| 摘要 |
PROBLEM TO BE SOLVED: To provide a user-friendly acoustic calibrator by reducing the height without lowering calibration accuracy, and making the calibrator into form stable for calibration work. SOLUTION: In the acoustic calibrator in which a pressure type microphone 8 is inserted into a coupler 7 and the sensitivity of the pressure type microphone 8 is calibrated by generation a calibration sound inside the coupler 7 by means of an electromagnetic type earphone 6, a signal for minimizing the waveform distortion of the calibration sound generated by the electromagnetic type earphone 6 is supplied to the electromagnetic type earphone 6.
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