Because normally the electro-acoustic equipment, technical specifications are given quasi-average noise level, rather than quasi-peak noise level, this should be noted.

因为通常电声设备技术指标给出的是噪声准平均值电平，而不是噪声准峰值电平，这一点应加以注意。

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Results showed that the research under the concept of the acoustic mode is significant in the efforts of reducing the noise level of ships.

结果表明，研究结构在声辐射模态概念下的噪声特性是船舶降噪研究中的一条新途径。

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The key to reduce the internal noise level is that we should estimate the acoustic field accurately and then go on low noise optimization design to body structure during the course of designing.

降低车辆内部的噪声的关键是在设计阶段要准确预估车内声场特性进而对车身结构进行低噪声优化设计。

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The premium X Headphones were engineered with an enhanced acoustic configuration for a high level of noise isolation and exceptional bass response.

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The MDR-XB60EX in-ear headphones were engineered with a unique acoustic design for a high level of noise isolation and exceptional bass response.

ENGADGET: Sony ships new Extra Bass headphone lineup to the US, delivers that Direct Vibe to your brain