The unit impulse and step functions in Discrete-time
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1.The Discrete-time Unit Impulse
The the unit impulse is defined as eq. 1 and it is shown in fig. 1 with the duration from -10 to 10 ;
Equation 1 Figure 1 Discrete-time unit impulse
To create a figure like fig.1 in MATLAB ,you may need the code as below
>> n = -10:10; delta = [(n==0)];>> stem(n,delta,'r','filled');>> xlabel('n'); ylabel('delta(n)');>> title('Discrete-time Unit Impulse');
2.The Discrete-time Unit step
The discrete-time unit step is denoted by u[n] , where 'u' is probably the abbreviation of 'unit'. u[n] is defined by the equation 2 and the unit sequence is shown in figure 2 .
Equation 2 Figure 2 : Discrete-time unit step sequence
Again, we can use MATLAB to create the unit step sequence and plot it by the following lines of codes .
>> n = -10:10; unitstep = [(n>=0)];>> stem(n,unitstep,'r','filled');>> xlabel('n');ylabel('u[n]');>> title('Discrete-time Unit Step Sequence');
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