Patent ID: 8639329
Filing Date: 2014-01-28
Classification: A61B,A61N,G01N

Abstract:
1. Apparatus comprising: excitation circuitry that electrically excites a physical system by way of applying an excitation signal to a physical interface to the system; and signal acquisition circuitry that actively eliminates interference arising from the excitation signal, said signal acquisition circuitry comprises a recording amplifier in a discharge feedback loop that incorporates the physical interface, the discharge feedback loop further comprising a discharge amplifier configured to directly provide an electrical discharge path for the physical interface, wherein said discharge feedback loop eliminates interference arising from the excitation of the physical system by a continuous-time adjustment of an electrical characteristic of the physical interface toward a target state prior to a subsequent excitation signal being applied by the excitation circuitry, wherein said adjustment of the electrical characteristic is a function of a present condition and a pre-excitation condition of the physical interface.