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1. (WO2019002060) A PORTABLE DEVICE FOR MONITORING A SUBJECT AND DETECTING A SOURCE OF INTERFERENCE
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CLAIMS:

1. A portable device (100) for monitoring a subject and detecting a source of interference for the portable device (100), the portable device (100) comprising:

a detector (102) configured to detect the presence of interference in an environment of the portable device (100); and

a processor ( 104) configured to :

determine a strength of the interference in the environment of the portable device (100); and control a user interface (106) to provide an output at a frequency that depends on the determined interference strength.

2. A portable device (100) as claimed in claim 1, wherein the output is indicative of any one or more of a proximity of the portable device (100) to a source of the interference for the portable device (100) and a power of the interference from the source of the interference for the portable device (100).

3. A portable device (100) as claimed in any one of claims 1 or 2, wherein the portable device (100) is a transducer.

4. A portable device (100) as claimed in any one of the preceding claims, wherein the processor (104) is configured to control any one or more of:

a light (200) of the user interface (106) 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 (106) 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 (106) 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.

5. A portable device (100) as claimed in any one of the preceding claims, 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.

6. A portable device (100) as claimed in any one of the preceding claims, wherein the portable device (100) is operable to receive a user input to switch the portable device (100) to an interference detection mode to trigger the detector (102) to begin detecting the presence of interference in the environment of the portable device (100).

7. A portable device (100) as claimed in claim 6, wherein the processor (102) is configured to prevent the portable device (100) from monitoring the subject when the portable device (100) is in the interference detection mode.

8. A portable device (100) as claimed in any one of claims 1 to 6, wherein the portable device (100) is configured to continue to operate irrespective of the determined interference strength.

9. A portable device (100) as claimed in any one of the preceding claims, wherein the detector (102) is configured to detect the presence of interference on a wireless data link between the portable device (100) and at least one other device.

10. A portable device (100) as claimed in any one of the preceding claims, wherein the interference comprises electromagnetic interference.

11. A portable device (100) as claimed in any one of the preceding claims, wherein the portable device (100) is a fetal or maternal monitoring device.

12. A system comprising :

a portable device (100) as claimed in any one of the preceding claims; and a base unit operable to communicate with the portable device (100).

13. A system as claimed in claim 12, wherein the base unit comprises the portable device (100) and the portable device (100) is removable from the base unit.

14. A method (400) of operating a portable device (100) for monitoring a subject to detect a source of interference for the portable device (100), the method (400) comprising:

detecting (402) the presence of interference in an environment of the portable device (100);

determining (404) a strength of the interference in the environment of the portable device (100); and

controlling (406) a user interface (106) to provide an output at a frequency that depends on the determined interference strength.

15. 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.