Rok 2012

• Sample Rate Conversion with Fluctuating Resampling Ratio

  Publikacja

  • M. Blok

  - Archives of Acoustics - Rok 2012

  In this paper a sample rate conversion with continuously changing resampling ratio has been presented. The proposed implementation is based on variable fractional delay filter implemented using a Farrow structure. It have been demonstrated that using the proposed approach instantaneous resampling ratio can be freely changed. This allows for simulation of audio recored on magnetic tape with nonuniform velocity as well as removal...

• Signatures and acoustic images of objects moving in water

  Publikacja

  • G. Grelowska
  • E. Kozaczka
  • S. Kozaczka
  • W. Szymczak

  - Archives of Acoustics - Rok 2012

  Observation of underwater space is part of a generaltrend, which primary purpose is to protect and increasesafety in the selected area. The basic aim of the paper ispresentation of designated acoustic characteristics typicalfor objects moving on the water surface and under water,which represent some knowledge about detection of theseobjects. Create a catalog of acoustic signature and not onlyacoustic, as well as acoustic images...

• Theoretical studies of nonlinear generation efficiency in a bubble layer

  Publikacja

  • A. Baranowska

  - Archives of Acoustics - Rok 2012

  Celem pracy jest teoretyczna analiza propagacji fal o dużym natężeniu w warstwie z pęcherzykami. Przedstawiono model matematyczny zjawiska w tym omówiono problem wyznaczania prędkości fazowej, współczynnika tłumienia i częstotliwości rezonansowej pęcherzyków. Badano zmiany amplitud pierwszej i drugiej harmonicznej ciśnienia fali odbitej i bieżącej w funkcji grubości warstwy oraz względnej koncentracji pęcherzyków. Rozważano pęcherzyki...

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• Tinnitus Therapy Based on High-Frequency Linearization Principles - Preliminary Results

  Publikacja

  • T. Poremski
  • B. Kostek

  - Archives of Acoustics - Rok 2012

  The aim of this work is to present problems related to tinnitus symptoms, its pathogenesis, hypotheses on tinnitus causes, and therapy treatment to reduce or mask the phantom noise. In addition, the hypothesis on the existence of parasitic quantization that accompanies hearing loss has been recalled. Moreover, the paper describes a study carried out by the Authors with the application of high-frequency dither having specially formed...

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Rok 2011

• Acoustic Heating Produced in the Thermoviscous Flow of a Shear-Thinning Fluid

  Publikacja

  • A. Perelomova

  - Archives of Acoustics - Rok 2011

  This study is devoted to the instantaneous acoustic heating of a shear-thinningfluid. Apparent viscosity of a shear-thinning fluid depends on the shear rate. Thatfeature distinguishes it from a viscous Newtonian fluid. The special linear combi-nation of conservation equations in the differential form makes it possible to derivedynamic equations governing both the sound and non-wave entropy mode inducedin the field of sound. These...

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• Application of Vector Sensors to Acoustic Surveillance of a Public Interior Space

  Publikacja

  • K. Łopatka
  • J. Kotus
  • A. Czyżewski

  - Archives of Acoustics - Rok 2011

  Przedstawiono metodę precyzyjnej detekcji i lokalizacji źródeł dźwięku w pomieszczeniach. Wykorzystano wektorowe czujniki akustyczne, dostarczające sygnałów ciśnienia akustycznego i prędkości cząsteczek powietrza. Zaprezentowano metodę lokalizacji źródeł dźwięku na widowni wydarzenia publicznego. Przedstawiono demonstracyjny system zainstalowany w sali wykładowej. System poddano ocenie dokładności na podstawie przeprowadzonych...

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• Comparison of various speech time-scale modificartion methods

  Publikacja

  • A. Kupryjanow
  • A. Czyżewski

  - Archives of Acoustics - Rok 2011

  The objective of this work is to investigate the influence of the different time-scale modification (TSM) methods on the quality of the speech stretched up using the designed non-uniform real-time speech time-scale modification algorithm (NU-RTSM). The algorithm provides a combination of the typical TSM algorithm with the vowels, consonants, stutter, transients and silence detectors. Based on the information about the content and...

• Creating Acoustic Maps Employing Supercomputing Cluster

  Publikacja

  • A. Czyżewski
  • J. Kotus
  • M. Szczodrak

  - Archives of Acoustics - Rok 2011

  The implemented online urban noise pollution monitoring system is presented with regard to its conceptual assumptions and technical realization. A concept of the noise source parameters dynamic assessment is introduced. The idea of noise modeling, based on noise emission characteristics and emission simulations, was developer and practically utilized in the system. Furthermore, the working system architecture and the data acquisition...

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• Formation of acoustic field in rooms

  Publikacja

  • K. Leo

  - Archives of Acoustics - Rok 2011

  Paper describes known form literature method of sound diffusity index assesment, which utilizes impulse response of the room. Process of froming diffused sound field using this method was investigated.Increase of sound diffusity index in time was noted in rooms differing in shape,volume and reverberation time. Exponential growth of sound diffusion index was noted which correlates with other acoustical rooms measures.

