In an NMR apparatus having an analog-to-digital converter for converting
the voltage signal V(t) to a digital signal, a reference signal generator
for generating reference waves which are digital signals, and a
quadrature detector for performing a quadrature detection operation, a
detection controller for changing a frequency of or of the reference
waves or a time interval of A which is a time interval between data
points of digitized NMR signals and also a time interval between data
points of the reference waves during detection is installed and
furthermore, a storage device for preserving the voltage signal V(t)
converted to a digital amount at least until the quadrature detector or
the reference signal generator changes the frequency or of the reference
waves or the time interval A is installed between the analog-digital
converter and the quadrature detector.
