公开(公告)号：US11848725B2

公开(公告)日：2023-12-19

申请号：US17691619

申请日：2022-03-10

Applicant: NXP B.V.

Inventor： Johannes Stahl ,  Markus Wobak ,  Ulrich Andreas Muehlmann

IPC: H04B5/00 ,  G06K7/10 ,  G06K19/07

CPC classification number: H04B5/0031 ,  G06K7/10336 ,  H04B5/0056 ,  G06K19/0726

Abstract: Near field communication (NFC) methods, systems, and devices are disclosed herein. In an example embodiment, the method includes providing a first NFC device including a NFC antenna, and transmitting a radio frequency (RF) signal including a RF carrier signal by way of the NFC antenna. Also, the method includes receiving a first resonant signal after the transmitting has ceased, and processing the first resonant signal to generate a first portion of transformed signal information. Further, the method includes identifying one or both of a first state and a first event based at least in part upon or associated with the first portion of the transformed signal information.

公开(公告)号：US20230291437A1

公开(公告)日：2023-09-14

申请号：US17691619

申请日：2022-03-10

Applicant: NXP B.V.

Inventor： Johannes Stahl ,  Markus Wobak ,  Ulrich Andreas Muehlmann

IPC: H04B5/00 ,  G06K7/10

CPC classification number: H04B5/0031 ,  H04B5/0056 ,  G06K7/10336 ,  G06K19/0726

Abstract: Near field communication (NFC) methods, systems, and devices are disclosed herein. In an example embodiment, the method includes providing a first NFC device including a NFC antenna, and transmitting a radio frequency (RF) signal including a RF carrier signal by way of the NFC antenna. Also, the method includes receiving a first resonant signal after the transmitting has ceased, and processing the first resonant signal to generate a first portion of transformed signal information. Further, the method includes identifying one or both of a first state and a first event based at least in part upon or associated with the first portion of the transformed signal information.

公开(公告)号：US20240356558A1

公开(公告)日：2024-10-24

申请号：US18611022

申请日：2024-03-20

Applicant: NXP B.V.

Inventor： Mark Feichtinger ,  Johannes Stahl ,  Ulrich Andreas Muehlmann

IPC: H03M1/12 ,  G11B20/00

CPC classification number: H03M1/12 ,  G11B20/00007

Abstract: In accordance with a first aspect of the present disclosure, a communication device is provided, comprising: a front-end configured to receive an analog input signal, wherein the front-end comprises an analog-to-digital converter configured to convert the analog input signal into a digital signal; a digital signal processor configured to receive and process said digital signal; wherein the front-end further comprises a compressor operatively coupled to an input of the analog-to-digital converter, wherein said compressor is configured to apply a compressor function to the analog input signal before said analog input signal is provided to the analog-to-digital converter. In accordance with a second aspect of the present disclosure, a corresponding method of operating a communication device is conceived.

公开(公告)号：US20240346262A1

公开(公告)日：2024-10-17

申请号：US18301315

申请日：2023-04-17

Applicant: NXP B.V.

Inventor： Pouyan Ebrahimbabaie Varnosfaderani ,  Johannes Stahl ,  Ulrich Andreas Muehlmann

IPC: G06K7/10 ,  G06K7/00

CPC classification number: G06K7/10237 ,  G06K7/0008

Abstract: A method and wireless device with a counterpart presence detector is provided. The detector includes only memory and logic circuits to detect a change in a ringing artifact from the presence of a RF device. The memory stores template signals and threshold values. The template signals may be generated using a metal object positioned various distances from the RF device. The ringing artifact, also called an RF-off signal, is sampled. A difference between subsequent ringing artifact samples is taken to produce a ringing artifact difference. Also, a difference between subsequent samples of a template signal is taken to produce a template difference. A Euclidean distance between the ringing artifact difference and the template difference is determined. The distance is compared to a threshold value. A presence of another RF device within the RF field of the RF device is detected if the distance compares favorably to the threshold value.

公开(公告)号：US11764833B2

公开(公告)日：2023-09-19

申请号：US17452806

申请日：2021-10-29

Applicant: NXP B.V.

Inventor： Johannes Stahl ,  Ulrich Andreas Muehlmann ,  Adrian Rafael Krenn

IPC: H04B5/00 ,  H04L5/00

CPC classification number: H04B5/0062 ,  H04B5/0068 ,  H04L5/0048

Abstract: There is described a method of determining a phase value for an NFC card emulating device that enables said NFC card emulating device to communicate in phase with an NFC reader device while utilizing active load modulation, wherein the NFC card emulating device comprises a card antenna and the NFC reader device comprises a reader antenna, the method comprising receiving a reader signal from the NFC reader device at the NFC card emulating device through coupling of the card antenna and the reader antenna, the reader signal comprising a subcarrier modulation; estimating a resonance frequency of a system corresponding to the coupled card antenna and reader antenna based on the received communication signal; and determining the phase value based on the estimated resonance frequency and a set of parameters that represents a predetermined reference system. Furthermore, an NFC card emulating device, an NFC system, and a computer program are described.