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
β¦ LIBER β¦
Noise reduction of muffler by optimal design
β Scribed by Oh, Jae-Eung ;Cha, Kyung-Joon
- Publisher
- Springer-Verlag
- Year
- 2000
- Tongue
- Korean
- Weight
- 879 KB
- Volume
- 14
- Category
- Article
- ISSN
- 1226-4865
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This paper describes a detailed investigation of the noise generated by an ultrasonic chain of reception carried out on a piezoelectric receiver of standard characteristics amplified by a low-noise amplifier (LNA) of optimum design. The objective is to provide the conditions which will allow the bes