| 摘要 |
PURPOSE:To remove a dummy signal after complex Fourier transformation by eliminating frequency characteristics between receiver systems, by providing a digital filter for performing the limitation of a band zone upon the reception of the output signal from an AD converter of a FID signal. CONSTITUTION:The FID signal from a probe 2 is inputted through a high frequency amplifier 6 and phase detectors 8, 12 to be converted to low frequency signals different by 90 deg. in a phase while said low frequency signals are inputted to low frequency amplifiers 9, 13 and AD converters 11, 15 and the sampling times thereof are controlled by a sampling timer 19. Digital data of both systems are successively stored in the memory within an integrator 20 through a multiplexer 16. When taking-in is completed, the timer 19 is stopped by the stop order from the integrator 20 and a signal is sent to CPU18. A digital filter 21 receives the operation parameter from CPU18 and the measured data from the integrator 20 to perform predetermined filter operation. By this mechanism, the difference of frequency characteristics between both receiver systems is reduced and the generation of a dummy signal after complex Fourier transformation is prevented. |
