Lombard effect – NTi Audio TalkBox User Manual
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Lombard Effect
At increasing environmental noise the human persons speaking into the micro-
phone at PA systems gradually increase the sound pressure level of their speech.
The standardized speaking level is 60 dBA. Our ears recognize a speaking level in-
crease of 10 dBA as subjective double sound pressure level. To verify the PA system
operating in good order at this physical effect, the following shall be carried out:
Follow the prior described measurement procedure, using the STIPA test
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signal with 60 dBA @ 1m.
Select the STIPA test signal with 70 dBA @ 1m and verify the operation of the
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PA system; no clipping shall occur.