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 (1)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 SIgma
§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 (a/D) converter The reverse operation of converting a digital signal into a continuous time signal is performed by a digital-to-analog dla)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