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  • Comparative Studies. Non-European Languages/Literatures  (17)
  • 1
    Online Resource
    Online Resource
    Underwater sound radiation from an elastically coated infinite plate with periodic inhomogeneities of finite width
    Acoustical Society of America (ASA) ; 2017
    In:  The Journal of the Acoustical Society of America Vol. 142, No. 1 ( 2017-07-01), p. 91-102
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 142, No. 1 ( 2017-07-01), p. 91-102
    Abstract: The underwater sound radiation from a line-force-driven coated infinite plate with periodically attached distributed inhomogeneities is investigated. A typical example of a distributed inhomogeneity is a signal conditioning plate (SCP), which can be inserted between the coating and a hydrophone to increase the strength of the incoming signal. Using the wavenumber transform approach, the surface normal velocity and radiated sound power of the plate are determined by solving the indexed equations of the wavenumber components. This study demonstrates that the elastic coating between the base plate and periodic inhomogeneities may reduce the effect of band-passes and band-gaps on the radiated sound power caused by the inhomogeneities. This is explained in detail by the insulation effect of the coating as a decoupler. The effect of the SCP's width and spatial period on the radiated sound is also examined. Finally, recommendations are given for the application of SCPs for underwater sensing purposes.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4985127
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2017
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Automatic detection and classification of marmoset vocalizations using deep and recurrent neural networks
    Acoustical Society of America (ASA) ; 2018
    In:  The Journal of the Acoustical Society of America Vol. 144, No. 1 ( 2018-07-01), p. 478-487
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 144, No. 1 ( 2018-07-01), p. 478-487
    Abstract: This paper investigates the methods to detect and classify marmoset vocalizations automatically using a large data set of marmoset vocalizations and deep learning techniques. For vocalization detection, neural networks-based methods, including deep neural network (DNN) and recurrent neural network with long short-term memory units, are designed and compared against a conventional rule-based detection method. For vocalization classification, three different classification algorithms are compared, including a support vector machine (SVM), DNN, and long short-term memory recurrent neural networks (LSTM-RNNs). A 1500-min audio data set containing recordings from four pairs of marmoset twins and manual annotations is employed for experiments. Two test sets are built according to whether the test samples are produced by the marmosets in the training set (test set I) or not (test set II). Experimental results show that the LSTM-RNN-based detection method outperformed others and achieved 0.92% and 1.67% frame error rate on these two test sets. Furthermore, the deep learning models obtained higher classification accuracy than the SVM model, which was 95.60% and 91.67% on the two test sets, respectively.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5047743
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2018
    detail.hit.zdb_id: 1461063-2
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  • 3
    Online Resource
    Online Resource
    Handbook of Cognitive Linguistics : Ewa Dąbrowska and Dagmar Divjak (eds) Berlin and Boston: De Gruyter Mouton, 2015, 716 + viii pp.
    Informa UK Limited ; 2019
    In:  Australian Journal of Linguistics Vol. 39, No. 4 ( 2019-10-02), p. 535-539
    Details
    In: Australian Journal of Linguistics, Informa UK Limited, Vol. 39, No. 4 ( 2019-10-02), p. 535-539
    Type of Medium: Online Resource
    ISSN: 0726-8602 , 1469-2996
    URL: Article
    DOI: 10.1080/07268602.2018.1507420
    RVK:
    EQ 1000
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2007038-X
    SSG: 7,29
    SSG: 7,11
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  • 4
    Online Resource
    Online Resource
    Underwater sound scattering and absorption by a coated infinite plate with attached periodically located inhomogeneities
    Acoustical Society of America (ASA) ; 2015
    In:  The Journal of the Acoustical Society of America Vol. 138, No. 5 ( 2015-11-01), p. 2707-2721
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 138, No. 5 ( 2015-11-01), p. 2707-2721
