PPG readings - what are the definition of each channel?

[rextea]

Platform your question concerns:

• [X] Android
• [ ] iOS
• [ ] Other
• [ ] Platform is not relevant for this question

Device:

• [ ] Polar OH1
• [X] Polar Verity Sense
• [ ] Polar H10
• [ ] Polar H9
• [ ] Other
• [ ] Device is not relevant for this question

Description: When receiving PPG readings from the device, I have 4 different channels of readings: [ { "timeStamp": 536614827214192000, "channelSamples": [380537, 435635, 480333, 184225] }, { "timeStamp": 536614827221600000, "channelSamples": [380580, 435675, 480483, 184183] }, { "timeStamp": 536614827229007000, "channelSamples": [380624, 435696, 480645, 184177] },... ] I'm trying to understand what are the difference and purpose of each one of them? and which one of them should I use to analyze and extract metrics such as P P intervals, heart rate, HrV metrics, etc...

Thanks in advance :)

[jimmyzumthurm]

Hi @rextea , Verity Sense has 3 pairs of green LEDs used for PPG signal sampling, so 3 channels in total and the fourth one is ambient channel that is used for ambient noise cancellation by the HR/PPI algorithm in use in Verity Sense. I'm no algorithm expert and I can't really give deep guidance about handling this data, but you should be able to calculate the PP-intervals using a single of the 3 PPG channels as a starter.

[rextea]

Hi @rextea , Verity Sense has 3 pairs of green LEDs used for PPG signal sampling, so 3 channels in total and the fourth one is ambient channel that is used for ambient noise cancellation by the HR/PPI algorithm in use in Verity Sense. I'm no algorithm expert and I can't really give deep guidance about handling this data, but you should be able to calculate the PP-intervals using a single of the 3 PPG channels as a starter.

Understood. many thanks :)