Analogue Or Digital Flashcards
(19 cards)
What is an analogue signal?
A signal that mimics the variation in size and quality of the physical quantity it represents
What is a digital signal?
A signal that encodes information as a series of numbers
What is the sampling rate?
The number of times per second that the quantity is measured
What is sampling sensitivity?
The smallest increment in the quantity that is measured and recorded
What does a moving coil analogue meter display?
The needle moves in proportion to the current flow caused by voltage
How does a digital voltmeter function?
It samples the voltage at regular intervals and displays the result as a number
What is an analogue to digital converter (ADC)?
A device that converts analogue signals into digital signals
What is the first step in setting up an ADC?
Connect a sensor (transducer) to give an analogue signal into the ADC input
What is the second step in setting up an ADC?
Select sampling rate and sensitivity
What are images made up of?
Coloured dots, grains, pixels, etc.
What is the output of digitised video?
Each pixel is converted into a set of numbers representing its colour and brightness
Why is most data being switched to digital transmission?
To improve quality and efficiency in radio, TV, and internet traffic
What is one advantage of digital transmission?
More data fitted in the same bandwidth
What is another advantage of digital transmission?
Most interference can be eliminated, giving higher quality
What is a drawback of digital transmission?
Time delay due to signal processing
How is data accuracy limited in digital systems?
By sampling settings
Fill in the blank: A _______ makes a useful small temperature sensor.
thermistor
What does a thermistor produce when connected in a suitable electronic circuit?
A voltage signal that varies directly with temperature
What can be displayed using the voltage signal from a thermistor?
Temperature data on a meter
