The spectrum of radiated noise from ships consists of a continuous broadband spectrum and a discrete narrow-bandline-spectrum.
船舶辐射噪声的功率谱由连续的宽带谱和离散窄带线谱组成。
2
Experiments on simultaneous mask effect where tones were masked by narrow-band noises with different SPL showed that the masking curve could be approximated as two segments of straight line.
不同声压级下窄带噪声对纯音同时掩蔽效应的实验结果表明：掩蔽曲线可以用两段直线来近似。
3
The narrow-band system used for on-line partial discharge monitoring has been developed in this paper.