Is there any chance an accelerometer or other sensor could be used to pick up voice? It wouldn’t have to be great quality if you are searching for keywords. If

Is there any chance an accelerometer or other sensor could be used to pick up voice? It wouldn’t have to be great quality if you are searching for keywords. If you miss a few that’s fine since you are going for aggregates here. What about EM field detectors? Voice vibrates things which shows up indirectly. Modern phones have numerous sensors. Edit: one interesting paper found after some searching: https://arxiv.org/pdf/2212.12151 https://arxiv.org/pdf/2212.12151