SAC Command Reference Manual

HANNING

SUMMARY

Applies a "hanning" window to each data file.

SYNTAX

HANNING

DESCRIPTION

The "hanning" window is a recursive smoothing algorithm defined at each interior data point, j, as:

Y(j) = 0.25*Y(j-1) + 0.50*Y(j) + 0.25*Y(j+1)

Each end point is set equal to its closest interior point.

ERROR MESSAGES

  • 1301: No data files read in.
  • 1306: Illegal operation on unevenly spaced file

HEADER CHANGES

DEPMIN, DEPMAX, DEPMEN

REFERENCES

Blackman and Tukey, "The Measurement of Power Spectra", Dover Publications, New York, 1958.

LATEST REVISION

January 8, 1983 (Version 8.0)