公开(公告)号：US12089953B1

公开(公告)日：2024-09-17

申请号：US17112629

申请日：2020-12-04

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Ning Guo ,  Jonathan Reid

IPC: G06F3/01 ,  A61B5/00 ,  A61B5/313 ,  G01R27/26 ,  G01R29/26

CPC classification number: A61B5/6843 ,  A61B5/313 ,  A61B5/7221 ,  G01R27/26 ,  G01R29/26 ,  G06F3/015 ,  A61B2560/0209

Abstract: The disclosed computer-implemented method may include (1) sampling an output signal of an amplifier that amplifies a voltage difference between two electrodes, (2) calculating, based on a power spectral density of the output signal, a noise power of the output signal over a predetermined frequency band, (3) estimating an interface impedance of at least one of the two electrodes based on the noise power and a predetermined intrinsic current noise of the amplifier, and (4) performing an operation based at least in part on the estimated interface impedance. Various other methods, systems, and devices are also disclosed.

公开(公告)号：US11961494B1

公开(公告)日：2024-04-16

申请号：US16832978

申请日：2020-03-27

Applicant: META PLATFORMS TECHNOLOGIES, LLC

Inventor： Ning Guo ,  Akshay Yembarwar ,  Jonathan Reid ,  Daniel Wetmore

IPC: G09G5/36 ,  A61B5/00 ,  A61B5/296 ,  G06F3/01 ,  H03F3/45 ,  H03M1/08

CPC classification number: G09G5/36 ,  A61B5/296 ,  A61B5/6803 ,  G06F3/014 ,  G06F3/017 ,  H03F3/45475 ,  A61B2562/0219 ,  G09G2354/00 ,  H03M1/08

Abstract: Methods and systems for reducing electromagnetic interference in analog circuit of a control device for an augmented reality (AR) or virtual reality (VR) system are described. An analog circuit associated with the control device may include at least one amplifier and an analog-to-digital converter coupled to an amplifier by one or more electrical conductors. Electromagnetic interference induced in the one or more electrical conductors by an external AC magnetic field may be reduced using at least one component of the control device configured to reduce the electromagnetic interference.