# US 11,112,441 B2 · Portable device for monitoring a subject and detecting a source of interference > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,112,441 B2 - Document ID: US11112441B2 - Status: Granted - Kind: B2 - Application number: 16/619,290 - Filed: 2018-06-21 - Published: 2020-05-07 - Granted: 2021-09-07 - Earliest claimed: 2017-06-30 - Assignees: Koninklijke Philips N.V. - Applicants: Koninklijke Philips N.V. - Inventors: Hansjoerg Geywitz; Albrecht Reinhard Kinzkofer - Web page: https://patentgrep.com/patent/US11112441B2 ## CPC - G01R 29/0814: {Field measurements related to measuring influence on or from apparatus, components or humans (EMC, EMI and similar testing in general G01R31/001), e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning} - G01R 31/001: {Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing (measuring electromagnetic fields G01R29/08; circuits for generating HV pulses in dielectric strength testing G01R31/14)} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract There is provided a portable device (100) for monitoring a subject and detecting a source of interference for the portable device (100). The portable device (100) comprises a detector (102) configured to detect the presence of interference in an environment of the portable device (100). The portable device (100) also comprises a processor (104) configured to determine a strength of the interference in the environment of the portable device (100) and to control a user interface (106) to provide an output at a frequency that depends on the determined interference strength. ## Claims ### Claim 1 A portable device for monitoring a subject and detecting a source of interference for the portable device, the portable device comprising: a detector configured to detect the presence of interference in an environment of the portable device; and a processor configured to: determine a strength of the interference in the environment of the portable device; and control a user interface to provide an output at a frequency that depends on the determined interference strength. ### Claim 2 (depends on 1) A portable device as claimed in claim 1, wherein the output is indicative of any one or more of a proximity of the portable device to a source of the interference for the portable device and a power of the interference from the source of the interference for the portable device. ### Claim 3 (depends on 1) A portable device as claimed in claim 1, wherein the portable device is a transducer. ### Claim 4 (depends on 1) A portable device as claimed in claim 1, wherein the processor is configured to control any one or more of: a light of the user interface to provide a visual output at a frequency that depends on the determined interference strength, wherein the frequency is the rate at which the visual output is provided; a speaker of the user interface to provide an audio output at a frequency that depends on the determined interference strength, wherein the frequency is any one or more of the rate at which the audio output is provided and the frequency corresponding to the pitch of the audio output; and a tactile component of the user interface to provide a tactile output at a frequency that depends on the determined interference strength, wherein the frequency is the rate at which the tactile output is provided. ### Claim 5 (depends on 1) A portable device as claimed in claim 1, wherein: the frequency increases when the interference strength is determined to increase and decreases when the interference strength is determined to decrease; or the frequency decreases when the interference strength is determined to increase and increases when the interference strength is determined to decrease. ### Claim 6 (depends on 1) A portable device as claimed in claim 1, wherein the portable device is operable to receive a user input to switch the portable device to an interference detection mode to trigger the detector to begin detecting the presence of interference in the environment of the portable device. ### Claim 7 A portable device for monitoring a subject and detecting a source of interference for the portable device, the portable device comprising: a detector configured to detect the presence of interference in an environment of the portable device; wherein the portable device is operable to receive a user input to switch the portable device to an interference detection mode to trigger the detector to begin detecting the presence of interference in the environment of the portable device and a processor configured to: determine a strength of the interference in the environment of the portable device; and control a user interface to provide an output at a frequency that depends on the determined interference strength, wherein the processor is configured to prevent the portable device from monitoring the subject when the portable device is in the interference detection mode. ### Claim 8 (depends on 1) A portable device as claimed in claim 1, wherein the portable device is configured to continue to operate irrespective of the determined interference strength. ### Claim 9 (depends on 1) A portable device as claimed in claim 1, wherein the detector is configured to detect the presence of interference on a wireless data link between the portable device and at least one other device. ### Claim 10 (depends on 1) A portable device as claimed in claim 1, wherein the interference comprises electromagnetic interference. ### Claim 11 (depends on 1) A portable device as claimed in claim 1, wherein the portable device is a fetal or maternal monitoring device. ### Claim 12 (depends on 1) A system comprising: a portable device as claimed in claim 1; and a base unit operable to communicate with the portable device. ### Claim 13 (depends on 12) A system as claimed in claim 12, wherein the base unit comprises the portable device and the portable device is removable from the base unit. ### Claim 14 A method of operating a portable device for monitoring a subject to detect a source of interference for the portable device, the method comprising: detecting the presence of interference in an environment of the portable device; determining a strength of the interference in the environment of the portable device; and controlling a user interface to provide an output at a frequency that depends on the determined interference strength. ### Claim 15 (depends on 14) A computer program product comprising a computer readable medium, the computer readable medium having computer readable code embodied therein, the computer readable code being configured such that, on execution by a suitable computer or processor, the computer or processor is caused to perform the method as claimed in claim 14.