Signal To Noise Ratio
Mostrando 13-24 de 258 artigos, teses e dissertações.
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13. The Effect of Digital Noise Reduction on Annoyance and Speech Perception in Low and High Acceptable Noise Level Groups
Abstract Introduction Studies have reported that although speech perception in noise was unaltered with and without digital noise reduction (DNR), the annoyance toward noise measured by acceptable noise level (ANL) was significantly improved by DNR with the range between 2.5 and 4.5 dB. It is unclear whether a similar improvement would be observed in those
Int. Arch. Otorhinolaryngol.. Publicado em: 25/11/2019
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14. Comparative study between monoexponential and biexponential diffusion weighted imaging sequences in multiparametric prostate magnetic resonance imaging
RESUMO Objetivo: Comparar qualitativa e quantitativamente, em termos de qualidade de imagem, um novo protocolo de sequência de difusão biexponencial com o protocolo de difusão monoexponencial padrão, em ressonância magnética multiparamétrica da próstata. Métodos: Estudo com coleta prospectiva e análise transversal. Entre agosto e novembro de 2017
Einstein (São Paulo). Publicado em: 18/07/2019
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15. Protective effect of gallic acid against cisplatin-induced ototoxicity in rats
Resumo Introdução: A cisplatina é um agente antineoplásico amplamente usado no tratamento de vários tipos de câncer. A ototoxicidade é um dos principais efeitos colaterais que restringem o uso da cisplatina. Objetivo: O objetivo deste estudo foi investigar a eficácia protetora do ácido gálico, em termos bioquímicos, funcionais e histopatológico
Braz. j. otorhinolaryngol.. Publicado em: 10/07/2019
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16. Two-Level Allocation for H-CRAN Architecture Based in Offloading
Abstract The accelerated data and apps growth represents significant challenges to the next generation of mobile networks. Amongst them, it is highlighted the necessity for a co-existence of new and old patterns during the transition of architectures. Thus, this paper has investigated solutions for offloading into a hybrid architecture, also known as H-CRAN
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 19/06/2019
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17. Análise acústica da voz: comparação entre dois tipos de microfones
RESUMO Objetivo Comparar os valores das medidas acústicas da voz, extraídas de gravações vocais realizadas com dois tipos de microfones. Métodos Participaram da pesquisa 103 pessoas do sexo feminino, com idades entre 18 e 54 anos. Foram coletadas amostras da vogal sustentada /e/, captadas por dois microfones, simultaneamente: Shure SM58 e Karsect HT-9
Audiol., Commun. Res.. Publicado em: 23/05/2019
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18. Fluorescent Sensors Based on Cu-Doped Carbon Quantum Dots for the Detection of Rutin
In this paper, Cu-doped carbon quantum dots (Cu-CQDs) were prepared by carrying out thermolysis of Na2[Cu(EDTA)] and hydroxylamine hydrochloride at 300 ºC for 2 h. The as-prepared Cu-CQDs were characterized by UV-Vis, Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and X-ray diff
J. Braz. Chem. Soc.. Publicado em: 08/04/2019
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19. Savitzky-Golay Filter for Denoising Lung Sound
ABSTRACT For computerized analysis of respiratory sounds to be effective, the acquired signal must be free from all the interfering elements. Different forms of noise which can degrade the quality of lung sounds are recording artifacts, power line/Radio Frequency (RF) interferences, ambient acoustic interferences, heart sound interference etc. Such interfere
Braz. arch. biol. technol.. Publicado em: 29/11/2018
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20. Influence of Cryogenic Treatment on the Tribological Behaviour of AISI H21 Tool Steel
The aim of the present work was to find out the optimum cryosoaking duration of deep cryogenic treatment to reduce the wear rate. The AISI H21 hot work tool steel specimens were hardened at 1195 ºC, cryotreated at -185 ºC for 6 to 30 h, double tempered at 540 ºC and soft tempered at 100 ºC. The hardness, impact toughness, wear rate and microstructural ch
Mat. Res.. Publicado em: 29/10/2018
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21. Application of Taguchi Method to Study Morphological Evolution of TiO2 Nanotubes Obtained Via Anodization Process
The growth of titanium dioxide nanotubes (TiO2) via anodization process depends on the controlling parameters such as applied potential, anodization time, and electrolyte composition. In the present work, the Taguchi method was applied to evaluate statistically the influence of the anodization parameters on the morphology of anodized TiO2 films. Mixture of e
Mat. Res.. Publicado em: 15/03/2018
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22. Adaptive Modulation and Code Strategy to Reduce Energy Consumption in Elastic Optical Network
Abstract In this paper, the novel Adaptive Modulation and Code (AMC) algorithm aims to reduce energy consumption in elastic optical network is developed. The proposed AMC algorithm adaptively allocates both, the appropriate modulation and the forward error correction (FEC), according to the actual physical distance and the optical signal to noise ratio (OSNR
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
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23. A wavelet-based method for power-line interference removal in ECG signals
Abstract Introduction The analysis of electrocardiogram (ECG) signals allows the experts to diagnosis several cardiac disorders. However, the accuracy of such diagnostic depends on the signals quality. In this paper it is proposed a simple method for power-line interference (PLI) removal based on the wavelet decomposition, without the use of thresholding t
Res. Biomed. Eng.. Publicado em: 2018-01
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24. An automatic gain control circuit to improve ECG acquisition
Abstract Introduction Long-term electrocardiogram (ECG) recordings are widely employed to assist the diagnosis of cardiac and sleep disorders. However, variability of ECG amplitude during the recordings hampers the detection of QRS complexes by algorithms. This work presents a simple electronic circuit to automatically normalize the ECG amplitude, improving
Res. Biomed. Eng.. Publicado em: 30/11/2017