Search results for: PESQ

• Revista Eletronica Pesquiseduca

  Journals

  ISSN: 2177-1626

• Pesquisas em Geociencias

  Journals

  ISSN: 1518-2398

• Pesquisa Operacional

  Journals

  ISSN: 0101-7438

• Linguagem-Estudos e Pesquisas

  Journals

  ISSN: 1519-6240 , eISSN: 2358-1042

• Cadernos de Pesquisa

  Journals

  ISSN: 0100-1574

• Revista ENIAC Pesquisa

  Journals

  ISSN: 2316-2341

• Pesquisa Agropecuaria Tropical

  Journals

  ISSN: 1517-6398

• Educacao e Pesquisa

  Journals

  ISSN: 1517-9702

• PESQUISA VETERINARIA BRASILEIRA

  Journals

  ISSN: 0100-736X , eISSN: 1678-5150

• PESQUISA AGROPECUARIA BRASILEIRA

  Journals

  ISSN: 0100-204X , eISSN: 1678-3921

• Administracao-Ensino e Pesquisa

  Journals

  ISSN: 2177-6083 , eISSN: 2358-0917

• Psicologia: Teoria e Pesquisa

  Journals

  ISSN: 0102-3772

• Revista Pesquisa em Fisioterapia

  Journals

  eISSN: 2238-2704

• Spatially variant PSF modeling in confocal macroscopy

  Publication

  • A. Jezierska
  • H. Talbot
  • J. Pesquet

  - Year 2018

  The point spread function (PSF) of imaging systems plays an essential role in image reconstruction. In the context of confocal microscopy, optical performance degrades towards the edge of the field of view. In confocal macroscopy, the related artifacts are even stronger, as the field of view is much larger. Because the related PSFs are strongly spatially variant, it is essential to be able to model them with few parameters. The...

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• Revista Espanola de Estudios Agrosociales y Pesqueros-REEAP

  Journals

  ISSN: 1575-1198

• Global Optimization for Recovery of Clipped Signals Corrupted With Poisson-Gaussian Noise

  Publication

  • A. Marmin
  • A. Jezierska
  • M. Castella
  • J. Pesquet

  - IEEE SIGNAL PROCESSING LETTERS - Year 2020

  We study a variational formulation for reconstructing nonlinearly distorted signals corrupted with a Poisson-Gaussian noise. In this situation, the data fidelity term consists of a sum of a weighted least squares term and a logarithmic one. Both of them are precomposed by a nonlinearity, modelling a clipping effect, which is assumed to be rational. A regularization term, being a piecewise rational approximation of the ℓ0 function...

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• Revista de Estudos e Pesquisas Interdisciplinares em Musicoterapia

  Journals

  ISSN: 2178-2326

• Pesquisa odontologica brasileira = Brazilian oral research

  Journals

  ISSN: 1517-7491

• Revista Brasileira de Pesquisa em Turismo

  Journals

  eISSN: 1982-6125

• Pesquisa Brasileira em Odontopediatria e Clinica Integrada

  Journals

  ISSN: 1519-0501 , eISSN: 1983-4632

• Revista de Pesquisa-Cuidado e Fundamental Online

  Journals

  ISSN: 2175-5361

• Numen. Revista de estudos e pesquisa da religião

  Journals

  ISSN: 1516-1021 , eISSN: 2236-6296

• Boletim do Centro de Pesquisa de Processamento de Alimentos

  Journals

  ISSN: 0102-0323

• Możliwości wprowadzania systemów VoIP w dużych firmach - metodyka, pomiary

  Publication

  • T. Uhl
  • K. Nowicki

  - Year 2010

  W pracy przedstawiono problemy związane z wdrażaniem nowych technologii VoIP w sieciach telekomunikacyjnych, w szczególności firmowych. Opisano standardy usług typu VoIP (H.323, SIP). Scharakteryzowano strumienie przesyłane w systemach VoIP. Zaprezentowano dwa typy migracji do technologii VoIP: miękką i twardą. Wskazano na ważność pomiarów przy wdrażaniu systemów VoIP. Przedstawiono opis podstawowych metod pomiarowych dla usługi...

• Analysis of Lombard speech using parameterization and the objective quality indicators in noise conditions

  Publication

  • K. Kąkol
  • G. Korvel
  • B. Kostek

  - Year 2018

  The aim of the work is to analyze Lombard speech effect in recordings and then modify the speech signal in order to obtain an increase in the improvement of objective speech quality indicators after mixing the useful signal with noise or with an interfering signal. The modifications made to the signal are based on the characteristics of the Lombard speech, and in particular on the effect of increasing the fundamental frequency...

