Noise reduction by dynamic signal preemphasis

被引:5
作者
Takeda, Kazuyuki [1 ]
Takegoshi, K. [1 ]
机构
[1] Kyoto Univ, Grad Sch Sci, Div Chem, Kyoto 6068502, Japan
基金
日本科学技术振兴机构;
关键词
Noise reduction; Dynamic range; Digitization noise; Preemphasis; Apodization; MULTIDIMENSIONAL NMR; SPECTROSCOPY; RESOLUTION; MRI;
D O I
10.1016/j.jmr.2010.11.017
中图分类号
Q5 [生物化学];
学科分类号
071010 ; 081704 ;
摘要
In this work we propose an approach to reduce the digitization noise for a given dynamic range, i.e., the number of bits, of an analog to digital converter used in an NMR receiver. In this approach, the receiver gain is dynamically increased so that the free induction decay is recorded in such an emphasized way that the decaying signal is digitized using as many number of bits as possible, and at the stage of data processing, the original signal profile is restored by applying the apodization that compensates the effect of the preemphasis. This approach, which we call APodization after Receiver gain InCrement during Ongoing sequence with Time (APRICOT), is performed in a solid-state system containing a pair of (13)C spins, one of which is fully isotopically labeled and the other is naturally abundant. It is demonstrated that the exceedingly smaller peak buried in the digitization noise in the conventional approach can be revealed by employing APRICOT. (C) 2010 Elsevier Inc. All rights reserved.
引用
收藏
页码:305 / 308
页数:4
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