Active equalisation of the sound field in an extended region of a room

Arturo Orozco-Santillán

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    Abstract

    A theoretical study of spatial sound equalisation in an extended region in a room has been carried out. The purpose is to reproduce sound without significant spatial fluctuations and to minimise the spectral colouration at low frequencies in a specified region of the room. The problem is first studied by means of an idealised frequency domain model. The analysis is based on the calculation of the complex source strengths that minimise the difference between the actual sound pressure and the desired sound pressure in the listening area. Results in relation to the position of the sources, the frequency range, and the size and location of the listening area are presented. However, the frequency-domain approach results in non-causal impulse responses that can be realised only at the expense of a delay. Therefore, this analysis is supplemented with a study of the equalisation carried out in the time domain. Here, a solution constrained to causality is determined. The duration of the impulse response should be minimised as well in order to avoid echos, which are undesirable in the reproduction of transient signals. This causality-constrained equalisation is compared with the optimal solution obtained in the frequency domain.
    Original languageEnglish
    Title of host publicationProceedings of the Fifth International Congress on Sound and Vibration
    Place of PublicationAuburn, AL
    PublisherThe International Institute of Acoustics and Vibration
    Publication date1997
    Pages287-294
    Publication statusPublished - 1997
    Event5th International Congress on Sound and Vibration - Adelaide, Australia
    Duration: 15 Dec 199718 Dec 1997
    Conference number: 5

    Conference

    Conference5th International Congress on Sound and Vibration
    Number5
    CountryAustralia
    CityAdelaide
    Period15/12/199718/12/1997

    Cite this

    Orozco-Santillán, A. (1997). Active equalisation of the sound field in an extended region of a room. In Proceedings of the Fifth International Congress on Sound and Vibration (pp. 287-294). Auburn, AL: The International Institute of Acoustics and Vibration.
    Orozco-Santillán, Arturo. / Active equalisation of the sound field in an extended region of a room. Proceedings of the Fifth International Congress on Sound and Vibration. Auburn, AL : The International Institute of Acoustics and Vibration, 1997. pp. 287-294
    @inproceedings{8626a0bdc67f42d9aaf9a4860756a5d1,
    title = "Active equalisation of the sound field in an extended region of a room",
    abstract = "A theoretical study of spatial sound equalisation in an extended region in a room has been carried out. The purpose is to reproduce sound without significant spatial fluctuations and to minimise the spectral colouration at low frequencies in a specified region of the room. The problem is first studied by means of an idealised frequency domain model. The analysis is based on the calculation of the complex source strengths that minimise the difference between the actual sound pressure and the desired sound pressure in the listening area. Results in relation to the position of the sources, the frequency range, and the size and location of the listening area are presented. However, the frequency-domain approach results in non-causal impulse responses that can be realised only at the expense of a delay. Therefore, this analysis is supplemented with a study of the equalisation carried out in the time domain. Here, a solution constrained to causality is determined. The duration of the impulse response should be minimised as well in order to avoid echos, which are undesirable in the reproduction of transient signals. This causality-constrained equalisation is compared with the optimal solution obtained in the frequency domain.",
    author = "Arturo Orozco-Santill{\'a}n",
    year = "1997",
    language = "English",
    pages = "287--294",
    booktitle = "Proceedings of the Fifth International Congress on Sound and Vibration",
    publisher = "The International Institute of Acoustics and Vibration",

    }

    Orozco-Santillán, A 1997, Active equalisation of the sound field in an extended region of a room. in Proceedings of the Fifth International Congress on Sound and Vibration. The International Institute of Acoustics and Vibration, Auburn, AL, pp. 287-294, 5th International Congress on Sound and Vibration, Adelaide, Australia, 15/12/1997.

    Active equalisation of the sound field in an extended region of a room. / Orozco-Santillán, Arturo.

    Proceedings of the Fifth International Congress on Sound and Vibration. Auburn, AL : The International Institute of Acoustics and Vibration, 1997. p. 287-294.

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

    TY - GEN

    T1 - Active equalisation of the sound field in an extended region of a room

    AU - Orozco-Santillán, Arturo

    PY - 1997

    Y1 - 1997

    N2 - A theoretical study of spatial sound equalisation in an extended region in a room has been carried out. The purpose is to reproduce sound without significant spatial fluctuations and to minimise the spectral colouration at low frequencies in a specified region of the room. The problem is first studied by means of an idealised frequency domain model. The analysis is based on the calculation of the complex source strengths that minimise the difference between the actual sound pressure and the desired sound pressure in the listening area. Results in relation to the position of the sources, the frequency range, and the size and location of the listening area are presented. However, the frequency-domain approach results in non-causal impulse responses that can be realised only at the expense of a delay. Therefore, this analysis is supplemented with a study of the equalisation carried out in the time domain. Here, a solution constrained to causality is determined. The duration of the impulse response should be minimised as well in order to avoid echos, which are undesirable in the reproduction of transient signals. This causality-constrained equalisation is compared with the optimal solution obtained in the frequency domain.

    AB - A theoretical study of spatial sound equalisation in an extended region in a room has been carried out. The purpose is to reproduce sound without significant spatial fluctuations and to minimise the spectral colouration at low frequencies in a specified region of the room. The problem is first studied by means of an idealised frequency domain model. The analysis is based on the calculation of the complex source strengths that minimise the difference between the actual sound pressure and the desired sound pressure in the listening area. Results in relation to the position of the sources, the frequency range, and the size and location of the listening area are presented. However, the frequency-domain approach results in non-causal impulse responses that can be realised only at the expense of a delay. Therefore, this analysis is supplemented with a study of the equalisation carried out in the time domain. Here, a solution constrained to causality is determined. The duration of the impulse response should be minimised as well in order to avoid echos, which are undesirable in the reproduction of transient signals. This causality-constrained equalisation is compared with the optimal solution obtained in the frequency domain.

    M3 - Article in proceedings

    SP - 287

    EP - 294

    BT - Proceedings of the Fifth International Congress on Sound and Vibration

    PB - The International Institute of Acoustics and Vibration

    CY - Auburn, AL

    ER -

    Orozco-Santillán A. Active equalisation of the sound field in an extended region of a room. In Proceedings of the Fifth International Congress on Sound and Vibration. Auburn, AL: The International Institute of Acoustics and Vibration. 1997. p. 287-294