    Abstract: This paper extends previous work of Zhang and Pan [J. Acoust. Soc. Am. 133(4), 2082–2096 (2013)] on sound scattering and absorption by an underwater coated plate with a single attached distributed-inhomogeneity to that with periodically located distributed-inhomogeneities. A comparison is made among cases of a plate without inhomogeneities, a plate with inhomogeneities, and one with inhomogeneities ignoring the mutual coupling. Results show that coupling of the structural waves scattered by the inhomogeneities plays an important role in modifying the sound absorption and scattering of surface sound pressure, especially at low frequencies and/or the resonance frequencies of the trapped modes of the plate. The sound absorption of the plate is dependent on the distance between the adjacent inhomogeneities, the length of the inhomogeneity, and the angle of the incident sound. On the surface of the inhomogeneities, the scattered/total sound pressure is generally enhanced. On the surface in between the inhomogeneities, the pressure is also enhanced at low frequencies but is nearly unchanged at higher frequencies. Results also show that the coupling-induced variation of scattered/total pressure is significant only at the resonance frequencies of the global modes and trapped modes. The surface normal velocity is presented to explain the coupling-induced variations in the vibration and pressure fields.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4932167
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2015
    detail.hit.zdb_id: 1461063-2
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  • 5
    Online Resource
    Online Resource
    Sound radiation from a fluid-loaded and elastically coated infinite plate with attached periodically located inhomogeneities
    Acoustical Society of America (ASA) ; 2016
    In:  Journal of the Acoustical Society of America Vol. 140, No. 4_Supplement ( 2016-10-01), p. 3160-3160
    Details
    In: Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 140, No. 4_Supplement ( 2016-10-01), p. 3160-3160
    Abstract: An analytical model is developed for evaluating the sound radiation characteristics of a fluid-loaded and elastically coated infinite plate attached with periodically located inhomogeneities. The vibration and sound responses of such a periodic structure under a local excitation are obtained through wavenumber transformation method. The radiation characteristics of the plate are investigated via comparing with those of a plate with a single inhomogeneity and one without inhomogeneities. Three interesting features of the sound radiation are observed, which are related to plate’s global resonant modes, local resonances of the trapped modes formed around each inhomogeneity, and the band-pass characteristics of the periodicity, respectively. These features are explained by the variation in the surface supersonic wavenumber components and the waveguide properties of the fluid-loaded composite plate and the coherent resonance of all inhomogeneities.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4969922
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2016
    detail.hit.zdb_id: 1461063-2
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  • 6
    Online Resource
    Online Resource
    Sound radiation from a fluid-loaded plate with periodic inhomogeneities of finite width
    Acoustical Society of America (ASA) ; 2016
    In:  The Journal of the Acoustical Society of America Vol. 140, No. 4 ( 2016-10-01), p. 2437-2444
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 140, No. 4 ( 2016-10-01), p. 2437-2444
    Abstract: This paper focuses on the frequency-filtering behavior of the structural vibration and sound radiation of a fluid-loaded plate with periodic inhomogeneities of finite width. The passbands of the flexural waves in the plate and the frequency bands of effective sound radiation from the plate are examined for air and water loading conditions. The mechanisms that generate the differences in these two bands are explained by analyzing the dispersion curves of the waves in the plate and the sound radiation behavior of supersonic wavenumber components in the plate vibration. The effects of fluid loading on the properties of these two bands are highlighted. A parametric study is also conducted to illustrate the effects of the width and magnitude of the inhomogeneities on the sound radiation characteristics.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4962349
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2016
    detail.hit.zdb_id: 1461063-2
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  • 7
    Online Resource
    Online Resource
    An ER-fMRI investigation of morphological inflection in German reveals that the brain makes a distinction between regular and irregular forms
    Elsevier BV ; 2003
    In:  Brain and Language Vol. 85, No. 1 ( 2003-4), p. 67-92
    Details
    In: Brain and Language, Elsevier BV, Vol. 85, No. 1 ( 2003-4), p. 67-92
    Type of Medium: Online Resource
    ISSN: 0093-934X
    URL: Article
    DOI: 10.1016/S0093-934X(02)00560-6
    RVK:
    EQ 1000
    RVK:
    XA 10000
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2003
    detail.hit.zdb_id: 1462477-1
    SSG: 5,2
    SSG: 7,11
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  • 8
    Online Resource
    Online Resource
    Analysis of total harmonic distortion of miniature loudspeakers used in mobile phones considering nonlinear acoustic damping
    Acoustical Society of America (ASA) ; 2021
    In:  The Journal of the Acoustical Society of America Vol. 149, No. 3 ( 2021-03-01), p. 1579-1588
