If that meeting room also has remote attendee's then that may well prove the issue. However with ultrasonic filters - you could cone of using this. Then such

If that meeting room also has remote attendee's then that may well prove the issue. However with ultrasonic filters - you could cone of using this. Then such approaches have often been used like vibrating windows to curtail laser microphones and yes the trick of taping a vibrator to the window does work - though not in keeping with your boardroom aesthetics unless your Anne Summers or the like.