Frequency Analysis

Frequency analysis is the use of hardware or software to decompose an audio signal into its various frequency components. For our project, we have applied frequency analysis in several ways to help improve the audio quality and intelligibility of our system.

Mohammad Raza, leader of the tools and media team, developed software for MATLAB that helps us to analyze the various frequencies contained in any audio file. We used this software in conjuction with audio files to help identify possible problems our system would have to overcome. For example, we used audio clips of a diesel engine and urban noise to see if there were any frequencies we might be able to filter out of the transmission, making the audio more intelligible to the receiver of the audio signal.

Frequency analysis was also used implicitly in our efforts to generate the Speach Intelligibility Index, or STI, of our system under various conditions. You can read more information about STI on the Speech Intelligibility page.