WO2019051725A1 - Call reminding method and call reminding system for intelligent terminal - Google Patents

Abstract

The invention provides a call reminding method and a call reminding system for an intelligent terminal, comprising the steps of: capturing an operation instruction, starting a call reminding system; sensing a distance between the smart terminal and a face; and when the smart terminal and the smart terminal When the distance between the faces is greater than a preset distance, monitoring the current intensity in the earpiece of the smart terminal; when the current intensity of the earpiece is greater than a preset current intensity, generating an alarm command, according to the alarm command, Controlling the smart terminal to send an alarm signal. The invention provides a convenient call reminding method and system, which saves the time for the user to wait for a call and has good market application value.

Description

Call reminding method and call reminding system of intelligent terminal Technical field

The present invention relates to the field of control of intelligent terminals, and in particular, to a call reminding method and a call reminding system for an intelligent terminal.

Background technique

With the development and advancement of technology, the development of intelligent terminals is also changing with each passing day. Intelligent terminals Currently, intelligent terminals have gradually penetrated into all aspects of people's lives because of their convenience and functionality, and have become an indispensable auxiliary equipment in people's lives. At the same time, with the diversification of the functionality of smart terminals, the convenience of the functions of smart terminals has become one of the user's choice factors.

In the actual application of the smart terminal, it often occurs during the call. Because one of the two parties temporarily interrupts the call due to an emergency, the other party needs to keep the answering state because the processing time of the emergency cannot be expected. In case one party suddenly resumes the call. In the above case, the user needs to keep on receiving the call state, and cannot get out of the work for other work, which causes great inconvenience to the user's actual application.

Summary of the invention

To solve the above problems, the present invention provides a method for calling a reminder of a smart terminal and a call reminding system. The invention utilizes a distance measuring module and a current monitoring module in the smart terminal to timely send a call reminder to the user by monitoring the distance between the face and the smart terminal and the current change in the earpiece of the smart terminal, so that the user can answer the call of the other party in time. content.

Specifically, an aspect of the present invention provides a method for calling a reminder of an intelligent terminal, comprising the steps of: capturing an operation instruction, starting a call reminding system; and sensing a distance between the smart terminal and a face; When the distance between the smart terminal and the face is greater than a preset distance, monitoring the current intensity in the earpiece of the smart terminal; when the current intensity of the earpiece is greater than a preset current intensity, generating an alarm command, according to The alarm instruction controls the smart terminal to send an alarm signal.

Preferably, in the above method, the step of sensing the distance between the smart terminal and the human face comprises: capturing a target image including a scene of the front end of the smart terminal screen, tracking the face information in the target image, and measuring a distance between the smart terminal and a face, wherein the distance is set when there is no face information in the target image From infinity.

Preferably, in the above method, the step of tracking the face information in the target image comprises: identifying a facial contour shape, a facial facial feature, a facial skin color, a facial skin texture in the target image, When there is at least a face skin color and a face skin texture in the target image, it is determined that the target image includes a face.

Preferably, the method further includes: when the smart terminal senses that the distance between the smart terminal and the human body is less than or equal to the preset distance, generating a stop alarm instruction, according to the stop alarm instruction, The intelligent terminal stops transmitting the alarm signal.

Preferably, in the above method, the alarm signal includes a sound signal, a flash signal or a vibration signal.

Another aspect of the present invention provides a reminder system for an intelligent terminal, which includes the following module, the startup module captures an operation instruction, activates a call reminding system according to the operation instruction, and the ranging module senses the smart terminal. a distance between the face and the face; the current monitoring module monitors the current intensity in the earpiece of the smart terminal, and when the current intensity of the earpiece is greater than a predetermined current intensity, generates an alarm command, and the alarm module according to the alarm And instructing the smart terminal to send an alarm signal.

Preferably, in the above system, the ranging module comprises: an image capturing unit, capturing a target image including a scene facing the screen of the smart terminal, a face tracking unit, tracking face information in the target image, and measuring The distance unit measures a distance between the smart terminal and a human face, wherein when the face image has no face information, the distance is set to infinity.

Preferably, in the above system, the face tracking unit includes a face recognition unit that recognizes a face facial contour shape, a facial facial feature position, a face skin color, and a face skin texture in the target image, wherein When there is at least a face skin color and a face skin texture in the target image, it is determined that the target image includes a face.

Preferably, the system further includes: an instruction module, when the smart terminal senses that the distance between the smart terminal and the human body is less than or equal to the preset distance, generating a stop alarm instruction; and an alarm control module And, according to the stop alarm instruction, the smart terminal stops sending the alarm signal.

