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In many speech processing applications, the short-time magnitude spectrum is considered important and believed to contain most of the intelligibility. In this paper, magnitude-only signals were generated only with short-time magnitude spectra by randomizing the short-time phase spectra of the original speeches. A sentence intelligibility test was implemented to study the speech intelligibility of...
A pseudo noise ranging system standardized by the Consultative Committee for Space Data Systems (CCSDS) is the most essential technology in satellite operations and space exploration missions. In this paper, we propose shortened pseudo noise (PN) sequences and the combining logic suitable for ranging of space probes, such as low-earth orbit (LEO) or near earth satellites. The suitability of the proposed...
A new small size fractal antenna is proposed for the application in wide-band frequency range. It is designed with the combinations of two fractal geometries. The wideband mechanism is explored by investigating the behaviour of the current on the patch. The length and width of Koch and cantor fractal geometries are optimized to achieve a wide bandwidth. The feed circuit is a microstrip line with a...
In this paper, passive Q-switching is investigated in a 25 km ultra long cavity all-fiber ring laser operating in anomalous dispersion regime. We experimentally demonstrate Q-switched pulses with kHz repetition rate and nano-joule scale pulse energy. More specifically, we obtain a Q-switched pulse train with 52.083 kHz repetition rate and average pulse energy of 10.880 nJ. The Q-switching state threshold...
The marine power system parameters, such as voltage, current, frequency and so on, are measured directly by single-sensor, whose accuracy, stability and reliability is lower. A new parameters measurment method of marine power system is proposed, which is synchronous sampling and distributed data fusion based on the optimal state estimation and the multi-sensor data fusion theory. Parameters measurment...
The traditional signal-subspace projection (SSP) method combats the problem of array manifold uncertainty to gain the robustness by means of projecting the nominal manifold vector onto the signal subspace so as to eliminate the errors lying in the noise subspace. The main contribution of this paper is to extent the SSP approach from one dimension to multi-dimension. We assume that the actual manifold...
Unstirred frequencies of a reverberation chamber (RC) are attributed to its discrete mode distribution. Transient analysis is usually preferred in predicting an RC's mode distribution. For its geometrical flexibility, the time-domain integral equation (TDIE) is suitable for transient analysis of RCs containing stirrers of arbitrary shape. Due to the resonant nature of an RC, a large number of marching...
In this paper, a particle swarm optimization (PSO) based audio watermarking scheme is proposed. The watermark is embedded by modifying singular values of the host audio signal with the spread spectrum method. The designed optimization technique employs PSO to search for optimal watermark strength by keeping adapting the fitness values so that the conflicting requirements of robustness and imperceptibility...
Photoplethysmography (PPG) is a popular non-invasive method of waveform contour analysis in assessing arterial stiffness. Although stiffness index (SI) is a good parameter in assessing atherosclerosis, it dose not perform in aged and arterial stiffness patients, because of their ill-defined diastolic peaks in digital volume pulse (DVP) waveforms. To overcome the limitation, we use the mathematical...
The work presented in this paper aims to develop an optimized switch mode power amplifier (OSMPA) using existing techniques in sigma delta (ΣΔ) architecture that will lead to the design of low cost, low power consumption transceivers with flexible frequency transmission. This design will allow all digital tunability and eliminate the need for cascaded analog components. The implementation will improve...
Facial expression recognition plays an important role in interactive entertainment. In this paper, LSFA (Local Sensitive Frontier Analysis) a novel feature extraction method is introduced for facial expression recognition. LSFA is designed as manifold based feature extraction method to obtain useful features from the facial expression pictures, since the facial expression scatter in high dimensional...
Energy detectors (ED) and transmitted reference (TR) systems are known as promising candidates for noncoherent UWB receivers. One of the challenging issues in TR systems is the implementation of the delay line applied in TR receiver architecture. In order to tackle this problem, code orthogonolized transmitted reference (COTR) has been proposed in the papers in which the orthogonality of data and...
This paper analyzes the impact of various preprocessing modules to improve the performance of automatic speech recognition system (ASR) in noisy environment. After choosing the state-of-the-art algorithms designed in the signal domain and feature domain, their performances in various noise conditions are thoroughly evaluated. Since the enhancement has been directly made to the features that are actually...
The arrangement with 4 LEDs positioned in the corners and 12 LEDs spread evenly on a circle makes the fluctuation of received SNR reduce to 0.85dB. The BER performance does not suffer severely from ISI, where ZF equalization only provides 0.28dB power reduction to achieve BER of 10−3 when the receiver locates in the corner.
In this paper, we propose a fast intra mode decision for high efficiency video coding (HEVC) to reduce its encoding complexity. It proposes an early termination method under its hierarchical structure that uses the intra prediction mode (IPM) of corresponding previous-depth prediction unit (PU) and block size of current-depth transform unit (TU). To reduce even more complexity, the number of candidates...
The sign algorithm is not influenced by impulsive noise, but it exhibits slow convergence rate. Therefore, in this paper, the exponential normalized sign algorithm is proposed for system identification. The proposed algorithm is obtained from the exponential function of the L1 norm of the output error signal. The results of computer simulations proved that the convergence rate of the proposed algorithm...
Next Generation Networks (NGNs) need to handle both high level of service reliability by network survivability mechanism of overprovision redundant network resources (i.e., Blue criteria), as well as minimizing energy cost by turning off unnecessary network resources (i.e., Green criteria). There is an inherent contradiction on satisfying both these Blue and Green requirements simultaneously. In effect...
A compact dual-band bandstop filter (BSF) based on composite right/left handed transmission line (CRLH TL)is proposed and designed without any external impedance matching block. The filter is to suppress the interference of the signal at 5.2 and 5.8 GHz, which is the Unlicensed National Information Infrastructure, radio following the IEEE 802.11a standard and system. The filter is realized by using...
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