Burst Rise/Fall vs. Spectral Width

Objective: To see the effects of the Rise (and Fall) time on the width of the Tone Burst spectrum.

Set Burst Lag to zero and High to about 128 samples. Set Tone Freq to 2000 Hz. Set Rise and Fall to 128 samples each, and Burst Cycle to 512 samples.

You should see a single tone burst which takes up the first 384 samples of the waveform trace. Flip to the power spectrum display via the Spectrum button (ALT+S) followed by the Y-log button (ALT+Y). Note the width of the spectrum spread on either side of 2000 Hz as you cut Rise and Fall in half to 64 samples each. Keep cutting these in half and watch the spectrum widen further. Check out the effects of different Shapes.

See Fundamental Time - Frequency Domain Concepts for further discussion of this phenomenon.

See also Burst Overview, Basic Burst Operation, Burst Dialog, Waveform Stream Controls.