通过直管噪声与带消声器的尾管声压级的对比，发现在低频段有一峰值。
We make a comparison in tailpipe noise between straight pipe and muffler, it is seen that there is a sharp peak in low frequent.
介绍一种用于水声材料低频声性能测量的驻波管测试系统。
A standing wave tube measurement system is presented for measuring low frequency acoustic properties of underwater acoustic materials.
目前有关晶体管低频噪声测量仪器普遍存在的问题是测量误差大、时间长、所给噪声参数不完善。
Nowdays the problems commonly existing in the measurement of low frequency noise of transistors are, great errors, long time and imperfection of noise parameters.
PNP外延硅晶体管。低频功率放大器。
PNP epitaxial silicon transistor. Low frequency power amplifier.
同时求解了采用该乳胶管弹簧下的超低频标准振动台的运动方程近似解，得到了波形失真度计算式。
The formula of waveform distortion is obtained by the approximate result expression of nonlinear equation about ultra low frequency standard vibrator with this kind of emulsion pipe spring.
第六章研究了高阶统计量在晶体管低频噪声检测中的应用。
In chapter six, the application of higher order statistics in detection low-frequency noise of transistor is discussed.
针对小口径火炮身管钻削加工时存在的切屑堵塞和内膛质量问题，设计了一套低频振动装置。
According to the problems of blocked chips and hole qualities in the drilling of small caliber gun barrel, a installation of low-frequency vibration drilling is designed.
斜管开裂的主要原因是温度场下的低频应力疲劳破坏。
The main reason of inclined pipe fracture was low frequency stress fatigue failure at temperature field.
本文中描述用振幅峰值的方法，测量面接触型晶体管OC70，OC71和点接触型晶体管2N32A内窄频带低频率噪声的振幅分布。
The amplitude distribution of narrow hand semiconductor noise in junction type OC70, OC71 and point contact type 2N32A transistors were measured experimentally by the "maximum amplitude" method.
本计划以大功率管MOS管为核心原件，采用分立元件与集成运放相连合计划出的低频功率放大器。
The design for high-power MOS tube as the core original pipe, using discrete components and integrated operational amplifier combines the low-frequency power amplifier design.
在2080功能低音反射通过双端口提供最佳的低频率调谐管调整，提高从这个高品质的外壳已经大幅低音输出。
The 2080 features bass-reflex tuning through twin port tubes providing optimal low-frequency tuning, enhancing the already substantial bass output from this high quality enclosure.
在2080功能低音反射通过双端口提供最佳的低频率调谐管调整，提高从这个高品质的外壳已经大幅低音输出。
The 2080 features bass-reflex tuning through twin port tubes providing optimal low-frequency tuning, enhancing the already substantial bass output from this high quality enclosure.
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