公开(公告)号：US20170328930A1

公开(公告)日：2017-11-16

申请号：US15153207

申请日：2016-05-12

Applicant: Google Inc.

Inventor： MARTIN UNSAL ,  Kenneth Louis Herman ,  Shao-Po Ma

IPC: G01P13/00 ,  G01P1/02

CPC classification number: G01P13/00 ,  G01P1/02 ,  H04M19/047

Abstract: A portable device such as a key fob includes a piezoelectric component, such as a vibrator or buzzer, and an accelerometer. Self-testing of the piezoelectric component in the portable device may be achieved by applying a test electrical signal to the piezoelectric component and determining whether a vibration is detected by the accelerometer. If a vibration is detected by the accelerometer, then a determination is made as to whether the vibration detected by the accelerometer matches the test electric signal applied to the piezoelectric component.