| 摘要 |
PROBLEM TO BE SOLVED: To enable a received signal to be sampled without using a very fast AD converter in a magnetic resonance measurement device such as an NMR measurement device, and when an RF frequency is low, to enable the sampling suitable for that to be performed.SOLUTION: When the frequency (RF) of observation nucleus belongs to a high-frequency band 122, an RF reception signal is converted to an intermediate-frequency signal, and the converted signal is inputted to an AD converter. In this case, under-sampling is executed on the intermediate-frequency signal in the AD converter, and the secondary loopback signal component of a target signal component is observed. On the other hand, when the frequency (RF) of the observation nucleus belongs to a low-frequency band 120, the RF reception signal is inputted to the AD converter directly as is, and over-sampling is executed on the RF reception signal, the target signal component itself being observed.SELECTED DRAWING: Figure 4 |
