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信号与系统SignalsandSystems吉林大学
Time-DomainAnalysisofDiscrete-TimeSystems
Discrete-TimeSignals
Discrete-TimeSignalsAdiscrete-timesignalf(k)hasvaluesforsomediscontinuouspointwhilehasnotdefinitionforotherpoints.k—integerDefinition
Discrete-TimeSignalsAnalyticalmethod:Graphicalmethod:Sequencemethod:k=0Representation
Discrete-TimeSignalEnergyandPowerEnergy:Power:
OperationofDiscrete-TimeSignalsAddition:Multiplication:Difference:forwarddifference:backwarddifferenceRunningsum:
OperationofDiscrete-TimeSignalsTimeshift(m0)RightshiftLeftshiftTransformationsoftheIndependentVariable
OperationofDiscrete-TimeSignalsTimereversalTransformationsoftheIndependentVariablef(-k)isobtainedfromthesignalf(k)byareflectionaboutk=0.
BasicDiscrete-TimeSignalsUnitImpulseSequence(UnitSampleSequence)
BasicDiscrete-TimeSignalsUnitStepSequence
BasicDiscrete-TimeSignalsRelationshipbetweend(k)ande(k)
BasicDiscrete-TimeSignalsRectangularSequence
BasicDiscrete-TimeSignalsUnilateralexponentialsequenceswithrealvalues:f(k)=ak?(k)(aisarealnumber)
BasicDiscrete-TimeSignalsUnitrampsequenceSinusoidalSequencesComplexExponentialSequences:Canda:complexnumbers
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