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SOHViewer does not intend to read all data of each channel because it not only slow down the process of reading data but also breaking the plotting of data.
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Many works have tried to apply down sample to plot with different sample frequencies for different size of zooming but the performance were too bad to be accepted.
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Many attempt have been done to try to apply down sample to plot with different sample frequencies for different zoom levels but the performance were too bad to be accepted.
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As the result, we decided to read 2 data points of every record frame of data. So the result that displayed on the figure isn't the actual sampling rate of the data. Anyway the intention of SOHViewer is to have a quick look at the channels. User can use PQL to have more detail of the data.
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