英德
有道
百度
谷歌
图片
维基
百科
变焦距
varifocal
- 其它改进包括：增加一套彩色变焦距摄像机；控制、视频回路分别采用不同频带；新型天线；更符合人机工程的手动控制器以及白天易读的显示器。
Other enhancements include the addition of a color zoom camera, adoption of a different frequency band for the control/video link, a new antenna, a more ergonomic handheld controller, a daylight-readable display. - 摘要为了在超声检测中排除噪声干扰，从强噪声背景中提取弱回波信号，利用小波变换技术从超声探测信号中提取弱缺陷回波信号，建立了超声缺陷回波的数学模型，并进行了仿真实验，其特有的“变焦距”特性使得小波分析在时域和频域中具有良好的分析能力。
In order to suppress noises and extract weak echoes from signals with high noise background, wavelet transform technology was used for extracting weak flaw echoes from ultrasonic detection signal, and at the same time the mathematical model of ultrasonic detection flaw echoes was established and simulation experiments were done.
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