Signals and systems/System properties

  • Systems with memory/without memory
  • Casual systems
  • Stable systems
  • Time invariance in systems
  • Linearity in systems

Memory in systems

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When no need to maintain previous values for getting new results - this is memoryless system

Casuality of systems

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Output depends only from past and current inputs, but no need to know future values.

Stable system

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For each bounded inputs - bounded outputs. When finite inputs then finite outputs.

Time invariance

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  and  
Expected results when time is changing by delta.

Linearity systems

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When   then  
Expected results for all reasonable inputs.