公开(公告)号：US10200774B1

公开(公告)日：2019-02-05

申请号：US15827045

申请日：2017-11-30

Applicant: Google LLC

Inventor： Yao Ding ,  Jianyi Liu ,  Yuxin Yang ,  David Sparks ,  Nidhi Rathi ,  Chi Kin Benjamin Leung

IPC: H04R1/10 ,  G01V3/08

Abstract: A sensor cord construction to prevent capacitance variation is described herein. A sensor may be connected to a controller via a cord that includes a first cable and a second cable. The first cable includes first shield wires that are twisted around the first cable in a first direction, and the second cable includes second shield wires that are twisted around the second cable in a second direction that is opposite the first direction. When the cord is twisted, one of the first or second cables may provide a positive capacitance variation, while the other of the first or second cables may provide a negative capacitance variation in an amount that is directly proportional to the positive capacitance variation. Thus, the controller detects a minimum capacitance variation, when the cord is twisted, due to the capacitance variation of the first cable and the second cable canceling each other out.