Preferably, in the above system, the alarm module includes an audio unit that plays an audio signal according to the alarm instruction; a light unit that emits a flash signal according to the alarm instruction; or a vibration unit that issues according to the alarm instruction Vibration signal.

Compared with the prior art, the technical advantages of the present invention are:

1) The present invention utilizes tracking face information to know that the user is in a state of not receiving a call;

2) The invention utilizes monitoring the current in the earpiece of the intelligent terminal to know that the other party of the call is inputting voice;

3) The present invention provides a convenient call reminding method and system, which saves time for users to wait for a call and has good Market application value.

DRAWINGS

1 is a schematic flow chart of a call reminding method of a smart terminal according to a preferred embodiment of the present invention

2 is a schematic flow chart of the distance between the sensing intelligent terminal and the face in FIG. 1;

3 is a schematic flow chart of another method for calling a reminder of a smart terminal according to a preferred embodiment of the present invention;

4 is a structural diagram of a call reminding system of a smart terminal in accordance with a preferred embodiment of the present invention;

Figure 5 is a structural view of the ranging module of Figure 4;

FIG. 6 is a structural diagram of a call reminding system of a smart terminal according to another preferred embodiment of the present invention.

Detailed ways

The advantages of the present invention are explained in detail below with reference to the accompanying drawings and specific embodiments.

The following description refers to the same or similar elements in the different figures unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with aspects of the present disclosure as detailed in the appended claims.

First, it should be understood that although the terms first, second, third, etc. may be employed in the present disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, the first intelligent terminal may also be referred to as a second smart terminal without departing from the scope of the present disclosure. Similarly, the second smart terminal may also be referred to as a first smart terminal.

In the actual application of the smart terminal, it often occurs during the call. Because one of the two parties temporarily interrupts the call due to an emergency, the other party needs to keep the answering state because the processing time of the emergency cannot be expected. In case one party suddenly resumes the call. In the above case, the user needs to keep on receiving the call state, and cannot get out of the work for other work, which causes great inconvenience to the user's actual application. In order to solve the above problem, an aspect of the present invention provides a call reminding method for an intelligent terminal, which can monitor a voice situation when a party interrupts a call, and provide an alarm reminder to the user when the other party resumes the call, which brings the user a pole. Great convenience.

Specifically, referring to FIG. 1 , which is a schematic flowchart of a call reminding method of a smart terminal according to a preferred embodiment of the present invention. It can be seen from the figure that the call reminding method of the smart terminal provided by this embodiment mainly includes the following steps:

- Capture an operation command to activate the call reminder system

In this embodiment, when the user encounters an emergency event during the conversation, the other party encounters an emergency, but maintains the connection state, but interrupts the call with the user, and asks the user to wait for the resume call, the user can trigger the call reminding system of the smart terminal. The intelligent terminal is used to monitor the call status of the other party, and an alarm notification is sent to the user in time. Therefore, the startup module of the smart terminal may capture the operation instruction input by the user to the smart terminal, and after parsing the operation instruction, start the call reminding system of the smart terminal according to the operation instruction.

- sensing the distance between the smart terminal and the face

In this embodiment, after the call reminding system is activated, the ranging module of the call reminding system monitors the distance between the smart terminal and the face, and obtains a specific between the smart terminal and the face. The distance data is compared with a pre-stored pre-stored distance in the smart terminal, and a corresponding operation instruction is sent out according to the comparison result.

Referring to FIG. 2, it is a schematic flowchart of the distance between the sensing intelligent terminal and the human face in FIG. As can be seen from the figure, preferably, the distance between the sensing intelligent terminal and the face can be as follows:

Capturing a target image comprising a scene of the front end of the screen of the smart terminal

That is, after the call reminding system of the smart terminal is activated according to an instruction of the user, the camera unit in the call reminding system is activated in the background, and a front camera is captured by the front camera in the camera unit. A target image that can be included, that is, includes a scene to which the smart terminal screen faces.

- Tracking face information in the target image

In this embodiment, after the image capturing unit captures the target image, the face tracking unit in the smart terminal may search in the target image to scan face information in the target image. Preferably, in this embodiment, the final search object is set as a face information and the error range allowed by the search result is set by the face tracking unit by pre-compilation, so that when the face tracking unit is in the When the error in the target image and the preset face information is within a preset error range, it is considered that the corresponding face information is searched.

