However there are also sawtooth waves in which the wave ramps downward and then

# However there are also sawtooth waves in which the

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However, there are also sawtooth waves in which the wave ramps downward and then sharply rises. The latter type of sawtooth wave is called a 'reverse sawtooth wave' or 'inverse sawtooth wave'. Now consider generating a square wave of amplitude A, fundamental frequency fo and phase shift w (in radians). To generate such a signal we use the command: A*square(fo*t + W); To generate a discrete time signal, we may use the stem command. Specifically, stem(n,x) depicts the data contained in vector x as a discrete time signal at the time values defined by n. The vectors n and x must, of course, have compatible dimensions. 1 Aperiodic Signals Exponential Signals There are two types of exponential signals: decaying exponentials and growing exponentials. The MATLAB command for decaying exponential Be -at is B*exp(-a*t); To generate a growing exponential Be at , we use command: B*exp(a*t); In both cases, the exponential parameter a is positive. Other Functions A discrete time unit step function may be created as follows: n = -1:1:20; x = n>=0; stem(n,x) axis([-1 25 0 2]) Programs Program 1: Following is the list of commands that generates a sawtooth wave with amplitude of 1 unit, a frequency of 2 Hz or (4 p  #### You've reached the end of your free preview.

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• Spring '15
• M. Mazidi,Danny Causey
• Fourier Series, Square wave, Rectangular function, Triangle wave, sawtooth wave
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