JP2015055506A - Electronic clinical thermometer and notification device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic clinical thermometer capable of certainly notifying a user of the completion of thermometry.SOLUTION: The electronic clinical thermometer (1) includes: a temperature measurement unit (11) for detecting the temperature of a part to be measured; a piezoelectric buzzer (16) for issuing a buzzer sound in response to the completion of the thermometry by the temperature measurement unit; a sound collection unit (21); a determination unit (23) for determining whether or not the sound wave collected by the sound collection unit is a buzzer sound of the piezoelectric buzzer, on the basis of the presence/absence of a harmonic wave specific to the buzzer sound; and a notification unit (24) for reporting that the buzzer sound of the piezoelectric buzzer is detected, in accordance with the determination result of the determination unit.

Description

  The present invention relates to an electronic thermometer and a notification device.

  Many electronic thermometers currently in use have a predictive temperature measuring function and an actual temperature measuring function. Such an electronic thermometer notifies the user of the completion of temperature detection by, for example, the completion of predicted temperature detection several tens of seconds after the start of temperature detection and the completion of measured temperature detection several minutes after the start of temperature detection. A buzzer sound of a general electronic device including an electronic thermometer often has a frequency band of about 2 to 4 kHz. This is because about 2 to 4 kHz is an audible frequency that is easy for a normal person to hear, and the sound pressure of the piezoelectric buzzer is easily obtained.

  However, especially for elderly people, the high frequency audibility of hearing deteriorates, so that a high-frequency buzzer of 1 kHz or more is difficult to hear. For this reason, various techniques for making it easy to hear the buzzer sound of an electronic device have been proposed.

  For example, in Patent Literature 1, a buzzer sound that is easy to hear even for elderly people is generated by a buzzer sound notification means that notifies a plurality of sounds composed of two or three types of frequencies according to a predetermined pattern when the temperature detection operation is completed. An electronic thermometer that can be described is described. In Patent Document 2, a notification sound that informs a change in the operating state of an electrical device is sensed and captured, and by outputting auditory information and visual information according to the captured notification sound, a notification sound emitted from the electrical device is provided. A notification sound conversion device is described that enables an elderly person to accurately recognize the sound. Patent Document 3 describes a notification device that is attached to the main body of a device, detects a notification sound emitted by the device, and generates a notification sound having a large volume or a different frequency that is easier to recognize.

JP 2007-024594 A JP 2004-020817 A JP 2002-31858 A

  Since the electronic thermometer is used in a state where the main body is sandwiched between the armpits and covered with clothing, the buzzer sound emitted from the electronic thermometer is absorbed by the clothing depending on the material of the clothing. Therefore, even if processing such as conversion to a frequency that is easy to hear is performed, the buzzer sound generated from the clothing is still difficult to hear, and the user may not be able to recognize the completion of the temperature measurement. Further, in the conventional technique for converting the notification sound and outputting it, the buzzer sound is identified by a pulse train. If a disturbance sound is mixed when the buzzer sound propagates in the air, the pulse train of the buzzer sound may not be accurately identified.

  Accordingly, an object of the present invention is to provide an electronic thermometer that can reliably notify the user of the completion of the temperature measurement as compared with the case where the present configuration is not provided.

  An electronic thermometer according to the present invention includes a temperature measurement unit that detects the temperature of a measurement site, a piezoelectric buzzer that emits a buzzer sound when temperature measurement by the temperature measurement unit is completed, a sound collection unit, and a sound collection unit. A determination unit that determines whether the collected sound wave is a buzzer sound of a piezoelectric buzzer based on the presence or absence of harmonics unique to the buzzer sound, and the buzzer sound of the piezoelectric buzzer is detected according to the determination result by the determination unit And a notifying unit for notifying that it has been performed.

  In the electronic thermometer according to the present invention, the determination unit has a level of the sound wave collected by the sound collection unit exceeding a predetermined threshold for the fundamental frequency and the harmonic frequency of the buzzer sound of the piezoelectric buzzer. Sometimes, it is preferable to determine that the sound wave is a buzzer sound.

  In the electronic thermometer according to the present invention, it is preferable that the notifying unit notifies by vibration that the buzzer sound of the piezoelectric buzzer is detected.

