Correlation in motion cancellation using AFE4400SPO2EVM

Ashutosh Shukla

Other Parts Discussed in Thread: AFE4400SPO2EVM, AFE4400

Hi all,

I'm trying to implement motion cancellation in PPG signals using the AFE4400SPO2EVM. I've soldered the MPU9150 on the EVM and I'm getting the data from three axes from it along with the PPG Red and IR values from PPG sensor which I've fixed below the EVM so that we get correlated motion data.

Right now I've calculated heart rate and spo2 without any motion noise. I've also implemented a motion cancellation filter which takes in noisy ppg signal and a correlated motion signal to output corrected signal.

What I'm stuck at is how to get a motion signal from the 3 axes MPU data which is correlated with the motion noise present in the PPG signal.Can anyone help me with that??

Now I know this may not be the suitable place for this post so moderators are free to move it to a more suitable place.

over 9 years ago

0 Christian Yots over 9 years ago

TI__Genius 14540 points

Hi,

We received your post regarding the AFE4400 and will get back to shortly with a response to your questions.

Thanks.

0 Ashutosh Shukla over 9 years ago in reply to Christian Yots

Prodigy 105 points

I'm replying just to keep this post active. I'm still waiting for the answer.

It will be good if community members also reply to this post.

I want it to be a discussion between the members..

0 Praveen Aroul over 9 years ago in reply to Ashutosh Shukla

TI__Mastermind 49176 points

I would suggest contacting Invense directly to provide any source code to read acceleration data from their sensor MPU9150.

0 Ashutosh Shukla over 9 years ago in reply to Praveen Aroul

Prodigy 105 points

Oh I'm already getting data from the MPU. It gives me 3 stream of data of X, Y, Z axes. This much I'm getting succesfully.

What I'm asking is how to generate a signal from these 3 axes motion data which will correlate to the motion noise present inside the heart rate signal?

This will be the signal which I'll feed into the LMS filter along with the motion corrupted heart rate data to get a motion-free heart rate signal.

0 Praveen Aroul over 9 years ago in reply to Ashutosh Shukla

TI__Mastermind 49176 points

Motion data to compensate for the motion noise in the pleth data!!

We do not hold expertise on this topic and I will let the experts in the community to respond to this.

I know that there is lot of IP revolving around this and I suspect if anyone will be willing to share this information.

Good luck.

0 Ashutosh Shukla over 9 years ago in reply to Praveen Aroul

Prodigy 105 points

I thought so too...

I'm working on my own code now...

Feel free if anyone wants to share...

Thanks anyway.... :)

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Correlation in motion cancellation using AFE4400SPO2EVM