公开(公告)号：US20250107757A1

公开(公告)日：2025-04-03

申请号：US18374560

申请日：2023-09-28

Applicant: Apple Inc.

Inventor： Adriaan J. Taal ,  Amandeep Singh

IPC: A61B5/00 ,  G16H40/67

Abstract: A device includes a physiological sensor having a plurality of sensing electrodes, and a signal combining chip having a plurality of input channels, a waveform generator, a summing circuit, and an output channel. The plurality of input channels are configured to receive a plurality of voltage signals. Each input channel is configured to receive a respective one of the plurality of voltage signals from a respective one of the plurality of sensing electrodes. The waveform generator is configured to generate a set of modulation signals, each of which modulates a corresponding voltage signal of the plurality of voltage signals to generate a corresponding encoded voltage signal and form a set of encoded voltage signals. The summing circuit is configured to superimpose the set of encoded voltage signals to form a combined voltage signal that is outputted through the output channel.

公开(公告)号：US20250068239A1

公开(公告)日：2025-02-27

申请号：US18776052

申请日：2024-07-17

Applicant: Apple Inc.

Inventor： Tao Shui ,  Adriaan J. Taal ,  Na Huang

IPC: G06F3/01 ,  G06F1/16 ,  G06F3/0488

Abstract: Embodiments are directed to methods, devices and systems for determining and applying a gain adjustment to sensed electrical signals. The methods can include operating a device to determine that a user is wearing the wearable electronic device and applying a test signal to a sensing electrode of the wearable device. An input impedance for the sensing electrode can be determined using the test signal. The input impedance and a baseline impedance can be used to determine a gain adjustment. An electrical signal of the user can be measured using the sensing electrode and the gain adjustment can be applied to the electrical signal. A physiological parameter of the user can be determined using the measured electrical signal having the gain adjustment applied.