The reduction of aircraft engine fan-compressor noise using acoustic linings

9732775 Analysis of the acoustic radiati

9732775 Analysis of the acoustic radiation characteristics of engine compartment and application for reduction of vehicle exterior noise : Yasuhiko Nishimura, Mikio Noba (Toyota Motor Corporation)

📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 141 KB

This paper concerns a low-pass filtering method for evaluating the visibility of shapes. With this method, observers discriminate the shapes of images that are filtered in gradually lower spatial frequencies. Legibility is evaluated by measuring the discrimination threshold cut-off frequencies. The