The sound pressure at near distance under free field was computed by using the wave number integration and the basic characteristics of the radiated noise were analyzes.

利用波数积分方法仿真计算了该模型在自由场条件下的近程声场，并分析了近场辐射噪声的基本规律。

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Free field to Eardrum Transfer Function (FETF) is one of the major factors influencing the identification of the sound source direction.

自由声场至耳膜的传递函数(FETF)被认为是影响辨别声源方向的主要因素之一。

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This paper describes the principle, construction and experimental results of the standard apparatus for underwater sound pressure by using the free-field reciprocity method.

本文叙述自由场互易法水声声压标准装置的原理、组成和实验结果。

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