Brinkmann K, Richter U
Physikalisch-Technische Bundesanstalt, Braunschweig, Federal Republic of Germany.
Scand Audiol. 1989;18(2):75-81. doi: 10.3109/01050398909070726.
Speech audiometric test results strongly depend on the frequency response of the equipment used for speech transmission. For the comparison of data measured with different kinds of acoustic transducers, e.g. earphones and loudspeakers, a common reference basis for the specification of the frequency response of speech audiometers is therefore needed. The most obvious basis is the free sound field. In order to provide data for earphone specification in terms of the equivalent free-field response, which are to be included in an IEC standard on speech audiometers under preparation, comprehensive loudness comparison measurements with free progressive sound waves were performed on various audiometric earphones. When these data are used, calibration and testing of speech audiometers are as simple as in the case of puretone audiometers.
言语测听测试结果在很大程度上取决于用于言语传输的设备的频率响应。因此，为了比较使用不同类型声学换能器（如耳机和扬声器）测得的数据，需要一个通用的参考基准来规定言语听力计的频率响应。最明显的基准是自由声场。为了提供根据等效自由场响应来规定耳机的相关数据，这些数据将被纳入正在制定的关于言语听力计的国际电工委员会（IEC）标准中，我们对各种测听耳机进行了自由行波的综合响度比较测量。当使用这些数据时，言语听力计的校准和测试就如同纯音听力计一样简单。
