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- Uguru, J.O. (author), Nwankwo, A.O. (author), Beerends, J.G. (author), Ahamefula, N. (author) article 2020
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Beerends, J.G. (author), Neumann, N.M.P. (author), van den Broek, E.L. (author), Casanovas, A.L. (author), Menendez, J.T. (author), Schmidmer, C. (author), Berger, J. (author)With the introduction of fullband speech coding the question arises what role frequency components above 14 kHz play in speech quality assessment. On the one hand, our results show that bandwidth limitation from 24 kHz down to 14 kHz is not audible to even the most critical subject. On the other hand, 14-24 kHz band limited, audible levels of...article 2020
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Pocta, P. (author), Beerends, J.G. (author)This paper assesses the perceived listening quality of customer support waiting loops using both a subjective experiment as well as an objective perceptual assessment with POLQA (ITU-T Rec. P.863) and VISQOL. A modified version of the methodology defined in the ITU-T Rec. P.835 was derived and used in this paper to subjectively assess the...article 2019
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van der Sluis, F. (author), van den Broek, E.L. (author), van Drunen, A. (author), Beerends, J.G. (author)Bandwidth is still a limiting factor for the Quality of Service (QoS) of mobile communication applications. In particular, for Voice over IP the QoS is not yet as good as for common, well-engineered, public-switched telephone networks. Multisensory communication has been identified as a possibility to moderate this limitation. One of the...article 2018
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Gallardo, L.F. (author), Mittag, G. (author), Moller, S. (author), Beerends, J.G. (author)In telephone conversations, transmitted speech of good to excellent quality is desired for enhanced Quality of Experience and to sustain lasting customer loyalty. Subjective mean opinion scores account for perceived transmitted quality, while instrumental models, such as POLQA, are able to estimate the subjective judgments. To perform subjective...conference paper 2018
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van der Sluis, F. (author), Van Den Broek, E.L. (author), Van Drunen, A. (author), Beerends, J.G. (author)Available bandwidth is still a limiting factor for mobile communication applications. Multisensory communication has already been identified as an possibility to moderate this limitation. One of the strengths of mobile communication lies in its combination of visual and auditory modalities. However, one of the most salient features of mobile...conference paper 2018
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Počta, P. (author), Beerends, J.G. (author)This paper deals with the intelligibility of speech coded by the STANAG 4591 standard codec, including packet loss, using synthesized speech input. Both subjective and objective assessments are used. It is shown that this codec significantly degrades intelligibility when compared to a standard narrowband filtered version of the synthesized...article 2017
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Uguru, J.O. (author), Beerends, J.G. (author), Ebem, D. (author)This study examines the level of speech recognition of English and Igbo utterances by 70 grade four children. The children, whose mother tongue is Igbo and aged between 8 and 10 years, had English monosyllabic words as well as Igbo monosyllabic and disyllabic words dictated to them in noisy and quiet classrooms. The results show that in noise,...article 2017
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Beerends, J.G. (author), van Nieuwenhuizen, K. (author), van den Broek, E.L. (author)We present PREQUEL: Perceptual Reproduction Quality Evaluation for Loudspeakers. Instead of quantifying the loudspeaker system itself, PREQUEL quantifies the overall loudspeakers' perceived sound quality by assessing their acoustic output using a set of music signals. This approach introduces a major problem: subjects cannot be provided with an...article 2016
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Pocta, P. (author), Beerends, J.G. (author)This paper investigates the impact of different audio codecs typically deployed in current digital audio broadcasting (DAB) systems and web-casting applications, which represent a main source of quality impairment in these systems and applications, on the quality perceived by the end user. Both subjective and objective assessments are used. Two...article 2015
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Počta, P. (author), Beerends, J.G. (author)This paper investigates the impact of different telephone channels, represented by impairments as introduced by modern telecommunication networks (e.g. speech coding, bandwidth limitation, packet loss, etc.), on the intelligibility of synthesized speech. Both subjective and objective assessments are used. Two different speech intelligibility...article 2015
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Beerends, J.G. (author), Schmidmer, C. (author), Berger, J. (author), Obermann, M. (author), Ullman, R. (author), Pomy, J. (author), Keyhl, M. (author)In this and the companion paper Part II, the authors present the Perceptual Objective Listening Quality Assessment (POLQA), the third-generation speech quality measurement algorithm, standardized by the International Telecommunication Union in 2011 as Recommendation P.863. In contrast to the previous standard (P.862 Perceptual Evaluation of...article 2013
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Beerends, J.G. (author), Schmidmer, C. (author), Berger, J. (author), Obermann, M. (author), Ullman, R. (author), Pomy, J. (author), Keyhl, M. (author)In this and the companion paper Part I, the authors present the Perceptual Objective Listening Quality Assessment (POLQA), the third-generation speech quality measurement algorithm, standardized by the International Telecommunication Union in 2011 as Recommendation P.863. This paper describes the newly developed perceptual model of this standard...article 2013
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- Nederlandse Organisatie voor Toegepast-Natuurwetenschappelijk Onderzoek (author), Beerends, J.G. (author), van Vugt, J.M. (author) patent 2012
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Ebem, D.U. (author), Beerends, J.G. (author), van Vugt, J. (author), Schmidmer, C. (author), Kooij, R.E. (author), Uguru, J.O. (author)The extent to which the modeling used in objective speech quality algorithms depends on the cultural background of listeners as well as on the language characteristics using American English and Igbo, an African tone language is investigated. Two different approaches were used in order to separate behavioral aspects from speech signal aspects....article 2011
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- Beerends, J.G. (author), TNO Informatie- en Communicatietechnologie (author) public lecture 2010
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- TNO Defensie en Veiligheid TNO Informatie- en Communicatietechnologie (author), Beerends, J.G. (author), van Buuren, R.A. (author), van Vugt, J.M. (author) patent 2010
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- Beerends, J.G. (author) patent 2010
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Beerends, J.G. (author), van Buuren, R. (author), van Vugt, J. (author), Verhave, J. (author), TNO Defensie en Veiligheid TNO Informatie- en Communicatietechnologie (author)The relation between subjective and objective speech intelligibility measurements is researched. For a large series of speech degradations, noise, linear and nonlinear distortions (speech codecs), intelligibility tests were carried out using short CVC words. In the subjective domain the percentage correctly identified words is taken as the...article 2009
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TNO Informatie- en communicatietechnologie (author), Beerends, J.G. (author), van Buuren, R.A. (author), van Vugt, J.M. (author), Verhave, J.A. (author)Several measurement techniques exist to quantify the intelligibility of a speech transmission chain. In the objective domain, the Articulation Index [1] and the Speech Transmission Index STI [2], [3], [4], [5] have been standardized for predicting intelligibility. The STI uses a signal that contains spectro-temporal characteristics similar to...conference paper 2009
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