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A comment on Google says Nest’s built-in mic not listed in specs was not meant to be secret. Parent comment

Re:Google says Nest’s built-in mic not listed in specs was n... by gojomo on Wednesday February 20, 2019 @12:55PM (#19210116)
Some on-chip gyros/accelerometers can also work as microphones – and may be even harder to separate those via an external cut-off switch.
[ Parent | on HN ]
Re:Google says Nest’s built-in mic not listed in specs was n... by jhayward on Wednesday February 20, 2019 @03:21PM (#19211594)
So can capacitors - a common factor to avoid in amplifier design - and at the limit, so can just about any semiconductor.
[ Parent | on HN ]