  In the electronic thermometer according to the present invention, the sound collection unit, the determination unit, and the notification unit are preferably configured as a notification unit separated from the main body including the temperature measurement unit and the piezoelectric buzzer.

  In addition, the notification device according to the present invention is configured to determine whether the sound wave collected by the sound collecting unit and the sound collecting unit is a buzzer sound of a piezoelectric buzzer built in an electronic thermometer. It has a determination part determined based on the presence or absence, and a notification part for notifying that a buzzer sound of a piezoelectric buzzer has been detected according to the determination result of the determination part.

  According to the electronic thermometer of the present invention, the completion of the temperature measurement can be reliably notified by the user as compared with the case where this configuration is not provided.

1 is an external view of an electronic thermometer 1. FIG. 2 is a functional block diagram of the electronic thermometer 1. FIG. FIG. 6 is a diagram for explaining a piezoelectric buzzer 16. It is a figure which shows the example of the frequency spectrum of the sound wave collected by the sound-collecting part, when the buzzer sound is not emitted by the piezoelectric buzzer 16 and when it is producing | generating. 4 is a sequence diagram showing an operation example of the main body 10 and the notification unit 20 of the electronic thermometer 1. FIG. 2 is an external view of a notification unit 40 that can be mounted on a garment 50. FIG.

  Hereinafter, an electronic thermometer and a notification device according to the present invention will be described in detail with reference to the accompanying drawings. However, it should be noted that the technical scope of the present invention is not limited to these embodiments, but extends to the invention described in the claims and equivalents thereof.

  FIG. 1 is an external view of the electronic thermometer 1. The electronic thermometer 1 has a main body 10 and a notification unit 20.

  The main body 10 is a main body portion of the electronic thermometer 1 that is used while being sandwiched between armpits, and includes a temperature measuring unit 11, a display unit 12, and a switch 13. The temperature measuring unit 11 detects the temperature of the part to be measured. The display unit 12 displays a measured value of the body temperature and that the measurement is being performed. The switch 13 is a switch for turning on / off the power supply of the main body 10.

  The notification unit 20 detects a buzzer sound when the electronic thermometer 1 completes temperature detection, converts the buzzer sound into a different form such as light or vibration that is easier to perceive, and notifies the user. The notification unit 20 has, for example, a rubber cap shape, and is fitted into an end portion of the main body 10 opposite to the temperature measuring portion 11.

  FIG. 2 is a functional block diagram of the electronic thermometer 1.

  The main body 10 includes a temperature measuring unit 11, a display unit 12, a switch 13, a temperature storage unit 14, a control unit 15, and a piezoelectric buzzer 16.

  The temperature storage unit 14 is a memory that stores measured temperature values that are sequentially measured by the temperature measuring unit 11. Further, the temperature storage unit 14 also stores a measurement value when the electronic thermometer 1 is used last time.

  The control unit 15 includes a memory, a CPU, and the like in which a control program for the electronic thermometer 1 is stored, and includes a prediction unit 15A and a stability detection unit 15B as functional blocks that perform predicted temperature measurement and actual temperature measurement.

  The prediction unit 15A sequentially acquires the actually measured temperatures detected by the temperature measuring unit 11, and uses the calculation equation for prediction by using the actually measured temperature at a preset time after the start of measurement as the prediction calculation data. Calculate the predicted temperature. It should be noted that the number of data to be fetched as prediction calculation data, the timing to fetch, and the like can be set as appropriate. The control unit 15 causes the display unit 12 to display the predicted temperature calculated by the prediction unit 15A. Further, the control unit 15 drives the piezoelectric buzzer 16 to generate a buzzer sound when the predicted temperature detection by the prediction unit 15A is completed.

  The stability detection unit 15B compares the measured temperature detected by the temperature measurement unit 11 with the maximum temperature value stored in the temperature storage unit 14, and whether the temperature measurement unit 11 is in a thermal equilibrium state and the temperature rise is stable. Determine whether or not. When it is determined that the stable state has been reached, the stability detection unit 15B switches the predicted temperature displayed on the display unit 12 to the actual measurement temperature, and displays the final actual measurement temperature. Further, the control unit 15 drives the piezoelectric buzzer 16 to generate a buzzer sound when the stability detection unit 15B determines that the stable state has been reached and the actual temperature measurement is completed.

