“How can we control object characteristics of a control system?”
When we have control systems, we often have object characteristics that we desire but are not implemented. For example, we might want to have the phase shift of an output signal to achieve peak frequency at a certain value. Well, after many years of hard work, engineers have invented compensators to accomplish this task. Compensators can be commonly found in PID control systems and electrical power systems.
Minimum Phase Systems
“What do we call systems that have all poles and zeros inside the unit circle?”
Systems that have all poles and zeros inside the unit circle are very special. Why? Well, because with these systems, their causal system will be completely stable and will have a phase lag less than a system of identical magnitude. Since these systems are so special, controls and signal engineers have termed them Minimum Phase Systems.
Bandwidth (signal processing)
“How can we classify a set of frequencies?”
In signal processing, we will often receive signals of varying frequencies. So how can we organize all of these frequencies? Well, why don’t we just take the difference between the upper and lower limit of these frequencies? This is known as bandwidth, is measured in Hertz and is used everywhere in signal processing.