Acoustical Intelligence

Acoustical Intelligence (ACOUSTINT, sometimes ACINT) is an intelligence gathering discipline that collects and processes acoustic phenomena. It is a subdiscipline of MASINT (Measurement and Signature Intelligence).

This uses broadband and narrowband analysis of acquired acoustic signatures from surface ships and submarines, although it can also be used for low-flying aircraft such as helicopters. Broadband analysis concerns the overall noise created by a platform, whereas narrowband analysis examines the spectra of the received energy at a more precise level.