信号与系统教学课件：1-1 Signal measuring and expression

1、Chapter 1 Signals in time domain,Signals and Systems,1.1 Signal measuring and expression 1.2 Operations for signal values 1.3 Transformation of variables 1.4 Sinusoidal and Exponential signal 1.5 Impulse signal and step signal,1.1 Signal measuring and expression,Signal : Measured value at measuring

2、time,Wave-form,Equation-form,Function of time,Continuous-time signals t: real, continuous,Discrete-time signals n : integer, discrete,Measuring time,1.1 Signal measuring and expression,Short sequence signal,1.1 Signal measuring and expression,Real signals: The function value is real; Sketched in one

3、 plot,Complex signals: The function value is complex; Should be sketched in two plots,Measured values,1.1 Signal measuring and expression,1.1 Signal measuring and expression,Operations for signal values Addition Multiplication Differentiation / Integration Summing / Difference,1.2 Operations for Sig

4、nal values,Addition,1.2 Operations for Signal values,Multiplication,1.2 Operations for Signal values,Multiplication with constant,Amplifier,Attenuator,Invertor,1.2 Operations for Signal values,Multiplication with time window : Signal truncating,1.2 Operations for Signal values,Operation for short sequence,1.2 Operations for Signal values,Differentiation and integration,1.2 Operations for Signal values,Difference and summing,1.2 Operations for Signal values,Forward difference,Backward difference,Accumulation,Energy and power of signals,1.2 Operations for