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8/9/2019 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@