  The piezoelectric buzzer 16 emits a buzzer sound for notifying the user when the predicted temperature detection is completed and when the actual temperature measurement is completed. The piezoelectric buzzer 16 notifies the user of the completion of the predicted temperature detection and the completion of the measured temperature detection by changing the number of occurrences and the length of the buzzer sound, for example, 3 times when the predicted temperature detection is completed and 5 times when the measured temperature detection is completed.

  The notification unit 20 includes a sound collection unit 21, an amplifier 22, a determination unit 23, a notification unit 24, and a switch 25.

  The sound collection unit 21 is a microphone for detecting a buzzer sound generated by the piezoelectric buzzer 16. In the example shown in FIG. 1, since the notification unit 20 is fitted in the end of the main body 10, the sound collection unit 21 has a sensitivity that can detect sound waves within the range of the size of the electronic thermometer 1. Adjust to.

  The amplifier 22 amplifies the sound wave collected by the sound collection unit 21 into an electric signal of an appropriate level for subsequent processing.

  The determination unit 23 is a control unit for detecting a buzzer sound at the completion of temperature measurement of the electronic thermometer 1, and includes a memory, a CPU, and the like in which a control program is stored. The determination unit 23 includes a band pass filter (BPF) 23A and a spurious determination unit 23B as functional blocks.

  The BPF 23A is a filter that extracts a frequency component of, for example, 1 to 8 kHz after converting the signal amplified by the amplifier 22 into a frequency spectrum by fast Fourier transform (FFT).

  The spurious determination unit 23B determines whether or not the sound wave collected by the sound collection unit 21 is a buzzer sound of the piezoelectric buzzer 16 based on the presence or absence of harmonics unique to the buzzer sound of the piezoelectric buzzer 16. Details of this determination method will be described later.

  The notification unit 24 is a vibrator, for example, and notifies the user that the buzzer sound of the piezoelectric buzzer 16 has been detected according to the determination result by the determination unit 23 without using sound waves. That is, when the spurious determination unit 23B determines that the sound wave collected by the sound collection unit 21 is the buzzer sound of the piezoelectric buzzer 16, the notification unit 24 notifies the user by vibrating the notification unit 20. To do. For example, in accordance with the determination by the determination unit 23, the notification unit 24 performs notification by using the number of times and the length of vibration corresponding to the number of occurrences and the length of the buzzer sound. For example, the notification unit 24 performs vibration notification three times and five times in response to three buzzer sounds when the predicted temperature detection is completed and five buzzer sounds when the measured temperature measurement is completed.

  Alternatively, since it is known that the buzzer sound is generated from the main body 10 twice when the predicted temperature detection is completed and when the measured temperature detection is completed, the notification unit 24 is, for example, the first time (that is, when the predicted temperature detection is completed). The duration or intensity of vibration may be changed depending on which operation is the first or second operation, such as vibration for 30 seconds for the second time (that is, when the measured temperature is completed) for 5 seconds.

  The switch 25 is a switch for turning on / off the power supply of the notification unit 20.

  3A to 3C are diagrams for explaining the piezoelectric buzzer 16. The piezoelectric buzzer 16 is a buzzer that uses a flexural vibration of a piezoelectric vibration plate formed by bonding a thin plate-like piezoelectric element polarized in the thickness direction and a metal thin plate as a sound source. Piezoelectric buzzers are widely used in general electronic thermometers due to their small size and low power consumption.

  FIG. 3A is a cross-sectional view in the thickness direction of the piezoelectric vibration plate 33 in which the piezoelectric element 31 and the metal thin plate 32 are bonded together. The piezoelectric element 31 has a property of contracting when a voltage in the same direction as the polarization direction is applied and expanding when a voltage in the opposite direction is applied. Therefore, the piezoelectric buzzer generates a buzzer sound by expanding and contracting the piezoelectric element by applying a voltage to cause the piezoelectric diaphragm 33 to bend. However, since sufficient sound pressure cannot be obtained with the piezoelectric diaphragm 33 alone, the piezoelectric buzzer is formed by fixing the piezoelectric diaphragm to the resonator.

  FIG. 3B is a cross-sectional view of the piezoelectric buzzer 16 having the piezoelectric diaphragm 33 and the resonator 34. The piezoelectric diaphragm 33 is fixed in a state in which, for example, an end portion of a piezoelectric element is supported and suspended in the resonator 34. Thereby, a buzzer sound having a resonance frequency corresponding to the shape of the resonator 34 is emitted from the sound emitting hole 35.

