Abstract
Virtual low-noise space for operators' working space under noisy environment in facility has been studied so far for keeping safety and comfortable working condition. This paper focuses on operators' location sensing methods and a comparison between the methods of machine vision from top and of Spread Spectrum Acoustic Waves are described. From the experimental results in an orange grading facility, it was observed that the method of machine vision showed small enough measurement error but problems of small measurement area and less robustness. The method of Spread Spectrum Acoustic Waves could show that noise tolerance was 13dB and there were possibilities to enlarge measurement area and to increase operator number in the virtual low-noise space.
