4.0Introduction Discrete-Time Processing of Continuous-Time signals >Continuous-time signal processing can be implemented through a process of sampling, discrete-time processing,and the subsequent reconstruction of a continuous-time signal. C/D Discrete-time D/C x(n] system y[n] T 下：sampling period xn,1/:sampling frequency (rate)in Hz -oK<n<oo 2,=2π/T,(rad/s) sampling frequency(rate)in radians/s 3and the subsequent reconstruction of a continuous-time signal. 3 4.0 Introduction ➢Continuous-time signal processing can be implemented through a process of sampling,   ( ), f=1/T: sampling frequency (rate) in Hz x n x nT c n = −   =s 2 , /  T rad s ( ) T: sampling period discrete-time processing, Discrete-Time Processing of Continuous-Time signals sampling frequency(rate) in radians/s