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.
Dotted, grey line: Power spectrum of unprocessed speech. Solid, black line: spectrum after nonlinear frequency compression. Above a cutoff frequency Fc, the spectrum is compressed by a ratio CR = Δf orig/Δf comp.
