What if they have a bunch of prerecorded data for the guys heart, then use a lock in amplifier to see if there is a signal in the noise https://en.wikipedia.or

What if they have a bunch of prerecorded data for the guys heart, then use a lock in amplifier to see if there is a signal in the noise https://en.wikipedia.org/wiki/Lock-in_amplifier https://en.wikipedia.org/wiki/Lock-in_amplifier