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The paper addresses principles of construction and ways of analyzing an electro-optical probing and characterizing the Brillouin gain contour, based on methods of poly-harmonic probing radiation and evaluation of the parameters by estimating envelopes of its beat frequencies at stages of searching the center frequency, determining the maximum power and width of the contour as basic characteristics...
Optimal experimental design is used to either reduce the number of experiments to be performed or to get as much information from the available data and data retrieved from a pre-determined set of experiments. An optimal experimental design aims at minimizing the cost of experimentation and still getting useful data to determine the process properties. This data in turn can be used to construct a...
Complex electronic systems include multiple power domains and drastically varying dynamic power consumption patterns, requiring the use of multiple power conversion and regulation units. High frequency switching converters have been gaining prominence in the DC-DC converter market due to their high efficiency. Unfortunately, they are also subject to higher process variations jeopardizing stable operation...
This paper proposes a new semi-analytic robust mixed H2/H-infinity design method for fixed-structure controllers. Precisely, the method consists in determining the parameters of a controller with given structure such that it minimizes the influence of a step load disturbance to the process output with respect to robustness constraints, i.e. constraints on maximum amplification of measurement noise,...
A minimax LQG control approach is used to synthesize a controller which minimizes noise level at a specified location in an acoustic duct. This controller is robust against uncertainties introduced by neglecting the higher order modes of the duct.
We have designed an FPGA based multiple-input multiple-output (MIMO) power line communications (PLC) Channel Emulator in our research lab over the last years. This paper will demonstrate verification and testing results achieved with the emulator. It also presents comparisons between PLC modem performance results at typical channels within the field and their corresponding emulated performances. Furthermore,...
This paper introduces a violin playing robot that imitates the playing technique of human. A violinist learns how to play through an endless practice. A bowing velocity, bowing force, and sound point are important factors in determining the sound quality. Thus, in this paper, the sound quality has been analyzed in the variable speed using the violin playing robot, where an industrial vertical multi-joint...
Inertial navigation sets a very stringent requirement on the long-term stability of an accelerometer, which is characterized by bias instability. Long-term stability demands a very low-noise design. Accelerometers based on capacitance sensing are the mainstream MEMS accelerometers reported recently [1-3]. The state-of-the-art achieves 1μg bias instability and 2μg/Hz1/2 resolution with a full scale...
Local field potential (LFP) has been of growing interest in interpreting specific motor activities and higherlevel cognitive functions for neurophysiological investigation. LFP denote the neural activity recorded from the ensemble of neurons which carry information in the frequency range of 1–200 Hz. The requirements on the electronics of an amplifier sensor used to measure LFP signals is very stringent,...
This paper describes a simulator for presenting normal hearing (NH) listeners with the experience of a hearing impaired (HI) listener. The simulator is based on the compressive gammachirp (cGC) filter used to derive level-dependent filter shapes and the cochlear compression function from to notched-noise masking data. The level dependence of the cGC is reversed to produce inverse compression which...
DC/DC converters are widely used to provide various power supply voltages required for many electronic components on a board. Though DC/DC converter is more efficient than the linear regulator is, however, the switching noise becomes larger with the increase of the switching frequency. In particular, ringing noises at the sharp rising edge of the switching waveform occurs by the effect of the parasitic...
Acoustic noise is one of the undesirable consequences of the harmonic currents fed into an induction motor by a voltage source inverter. If the inverter is modulated at a fixed switching frequency, the resulting current harmonic components are located in narrow bands around integral multiples of the switching frequency. This causes discrete tonal noise which is unpleasant to human ear. This paper...
Narrowband active noise control (ANC) systems enjoy good performance where sinusoidal signals dominate in the primary noise, on condition that a reference signal of the same frequencies with the primary noise is given. However, frequencies of the reference signal provided by nonacoustic sensors are usually different from that of the primary noise due to temperature changes, aging, etc. Such frequency...
A highly accurate 6 DOF real-time navigation system for minimally-invasive surgical interventions is presented. The system consists of short range acoustic transducers that combine time-of-flight and carrier-phase measurements and a standard inertial measurement unit. With Hybrid Extended Kaiman Filtering, a precise pose estimation of the surgical instrument is achieved. In this contribution, simulation...
In this paper a phase detection method for fault diagnosis of the induction motors has been presented. The proposed method has a powerful environmental noise suppression capability. It has been shown in literature that the performance of the previously used fault detection method (instantaneous power analysis) was affected by the environmental noise, switching disturbances and other low order harmonics...
Voice is important for professionals like speakers, teachers, actors, singers and it is the important tool for communication. Laryngeal pathologies induce perturbations in the speech signal. Speech signal is discriminated as pathological or healthy based on roughness - breathiness - hoarseness (RBH) in the quality of signal. In recent years pattern recognition along with various signal processing...
This paper presents a new permittivity measurement method by using a reverberation chamber (RC). The absorption cross section (ACS) is measured first. By comparing the measured ACS with the analytical value and considering the frequency dependency, both the real part and the imaginary part of the permittivity can then be obtained. Finally, self-explanatory results can be obtained; the limitations...
DC/DC converters are widely used to produce various power supply voltages required for various electronic components on a board. Though DC/DC converter is more efficient than the linear regulator is, however, the switching noise becomes larger with the increase of the switching frequency. In particular, ringing noises at the sharp rising edge of the switching waveform generated by the effect of the...
A high performance Advanced Metering Infrastructure (AMI) is key to the adequate development of the Smart Grid. There are several technologies that can be used to deploy it, being PLC (Power Line Communications) the most extended, at least in western European countries. A PLC AMI is composed of a data concentrator and a number of meters, being restricted to a transformer substation due to the properties...
We present an in-situ antenna characterization method and results for a “low-frequency” radio astronomy engineering prototype array, characterized over the 75–300 MHz frequency range. The presence of multiple cosmic radio sources, particularly the dominant Galactic noise, makes in-situ characterization at these frequencies challenging; however, it will be shown that high quality measurement is possible...
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