Wk2 - Analog Signals Flashcards
What is a requirement for IoT Devices?
To acquire, process and store data.
Continuous signal
Physical data varies by time and is represented by a continuous, uncountable, infinite number of dependent variable points.
To monitor, process or store physical data, we need to what?
Measure it. Digitize it
What does digitization mean?
Converting a signal to a numerical equivalent
What is the 2-step process of Digitizing a signal?
1 - A sensor converts physical data (temperature, speed, distance, etc) into an equivalent voltage vs time form.
2 - A digitizer is used to sample the voltage signal, converting it to a numerical value.
What does a sensor do?
It converts converts physical data (temperature, speed, distance, etc) into an equivalent voltage vs time form.
What does a digitizer do?
It is used to sample the voltage signal, converting it to a
numerical value.
In other words: digitize a voltage vs time signal
What is continous signal converted to?
Discrete signal
Discrete signal
A countable number of dependent variable points.
Discrete
Finite number of points per unit time.
What does Digitization create?
An approximation of the original continuous signal
What do sensors convert continous signals to?
voltage
What can impact signals?
- Weak signal strength
- Electrical noise, interference
What are digitizers usually called?
Analog-to-Digital (A/D) converter.
What is the output of an A/D converter?
A digital word with a fixed number
of bits