More preferably, in this embodiment, the step of tracking the face information in the target image comprises:

Identifying the facial features of the facial image, the facial features, the facial skin color, and the facial skin texture in the target image

More preferably, in the embodiment, the face tracking unit includes a face recognition unit, which can specifically identify the facial features including the facial features, the facial features, the facial skin color, and the person in the target image. a face information such as a face skin texture, but in the embodiment, when the face recognition unit searches for the presence of at least a face skin color and a face skin texture in the target image, determining the target image Contains human faces.

Preferably, in this embodiment, the specific searching step of the face recognition unit includes: 1) first establishing a person Face information file. That is, the camera unit collects a certain number of face images of the user's face in advance or forms an image file using the existing photos of the user, and uses the statistical principle to generate a faceprint code of the face; 2) acquire one Virtual face coding, that is, when the camera unit captures a target image, the scene in the current target image is processed in the same coding form to generate a virtual face code; 3) the virtual face code and file inventory are generated The face code is compared, and when there is a portion of the virtual face code that has a deviation from the pre-stored face code within a predetermined range, then a face is considered to exist in the target image. In this embodiment, when there is at least a face skin color and a face skin texture in the target image, it is determined that the target image includes a face.

- measuring the distance between the smart terminal and the face

With reference to FIG. 1 , in the embodiment, after the smart terminal tracks the face information in the target image, the distance measuring module in the smart terminal further measures the distance between the smart terminal and the face.

Preferably, referring to FIG. 2, in the embodiment, the ranging module includes a ranging unit, and the ranging unit includes a distance sensor, and the method for measuring time is used to acquire between the smart terminal and the human face. distance. Specifically, the distance sensor may emit an infrared ray that is irradiated onto a human face, and the skin of the human face generates a heat dissipation effect on the infrared ray, and the distance sensor further receives the emitted infrared ray reflected by the human skin. The distance sensor calculates the distance between the face and the smart terminal by the time difference between the infrared ray and the reflected infrared ray.

After the ranging module obtains the distance between the smart terminal and the human face, it compares with a preset distance, when the distance between the smart terminal and the human face is greater than the preset distance, The ranging module further generates a monitoring command and sends it out.

It should be understood that, in this embodiment, the face tracking unit does not search for the face information in the target image, and the distance between the face and the smart terminal is considered to be infinite, and thus, At this time, the ranging module will also generate a monitoring command.

Monitoring the current intensity in the earpiece of the smart terminal

With reference to FIG. 1, it can be seen that, in this embodiment, when the distance between the smart terminal and the face is greater than a preset distance, the current monitoring module in the smart terminal receives the one sent by the ranging module. Monitoring instructions, thereby monitoring the intensity of the current in the earpiece of the smart terminal.

The principle of the above design is that there are many types of mobile phone handsets, that is, mobile phone speakers, but the basic working principle is similar, and both are components for converting electrical signals into sound signals for playback. Currently the most widely used is the electric speaker, which consists of a diaphragm, a voice coil, a permanent magnet, a bracket, and the like. The working principle of the speaker is that when the voice coil of the speaker is connected to the audio current, the voice coil generates an alternating magnetic field under the action of current, and the permanent magnet also Produces a constant magnetic field of constant size and direction. Since the magnitude and direction of the magnetic field generated by the voice coil are constantly changing with the change of the audio current, the interaction of the two magnetic fields causes the voice coil to move in the direction of the current in the vertical chirp, connected by the voice coil and the diaphragm. Thereby, the vibrating membrane is driven to generate vibration, and the vibrating membrane vibrates to cause vibration of the air to emit sound. When the current input to the voice coil is larger, the force of the magnetic field is greater, the amplitude of the vibration of the diaphragm is greater, and the sound is more ambiguous. In the case of a call, the mobile phone microphone is used to convert the sound signal into an electrical signal for processing and storage, that is, the sound reproduction process with the mobile phone is reversed.

It can be seen that when the other party talking with the user has an audio transmission to the earpiece of the user's smart terminal, a large current change is received in the earpiece, so that the current monitoring module can monitor the current change in the earpiece of the smart terminal. To determine if the other party is inputting audio (speech) to their smart terminal. When the current monitoring module detects that a current intensity greater than a predetermined current intensity is generated in the earpiece of the smart terminal, an alarm command is generated and sent out.

- controlling the smart terminal to send an alarm signal according to the alarm instruction

With reference to FIG. 1 , in the embodiment, an intelligent module is further provided with an alarm module, and the alarm module can receive an alarm command sent by the current monitoring module, analyze and control the corresponding alarm unit according to the alarm instruction. Send the corresponding alarm information.

