声回波对消中，双端语音检测用以判定远端语音是否混和有近端语音。
Doubletalk detection(DTD) is used to sense whether the far-end speech is corrupted by the near-end speech in echo cancellation.
近20年来，超声成像设备在电脑超声成像技术，谐波成像技术，相干处理成像技术，多普勒频移成像技术，回波频谱分析技术等方面取得了重大进展。
In the past 20 years, the imaging technique of ultrasound imaging equipment has made much progress in harmonic imaging, coherent imaging, Doppler imaging and frequency spectra analysis.
强回波区的降水会在近地面产生出流。
而地表的辐射冷却，对近地层逆温的影响，表现为较强的回波强度峰值，对应气温变化的谷值。
That the surface's radiation cooling affects on the ground layer temperature inversion is presented as the relatively strong echo peak value corresponding to the temperature variety's valley value.
而地表的辐射冷却，对近地层逆温的影响，表现为较强的回波强度峰值，对应气温变化的谷值。
That the surface's radiation cooling affects on the ground layer temperature inversion is presented as the relatively strong echo peak value corresponding to the temperature variety's valley value.
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