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。
2
This speciality standard will give a go-ahead for using as the reference of the cold and room-temperature microwave noisestandard source below 3dB ultra-low-noise received system.