• Music Mixing Process Controlled by Hand Gestures

  Publikacja

  • M. Lech

  - Archives of Acoustics - Rok 2011

  W referacie przedstawiono system umożliwiający sterowanie procesami miksowania śladów nagrania muzycznego za pomocą gestów rąk. Przybliżono podstawy wielomodalnej percepcji argumentujące potrzebę powstania tego typu systemu oraz założenia przyjęte w trakcie jego tworzenia. Część sprzętowa systemu składa się z rzutnika multimedialnego, kamery internetowej, komputera klasy PC z zainstalowanym oprogramowaniem systemu oraz ekranu dla...

• Retrospecting Polish Audio Engineering Society Membership on 20th Anniversary of the Polish Section of the Audio Engineering Society

  Publikacja

  • B. Kostek
  • M. Sankiewicz

  - Archives of Acoustics - Rok 2011

  In this article some key events concerning founding Polish Section of the Audio Engineering Society were presented. In addition, the history covering International Symposia on Sound Engineering and Mastering was outlined. Also, papers contained in this issue were shortly reviewed.

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• Sacral sound-engineering

  Publikacja

  • G. Budzyński

  - Archives of Acoustics - Rok 2011

  Organologic and campanologic acoustical problems due to applications to sacral objects are characterized on ground of numerous reviewed publications and engineering reports. Participations of several involved research centres, mostly Polish, at solving these problems are evaluated. Some desirable future developments are indicated. Appendices bring examples of documentation on selected investigated objects.

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• Study of preference for surround microphone techniques, used in the recording of choir and instrumental ensemble

  Publikacja

  • B. Kostek
  • A. Sitek

  - Archives of Acoustics - Rok 2011

  The aim of this paper is to describe the process of choosing the best surround microphone technique for recording of choir with an instrumental ensemble. First, examples of multichannel microphone techniques including those used in the recording are described. Then, the assumptions and details of music recording in Radio Gdansk Studio are provided as well as the process of mixing of the multichannel recording. The extensive subjective...

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Rok 2010

• Long-term comparative evaluation of an acoustic climate in selected schools before and after the acoustic treatment

  Publikacja

  • J. Kotus
  • M. Szczodrak
  • A. Czyżewski
  • B. Kostek

  - Archives of Acoustics - Rok 2010

  The results of long-term continuous noise measurements in two selected schools are presented in the paper. Noise characteristics were measured continuously there for approximately 16 months. Measurements started eight months prior to the acoustic treatment of the school corridors of both schools. An evaluation of the acoustic climates in both schools, before and after the acoustic treatment, was performed based on comparison of...

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• Studies of Nonlinear Sound Dynamics in Fluids Based on the Caloric Equation of State

  Publikacja

  • A. Perelomova
  • P. Wojda

  - Archives of Acoustics - Rok 2010

  The sound speed and parameters of nonlinearity B/A, C/A in a fluid are expressed in terms of coefficients in the Taylor series expansion of an excess internal energy, in powers of excess pressure and density. That allows to conclude about features of the sound propagation in fluids, the internal energy of which is known as a function of pressure and density. The sound speed and parameters of nonlinearity in the mixture consisting...

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Rok 2009

• Acoustic streaming caused by some types of aperiodic sound. Buildup of acoustic streaming

  Publikacja

  • A. Perelomova
  • P. Wojda

  - Archives of Acoustics - Rok 2009

  The analysis of streaming caused by aperiodic sound of different types (switched on at transducer sound or sound determined by initial conditions) is undertaken. The analysis bases on analytical governing equation for streaming Eulerian velocity, which is a result of decomposition of the hydrodynamic equations into acoustic and non-acoustic parts. Its driving force (of acoustic nature) represents a sum of two terms; one is the...

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• Weakly nonlinear dynamics of short acoustic waves in exponentially stratified gas

  Publikacja

  • A. Perelomova

  - Archives of Acoustics - Rok 2009

  Rozpatruje się dynamika krótkich (w porównywaniu z charakterystyczną skalą zmiany gęstości gazu atmosferycznego) fal akustycznych. Wyprowadzone nowe równanie ewolucyjne, które uwzględnia dyspersję i nieliniowy charakter propagacji tych fal. Porównuje sie liniowa i nieliniowa dynamika. Ilustracje propagacji, numeryczne wyliczione na podstawie nowych wzorów, są przedstawione. Indexed and abstracted (from vol. 32(1) 2007) in Science...

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Rok 2008

• Acoustic verification on onomatopoeic sets in contrastive approach

  Publikacja

  • K. Wojan

  - Archives of Acoustics - Rok 2008

• Automatic detection and correction of detuned singing system for use with query-by-humming applications

  Publikacja

  • M. Lech

  - Archives of Acoustics - Rok 2008

  The aim of the paper is to present an idea of using the automatic detection and correction of detuned singing as a subsystem in query-by-humming (QBH) applications. The common approach to searching for a requested song basing on the melody retrieved from hummed pattern usually employs the so-called Parsons code or melody contour. In such a case information about sound pitch is discarded. It was thought out that an additional module...

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• Automatic singing quality recognition employing artificial neural networks

  Publikacja

  • P. Żwan

  - Archives of Acoustics - Rok 2008

  Celem artykułu jest udowodnienie możliwości automatycznej oceny jakości technicznej głosów śpiewaczych. Pokrótce zaprezentowano w nim stworzoną bazę danych głosów śpiewaczych oraz zaimplementowane parametry. Przy pomocy sztucznych sieci neuronowych zaprojektowano system decyzyjny, który oceniono w pięciostopniowej skali jakość techniczną głosu. Przy pomocy metod statystycznych udowodniono, że wyniki generowane przez ten system...

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