Subjective Assessment of the Speech Signal Quality Broadcasted by Local Digital Radio in Selected Locations in Wroclaw under Studio and Home Conditions

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Abstract

In October 2018, local digital radio was launched to cover the agglomeration of Wroclaw. The implementation of this undertaking required many tests, including qualitative ones, that refer to both music and speech. This paper presents the results of subjective tests based on the evaluation of speech quality of signals recorded at various points in Wroclaw. Measurements were carried out in accordance with the recommendations of the International Telecommunication Union as well as in ordinary acoustic conditions in listeners’ flats. The rating was made for male and female voices. The most important conclusion is that for speech signal assessment in meaning of the quality the test conditions do not influence the obtained results. The other fact confirmed in the experiment was that the receiving place of DAB+ signal in the Single-Frequency Network also does not affected the perceived voice quality.

References

D. Niewiadomski, R. Michniewicz, J. Sobolewski, D. Więcek, „Planning of the local Single-Frequency-Network of DAB+” („Planowanie lokalnej sieci jednoczęstotliwościowej radiofonii cyfrowej DAB+”), Przegląd Telekomunikacyjny - Wiadomości Telekomunikacyjne, 6, 513 – 516, 2017 (in Polish).

W. Hoegh, T. Lauterbach, „Digital Audio Broadcasting: Principles and Applications of DAB, DAB+ and DMB”, 3rd ed., Wiley, England, 2009.

I. Michalski, R. J. Zieliński, „Verification Methodology of Fade Characteristics in a DAB+ SFN in Wroclaw”, Int. Journal of Electronics and Telecommunications, vol. 67, no 3, 537-542, 2021.

K. Brandenburg, “MP3 and AAC explained”, in: Proc. of 17th International Conference on High Quality Audio Coding, Audio Eng. Society, Florence, Italy, 1999.

K. Sayood, “Introduction to Data Compression”, 4th Edition, Elsevier, Waltham, MA, 2012.

J Breebaart, S.Van de Par, A. Kohlrausch, E. Schuijers, “Parametric Coding of Stereo Audio”, EURASIP Journal on Applied Signal Processing, 9, 1305-1322, 2005.

S. Brachmański, M. Kin, “Quality evaluation of sound broadcasted via DAB+ system based on a single frequency network”, in: Proc. of 144th Convention of Audio Eng. Society, Milan, Italy, preprint 10004, 2018.

S. Brachmański, “Test material used to assess speech quality in Poland”, in: Acoustics, acoustoelectronics and electrical engineering, F. Witos (ed.), Gliwice, 65-79, 2021.

P. Gilski, “DAB vs DAB+ radio broadcasting: a subjective comparative study”, Archives of Acoustics, 42 (4), 715–723, 2017.

M. Kin, “Subjective evaluation of sound quality of musical recording transmitted via DAB+ system”, in: Proc. of 134th Convention of Audio Eng. Society, Rome, Italy, preprint 8874, 2013.

A. Dobrucki, M. Kin, “Subjective and Objective evaluation of sound quality of radio programs transmitted via Digital Audio Broadcast System[DAB+]”, in: Proc. of Meetings on Acoustics, 19, 1, 1-7. 2013.

P. Gilski, J. Stefański, “Subjective and Objective Comparative Study of DAB+ Broadcast System”, Archives of Acoustics, 42 (1), 3-11, 2017.

M. Kin, S. Brachmański, “Quality assessment of musical and speech signals broadcasted via single frequency network DAB”, Int. Journal of Electronics and Telecommunications, vol. 66, no 1, 139-144, 2020.

P. Počta, J. G. Beerends, “Subjective and Objective Assessment of Perceived Audio Quality of Current Digital Audio Broadcasting Systems and Webcasting Applications”, IEEE Transaction and Broadcasting, 61, 3, 407-415, 2015.

ITU-T Recommendation P.800, Methods for subjective determination of transmission quality, Geneva, Switzerland, 1996.

S. Brachmański, “Selected problems of speech transmission quality assessment” (“Wybrane zagadnienia oceny jakości transmisji sygnału mowy”), Wrocław University of Science and Technology Edition, 2015, (in Polish).

ITU Recommendation BS.1534-1, Method for the subjective assessment of intermediate quality level of coding systems, Geneva, Switzerland, 2003.

A. Perry, “Fundamentals of Voice-Quality Engineering in Wireless Networks, Cambridge University Press, Cambridge, 2007.

S. Zieliński, “Is a Multi-Slider Interface Layout Responsible for a Stimulus Spacing Bias in the MUSHRA Test?”, Archives of Acoustics, 40, 4, 585-594, 2015.

N. Rurzyńska, “Realization of acoustical signals database to assess of speech quality in digital radio LocalDAB+ in Wroclaw”, (“Realizacja akustycznej bazy sygnałów testowych do oceny jakości mowy w radiofonii cyfrowej LokalDAB na terenie Wrocławia”), Wrocław University of Science and Technology, Engineering Thesis, 2019 (in Polish).

F. Rumsey, “Telling the difference – preference and prediction”, J. Audio Eng. Soc., 68, (10): 774 -778, 2020.

R. J. Zieliński, “Conditions for obtaining correct DAB+ signal reception on a single frequency network”, („Warunki uzyskania poprawnego odbioru sygnału DAB+ w sieci jedno-częstotliwościowej”), Przegląd Telekomunikacyjny - Wiadomości Telekomunikacyjne, 6, 509 – 512 (in Polish).

S. Brachmański, “Quality evaluation of speech AAC and HE-AAC coding”, in: 2018 Joint Conference – Acoustics, Ustka, Poland; 2018.

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Published

2024-04-19

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ARTICLES / PAPERS / General