Results of identification and analysis show that main noise source of the model GZ6921 bus is cooling fan.
识别及分析结果表明，冷却风扇噪声是GZ 6921型客车的主要噪声源。
Through measurement and analysis of sound signals, the trouble source can be accurately detected and its type analyzed under strong noise environment.
通过检测及分析声音信号，可以在强噪声环境下准确地探测到故障源并分析出其故障类型。
In order to control the noise of the indoor unit of an embedded air conditioner, the main source of the noise is identified by using separate running and noise spectrum analysis.
为了控制内藏式空调室内机的噪声，运用分步运转、频谱分析等方法判断出主要噪声源。
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