Chapter 5 Digital Processing of Continuous-Time Signals
Chapter 5 Digital Processing of Continuous-Time Signals
85.1 Digital Processing of Continuous-Time Signals Digital processing of a continuous-time signal involves the following basic steps Conversion of the continuous-time signal into a discrete-time signal (2)Processing of the discrete-time signal, 3)Conversion of the processed discrete- time signal back into a continuous-time signal
§5.1 Digital Processing of Continuous-Time Signals • Digital processing of a continuous-time signal involves the following basic steps: (1) Conversion of the continuous-time signal into a discrete-time signal, (2) Processing of the discrete-time signal, (3) Conversion of the processed discretetime signal back into a continuous-time signal
85.1 Digital Processing of Continuous-Time Signals Conversion of a continuous-time signal into digital form is carried out by an analog-to- digital (anD) converter The reverse operation of converti a digital signal into a continuous- time signal is performed by a digital-to-analog(d/a)converter
§5.1 Digital Processing of Continuous-Time Signals • Conversion of a continuous-time signal into digital form is carried out by an analog-to-digital (A/D) converter • The reverse operation of converting a digital signal into a continuoustime signal is performed by a digital-to-analog (D/A) converter
85.1 Digital Processing of Continuous-Time Signals Since the ad conversion takes a finite amount of time, a sample-and-hold(s/h) circuit is used to ensure that the analog signal at the input of the a/d converter remains constant in amplitude until the conversion is complete to minimize the error in its representation
§5.1 Digital Processing of Continuous-Time Signals • Since the A/D conversion takes a finite amount of time, a sample-and-hold (S/H) circuit is used to ensure that the analog signal at the input of the A/D converter remains constant in amplitude until the conversion is complete to minimize the error in its representation
85.1 Digital Processing of Continuous-Time Signals To prevent aliasing, an analog anti aliasing filter is employed before the S/h circuit To smooth the output signal of the D/A converter, which has a staircase-like waveform, an analog reconstruction filter is used
§5.1 Digital Processing of Continuous-Time Signals • To prevent aliasing, an analog antialiasing filter is employed before the S/H circuit • To smooth the output signal of the D/A converter, which has a staircase-like waveform, an analog reconstruction filter is used