Preferably, the alarm module specifically includes an audio unit, a light unit, and/or a vibration unit. It can receive an appropriate alarm command and emit an audio signal, a flash signal, and/or a vibration signal.

It should be understood that the above alarm signals do not have to be sent separately. The user can preset one or more kinds of signal combination alarm signals and their specific alarm signal contents according to their own needs or preferences, such as the type of audio and the frequency of the flash. And / or the form of vibration, etc.

In addition, preferably, referring to FIG. 3, it is a schematic flowchart of another method for calling reminding of a smart terminal according to a preferred embodiment of the present invention. It can be seen from the figure that the call reminding method provided in this embodiment further includes a method step of ending the call reminding, which specifically includes:

- Generate a stop alarm command

In this embodiment, the smart terminal may stop the call reminding function after the user continues to answer the call. Specifically, when the user moves the smart terminal to be close to the face thereof, the ranging module of the smart terminal continues to monitor the distance from the smart terminal to the human face, and when the ranging module detects the smart terminal and the human body When the distance is less than or equal to the preset distance, an operation instruction is sent out, and an instruction module of the intelligent terminal receives and generates a stop alarm instruction according to the operation instruction, and sends the instruction to the outside.

- Stop sending the alarm signal.

Therefore, the alarm control module in the smart terminal can receive the stop alarm command, and control the alarm module in the smart terminal to stop sending the alarm signal, such as stopping playing music, stopping flashing lights, stopping vibrating intelligent terminals, etc. .

In summary, the present invention provides a method for calling a reminder of a smart terminal. When the user is interrupted by a call with another person and initiates a call reminder, the user is determined to place the smart terminal by sensing the distance between the smart terminal and the face. The distance of the other party's voice cannot be heard, and the other party who is talking to the user is continuously monitored by monitoring the current change in the earpiece, thereby issuing a call reminder to the user, so as to prevent the user from missing the other party's call content.

Another aspect of the present invention is to provide a call reminding system for a smart terminal. Referring to FIG. 4, it is a structural diagram of a call reminding system of a smart terminal in accordance with a preferred embodiment of the present invention. As can be seen from the figure, the call reminding system provided in this embodiment mainly includes the following structure:

-Start module

The startup module is configured to capture an operation instruction of a startup call reminding system input by the user to the smart terminal, and start the call reminding system according to the operation instruction.

In this embodiment, in order to prevent the call reminding system from being kept open, the user's misoperation may cause interference to the normal call of the user, so the startup module is set, and the user consciously activates the call reminding system according to his own needs, and the user is aware of the call reminding system. In the case of the working principle, it is possible to consciously avoid the occurrence of misoperations. On the other hand, when the call reminder system is activated when needed, the waste of the power of the smart terminal can be reduced.

-Ranging module

The ranging module can implement measuring a distance between the smart terminal and a human face.

Specifically, referring to FIG. 5, it is a structural diagram of the ranging module in FIG. As can be seen from the figure, the ranging module in the embodiment includes: an imaging unit, a face tracking unit, and a ranging unit. Its specific description is as follows:

- camera unit

At least one front camera is included, which is capable of capturing a target image that can be included by the front camera, that is, a scene including the face of the smart terminal screen.

- Face tracking unit

In this embodiment, the operation of the face tracking unit is to search for a preset face information in the target image, and when the target image is searched for an error with the preset face information, When the error range is preset, it is considered that the corresponding face information is searched.

Specifically, the face tracking unit includes a face recognition unit, and the face recognition unit can identify a facial contour shape, a facial feature position, and a human face in the target image. skin color, Human face skin texture. Preferably, in this embodiment, the specific searching step of the face recognition unit comprises: 1) first establishing a face information file. That is, the camera unit collects a certain number of face images of the user's face in advance or forms an image file using the existing photos of the user, and uses the statistical principle to generate a faceprint code of the face; 2) acquire one Virtual face coding, that is, when the camera unit captures a target image, the scene in the current target image is processed in the same coding form to generate a virtual face code; 3) the virtual face code and file inventory are generated The face code is compared, and when there is a portion of the virtual face code that has a deviation from the pre-stored face code within a predetermined range, then a face is considered to exist in the target image. In this embodiment, when there is at least a face skin color and a face skin texture in the target image, it is determined that the target image includes a face.

-Ranging unit

The distance between the smart terminal and the human face is measured. In the embodiment, when there is no face information in the target image, the distance is set to infinity. Therefore, when the user is guaranteed to leave the range of the front camera of the smart terminal, the smart terminal can normally send a call reminder.

