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.
Top left: Maximum output curve for a hearing aid with a 90 dB SPL pure-tone input. Other curves show the output from the same hearing aid with a complex noise ijnput at 49, 59, 69, and 89 dB SPL. The hearing aid is saturated at inputs of 59 dB SPL and above. From Stelmachowicz P, Lewis D, Seewald R, and Hawkins D (1990). Complex and pure-tone signals in the evaluation of hearing-aid characteristics. Journal of Speech and Hearing Research, 33, 380–385.
