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A time difference of arrival (TDOA) accurate estimation algorithm in noise background was studied. Common TDOA estimation results are mostly integer times of sample interval, which will result in errors of measurement principle. In this paper, the time of arrival (TOA) estimation results based on Haar wavelet transform is taken as initial value firstly. Then, TDOA less than one sample interval is...
In this paper, we explore calibrations for DT770 Pro, Sennheiser's HD250 headphone and Etymotic Research ER-2 insert earphone with KEMAR. The results have proved that at least for these three earphones, the change of earphone's location will cause the sound pressure level in the subject's tympanic membrane to change. However, only in the relative lowfrequency and high frequency regions, the changes...
Model identification of accelerometer is one of the most pervasive problems in calibration test of accelerometer. A method of calibrating dual orthogonal accelerometers on two-axis table is presented to eliminate the effect of the angle-setting error on calibration, thus enhancing identification precision of the accelerometer. The correlation of the model coefficients of dual orthogonal accelerometers...
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