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In this work, a complete single-ended readout circuit for capacitive MEMS gyroscope using chopper stabilization technique is presented. A novel noise cancellation technique is used to get rid of the bias noise. The circuit offers superior performance over state of the art readout circuits in terms of cost, gain, and noise for the given area and power consumption. The full circuit exhibits a gain of...
On-site PD measurements are usually intensively interfered by external disturbances such as corona from nearby systems and switching activity from the grid, respectively. Therefore, very often no clear assignment of PD sources to the tested object is possible. However, a substantiated risk assessment requires such assignment and, even more, an identification and location of the PD fault. As the conventional...
For PD measurements in unscreened laboratories, factory environments, or even during on-site conditions, the measuring result is overlaid and sometimes dominated by numerous disturbances. As common-wave interferences such as radio signals, e.g., can easily be suppressed by frequency-domain filters, pulse-like disturbances cannot be eliminated by filters due to their broad-banded frequency spectrum...
This papers explores the perceptual characteristics associated with the application of active noise cancelation (ANC) technologies to headphones. In this popular application, both noise cancelation performance is evaluated in noise & also the impact on the perception of music reproduction in noise. Environmental scenarios were reproduced from B-format recording over a 5-channel loudspeaker setup...
This paper presents a new calibration method to overcome the challenges of MEMS inertial sensors for underwater navigation. The MEMS inertial sensor module is composed of an accelerometer, gyroscope and circuit of signal process. For navigation estimation, it is easy to be influenced by errors which come from MEMS inertial sensors. In general, the sources of error can be categorized into two groups,...
This paper evaluates the possibility of the real time implementation of the median-based filter used for noise reduction from images. The filter involves two procedures: an impulse detection algorithm and the noise filtering. Both the impulse detection and the noise filtering procedures are applied through several iterations for better performance. The real time implementation is based on the Blackfin...
A method is proposed for the analysis of conducted electromagnetic interference (EMI) in multiple power converters connected to the same power line. This method is focused on the phase differences of the sub-harmonic modulation carrier signal for each power converter. It is confirmed that the phase difference among the power converters determines the EMI noise value in a multi-converter system by...
This paper presents a new design method of three-phase inverter for motor drives using software noise separation method. Therefore, no hardware noise separator is required. Moreover, the presented EMI filter design approach provides systematic design procedure and therefore trial-and-error overhead is not required and thereby shortening the development time and saving the cost. The presented method...
Effective reduction of noise is generally difficult because of the possible tight coupling of noise with high-frequency image structure. The problem is worse under low-light conditions. In this paper, we propose slightly optically defocusing the image in order to loosen this noise-image structure coupling. This allows us to more effectively reduce noise and subsequently restore the small defocus....
This paper presents a real time implementation of a noise removal system for audio signals. This system is based on the wavelet approach with level dependant threshold that provides a useful method for noise elimination in the signals. Experimental results show that this method removes noise significantly and the system operates in real time.
Noise suppression has been one of the most difficult tasks in partial discharge (PD) measurements on in-service HV equipment. PD measurements could be seriously affected by disturbances of various origins. There are basically three types of noise: random (white noise), continuous oscillating or pulse-shaped. Although random and continuous oscillating noise could be removed according to its statistic...
Through the use of two trial measurements, this paper reports the use of adaptive noise cancellation techniques to improve AC electrical measurements. Indications of the performance of these adaptive techniques are demonstrated from the results of the two trials.
The goal of this paper is to determine the robustness of the ZigBee wireless networking technology under the influence of interference caused by broadband electromagnetic noise from the operating environment of sensing, monitoring, and control systems. Broadband electromagnetic noise was of interest because such electrical noise (i) does exist and is prevalent due to emissions from electrical and...
As a result of frequency spectrum scarcity and emerging various wireless applications, coexistence and sharing between wireless systems become a recently significant issue. At WRC-07, 790-862 MHz is allocated for IMT-Advanced systems on a co-primary basis in company with existing digital video broadcasting- terrestrial (DVB-T). Therefore, coexistence and sharing requirements must be achieved in terms...
A systemic approach to diagnose and suppress electromagnetic interference (EMI) noise is proposed for single-chip micyoco (SCM) based electronic system. According to analysis the mechanism of SCM production conducted EMI noise and extract the common mode (CM) noise and differential mode (DM) noise, the EMI noise can be diagnosed and suppressed effectively. The feasibility of this method is testified...
In order to pass GB 9254 Class A, a convenient method is proposed to analyze and suppress the radiated electromagnetic interference (EMI) generated by radio frequency identification (RFID) based-systems. Near-field wave impedance is employed to identify the mechanism of it. Then, several shunt capacitors are utilized to reduce the radiated EMI noises due to its fixed structure and intentional radiators...
Impulse radio ultra-wideband offers the potential of high data rate communication and accurate ranging with low power. However, synchronisation of impulse radio systems is known to be difficult. To be able to detect pulses with low energy, the receiver needs to combine multiple pulses. Traditionally, coherent and non-coherent signal combination are used. The vectorial sum of the samples used for coherent...
Musical noise is a typical problem with blind source separation using a time-frequency mask. Recently, the cepstral smoothing of spectral masks (CSM) was proposed. Based on the idea of smoothing in the cepstral domain, this paper proposes the cepstral smoothing of separated signals (CSS) on the assumption that a cepstral representation better reflects the characteristics of speech signals than those...
Around the problem that the wavelet transform modulus maxima de-noising method algorithm has an inferior stability as well as a large number of calculations, another de-noising method based on transmission characteristics of wavelet transform at different scales is discussed-spatially selective noise filtration based on wavelet transform (Spatially Selective Noise Filtration, SNNF). However, in some...
In conductive electromagnetic interference (EMI) noise measurement, noise separation is important for noise diagnosis and suppression. Compared with conventional hardware-based separation, the noise soft separation, which is based on modern signal processing technique, is more robust, convenient and cheap. However, the non-ideal spectrum performance of current probes may have effects on the separation...
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