How to stop your devices from listening to (and saving) everything you say

[Delboy]

Cortana possibly being the sneakiest one on this list.
http://www.foxnews.com/tech/2017/10/01/h...g-say.html

[rasbridge]

Very interesting article. I had never heard of ultrasonic tracking until reading it.

[Skunk1966]

What amazes me is that most people don't even think about what apps and other software does and what the consequenses are when using the mentioned apps and services.
I realize more and more that I haven't been paranoid at all when I started blocking/disabling from the start or just refused to use certain soft- and hardware

[Michaela Joy]

I remember reading about this technology years ago. IIRC, it used an ultrasonic "tag" to tie a cellular phone to a computer at a specific location.
That was before IPv6 was popularized. IP4 is just too generalized to pin someone down to a specific city block, much less a geo-location.

The biggest problem was the Nyquist limit of most sound cards at that time. Back then, 44.1 khz was the default for most sound cards. that sets the nyquist limit at 22.05 khz.
Trying to use ultrasonics would create aliases folding over into the audio range of the sound card.

These days, just about every sound card comes stock set to 48 khz (as opposed to 44.1 khz) That would set the nyquist limit at 24 khz.
If you used narrow-band FSK, I bet hardly anybody would know it was there.

FSK: https://en.wikipedia.org/wiki/Frequency-shift_keying

Nyquist Frequency: https://en.wikipedia.org/wiki/Nyquist_frequency

[Starwalker]

this the kinda shit that ppl read right before they start their "getting of the grid" journey. im not much into data privacy ,but thats mostly cause of how inconvenient it makes things. if sharing my data is not required, imma do my best to stay away from apps that do this kinda stuff

[nightloops]

we're not safe bro, it gives me goosebumps