DC rejection and deblocking in multichannel bioelectric recordings

Multichannel instrumentation for the recording of bioelectric events should have provisions to reject the relatively large DC voltages which are produced by the electrodes involved. Active DC rejection is a suitable high pass filtering technique preserving the common mode rejection ratio of the preamplifiers. High pass filtering may lead to very slow responses of the instrumentation after overload, which can be handled by deblocking. A method to use the DC information of the rejected signal in a multichannel system is presented