It can be reduced sharply by pipe blowing silencer.
吹管噪声严重污染环境 ,使用吹管消声器能解决这一问题。
Acoustics--Measurement of insertion loss of ducted silencers without flow--Laboratory survey method
GB/T16405-1996声学管道消声器无气流状态下插入损失测量实验室简易法
a pipe carrying fumes from the muffler to the rear of a car.
一种从消声器中运到汽车尾部的管道。
Research on Experimental Measurement Technique for Acoustic Performance of Ducts and Silencers
管道和消声器声学性能的试验测量技术研究
The Contrast of Simple Expanded-muffler with Large Porosity Perforated Muffler
简单扩张式消声器与穿孔管消声器对比研究
Noise Analysis and Studying of Adaptive Noise Cancellation in Pipeline Detecting System;
管道检测系统噪声分析与自适应噪声抵消研究
I plant professional sound system automobile production products, including various types of noise on tailpipe and related products.
我厂专业生产汽车消声系统产品，包括各类消声器尾管及相关产品。
Numerical analysis of the effect of structural parameters on the acoustic attenuation performance of straight-through perforated tube silencers
结构参数对直通穿孔管消声器消声性能影响的数值分析
muffler for road motor vehicles (excl. motor cycles) or tractors
消声器,道路机动车辆（不包括摩托车）或拖拉机用
Development of Oil and Gas Pipeline Crack Detector Based on EMAT
天然气管道裂纹电磁超声检测器研制
A particular frog's calls were recorded on one channel, using a transistor-condenser microphone.
青蛙的叫声用晶体管传声器记录在一个频道上。
Study on Acoustic Transmission Loss in 4-channel Impedance Tube with Single-sensor
单传声器四通道驻波管隔声量的测试研究
sound attenuation
消声器（噪声衰减装置）
Research on Active Noise Control in Ducts Based on DSP Processor
管道噪声主动消除系统算法研究及DSP实现
Research on Pressure Loss and CFD Simulation of the Insert-pipe Resistance Mufflers
内插管抗性消声器的CFD仿真及压力损失研究
This method broadens the silence frequency bandwidth of muffler and improves its silence fuction.
这种方法拓宽了消声器的消声频带宽度,改善了消声器的消声性能。
air cleaner and silencer
空气净化器及消声器
A two-stage adaptive noise cancellation algorithm for ultrasonic nondestructive testing of oil pipeline is studied in this paper.
针对石油管道缺陷超声检测信号的噪声消除问题，研究了一种两级自适应噪声消除算法。
quadraphonic amplifier
四声道立体声放大器