In this paper a microwave standard noise source which produces noise by healing a metal filament is described.
本文介绍了一种用加热金属丝来产生噪声的微波标准噪声源。
After a white noise signal has been taken as the input of a standard sound source, a static acoustic test is conducted for a prototype silencer without air flow and at the normal temperature.
采用白噪声信号作为标准声源的输入信号，在常温无气流条件下对消声器实物模型进行了静态放声试验。
A full band WR28 matched load immersed in the liquid nitrogen is served as the noise radiation source of the standard.
一个全频带WR28匹配负载浸入液氮中作为该标准的噪声辐射源。
Now, in J, the excellent and good rate of atmospheric environment quality is 94% and environmental noise reaches the standard of function areas and the water quality of drinking water source is 100%.
目前全市空气环境质量优良率达到94%，环境噪声达到功能区标准，饮用水源水质达标率100%。
This speciality standard will give a go-ahead for using as the reference of the cold and room-temperature microwave noise standard source below 3dB ultra-low-noise received system.
本标准批准后即作为噪声系数3分贝以下低噪声精密测试时的“冷热源”专业技术标准。
This speciality standard will give a go-ahead for using as the reference of the cold and room-temperature microwave noise standard source below 3dB ultra-low-noise received system.
本标准批准后即作为噪声系数3分贝以下低噪声精密测试时的“冷热源”专业技术标准。
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