Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The upper panel shows the characteristics of the five filters used to generate output spectra. The lower panel shows 25 frequency responses created by combining five levels of low-frequency cut (in steps of 5 dB) with five levels of high-frequency boost (in steps of 2 dB/octave).
