| Definition: | of a microphone, for a specified frequency, quotient of the output open-circuit voltage by the sound pressure, at the position previously occupied by the microphone reference point, in the undisturbed sound field produced by a human head and mouth, or by a specified source that simulates the acoustical characteristics of a human head and mouth
NOTE 1 – If the load impedance is other than that of an open circuit, it shall be specified.
NOTE 2 – This definition is relevant only to microphones used close to the mouth.
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