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 149, No. 3 ( 2021-03-01), p. 1579-1588
    Abstract: Total harmonic distortion (THD) plays an important role in the performance of miniature loudspeakers used in mobile phones. Traditional nonlinear models fail to predict THD in the higher frequency domain. Significant discrepancies can be found between the prediction and measurement. In this study, an extended model considering nonlinear acoustic damping is proposed to address this issue. Flow separation occurring near the orifices of the sound port is of particular interest. Two velocity-dependent parameters were derived to model the nonlinear damping effect. Based on the extended model, the dynamics of miniature loudspeakers are described using the state-space method. Experiments and calculations confirm the validity of the extended model. The influence of nonlinear acoustic damping on THD is also discussed.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0003644
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2021
    detail.hit.zdb_id: 1461063-2
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  • 9
    Online Resource
    Online Resource
    Sound speed measurement with direct-sequence spread spectrum signal combining time of flight and phase shift
    Acoustical Society of America (ASA) ; 2012
    In:  The Journal of the Acoustical Society of America Vol. 132, No. 3_Supplement ( 2012-09-01), p. 2094-2094
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 132, No. 3_Supplement ( 2012-09-01), p. 2094-2094
    Abstract: Increasing demands for high accuracy and rapid measurement of sound speed have prompted the development of portable sound velocimeter in oceanography. Generally, sound speed can be established by CTD or TD (Time Delayed) method respectively. CTD method suffers from errors of corresponding sensors and application range of the converting equations. TD method, sing-around technique representative, is widely used in portable velocimeter. The accuracy of TD is proportional to receiving SNR and signal length. The duration of tone burst in convenient sing-around is limited by multi-echo, thus only a few valid data can be utilized. To address the problems, DSSS (Direct-Sequence-Spread-Spectrum) signal in continuous form is adopted to extract the TD directly, with which sound speed could be established related to laboratory derived equations, Del Grosso’s equation representative. Based on this method, two separate transducers were deployed with constant distance. Cross-correlation between received and transmitted (orthogonal form) signals is computed. Combine Time-of-Flight and Phase-Shift, the TD can be derived by two processes, the peak detecting of cross-correlation envelope and carrier phase estimating. Theoretic analyses and experiments indicate that the accuracy with DSSS relates to the period of PN sequence, the frequency of chip, and the linearity characteristic of electronic circuits and transducers.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4755743
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2012
    detail.hit.zdb_id: 1461063-2
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  • 10
    Online Resource
    Online Resource
    A simple and effective noise whitening method for underwater acoustic orthogonal frequency division multiplexing
    Acoustical Society of America (ASA) ; 2010
    In:  The Journal of the Acoustical Society of America Vol. 127, No. 4 ( 2010-04-01), p. 2358-2367
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 127, No. 4 ( 2010-04-01), p. 2358-2367
    Abstract: Underwater acoustic orthogonal frequency division multiplexing (OFDM) enables simple frequency domain equalization, but its performance is often limited by intercarrier interference (ICI) that is induced by channel variation, in addition to the ambient noise. As the signal itself, the variance of the ICI is frequency dependent as (i) the transmitter often has a nonideal transmit voltage response (TVR) and (ii) underwater acoustic propagation introduces frequency dependent attenuation. In this paper, a simple method to account for the frequency dependent spectrum of the ICI plus noise is proposed. Specifically, the power spectrum of the ICI plus noise is approximated using a low-order polynomial in the log domain, by fitting the measurements on the null subcarriers embedded in each OFDM symbol. Prewhitening is then applied to each OFDM symbol before channel estimation and data demodulation. The proposed method is tested using experimental data collected from the SPACE08 and RACE08 experiments, where signals with and without transmitter precompensation are compared side by side in the former. Impressive performance gains are found whenever the signal is significantly colored. This is the case when either the TVR is not compensated or the transmission distance and bandwidth are large.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3309452
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2010
    detail.hit.zdb_id: 1461063-2
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