2) IF sampling
中频直接采样
1.
After analyzing the principle and difficulties of analog QPD receiver, the article introduces the principle of digital QFD, oversampling and IF sampling, and the implement of digital receiver on MSL 400 spectrometer.
本文在分析模拟正交检波原理与不足的基础上 ,介绍了数字正交检波、过采样和采用中频直接采样的原理 ,及在 40 0MHz核磁谱仪上的实现方案 。
3) direct band-pass sampling on intermediate frequency
中频直接带通采样
4) direct RF sampling
直接射频采样
1.
The design and construction of a digital receiver for low-field MRI scanner based on direct RF sampling is described.
它基于直接射频采样技术,本文详细讨论了其设计过程。
5) direct sampling
直接采样
1.
The results show that,in comparison with direct sampling,the pre-vacuum sampling can dramatically decrease gas sampling volume,shorten sampling time,and minish the difference of gas sample and the source,and thus improve sampling precision.
为了提高农田温室气体自动采样精度,该文比较了田间自动连续测定系统观测温室气体通量过程中实际管道直接采样与预抽真空采样的差异,结果表明:管道预抽真空采样能显著减少分析时的样品量,缩短采样时间和减小采集气样与源气样的差异,提高了采样的精度。
2.
Direct sampling microwave radiometer(DSMR) is a digital radiometer of simple structure,which directly samples radio frequency signals.
直接采样微波辐射计对射频信号直接采样,是一种结构简单的数字辐射计。
补充资料：直接
不经过中间事物的。与“间接”相对：直接取用｜直接关系。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条