Long-term supervised domiciliary EEG monitoring in epileptic patients employing radio telemetry and telephone telemetry. I. Telephone telemetry system.

A PCM system provides digital transmission of 8 EEG channels over conventional voice graded telephone lines. Transmission of the EEG from the patient's residence to the clinical centre enables the use of existing monitoring facilities for carrying out continuously supervised long-term domiciliary EEG monitoring. Secondary channels simultaneously enable exchange of information for quality and performance control. The ease of use and the flexibility of the public telephone system enable recording from almost any place desired.