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Multichannel physiological monitor plus simultaneous full-duplex speech channel using a dial-up telephone line
1Northern Ireland Bioengineering Center, University of Ulster, Newtownabbey, Co. Antrim.
IEEE Transactions on Bio-Medical Engineering
|April 1, 1990
Abstract:
Because of bandwidth limitations, the Public Switched Telephone Network (PSTN) cannot normally accommodate simultaneous multichannel physiological signaling with speech. This communication describes work carried out to build a physiological monitoring system which can transmit up to six low-frequency data channels in the presence of a full-duplex speech channel using one telephone line.

