Myoelectrical activities of the stomach
that is recorded noninvasively from
electrodes on the abdomen are usually termed
EGG. We designed a preamplifier, a fifthorder
low-pass filter with a gain of 20, and a
variable-gain amplifier. The EGG signals
were digitized by a 8-bit A/D coverter and
then analyzed in the frequency domain. This
system is helpful for EGG recording.
