Is the data from the streaming the actual amplitude (y axis) of the ECG/EKG?

Naseebullah · January 2018

I'm trying to visualise the data that is streaming in the electrocardiogram in my application. But I'm really confused whether the data that is retrieved from Cytone is the actual value of the ECG. As in, the community refers to the data as voltage.

Please elaborate on this matter.

Thanks

pushtheworld · January 2018

Can you please explain which data you are talking about? Where in the data acquisition pipeline such as in the firmware, driver, GUI, or output file

Naseebullah · January 2018

Yes, I'm referring to the output. @pushtheworld

So the Nodejs package in github (https://github.com/openbci/openbci_nodejs_cyton) provides us with the implementation of start streaming.

So what I'm trying to achieve is get the data that is being transmitted from Cyton board (Channel 4) and literally visualize the data.

My question is, what is the data that represents for each channel? The community refers the data as voltage which I'm confused because I'm aiming to get the ECG/EKG data.

wjcroft · January 2018

The link you provided shows the answer, it's in Volts. ECG is generally thought of in millivolts. Also note that you may want to remove any DC offset with a highpass filter before plotting.

https://www.google.com/search?q=ecg+millivolts

Naseebullah · January 2018

ah sweet, thank you @wjcroft. Is there any function that will allow us to filter DC offsets or the implementation is entirely on myself?

wjcroft · January 2018

There are a number of javascript DSP (digital signal processing) packages; which contain Filter functions. AJ @pushtheworld might have a favorite,

https://www.google.com/search?q=javascript+dsp

Is the data from the streaming the actual amplitude (y axis) of the ECG/EKG?

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