Rezazadeh M, Evans NE. Multichannel physiological monitor plus simultaneous full-duplex speech channel using a dial-up telephone line.
IEEE Trans Biomed Eng 1990;
37:428-32. [PMID:
2338358 DOI:
10.1109/10.52352]
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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.
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