Multiple chip rates can be applied to a DS/CDMA system in order to enhance potential system capacity which otherwise is limited by spreading code family size. The technique is called by us 39;39;chip rate division...
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ISBN:
(纸本)7505338900
Multiple chip rates can be applied to a DS/CDMA system in order to enhance potential system capacity which otherwise is limited by spreading code family size. The technique is called by us ''chip rate division multiple access'' (CrdMA). A co-channel interference method based on cross-correlation statistics is used to Study performance of the CrdMA with various spreading code families.
Electroencephalography (EEG) which is the electrical signal recorded by the sensors attached on the human scalp to detect brain activities has been the emerging trends in digital signalprocessing. As compared to proc...
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ISBN:
(纸本)9781509008902
Electroencephalography (EEG) which is the electrical signal recorded by the sensors attached on the human scalp to detect brain activities has been the emerging trends in digital signalprocessing. As compared to processing other types of digital data such as speech or audio signals, EEG signalprocessing is more challenging. However, EEG signals have practically found a wide range of important applications. In this paper, we propose a design of a brain-computer interface (BCI) using EEG's P300 component to a control application. First, we use the Emotiv EPOC headset to capture the raw EEG signals. Then, we adopt a classification algorithm by invoking support vector machine along with the selected extracted features to classify the two-class EEG trials (with and without P300 component). The algorithm is developed to help people express their selection of one among four commands. The experimental results are provided evaluate the classification accuracy.
The analog data acquisition system developed in this paper is integrated into the remote interface unit of aircraft. It uses the high certainty and high real-time performance of the IEEE-1394B bus to realize informati...
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Lately, due to the increasing size of databases, several aspects have been studied in detail, such as grouping, searching for the closest neighbor and other identification methods. It has been found that in the multid...
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ISBN:
(纸本)9781450371469
Lately, due to the increasing size of databases, several aspects have been studied in detail, such as grouping, searching for the closest neighbor and other identification methods. It has been found that in the multidimensional space, the concept of distance does not offer high performance. In this paper, we study the effect of different types of distances on the group to see the similarities between objects. Among these distances we mention two distances: the Euclidean distance and Manhattan distance, implemented in a system developed to identify the architectural styles of the buildings. The aim of this paper is using cluster analysis to identify distance metrics impact in detection of architectural styles using data Mining techniques.
This paper contains a method to implement a mobility aid for blind person and also can be used in automatic robots, self-propelling vehicles in automated production factories etc. Model contains signalprocessing unit...
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ISBN:
(纸本)9781467345286
This paper contains a method to implement a mobility aid for blind person and also can be used in automatic robots, self-propelling vehicles in automated production factories etc. Model contains signalprocessing unit with PIC microcontroller which receives data from Ultrasonic sensor and Temperature sensor then processed it and delivers it to the computer using serial input/output port & gives alert to the blind person using voice processor with earphone. Paper contains temperature compensation method to reduce the error in measurement of distance using ultrasonic sensors. signalprocessing unit contains PIC microcontroller which is used for interfacing between different sensors and computer. Then received data is verified using MATLAB.
MEMS sensors have been used in many applications including navigation systems. However, these sensors suffer from highly noisy measurements. If left untreated, these errors will significantly degrade the ultimate navi...
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ISBN:
(纸本)9781728120850
MEMS sensors have been used in many applications including navigation systems. However, these sensors suffer from highly noisy measurements. If left untreated, these errors will significantly degrade the ultimate navigational solution. Hence, applying a pre-filtering technique becomes a necessity to de-noise these sensor signals to improve the overall system performance. While wavelet denoising is the most common technique for sensor data pre-filtering, it may not be suitable for real-time implementations. This paper explores another method;namely, Savitzky-Golay filters, which can provide competitive denoising performance with a less computationally demanding algorithm. The purpose of the paper is to examine the performance of the new method against wavelet de-noising with respect to both positioning and attitude accuracy and computations time. We applied the filter to denoise MEMS-based inertial sensors data in a tightly coupled integrated INS/GPS system. Our results showed that the new method outperformed the wavelet denoising approach. Moreover, the new method demands much less computations time, which makes it more suitable for embedded systems and real-time applications.
To avoid financial and life risks, early diagnose of bearing faults is particularly important, and this has made intelligent fault diagnosis popular. Intelligent fault diagnosis faces challenges such as the need for s...
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The signal acquisition and processing of homogenizing pressure in high pressure homogenizer are studied. For the measuring requirements of dynamic parameters in high pressure homogenizer, pressure transmitter, the sig...
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ISBN:
(纸本)9781424455379
The signal acquisition and processing of homogenizing pressure in high pressure homogenizer are studied. For the measuring requirements of dynamic parameters in high pressure homogenizer, pressure transmitter, the signal collecting circuits about intensifier pump's motion were selected. The signal acquisition system can perform the functions such as signal collecting, recording and data recalling and so on. Moreover, the wavelet decomposition using 'sym4' at level 10 was used for de-noising of homogenizing pressure signal. The decomposed signal is selected through Birge-Massart threshold strategy and reconstructed. After collected and processed, the homogenizing pressure signal can be the foundational data for analyzing the homogenizing process and improving the crucial structure of high pressure homogenizer.
Operative processing, coding and express analysis of monitoring signals, determination of information states of monitoring objects based on calculation of correlation, spectral, entropy and chaotic parameters of signa...
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Direction coding is the new method of image coding. The human visual model is used to make direction filters and high compressive ratios are obtained. Direction coding not only deals with the continuous component of a...
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ISBN:
(纸本)7505338900
Direction coding is the new method of image coding. The human visual model is used to make direction filters and high compressive ratios are obtained. Direction coding not only deals with the continuous component of an image by subsample it with high compressive ratio, but also does some things with the discontinuous component of the image. We apply direction coding method to narrow band image transmission in a progressive way. Experiments were made on normal telephone lines.
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