An ambulatory the Vitaport-4 PSG has 10 polygraphic channels for neurophisiological signals. The 1 Nasal flow, records either with a nasal cannula or from a CPAP mask by deriving the AC component of the raw pressure signal. The 1 channel CPAP pressure records by deriving the DC component of the raw pressure signal.1 snoring is derived from the pressure input. It includes 2 inductive respiration belts (Thorax and Abdomen), 1 Airflow thermistor, 1 snoring microphone, 2 bipolar channels for ECG/EMG and 1 intergrated body position sensor.
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