Analog-to-Digital Conversion › lesson 02 of 100 · Beginner
Define Digital Signals
This lesson is the second in the course on Analog-to-Digital Conversion and will teach you about digital signals. After this lesson, you will be able to recall discrete signal levels representing information.
Digital signals represent information using discrete signal levels.
In a digital telephone, your voice is converted into a series of discrete voltage levels, which are then transmitted over the network. This is an example of a digital signal, where the information is represented by discrete levels. The rule is that digital signals use discrete signal levels to represent information.
These discrete levels can be thought of as a series of binary digits (0s and 1s) that are used to represent the information. The number of discrete levels used can vary depending on the application, but the principle remains the same.
The use of discrete signal levels allows for error detection and correction, as any signal that is not at one of the discrete levels can be detected as an error.
Exemples
- A digital image is represented by discrete levels of pixel intensity.Each pixel can have one of a limited number of intensity values.
- A digital audio signal is represented by discrete levels of amplitude.Each sample can have one of a limited number of amplitude values.
- A digital thermometer is represented by discrete levels of temperature.Each temperature reading can have one of a limited number of values.
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