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Posted by RPSG T on November 12, 2002 at 08:50:55:In Reply to: Re: SAMPLING RATES posted by RPSGT on November 11, 2002 at 22:10:23:
Sampling Rate should be very high. A high sample rate can yeild a higher quality signal. I think most of the newer systems sample around 2,000 Hz and higher.
'Storage Rates' vary dramatically from system to system. As the previous post stated, you need to store at least double the frequency of the signal you are attempting to collect.
A typical recording in my lab is around 125 Mb. Since I have 40Gb per computer and archive immediately after scoring, I never encounter problems with files being too large or taking up too much space on my PC. I use a 64 Mb graphics card on my system. It pages faster than I can read the data. I do not think a higher storage rate would slow down the display of data on my PC.
I'm not totally sure of the storage rate for my oximeter or the DC channels (Nasal Pressure) on my system, so I took a guess at those storage rates.
EEG = 200 or higher
EOG = 200 or higher
Chin, Leg EMG = 200 or higher
ECG = 200 or higher
Nasal Pressure = 30 or higher
Snore Microphone = 200 or higher
Respiratory thermistor, belts, CPAP Flow = 30 or higher
Oximeter = 10 or higher
CPAP Pressure = 30 or higher
Position Sensor = 1
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