  FIG. 3C is a schematic diagram illustrating an example of a driving waveform of a piezoelectric buzzer and a waveform of a sound wave generated from the piezoelectric buzzer. For example, when the piezoelectric buzzer is driven with a voltage of a rectangular wave of 2 kHz, a resonance wave is generated in the resonator, thereby generating a sound wave having a frequency higher than 2 kHz.

  When the resonator 34 of the piezoelectric buzzer 16 is attached to the main body 10 of the electronic thermometer 1, a composite sound wave of a fundamental wave and a sound wave by a specific spurious is generated by resonance vibration. Spurious is a harmonic frequency component, and in the case of a piezoelectric buzzer having a resonator, a composite sound wave of a fundamental wave, a second harmonic, and a third harmonic is generated. For example, as shown in FIG. 3C, when the piezoelectric buzzer is driven with a 2 kHz rectangular wave, this 2 kHz becomes the fundamental frequency of the buzzer sound, and its second and third harmonics are around 4 kHz and 6 kHz. A sound wave that contains the frequency component of is generated.

  4A and 4B show examples of frequency spectra of sound waves collected by the sound collecting unit 21 when the piezoelectric buzzer 16 does not emit a buzzer sound and when the piezoelectric buzzer 16 emits a buzzer sound, respectively. It is. The horizontal axis of each graph is frequency (Hz) and the vertical axis is level (dB). Comparing the frequency spectra of FIG. 4 (A) and FIG. 4 (B), in FIG. 4 (B) when the buzzer sound is generated, 2 kHz, 4 kHz, and 6 kHz as indicated by reference numerals ac, respectively. A peak can be seen near.

  Therefore, the spurious determination unit 23B of the notification unit 20 determines whether or not the frequency spectrum of 1 to 8 kHz extracted by the BPF 23A has a spurious (harmonic) pattern that is a characteristic unique to the buzzer sound of the piezoelectric buzzer. Through such spurious pattern determination processing, the spurious determination unit 23B identifies the buzzer sound of the piezoelectric buzzer 16 and disturbance noise.

Specifically, the spurious determination unit 23B has a predetermined level of amplitude of a frequency spectrum in a certain range centered on each frequency for the fundamental wave, the second harmonic, and the third harmonic of the buzzer sound. It is determined whether it is above. The spurious determination unit 23B, for example,
(A) The peak component within 2.0 ± 0.3 kHz is −60 db or more (b) The peak component within 4.0 ± 0.3 kHz is −60 db or more (c) 6.0 ± 0.3 kHz The frequency spectrum to be determined has a buzzer sound spurious pattern and is determined to be a buzzer sound of the piezoelectric buzzer 16 when all of the three conditions of the peak component are −60 db or more are satisfied. The frequency range of ± 0.3 kHz and the reference level of −60 db may be determined by appropriately adjusting so that a buzzer sound from the main body 10 close to the notification unit 20 can be detected. In this way, the spurious determination unit 23B detects the buzzer sound of the piezoelectric buzzer 16 from the disturbance noise.

  Note that the fundamental wave and spurious frequency of the buzzer sound vary depending on the piezoelectric buzzer used. Therefore, the frequency of the determination criteria (a) to (c) used by the spurious determination unit 23B is set in accordance with the piezoelectric buzzer of the electronic thermometer targeted by the notification unit 20.

  FIG. 5 is a sequence diagram illustrating an operation example of the main body 10 and the notification unit 20 of the electronic thermometer 1. The process of each step shown in FIG. 5 is performed by the control unit 15 of the main body 10 and the determination unit 23 that is a control unit of the notification unit 20.

  First, when the switch 13 of the main body 10 is turned on, the control unit 15 of the main body 10 displays all the display segments of the display unit 12 so that the switch is turned on (S1). And the control part 15 reads the last measured value memorize | stored in the temperature memory | storage part 14, and displays it on the display part 12 (S2).

