An official website of the United States government. Here's how you know
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.

Federal Bureau of Investigation Federal Bureau of Investigation

Figure 1b

Figure 1b

Figure 1b: Waveform display of a 1.00 kHz sine wave over 5.0 milliseconds, which has
been clipped to +6 decibels.

Figure 1b: Waveform display of a 1.00 kHz sine wave over 5.0 milliseconds, which has been clipped to +6 decibels