resample 方法更多的应用场合是 freq 发生改变的时候，这时操作就分为升采样（upsampling）和降采样（downsampling）两种。具体的区别都体现在参数里。
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数字锁相放大器的实现研究 - 模拟设计 - 优领域 - 在优领域，找到您想要的！ 关键词：锁相放大器；采样率；积分梳状滤波器；降采样 [gap=824]Keywords：digital lock-in amplifier；sample frequency；CIC；decimation
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The seismic signal was processed by down-sampling and noise reduction, and the eigenvector was extracted with the wavelet packet.
通过对信号进行降采样、去噪等预处理，利用小波包分解提取信号特征量。
参考来源 - 光纤传感系统中关键问题的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
比较了方位向预滤波降采样方法与子孔径处理方法各自的优缺点。
The advantage and disadvantage of the method of azimuth pre-filtering and undersampling and the method of subaperture processing are compared.
在此基础上，本文着重从空间降采样解码与时间降采样解码两方面对降采样解码处理技术进行研究。
On this basis, this paper focuses on two approaches of down-conversion decoding: spatial down-conversion decoding and temporal down-conversion decoding.
用传统MR图像重建方法对降采样数据进行重建往往会产生严重的伪影或导致重建图像的信噪比下降。
Reconstructing MR images from under-sampled measurement data using traditional reconstruction methods usually results in image artifacts and low signal to noise ratio.
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