  Subsequently, the control unit 15 causes the temperature measurement unit 11 to start temperature measurement and causes the display unit 12 to display that the predicted temperature measurement is being performed (S3). When temperature measurement is started, the temperature measuring unit 11 sends the detected actual temperature to the predicting unit 15A and the stability detecting unit 15B. The predicting unit 15A sequentially acquires the actually measured temperatures detected by the temperature measuring unit 11, takes in the actually measured temperatures at preset time points as prediction calculation data, performs predictive temperature measurement, and calculates the predicted temperature (S4). .

  When the predicted temperature is calculated, for example, several tens of seconds after the start of the temperature measurement, the prediction unit 15A sends the predicted temperature to the display unit 12 and causes the display unit 12 to display the predicted temperature (S5). At the same time, the control unit 15 drives the piezoelectric buzzer 16 to generate a buzzer sound for the completion of predicted temperature detection, for example, three times (S6). Thereby, the main body 10 notifies the user that the predicted temperature is displayed.

  On the other hand, when the switch 25 of the notification unit 20 is turned on, the sound collecting unit 21 starts sound collection (S21). And the determination part 23 starts the determination process of a spurious pattern (S22). Thereby, the spurious determination unit 23B determines that the three buzzer sounds generated in S6 have been detected (S23). Therefore, the determination unit 23 drives the notification unit 24 in accordance with the detection of the buzzer sound, and notifies the user that the buzzer sound indicating the completion of the predicted temperature detection has occurred in the main body 10 by vibration (S24).

  In the main body 10, the temperature measuring unit 11 continues to detect the temperature even after the predicted temperature detection is completed, and continues to send the detected actual temperature to the predicting unit 15A and the stability detecting unit 15B. For example, when the temperature measuring unit 11 approaches a thermal equilibrium state after several minutes from the start of the temperature measurement, the stability detecting unit 15B detects that the change in the detected temperature has reached the stable state (S7). At this time, the stability detecting unit 15B switches the predicted temperature displayed on the display unit 12 to the actually measured temperature, and displays the final actually measured temperature (S8). At the same time, the control unit 15 drives the piezoelectric buzzer 16 to generate a buzzer sound for the completion of the actual temperature measurement, for example, five times (S9). Thereby, the main body 10 notifies the user that the measured temperature is displayed.

  In the notification unit 20, the determination unit 23 continues the spurious pattern determination process even after the predicted temperature detection completion buzzer is detected (S <b> 25). Thereby, the spurious determination unit 23B determines that the five buzzer sounds generated in S9 have been detected (S26). Therefore, the determination unit 23 drives the notification unit 24 in accordance with the detection of the buzzer sound, and notifies the user that the buzzer sound for completion of the actual temperature measurement has occurred in the main body 10 by vibration (S27). The operation of the main body 10 and the notification unit 20 of the electronic thermometer 1 is thus completed.

  In the example shown in FIG. 1, the notification unit 20 is fitted into the end of the main body 10, but the notification unit may be a separate device from the main body 10. For example, if the notification unit is separated from the main body 10 so that it can be mounted on clothes, it will not be hidden under clothes even during use. It is possible to notify the user of the buzzer sound. Below, the example of the alerting | reporting unit (notification apparatus) isolate | separated from the main body 10 is demonstrated.

  FIG. 6 is an external view of the notification unit 40 that can be mounted on the clothes 50. The notification unit 40 includes a clip 41 and an LED 42. The functional block of the notification unit 40 is the same as that of the notification unit 20 shown in FIG.

  The clip 41 is for mounting the notification unit 40 on the user's clothes 50 or the like. Thereby, the alerting | reporting unit 40 is comprised so that attachment or detachment with respect to a user is the position which can be seen from a user also at the time of use of the electronic thermometer 1. FIG.

  The LED 42 is provided as a notification unit 24, and lights up when the buzzer sound of the piezoelectric buzzer 16 is detected, thereby notifying the user of the completion of temperature measurement of the electronic thermometer 1 by light. Note that the notification unit 40 may notify the user of the completion of the temperature detection by both light and vibration by using a vibrator as the notification unit 24 as in the notification unit 20. Or even if it is an information unit which can be installed in the position which can be seen from a user, it may notify by vibration like information unit 20 without providing LED42.

  Note that the notification unit is not limited to be worn on clothes, but may be configured to be detachable from the user, for example, in a shape that can be attached to the user's hand. Further, the notification unit may be used by being placed on a table near the user.

