Continuous-time and Discrete-time signal continuous-time Signal:time and signal are continuous Continuous-time signal:sin(0.1Tt) 0.5 0 -0.5 sin(0.lπt) -10 8 6 -4 2 0 2 4 6 10 infinite-precision of signal value and time Discrete-time signal:time is discrete,signal value is continuous Discrete-time signal:sin(0.1Tr n) 1 0.75 0.5 0.25 0 -0.25 -0.5 sin(0.lπn) -0.75 八7 -10 8 6 -2 0 2 4 6 8 10 infinite-precision of signal value,finite-precision of signal value 2022/10/1 8 8
2022/10/1 8 8 Continuous-time and Discrete-time signal sin(0.1 ) t sin(0.1 ) n continuous-time Signal: time and signal are continuous infinite-precision of signal value and time infinite-precision of signal value, finite-precision of signal value Discrete-time signal: time is discrete, signal value is continuous
Discrete-time signal and Digital Signal digital signal:signal values are quantized,in binary representation, time is discrete discrete-time signal:time is discrete,signal value is continuous Discrete-time signal:sin(0.1TT n) 0.75 0.5 infinite-precision signal values 0.25 兰02 0.5 sin(0.lπm) -0.75 7 0 8 8 2 0 6 8 10 n digital signal Digtal signal:0.25*round(4sin(0.1TT n)) 0.75 0.5 finite-precision signal values 0.25 0 -0.25 -0.5 0.25round(4sin(0.1an)) -0.75 -1 -10 -8 -6 -2 0 2 6 8 10 signal values are only one of(-1,-0.75,-0.5,-0.25,0,0.25,0.5, 0.75,1),when signal value is presented by 3-bit binary numbe22/10/1 9 8
2022/10/1 9 8 Discrete-time signal and Digital Signal digital signal: signal values are quantized, in binary representation, time is discrete sin(0.1 ) n 0.25 (4sin(0.1 )) round n infinite-precision signal values finite-precision signal values discrete-time signal: time is discrete, signal value is continuous digital signal signal values are only one of (-1, -0.75, -0.5, -0.25, 0, 0.25, 0.5, 0.75,1), when signal value is presented by 3-bit binary number
Objects of Signal Processing Process one signal to obtain another signal; Signal interpretation:Characterization of the input signal. Example:speech recognition phonemic speech digital preprocessing pattern transcription signal (filtering,parameter recognition estimation,etc) final signal expert interpretation system 10 2022/10/18 Zhongguo Liu_Biomedical Engineering_Shandong Univ
10 2022/10/18 Zhongguo Liu_Biomedical Engineering_Shandong Univ. 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