Signal Processing Toolbox

Common Aperiodic Waveforms

The toolbox also provides functions for generating several widely used aperiodic waveforms:

• gauspuls generates a Gaussian-modulated sinusoidal pulse with a specified time, center frequency, and fractional bandwidth. Optional parameters return in-phase and quadrature pulses, the RF signal envelope, and the cutoff time for the trailing pulse envelope.
• chirp generates a linear swept-frequency cosine signal. An optional parameter specifies alternative sweep methods. An optional parameter phi allows initial phase to be specified in degrees.

To compute 2 seconds of a linear chirp signal with a sample rate of 1 kHz, that starts at DC and crosses 150 Hz at 1 second, use

• t = 0:1/1000:2;
  y = chirp(t,0,1,150);
  

To plot the spectrogram, use

• specgram(y,256,1000,256,250)
  
  
  

Common Periodic Waveforms

The pulstran Function