• New approach for determining the QoS of MP3-coded voice signals in IP networks

  Publication

  • T. Uhl
  • S. Paulsen
  • K. Nowicki

  - EURASIP Journal on Audio Speech and Music Processing - Year 2017

  Present-day IP transport platforms being what they are, it will never be possible to rule out conflicts between the available services. The logical consequence of this assertion is the inevitable conclusion that the quality of service (QoS) must always be quantifiable no matter what. This paper focuses on one method to determine QoS. It defines an innovative, simple model that can evaluate the QoS of MP3-coded voice data transported...

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• Improving the quality of speech in the conditions of noise and interference

  Publication

  • B. Kostek
  • K. Kąkol

  - Journal of the Acoustical Society of America - Year 2018

  The aim of the work is to present a method of intelligent modification of the speech signal with speech features expressed in noise, based on the Lombard effect. The recordings utilized sets of words and sentences as well as disturbing signals, i.e., pink noise and the so-called babble speech. Noise signal, calibrated to various levels at the speaker's ears, was played over two loudspeakers located 2 m away from the speaker. In...

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• POPRAWA OBIEKTYWNYCH WSKAŹNIKÓW JAKOŚCI MOWY W WARUNKACH HAŁASU

  Publication

  • K. Kąkol
  • B. Kostek

  - Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej - Year 2018

  Celem pracy jest modyfikacja sygnału mowy, aby uzyskać zwiększenie poprawy obiektywnych wskaźników jakości mowy po zmiksowaniu sygnału użytecznego z szumem bądź z sygnałem zakłócającym. Wykonane modyfikacje sygnału bazują na cechach mowy lombardzkiej, a w szczególności na efekcie podniesienia częstotliwości podstawowej F0. Sesja nagraniowa obejmowała zestawy słów i zdań w języku polskim, nagrane w warunkach ciszy, jak również w...

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• Communication Platform for Evaluation of Transmitted Speech Quality

  Publication

  • A. Ciarkowski
  • A. Czyżewski

  - Journal of Telecommunications and Information Technology - Year 2011

  A voice communication system designed and implemented is described. The purpose of the presented platform was to enable a series of experiments related to the quality assessment of algorithms used in the coding and transmitting of speech. The system is equipped with tools for recording signals at each stage of processing, making it possible to subject them to subjective assessments by listening tests or, objective evaluation employing...

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• REAL-TIME VOICE QUALITY MONITORING TOOL FOR VOIP OVER IPV6 NETWORKS

  Publication

  • B. Namieśnik
  • M. Hoeft
  • K. Nowicki

  - Przegląd Telekomunikacyjny + Wiadomości Telekomunikacyjne - Year 2013

  The primary aim of this paper is to present a new application which is at this moment the only open source real-time VoIP quality monitoring tool that supports IPv6 networks. The application can keep VoIP system administrators provided at any time with up-to-date voice quality information. Multiple quality scores that are automatically obtained throughout each call reflect influence of variable packet losses and delays on voice...

• Improving Objective Speech Quality Indicators in Noise Conditions

  Publication

  • K. Kąkol
  • G. Korvel
  • B. Kostek

  - Year 2020

  This work aims at modifying speech signal samples and test them with objective speech quality indicators after mixing the original signals with noise or with an interfering signal. Modifications that are applied to the signal are related to the Lombard speech characteristics, i.e., pitch shifting, utterance duration changes, vocal tract scaling, manipulation of formants. A set of words and sentences in Polish, recorded in silence,...

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• Messmethoden zur beurteilung der qualität von VoIP-verbindungen

  Publication

  • K. Nowicki
  • T. Uhl

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Year 2006

  Praca jest poświęcona tematyce QoS (Quality of Service) w sieciach IP. Na początku pracy opisano i porównano standaryzowane metody oceny jakości połączeń telefonicznych, tzn. MOS, PAMS, PSQM, PESQ, 3SQM, E-Modell. Następnie przedstawiono nowy efektywny system pomiarowy TraceView®:VoIP. Przy jego użyciu jest możliwy objektywny pomiar jakości usługi VoIP (Voice over IP) w sieciach IP. System ten umożliwia również dokonanie w...