In this paper, a method of measuring the input mechanical impedance of the array element (longitudinal vibrating transducer) with square radiation head by using impulse sound tube is proposed.

本文提出了以声脉冲管测量辐射头为方形的一种阵元(纵向振动换能器)的输入力阻抗的方法。

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The effects on the underwater sound attenuation by the thickness and concentration gradient of polymers were measured in a sound tube at different frequency during the polymers dissolution process.

文中详细研究了梯度高分子溶液在不同频率下，聚合物厚度及梯度结构的变化对反射声衰减效果的影响。

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Fans cooling the transmitter wailed with a sound like a high-powered leaf blower — and the thermometer inside the tube began to climb.

冷却发射机的风扇嗡嗡地响着—试管里的温度开始上升了。

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When sound waves enter the tube, the vibration of the droplets will cause the sensor to detect changes optically as the beam is disturbed, supposedly resulting in near-perfect vocal reproduction.

ENGADGET: Inventor patents laser microphone

Samsung's Vacuum Tube Soundbar (model HW-F750) resolves consumers' desire for pure power and warm, natural sound by integrating a vacuum tube amplifier into a soundbar for the first time.

ENGADGET: Samsung introduces its CES audio hardware, claims a world first

Samsung's Vacuum Tube Soundbar (model HW-F750) is the first soundbar to feature a built-in vacuum tube to maximize sound quality, and is the world's first soundbar that can wirelessly connect with a TV via Bluetooth.

ENGADGET: Samsung introduces its CES audio hardware, claims a world first