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For-EMD regularized deconvolution in acoustic measurement
Published in Kennis Chan, Testing and Measurement: Techniques and Applications, 2015
Y. Dai, J.H. Yang, X.H. Cao, H. Hou
In prior to Fourier-EMDRD process, we should know the information about the impulse response (IR) of the system. Here, MLS (Maximum Length Sequence) is used to measure and estimate the IR of the system. EMD procedure is beyond the scope of this paper, so we will not discuss here. For-EMDRD can be summarized as: 1 Noise variance estimation The observed signal is decomposed into IMFs. Noise variance for the firstIMF1is estimated using the estimator as (Khaldi et al. 2008) :
Loudspeaker measurements
Published in John Borwick, Loudspeaker and Headphone Handbook, 2012
In recent years a new stimulus has established itself as a highly effective measurement tool. A Maximum Length Sequence (MLS) is a periodic binary sequence with some attractive properties, including short measurement times and high signal-to-noise performance. The use of the MLS in acoustic measurements is discussed extensively by Rife and Vanderkooy35.
An estimation method of end-point impedance based on bilateral control system
Published in Advanced Robotics, 2018
Toshiaki Okano, Kouhei Ohnishi, Toshiyuki Murakami
Since the position and the force responses of the master and the slave are matched with the contact position and the external force from environmental objects, the separation of master and slave has to be made deliberately. This paper adds the extra signal to the force controller of both the master and the slave. A maximum length sequence and a sweep sine signal, which include the wide range of frequency information as similar as the white noise, are often utilized for the system identification for satisfying with the persistently exciting. In the case of maximum length sequence, however, the minimum and the maximum frequencies and the cycle of sequences are determined based on the order of its characteristic polynomial. It is hard to consider the appropriate sequence design from the perspective of both frequency and time due to the constraint of uncertainty principle between them. Therefore, this paper applies the sweep sine signal due to its simple design. The control goals are updated as (12) and (13). where denotes the extra signal.