Application of a sound insulation panel with ventilation holes to the engine under-cover

9732784 Application of a sound insulatio

9732784 Application of a sound insulation panel with ventilation holes to the engine under-cover : Keijiro Iwao, Yuji Shimpo (Nissan Motor Co., Ltd.), Haruki Yashiro (Nissan Diesel Motor Co., Ltd.)

📂 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