  Moreover, you may use portable terminals, such as a smart phone and a tablet terminal, as an alerting | reporting unit. For example, a smartphone has a microphone and a vibrator, and the function of the determination unit 23 can be realized by digital signal processing. Therefore, if the function of the determination unit 23 is configured as an application for a mobile terminal, the notification unit can also be realized by a mobile terminal. It is.

  Even when the notification unit is realized by a portable terminal, the functional blocks are the same as those of the notification unit 20 shown in FIG. For the sound collection unit 21, a microphone provided in the mobile terminal is used. Moreover, the alerting | reporting part 24 uses the vibrator with which the portable terminal was equipped, for example. When the buzzer sound of the piezoelectric buzzer 16 is detected, the notification unit 24 notifies the user of the completion of temperature measurement of the electronic thermometer 1 by vibrating the portable terminal.

  Note that, even in the notification unit 40 or the notification unit of the portable terminal, the notification unit 24 detects, for example, the first buzzer sound (when the predicted temperature detection is completed) for 5 seconds, when the second buzzer sound is detected (measured temperature detection completed). For example, when the LED 42 is turned on for 30 seconds, the vibration or the lighting duration or intensity of the LED may be changed depending on whether the operation is the first time or the second time.

  When the notification unit is configured as a device separate from the main body 10, the sensitivity of the sound collection unit 21 needs to be higher than that of the notification unit 20 fitted in the end of the main body 10. However, if the sensitivity of the sound collecting unit 21 is too high, for example, when a plurality of people are using the electronic thermometer at the same time in a hospital or the like, the buzzer sound of another person's electronic thermometer may be erroneously detected. In order to eliminate such erroneous detection, for example, when the notification unit 40 is attached to clothes, or when a portable terminal or the like functioning as the notification unit is placed in a pocket of clothes, The sensitivity of the sound collection unit 21 may be adjusted so that the buzzer sound that is emitted can be detected with the optimum sound pressure.

  As described above, in the electronic thermometer 1, the notification unit 20 detects the buzzer sound of the completion of the temperature measurement from the main body 10 used in the clothing based on the presence or absence of its own harmonics. Then, the notification unit 20 converts the buzzer sound into a different form that is more easily perceived and notifies the user. For this reason, even if the main body 10 is hidden under the clothes at the time of use, the user can more reliably identify the completion of the temperature detection by the vibration generated by the notification unit 20.

  In addition, each said alerting | reporting unit is applicable also to what does not have a prediction thermometry function, if it is an electronic thermometer which uses a piezoelectric buzzer.

DESCRIPTION OF SYMBOLS 1 Electronic thermometer 10 Main body 11 Temperature measuring part 15 Control part 16 Piezoelectric buzzer 20,40 Notification unit 21 Sound collecting part 23 Determination part 24 Notification part

Claims (5)

A temperature measuring unit for detecting the temperature of the measurement site;
A piezoelectric buzzer that emits a buzzer sound in response to completion of temperature detection by the temperature measuring unit;
The sound collection section;
A determination unit that determines whether or not a sound wave collected by the sound collection unit is a buzzer sound of the piezoelectric buzzer based on the presence or absence of harmonics unique to the buzzer sound;
An informing unit for informing that the buzzer sound of the piezoelectric buzzer is detected according to the determination result by the determining unit;
The electronic thermometer characterized by having.   When the level of the sound wave collected by the sound collection unit exceeds a predetermined threshold for the fundamental frequency and the harmonic frequency of the buzzer sound of the piezoelectric buzzer, the determination unit The electronic thermometer according to claim 1, wherein the electronic thermometer is determined to be the buzzer sound.   The electronic thermometer according to claim 1, wherein the notification unit notifies by vibration that a buzzer sound of the piezoelectric buzzer is detected.   The electronic device according to any one of claims 1 to 3, wherein the sound collection unit, the determination unit, and the notification unit are configured as a notification unit separated from a main body including the temperature measurement unit and the piezoelectric buzzer. Thermometer. The sound collection section;
A determination unit that determines whether or not the sound wave collected by the sound collection unit is a buzzer sound of a piezoelectric buzzer built in an electronic thermometer, based on the presence or absence of harmonics unique to the buzzer sound;
An informing unit for informing that a buzzer sound of the piezoelectric buzzer is detected according to a determination result of the determining unit;
A notification device comprising:

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