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  • 1.
    Berg, Jan
    et al.
    Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, Medier ljudteknik och upplevelseproduktion och teater.
    Bustad, Christofer
    Sveriges Radio.
    Jonsson, Lars
    Sveriges Radio.
    Mossberg, Lars
    Sveriges Radio.
    Nyberg, Dan
    Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, Medier ljudteknik och upplevelseproduktion och teater.
    Perceived audio quality of realistic FM and DAB+ radio broadcasting systems2013Inngår i: A E S, ISSN 1549-4950, Vol. 61, nr 10, s. 755-777Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The perceived audio quality of a digital broadcasting system such as DAB+ is dependent on what type of coding and bit rates are applied. Due to bandwidth constraints, audio quality is prone to be in conflict with other service demands such as the number of channels and the transfer of ancillary data. Compared to DAB+, several other audio services have superior bit rates that challenge the audio quality of DAB+. This paper reviews audio-quality criteria and investigates how the perceived audio quality of different broadcasting systems complies with the criteria. Two studies were conducted: Test 1 where DAB+ codecs were tested at bit rates between 96 and 192 kbit/s and Test 2 where DAB+ systems between 48 and 192 kbit/s as well as FM systems were tested. The systems in Test 2 were designed to as far as possible model a realistic broadcasting signal chain including commonly used dynamic processors. The studies were realized through two listening experiments using the ITU-R recommendations BS.1116 and BS.1534 (MUSHRA) followed by a closing interview. The results showed that the currently highest available subchannel bit rate for DAB+ (192 kbit/s) was insufficient for attaining perceptually transparent quality for critical items, whereas it enabled a quality comparable to or in some instances better than a modern FM system. Extrapolation of data indicates that critical items may need to be coded at even higher bit rates to reach perceptually transparent quality. From the interviews, auditory features important for the subjects’ assessment of quality were observed. This study concludes that when making decisions on broadcasting systems, it is important to have well-founded and clearly defined criteria for minimum acceptable quality and/or perceptually transparent quality.

  • 2.
    Berg, Jan
    et al.
    Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, Medier ljudteknik och upplevelseproduktion och teater.
    Nyberg, Dan
    Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, Medier ljudteknik och upplevelseproduktion och teater.
    A qualitative approach to evaluation of perceived qualities of audio and video in a distance education context2014Inngår i: Acta Acoustica united with Acustica, ISSN 1610-1928, E-ISSN 1861-9959, Vol. 100, nr 1, s. 154-165Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This study presents a qualitative method for collecting and analysing data to describe audio and video quality. Used in the social sciences, arts, and humanities, this approach relies on phenomenology and hermeneutics and uses interviews and questionnaires to assess the audio and video quality of master classes in classical music taught via the Internet. Although this study is only exploratory, it provides evidence that the method could successfully be used to gather descriptions of perceived qualities.

  • 3.
    Berg, Jan
    et al.
    Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, Medier ljudteknik och upplevelseproduktion och teater.
    Nyberg, Dan
    Listener envelopment: what has been done and what future research is needed?2008Inngår i: 124th Audio Engineering Society Convention 2008: Audio Engineering Society Convention Papers, Curran Associates, Inc., 2008, artikkel-id 7379Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In concert hall acoustics, the perceived spatial impression and/or spaciousness are characterized by the two attributesapparent source width (ASW) and listener envelopment (LEV). For LEV there are no clear consensus across theresults of previous work. This paper aims to discuss the research performed on LEV and how these research resultsare confirming or contradicting each other. There is a consensus on the arrival angle of the later sound energy and itsinfluence on LEV, whereas there is no clear agreement on the delay time and frequency content of the latereflections.

  • 4.
    Nyberg, Dan
    Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, Medier ljudteknik och upplevelseproduktion och teater.
    Activity: Distance Learning2011Konferansepaper (Annet (populærvitenskap, debatt, mm))
  • 5.
    Nyberg, Dan
    Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, Medier ljudteknik och upplevelseproduktion och teater.
    An investigation of qualitative research methodology for perceptual audio evaluation2012Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This thesis investigates whether a qualitative research method, using phenomenological interviews and analysis, can be successfully applied to perceptual audio research, a field heretofore that has mainly used quantitative methods. The method is investigated by studying the types of information elicited by the method and the information’s usefulness and relevance to the conducted study. The qualitative method is applied in three different conditions: a non-experimental condition, an experimental condition, and an experimental condition using mixed-methods. The thesis also identifies implications associated with using a qualitative method in a quantitative field of research, implications that researchers should acknowledge and consider. All scientific criteria in which the quantitative research is judged cannot directly be applied to a qualitative method. A qualitative method has to be judged on its own framework, departure points, and scientific criteria. The information elicited from the qualitative method contains information that supports known knowledge and adds new knowledge. It supplements the accessibility to the subjects’ perceptions and used methods when conducting a perceptual evaluation task. In conclusion, a qualitative research method that consists of phenomenological interviews and analyses can be successfully applied in all the tested conditions.

  • 6.
    Nyberg, Dan ()
    Luleå tekniska universitet, Institutionen för konst, kommunikation och lärande, Medier ljudteknik och upplevelseproduktion och teater.
    Guitarra Negra for Guitar and Sextet2011Kunstnerisk output (Ogranskad)
    Abstract [sv]

    Låt på skivan "Guitarra Negra" av Sebastián Caldas Zabellos Spår 17, tonsättare Sara Varas

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