SUMMARY
Computes the envelope function using a Hilbert transform.
SYNTAX
ENVELOPE
DESCRIPTION
This command computes the envelope function of the data in memory. The envelope is defined by the square root of x(n)^2 + y(n)^2, where x(n) is the original signal and y(n) its Hilbert transform (see HILBERT). As with HILBERT, very long period datashould be decimated (see DECIMATE) prior to processing.
HEADER CHANGES
DEPMIN, DEPMAX, DEPMEN
ACKNOWLEDGEMENT
The subroutines used to perform the Hilbert transform were designed and developed by Dave Harris (DBH).
LATEST REVISION
April 21, 1989 (Version 10.4c)