The acoustic character controlled by the active noise attenuation system in ducts has been analyzed in detail on premise of semi-infinite ducts.
在假设半无限长管道的前提下，详细分析了噪声有源控制系统作用下的管道声场特性。
2
The study on the holographic reconstruction and prediction of a semi-free field is valuable for the practical applications of the acoustic holography technique.
半自由声场环境下的声源重建和声场预测研究对声全息技术走向实际应用具有非常重要的意义。
3
Therefore, the research on the acoustic field reconstruction in semi-space is very important for its use in practical conditions.