Signal rectifying and detecting in the NI ELVIS complex

Author(s):  
E.B. Solovyeva ◽  
◽  
K.S. Ezerov ◽  
Yu.M. Inshakov ◽  
◽  
...  

A half-wave diode rectifier is represented as a nonlinear circuit to study in a laboratory course of electrical engineering. The control and measurement complex NI ELVIS effectively displays the nonlinear circuit properties using oscillograms and spectrograms of signals. The coefficients of ripples and nonlinear distortions are calculated. They help to evaluate the influence of the circuit parameters on the quality of signal conversion when rectifying and detecting. The advantages of the NI ELVIS complex consist in, for instance, the real-time digital signal processing, the visualization of results, the ergonomic visualization tools. These advantages provide clarity and precision in the presentation of complex nonlinear processes in electrical engineering.

2017 ◽  
Vol 65 (2) ◽  
pp. 2_9-2_14
Author(s):  
Makoto TANAKA ◽  
Yoshio BANDO ◽  
Mitsuo YOKONUMA ◽  
Masao YAMAWAKI

2010 ◽  
Vol 56 (4) ◽  
pp. 345-350
Author(s):  
Mariusz Rawski

Modified Distributed Arithmetic Concept for Implementations Targeted at Heterogeneous FPGAsDistributed Arithmetic (DA) plays an important role in designing digital signal processing modules for FPGA architectures. It allows replacing multiply-and-accumulate (MAC) operations with combinational blocks. The quality of implementations based on DA strongly depends on efficiency of methods that map combinational DA block into FPGA resources. Since modern FPGAs have heterogeneous structure, there is a need for quality algorithms to target these structures and the need for flexible architecture exploration aiding in appropriate mapping. The paper presents a modification of DA concept that allows for very efficient implementation in heterogeneous FPGA architectures.


Author(s):  
А.А. Пирогов ◽  
Ю.А. Пирогова ◽  
С.А. Гвозденко ◽  
Д.В. Шардаков ◽  
Б.И. Жилин

Цифровая фильтрация распознаваемых сигналов является непременной процедурой при обнаружении и распознавании сообщений. Под фильтрацией понимают любое преобразование сигналов, при котором во входной последовательности обрабатываемых данных целенаправленно изменяются определенные соотношения между различными параметрами сигналов. Системы, избирательно меняющие форму сигналов, устраняющие или уменьшающие помехи, извлекающие из сигналов определенную информацию и т.п., называют фильтрами. Соответственно, фильтры с любым целевым назначением являются частным случаем систем преобразования сигналов. Программируемые логические интегральные схемы (ПЛИС) представляют собой конфигурируемые интегральные схемы, логика работы которых определяется посредством их программирования. Применение ПЛИС для задач цифровой обработки сигналов позволяет получать устройства, способные менять конфигурацию, подстраиваться под определенную задачу за счет их гибко изменяемой, программируемой структуры. При разработке сложных устройств могут применяться в качестве компонентов для проектирования готовые блоки - IP-ядра или сложно-функциональные блоки (СФ-блоки). Использование программных СФ-блоков позволяет наиболее эффективно задействовать их в конечной структуре, в значительной степени сократить затраты на проектирование. Цель работы состоит в построении RTL модели СФ-блока цифровой обработки сигналов, его верификации как на логическом уровне, так и физическом Digital filtering of recognized signals is an indispensable procedure for the detection and recognition of messages. Filtering is understood as any transformation of signals in which certain relationships between different signal parameters are purposefully changed in the input sequence of the processed data. Systems that selectively change the shape of signals, eliminate or reduce interference, extract certain information from the signals, and so on, are called filters. Accordingly, filters with any purpose are a special case of signal conversion systems. Programmable logic integrated circuits (FPGAs) are configurable integrated circuits whose logic is defined through programming. The use of FPGAs for digital signal processing tasks makes it possible to obtain devices capable of changing the configuration, adapting to a specific task due to their flexibly changeable, programmable structure. When developing complex devices, ready-made blocks - IP-cores or complex-functional blocks (SF blocks) - can be used as components for design. The use of software SF-blocks allows them to be used most effectively in the final structure, to a significant extent to reduce design costs. The purpose of the work is to build an RTL model of the SF-block for digital signal processing, its verification both at the logical and physical levels


2014 ◽  
Vol 17 (1) ◽  
pp. 32-38
Author(s):  
Nhat Truong Minh Vu ◽  
Binh Hieu Nguyen ◽  
Nhat Minh Pham ◽  
Thuan Huu Huynh ◽  
Tu Trong Bui ◽  
...  

Text To Speech (TTS) using Hidden Markov Model (HMM) has become popular in recent years. However, because most of such systems were implemented on personal computers (PCs), it is difficult to offer these systems to real applications. In this paper, we present a hardware implementation of TTS based on DSP architecture, which is applicable for real applications. By optimizing hardware architecture, the quality of the DSP-based synthesized speech is nearly identical to that synthesized on PCs.


Author(s):  
Witold Kinsner

Conversion of signals is fundamental to theinterfacing of embedded systems. Such signal conversionsinclude (i) analog-to digital (A/D) in order to translate ananalog form of the signal to its sampled and quantized formfor digital signal processing, (ii) digital-to-analog (D/A) inorder to translate the digital samples to a correspondingboxcar signal for further low-pass filtering and recovery ofthe original signal, and (iii) digital-to-digital (D/D) toachieve new desired properties of the data.This paper focuses on teaching the delta-sigma (ΔΣ)A/D conversion that is often omitted from an interfacingcourse because it appears to be a difficult topic tocomprehend and to teach. This new approach links the newΔΣ conversion to the other classes of A/D conversiontechniques explicitly, thus unifying and simplifying theteaching of signal conversions.


2015 ◽  
Vol 7 (4) ◽  
pp. 63
Author(s):  
Azeddine Wahbi ◽  
Ahmed Roukhe ◽  
Laamari Hlou

The aim of this paper is to design and simulate an AEC in order to enhance the quality of speech disturbed by echo phenomenon. Therefore, in order to design the normalized adaptive AEC, we have used digital signal processing techniques, especially Simulink embedded functions. Effectiveness of the suggested AEC using adaptive normalized algorithm was verified using Matlab/Simulink software. Finally, our AEC has been tested by using ERLE criteria and the analysis results show more efficiency according to ITU-T recommendation G.168.


the diseases of plants is one of the major reason behind the reduction in the amount and quality of agricultural productivity. Great difficulties are encountered by farmers for the control and diagnosis of diseases of plants. Thus it becomes crucial to detect the diseases of plants during the initial stages for the suitable and timely action in order to avoid further losses. The approach of image processing is followed for detecting the diseases of cashew plants in this project. The image of leaf is uploaded on the system for the identification of cashew disease. A set of algorithms are used in a system for the identification of type of disease. The several processing steps are followed at the image given as input for the detection of disease and results are displayed to the user via android application.


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