The amplitude distribution of frequencies in a signal.
FHWA InfoTechnology
You are now leaving the United States Department of Transportation (DOT) website and entering an external link or a third-party website.
The Federal Highway Administration (FHWA) DOT website provides links to other websites to provide additional information that may be useful or interesting, and is being provided in a manner consistent with the intended purpose of the content you are viewing on the website. Federal Highway Administration (FHWA) DOT is providing these links for your reference. Once you access another website through a link that we provide, you are subject to the copyright and licensing restrictions of the new website.
It is the sole responsibility of you, the user of this website, to carefully examine the content of the website and all linked pages for privacy, copyright and licensing restrictions and to secure all necessary permissions if applicable.
