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Features of Analogue in Control Systems

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Alun King

on 10 October 2014

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Transcript of Features of Analogue in Control Systems

Features of Analogue in Control Systems
Noise Filtering
Analogue inputs can often have "background noise" when taking readings.
A bit like a microphone picks up unwanted sounds when recording

Noise Filtering is the process where these unwanted signals are removed from the digital signal
Level Shifting
The operating voltage of an analogue device may be different from the operating voltage of the ADC.

Level shifting is the process by which the voltage of the analogue device is matched to the optimum level for the ADC
Signal Conditioning
ADC devices are conditioned to work within a specific range, so they have a limited sensitivity
If a small analogue signal is input (mV instead of V) then it would require amplification to allow the ADC to perform PCM in an easier manner
Digital to Analogue
For output to analogue devices (e.g. playing sound from a computer), a digital to analogue converter (DAC) is used.
This essentially reverses the PCM process.

Discrete digital steps are taken and transformed into an analogue system
Analogue to Digital Conversion (ADC)
When an analogue input is needed for a digital control system (e.g. sound, light levels) it need to be converted to a digital signal

An ADC device is used to do this.

ADC devices use Pulse Code Modulation to convert the signal.
Pulse Code Modulation
PCM reads discrete values from a continuous signal
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