Granqvist Svec PEVoC6 Microphones

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    Microphones and Room Acoustics and Their Influence on

    Voice Signals

    Svante Granqvist 1, Jan vec !

    1 "epartment of Speech, Music and #earing $TM#%, Ro&al Institute ofTechnolog& $'T#%, Stoc(holm, S)eden

    ! Groningen Voice Research *a+, "epartment of iomedical-ngineering, .niversit& of Groningen, The /etherlands

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    Microphone directivit&

    0 T)o common directivit& patterns 3 4mnidirectional

    0 ic(s up sound from all directions

     3 5ardioid0 Mainl& pics up sound from the front of the

    microphone6 good for suppression of am+ientnoise and rever+erant sound

    04mnidirectional is preferra+le unlessam+ient sound is a pro+lem

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    Microphonerecommendations

    0

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    S* cali+rationcali+rator 

    0  A cali+rator is a device that isattached to the microphoneand generates a )ell8defined

    S* $usuall& >? d, 1(#9%0 Standard for measurementmicrophones

    0 Ma(e sure the cali+rator fits

    tight on the microphone0 /ever, ever use it fordirectional microphones@

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    S* cali+rationloudspea(er level meter 

    0 Generate a test tone )itha loudspea(er or use asustained vo)el

    0 The level at themicrophone is measured+& a level meter close to

    the microphone

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    S* cali+ration*evel meter at =7 cm,

    mic at mouth0 5an +e used for

    headmounted

    microphones0  Automaticall& accounts

    for the short distance

    +et)een mic and mouth0 Results in cali+ration asif  level had +eenmeasured at =7 cm

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    S* cali+rationRecommendations

    0 Ta(e the time to do level cali+rations@

    0  A simple cali+ration )ith the voice and alevel meter is often enough

    0 5ali+ration is not difficult, still it often goes)rong 3 'e&s to successful cali+rationB

    0 Verification

    0 -;perience 2 esta+lisment of a standard procedure

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    Room acoustics

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    Than( &ou@