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Acoustic noise is present everywhere and often affects our lives, but it is more troublesome to the patients. When the patient in serious condition is being taken to the hospital in an ambulance, he has to cope with continuous noise of siren. The patient feels annoyed and this can further deteriorate his health condition. Active noise control (ANC) system is employed to conquer the unwanted noise...
Destructive interference is the principle on which ANC (active noise control) system is based. In destructive interference an anti-noise signal is generated using adaptive filter and is superimposed upon noise signal, as a result the unwanted noise is reduced. The secondary path of ANC is assessed off-line prior to use of ANC system when no reference noise exists. But, in practical applications, reference...
Computed Tomography (CT) is streamlined in radiological diagnostics and has become an imperative tool in medical examinations. The difficulty that arises with the demand is to improve CT image quality without increasing dose. In this paper, Wavelet based noise reduction technique is proposed to improve image quality where adaptive Wiener filtering and Wavelet Packet Threshold (WPT) algorithm are applied...
Noise is everywhere and can be serious problem in industry. It has been observed that noisy working atmosphere inhibits the effective work. Besides resulting in loss of concentration and low work output, noise at workplace also results in serious health problems. In IT industry, which is generally considered to be a white collared workplace, some workers are subjected to the severe server noise. The...
We report for the first time high-frequency microwave noise performance on 0.17-\(\mu \) m T-gate In0.17Al0.83N/GaN high-electron mobility transistors (HEMTs) fabricated on Si(111). The HEMTs exhibited a maximum drain current density of 1320 mA/mm, a maximum extrinsic transconductance of 363 mS/mm, an unity current gain cutoff frequency (\(f_{T}\) ) of 64 GHz and, a maximum oscillation frequency...
Many real time applications, they are generated continues flow of data streams have became more popular now a days. Therefore many researches attracted clustering data streams. Most of data stream clustering algorithms based on distance function which find out clusters with spiracle of shape clusters and unable to deal noisy data. Therefore density based clustering algorithms substitute remarkable...
Micro-nano positioning is a fast growing field in the context of its modern day implications in precision engineering industry. However, this apparently indispensible technique has its limitations imposed by the continuous manifestation of non-linearitities like hysteresis and creep. This work explores a relatively new control paradigm in the form of dither to successfully neutralize hysteresis, in...
Hysteresis is a major impediment in achieving precise position tracking through piezo actuated micro nano manipulator. In our study it has been shown that the effect of hysteresis can be mitigated by the proper application of a suitably selected dither sequence. The objective of the paper is to compare the various types of dither viz, Sinusoidal, Gaussian, Rayleigh and Rician, as to which gives the...
Active noise control accuracy depends on how much destructive interference exists between the primary noise and the noise (anti noise) generated by secondary source. In this paper firstly multilayer perceptron (MLP) neural network is designed and trained with extracted features of noise signals for classification and then Empirical Mode Decomposition (EMD) is used for active noise control. The noise...
In the present days, for the human body anatomical study and for the treatment planning medical science very much depend on the medical imaging technology and medical images. Specifically for the human brain, MRI widely prefers and using for the imaging. But by nature medical images are complex and noisy. This leads to the necessity of processes that reduces difficulties in analysis and improves quality...
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