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            <title xml:lang="en">Coupled Speakers As An Improved Omnidirectional Sound Source For Architectural Acoustics Measurements</title>
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                <forename type="first">Bartlomiej</forename>
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                <forename type="first">Artur</forename>
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                <forename>Claude</forename>
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                <title xml:lang="en">Coupled Speakers As An Improved Omnidirectional Sound Source For Architectural Acoustics Measurements</title>
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                    <forename type="first">Bartlomiej</forename>
                    <surname>Chojnacki</surname>
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                    <forename type="first">Tadeusz</forename>
                    <surname>Kamisinski</surname>
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                  <idno type="halauthorid">2214133-0</idno>
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                  <persName>
                    <forename type="first">Artur</forename>
                    <surname>Flach</surname>
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                  <idno type="halauthorid">2214134-0</idno>
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                <idno type="localRef">Measurement and uncertainty in room acoustics</idno>
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                  <title>Forum Acusticum</title>
                  <date type="start">2020-12-07</date>
                  <date type="end">2020-12-11</date>
                  <settlement>Lyon</settlement>
                  <country key="FR">France</country>
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                  <date type="datePub">2020</date>
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                <term xml:lang="en">ISO 3382</term>
                <term xml:lang="en">ISO 354</term>
                <term xml:lang="en">directivity measurements</term>
                <term xml:lang="en">measurements uncertainty</term>
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              <p>Omnidirectional sound source is important device in acoustic measurements according to standards ISO 354, ISO 3382 or ISO 140. In current state of the art we can found papers (Ingo 2005, San martin 2008, Knuttel 2013) showing the impact of not-ideal omnidirectional character of the sound source and its impact on parameters measured in room acoustics investigation. Obtained results of acoustic parameters, such as C80, D50 can differ by few orders of JND regarding the source rotation on the stand, changing the direction which is faced by loudspeakers in standard dodecahedral source. In this paper we propose new type of the omnidirectional sound source based on coupled speakers. Proposed device contain two electrodynamic loudspeakers in closed enclosure. Using this solution we receive omnidirectional spatial response with only two speakers, the effect of source rotation is greatly limited. The research present directivity patterns of proposed solution and sample room acoustic measurements to investigate the influence of source directivity on received results. Results comparison with previous research findings will be discussed to review new type of the source improved impact on room acoustic measurements. Author Bartlomiej Chojnacki has been partly supported by the EU Project POWR.03.03.00-IP.08-00-P13/18 - PROM NAWA</p>
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          <orgName>AGH University of Science and Technology [Krakow, PL]</orgName>
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          <date type="start">1912</date>
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              <addrLine>al. Mickiewicza 30, 30-059 Krakow, Poland</addrLine>
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