Jump to content

Occupancy Sensor Interference


Recommended Posts

The problems I have heard about with occupancy sensors don't involve RF.  Rather some use ultrasonic signals as the detection mechanism.  These signals, though inaudible, can be quite strong and can be picked up by a microphone.  In certain transmitters, the low pass filtering on the input is not sufficient to prevent the ultrasonic signal from having an effect on the compander stage.  This creates artifacts that show up in the audible frequencies.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...