Detection of ultrasonic side channels in mobile devices with Python?

[Terry Reedy]

Instead of berating us for not answering an extremely obscure question, 
you should have use Ms SearchBox first, like I did to determine whether 
these are real subjects.

On 2/28/2018 5:31 PM, Etienne Robillard wrote:
> If ultrasonic side channels are a threat to privacy, it is because smart 
> phones were designed to exploit this precise feature.

(Near) Ultrasonic beacons are apparently a real and rather sneaky 
tracking mechanism.

https://www.schneier.com/blog/archives/2017/05/using_ultrasoni.html
This is actually about using near-ultrasonic, 18-20 KHtz, which can be 
produced by some TVs and other off-the-shelf gear and detected by phone 
microphones.  Read or ask *them* about what android/Dalvik system calls 
they used to access phone microphones.

Investigate for yourself whether any Python implementations for Android 
give you such access.

> A great number of studies have shown that ultrasonic neuromodulation of 
> the central nervous system can be exploited via brain-computer 
> interfaces...

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4981830/ is a review 
article about clinical use for brain and nerve stimulation in patients. 
I am rather sure that they are talking about *real* ultrasound, well 
away from the audio range.  So this seems to be a completely separate topic.

-- 
Terry Jan Reedy