Essentially, ping sends an echo packet to the device, and expects the device to echo the packet contents back.
简单地说，ping向设备发送一个echo数据包，期望设备把数据包的内容发送回来。
Multi-Beam Echo Sounder is an absolutely necessary seafloor mapping device with high accuracy and high efficient at 21st century. It is much fitted to sweep mapping for wide area.
多波束测深仪是高精度、高效率的地形测绘设备，适合大面积的扫海测量作业，是21世纪水下地形测量必不可少的测绘仪器。
A device used underwater to produce pulses of sound, as for an echo sounder.
特殊设计的专用降噪消声装置的采用，极大的抑制了机械噪声。
The NLMS adaptive sound echo-counteracted algorithm is introduced in the paper. The hardware and software of the sound echo-counteracted device are realized by DSP.
介绍了自适应NL MS声回声抵消算法，并运用DSP对声回声抵消器进行软硬件实现。
The NLMS adaptive sound echo-counteracted algorithm is introduced in the paper. The hardware and software of the sound echo-counteracted device are realized by DSP.
介绍了自适应NL MS声回声抵消算法，并运用DSP对声回声抵消器进行软硬件实现。
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