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Ezcurra Guisasola, María Amaya

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https://academica-e.unavarra.es/handle/2454/48993

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Ezcurra Guisasola

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María Amaya

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Física

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1789

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2019 - 20203
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    PublicationOpen Access
    Influence of recording technology on the determination of binaural psychoacoustic indicators in soundscape investigations
    (Institute of Noise Control Engineering, 2019) San Martín Murugarren, Ricardo; Arana Burgui, Miguel; Ezcurra Guisasola, María Amaya; Valencia Leoz, Ana; Ciencias; Zientziak
    The evaluation of soundscapes is mainly carried out through field surveys, using soundwalking methodologies. Through rating scales and annotation of comments, the experiences and expectations of the participants are collected. Acoustic and psychoacoustic indicators are also reported to achieve a complete description of the acoustic environment. Binaural measurement systems should be used for registration in order to consider the way in which humans perceive the acoustic environment. Artificial heads or in-ear binaural microphones are the usual devices for this purpose. Further recording technology such as sound field microphones or microphone arrays are also used in soundscape investigations. These methods can provide a higher level of immersion in a later reproduction of the recorded soundscape through multi-channel setups. However, in contrast to direct binaural recordings, the determination of binaural psychoacoustic indicators requires to perform binaural synthesis by means of Head-Related Transfer Functions and signal processing. In this communication, the influence of different recording devices on obtaining psychoacoustic indicators such as binaural loudness and sharpness is analysed.
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    PublicationOpen Access
    An efficient algorithm for the evaluation of tonality and the determination of the tonal frequency according to IEC 61400-11
    (Institute of Noise Control Engineering, 2019) Arana Burgui, Miguel; San Martín Murugarren, Ricardo; Ezcurra Guisasola, María Amaya; Valencia Leoz, Ana; Llorente, Elena; Ciencias; Zientziak
    The terms of tonality and tonal audibility of the noise emitted by wind turbines are defined and described in the standard IEC 61400-11. The procedure for tonality assessment at different wind speeds based on the narrowband analysis is explained in section 9.5 of the standard. After sorting spectra into wind speed bins, the overall tonal audibility is determined if at least six of ten of the narrowband spectra have an identified tone with the same origin. The standard describes a procedure for tonality assessment by means of a flowchart. Tones of the same origin are treated and reported as one tone. However, the standard does not specify the final value of the frequency of the tone. An efficient algorithm has been developed to evaluate the tonality of the noise emitted by wind turbines. Likewise, different alternatives to specify the final frequency of the tone are discussed, based either on their frequency of appearance in the total of the number of measurements or on the tone levels produced by such frequency.
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    PublicationOpen Access
    Variabilidad del promediado espacial de la reverberación y claridad en la catedral de Valencia
    (Sociedade Portuguesa de Acústica, 2020) Arana Burgui, Miguel; Ezcurra Guisasola, María Amaya; San Martín Murugarren, Ricardo; Giménez, Alicia; Díaz, Elena; Cerdá, Salvador; Cibrián, Rosa; Segura García, Jaume; Ciencias; Zientziak
    ISO 3382-1:2009 especifica los métodos de medición del tiempo de reverberación y de otros parámetros acústicos en salas de espectáculos, así como el método para evaluar los datos y presentar el informe de ensayo. Para un recinto con 8 posiciones de micrófono, hemos analizado la variabilidad de los resultados en función de las posibles ubicaciones de los mismos, cumpliendo todas ellas (un total de 82944 variantes) los criterios establecidos por la norma. Si bien los resultados de las mediciones no se debieran promediar sobre la totalidad de las posiciones de micrófono en la sala, hemos analizado la variabilidad de los promedios, con referencia al JND del parámetro, para dos aspectos: reverberación y claridad del sonido percibido. Para el caso del local reverberante estudiado (Catedral de Valencia) los resultados promedios caracterizan con precisión al local en los aspectos subjetivos analizados.