MATLAB SIGNAL PROCESSING TOOLBOX 6 Manual do Utilizador descarregar pdf (Página 15)

Common Periodic Waveforms

2-7

Common Periodic Waveforms

The toolbox provides functions for generating widely used periodic waveforms:

• sawtooth generates a sawtooth wave with peaks at ±1 and a period of 2π. An

optional width parameter specifies a fractional multiple of 2π at which the signal's

maximum occurs.

• square generates a square wave with a period of 2π. An optional parameter specifies

duty cycle, the percent of the period for which the signal is positive.

To generate 1.5 s of a 50 Hz sawtooth wave with a sample rate of 10 kHz and plot 0.2 s of

the generated waveform, use

fs = 10000;

t = 0:1/fs:1.5;

x = sawtooth(2*pi*50*t);

plot(t,x)

axis([0 0.2 -1 1])

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MATLAB SIGNAL PROCESSING TOOLBOX 6 Manual do Utilizador Página 15