Dear mrueschman,
In the discription of SHHS dataset, I found that :
The recording montage consisted of:
C3/A2 and C4/A1 EEGs, sampled at 125 Hz
right and left electrooculograms (EOGs), sampled at 50 Hz
a bipolar submental electromyogram (EMG), sampled at 125 Hz
thoracic and abdominal excursions (THOR and ABDO), recorded by inductive plethysmography bands and sampled at 10 Hz
“airflow” detected by a nasal-oral thermocouple (Protec, Woodinville, WA), sampled at 10 Hz
finger-tip pulse oximetry (Nonin, Minneapolis, MN) sampled at 1 Hz
ECG from a bipolar lead, sampled at 125 Hz for most SHHS-1 studies and 250 Hz for SHHS-2 studies
Heart rate (PR) derived from the ECG and sampled at 1 Hz
body position (using a mercury gauge sensor)
ambient light (on/off, by a light sensor secured to the recording garment)
So my first question is: Does there contain Heart rate signals in the EDF files?
In fact, I have had a try to read the edf files in matlab. No matter what kinds of signals, there are many extreme values (value >1000) appears regularly (one in 635 data points). I don't know why. Maybe there is a mistake in the reading code, but unfortunately, I haven't found it. Could you kindly do me a favor? I suppose the following sentence have a mistake:
data = fread(fp,'int16');
There comes my second question : Is the signal data in edf files stored in "int16" type?
Thank you very much for precious time. Looking forward for your kind reply.