A Multiplexing System for Multichannel Signal Averaging of the Visual Evoked Response
James P. Ary, Terry L. Fry, William R. Biersdorf · IEEE Transactions on Biomedical Engineering · 1979
Time-division multiplexing allows 24 channels of evoked potential data to be recorded on a seven track instrumentation tape recorder and later played back into a signal averager where it is simultaneously demultiplexed and averaged. Complimentary metal-oxide-semi-conductor (CMOS) switches provide a simple, low-cost way of increasing the number of recorded channels when the bandwidth of the recorder is sufficiently high.