How to envelope a non periodic Impulse signal?

1. How do you find the envelope of a signal?
2. What is an envelope of a signal?
3. How to make an envelope in Matlab?

How do you find the envelope of a signal?

In the EMD algorithm, the upper and lower envelopes of signals are obtained by using two steps: 1) identify all the local extrema; 2) interpolate between extrema by a cubic spline [9]. The interpolative envelope includes the upper and lower envelopes.

What is an envelope of a signal?

In physics and engineering, the envelope of an oscillating signal is a smooth curve outlining its extremes. The envelope thus generalizes the concept of a constant amplitude into an instantaneous amplitude. The figure illustrates a modulated sine wave varying between an upper envelope and a lower envelope.

How to make an envelope in Matlab?

Use a Hilbert filter with a length of 100. Plot the channels and the envelopes. Use solid lines for the upper envelopes and dashed lines for the lower envelopes. Call envelope without output arguments to produce a plot of the signal and its envelopes as a function of sample number.