Information transfer is effected using a network of electrical signal
conductors and sensors forming crosspoint connections. The sensors are
capable of representing a measurement parameter as an electrical
impedance. One embodiment of the present invention includes output
electrical conductors, input electrical conductors, and sensors. Each of
the sensors is connected with one of the output electrical conductors and
one of the input electrical conductors so as to form an array of
crosspoint connections. Application of electrical signals to the sensors
and measurement of electrical signals from the sensors provide sufficient
information to derive relative information corrected for parasitic current
sources for each sensor using algorithms based on equations for combining
impedance. The embodiment may further include one or more reference
elements connected with the output electrical conductors and with the
input electrical conductors so as to form crosspoint connections. The
reference elements have predetermined impedances and may be used to
determine the impedance values for particular sensors.
