Bruker Biospin Ag

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Werner H Tschopp

A method for operating a magnetic resonance spectrometer with a digital filter whose input is fed with an NMR signal of a time length T, and whose output signal consists of a rising oscillation Bof a length T, a signal portion [F]' which consists of a filtered FID or echo signal of the length Tand a decaying oscillation Bof a length T, wherein this output signal is initially modified using a calculation process RV, and is subsequently transformed by Fourier transformation to a desired NMR spectrum, is characterized in that, during the calculation process RV, only the signal portion [F]&#x2032; is initially selected, at least N copies of the rising oscillation Bare subsequently generated in positive time shifts Twith respect to each other and are positioned on the signal portion [F&#x2032;] in time such that the end of the first rising oscillation is positioned at the end of the signal portion, at least N copies of the decaying oscillation Bare generated in negative shifts Tand are positioned on the signal portion [F&#x2032;] in time such that the start of the first decaying oscillation is positioned at the start of the signal portion [F&#x2032;], and all N copies of the rising oscillation Bdefined in this manner and N copies of the decaying oscillation Bdefined in this manner are added to the signal portion [F&#x2032;], and only the range Tthereof which contains the signal portion [F&#x2032;] is selected as resulting signal F&#x2033; of the calculation process RV, wherein the number N is to be calculated using the formula N=T/Tand rounded to the next higher integer number. This exactly compensates for the influence of the group delay time of digital, linear-phased filters in a mathematically exact manner.

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Uznach, Switzerland

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