Digital and Discrete-time SignalProcessingContinuous-time signal processingtime and signal are continuousDiscrete-time signal processing:time is discrete, signal is continuousDigital signal processing:time and signal are discrete
Digital and Discrete-time Signal Processing ◆Continuous-time signal processing: time and signal are continuous ◆Discrete-time signal processing: time is discrete, signal is continuous ◆Digital signal processing: time and signal are discrete
Discrete-time ProcessingDiscrete-time processing of continuous-time signalDiscrete-timeC/DD/Csystemx[n]y[n]XoI y,(t)个TTideal continuous-to-discrete-time (C/D) converterideal discrete-to-continuous-time (D/C) converterReal-time operation is often desirable:output is computed at the same rate atwhich the input is sampled
Discrete-time Processing ◆Discrete-time processing of continuous-time signal ◆Real-time operation is often desirable: output is computed at the same rate at which the input is sampled ideal continuous-to-discrete-time (C/D) converter ideal discrete-to-continuous-time (D/C) converter
Objects of Signal ProcessingProcess one signal to obtain another signal;Signal interpretation: Characterization of theinput signal.Example: speech recognitionphonemicdigital preprocessingtranscriptionspeechpattern(filtering,parametersignalrecognitionestimation,etc)expertfinal signal systeminterpretation
Objects of Signal Processing ◆Process one signal to obtain another signal; ◆Signal interpretation: Characterization of the input signal. digital preprocessing (filtering,parameter estimation,etc) speech signal pattern recognition expert system phonemic transcription final signal interpretation Example: speech recognition
Objects of Signal ProcessingSymbolic manipulation of signalprocessing expression: signal andsystems are represented andmanipulated as abstract data objectswithout explicitly evaluating the datasequence
Objects of Signal Processing ◆Symbolic manipulation of signal processing expression: signal and systems are represented and manipulated as abstract data objects, without explicitly evaluating the data sequence