as if it were to be in real life?
• Yes! Especially if the recording is on a low quality (or old) recording device, which are not as capable of capturing the waves as precisely.
Although, if you have a really good platform, it can become hard to differentiate the two.
• how is the information lost in translation?
• Compare the set of real numbers with let's say the set of integers. If we are talking about numbers one and two in these sets we are still talking about 1 and 2 but in R there are infinite numbers between 1 and 2 which are lost in Z... so some information is lost in translation.
• Can you turn digital wave into an analog wave, or is it a one-way process?
• Digital to analog conversions can be performed using resistor networks, and the conversion to an analog signal is usually in the order of nanoseconds. Since the digital information is a step approximation of the input signal, the resulting output from a D to A converter reflects this step nature of the signal. So no, it isn't a one-way process.

I hope that helps!
• How can I tell the difference between an anologe and digital
• Analog information expresses information in a continuous way, like an arrow pointing to a point on a line. Think of it as decimals. On the other hand, digital information is expressed only using a few points on that line. You can also think of it as using only whole numbers.
(1 vote)
• How can I tell the difference between an anologe and digital
• An analog clock is a clock with the hands that turn around in a circle. A digital clock is a clock that just tells you the time by stating the numbers.
• The Analog can tell the time and the Digital can tell the time too?
• Yes.
• Does an Analog clock really have infinite values? It only goes from 12 AM - 12 PM
• Yes, it does. The hours and minute hands can position themselves in an infinite amount of fractional locations (e.g. .001, .002, .003, etc).
• why was the first one so lazy and the second one was so kind of lazy but not to much but why is the third one is like a rectangles.