An efficient calibration algorithm for an ambulatory audiometric test system is proposed. This system utilizes a personal digital assistant (PDA) device to generate the correct sound pressure level (SPL) from an audio...An efficient calibration algorithm for an ambulatory audiometric test system is proposed. This system utilizes a personal digital assistant (PDA) device to generate the correct sound pressure level (SPL) from an audiometric transducer such as an earphone. The calibrated sound intensities for an audio-logical examination can be obtained in terms of the sound pressure levels of pure-tonal sinusoidal signals in eight-banded frequency ranges (250, 500, 1 000, 2 000, 3 000, 4 000, 6 000 and 8 000 Hz), and with mapping of the input sound pressure levels by the weight coefficients that are tuned by the delta learning rule. With this scheme, the sound intensities, which evoke eight-banded sound pressure levels by 5 dB steps from a minimum of 25 dB to a maximum of 80 dB, can be generated without volume displacement. Consequently, these sound intensities can be utilized to accurately determine the hearing threshold of a subject in the ambulatory audiometric testing environment.展开更多
The guiding of 60 keV O6+ions along capillaries in an Al2O3 membrane is studied.The charge state distribution and the angular distribution of the ions transmitted through the capillaries are measured.The ion guiding a...The guiding of 60 keV O6+ions along capillaries in an Al2O3 membrane is studied.The charge state distribution and the angular distribution of the ions transmitted through the capillaries are measured.The ion guiding ability of the concerned capillaries for the used projectile ions is analyzed,and is compared with other results using PC and alumina capillaries.Qualitative agreement is found.Further studies on material influence on the ion guiding power of the capillaries are needed.展开更多
基金supported by the grant of the Korean Ministry of Education, Science and Technology (The Regional Core Research Program/Chungbuk BIT Research-Oriented University Consortium)
文摘An efficient calibration algorithm for an ambulatory audiometric test system is proposed. This system utilizes a personal digital assistant (PDA) device to generate the correct sound pressure level (SPL) from an audiometric transducer such as an earphone. The calibrated sound intensities for an audio-logical examination can be obtained in terms of the sound pressure levels of pure-tonal sinusoidal signals in eight-banded frequency ranges (250, 500, 1 000, 2 000, 3 000, 4 000, 6 000 and 8 000 Hz), and with mapping of the input sound pressure levels by the weight coefficients that are tuned by the delta learning rule. With this scheme, the sound intensities, which evoke eight-banded sound pressure levels by 5 dB steps from a minimum of 25 dB to a maximum of 80 dB, can be generated without volume displacement. Consequently, these sound intensities can be utilized to accurately determine the hearing threshold of a subject in the ambulatory audiometric testing environment.
基金supported by the Doctor Research Foundation of Southwest University of Science and Technology(Grant No.10zx7103)
文摘The guiding of 60 keV O6+ions along capillaries in an Al2O3 membrane is studied.The charge state distribution and the angular distribution of the ions transmitted through the capillaries are measured.The ion guiding ability of the concerned capillaries for the used projectile ions is analyzed,and is compared with other results using PC and alumina capillaries.Qualitative agreement is found.Further studies on material influence on the ion guiding power of the capillaries are needed.