Preferably, in the embodiment, the distance measuring unit comprises a distance sensor, and the working principle is: detecting the physical change amount of the object by using various components, and measuring the slave sensor by converting the change amount into a distance. The machine that shifts the distance to the object.

Preferably, the distance sensor may be one of an optical displacement sensor, a linear proximity sensor, an ultrasonic displacement sensor, and the like.

Optical displacement sensor (smart sensor ZX-L-N series, etc.): Light emitted by a light source is collected by a lens and irradiated onto an object. The reflected light from the object is concentrated by a light receiving lens onto a one-dimensional position detecting element (PSD)*. If the position of the object (distance from the measurer) changes, the imaging position on the PSD will be different; if the two output balances of the PSD change, the imaging position on the PSD will be different and the two output balances of the PSD will change again. If these two outputs are taken as A and B, and A/(A+B) is calculated, and the appropriate pull coefficient 'k' and residual error 'C' are added, the formula can be obtained as: displacement = A / (A +B)+K+C. The measured value is not the illuminance (brightness), but the displacement of the two outputs A and B. Therefore, even if the distance to the object to be measured changes, the amount of received light does not change, and the distance can be obtained. The differential, positional offset is proportional to the linear output.

Linear proximity sensor (smart sensor ZX-E series, etc.): If the coil is AC, it will generate magnetic flux. If it passes through the metal object, it will generate an eddy current in the object and emit magnetic flux to prevent this. Kind of change. As a result, the inductance of the coil changes. The amount of change in this induction is a function of the distance between the coil and the object, and as a result, the distance displacement of the object can be measured.

In the ultrasonic displacement sensor, the ultrasonic wave is transmitted from the wave transmitter to the object, and the reflected wave is received by the wave receiver. The way of calculating the distance by calculating the relationship between the time required for the ultrasonic wave from transmission to reception and the speed of sound.

Preferably, in the embodiment, the ranging unit includes an infrared distance sensor, and the distance between the smart terminal and the human face is obtained by using a measurement time method. Specifically, the infrared distance sensor may emit an infrared ray, and the infrared ray is irradiated onto a human face, and the skin of the human face generates a heat dissipation effect on the infrared ray, and the infrared distance sensor further receives the emission reflected by the human skin. infrared. The infrared distance sensor calculates the distance between the face and the smart terminal by the time difference between the infrared ray and the reflected infrared ray.

- Current monitoring module

The utility model is configured to monitor a current intensity in the earpiece of the smart terminal, and generate an alarm command when a current intensity of the earpiece is greater than a preset current intensity. Specifically, when the other party talking to the user has an audio transmission to the earpiece of the user's smart terminal, a large current change is received in the earpiece, so that the current monitoring module can monitor the current in the earpiece of the smart terminal. Change to determine if the other party is inputting audio (speech) to their smart terminal. When the current monitoring module detects that a current intensity greater than a predetermined current intensity is generated in the earpiece of the smart terminal, an alarm command is generated and sent out.

- alarm module

The alarm module may control the smart terminal to send an alarm signal according to the alarm instruction.

Preferably, the alarm module specifically includes an audio unit, a light unit, and/or a vibration unit. It can receive a corresponding alarm command and emit an audio signal, a flash signal, and/or a vibration signal accordingly.

In addition, referring to FIG. 6, which is a structural diagram of a call reminding system of a smart terminal according to another preferred embodiment of the present invention. It can be seen from the figure that, in order to implement the instant stop smart terminal to continuously send the call reminding notification, the call reminding system of the embodiment further includes the following modules:

- instruction module

When the smart terminal senses that the distance between the smart terminal and the human body is less than or equal to the preset distance, the instruction module may receive an operation instruction sent by the ranging module, and according to the operation instruction Generate a stop alarm command and send it out.

- Alarm Control Module

The alarm control module controls, according to the stop alarm instruction, each specific alarm unit in the intelligent terminal, such as an audio unit, a light unit, and/or a vibration unit, to stop transmitting the alarm signal.

The invention utilizes the tracking face information to know that the user is in the state of not answering the phone; the invention uses the current in the earpiece of the monitoring intelligent terminal to know that the other party of the call is inputting the voice; the invention provides a convenient call reminding method and system, saving The time the user waits for a call has good market application value.

It should be noted that the embodiments of the present invention are preferred embodiments, and are not intended to limit the scope of the present invention. Any one skilled in the art may use the above-disclosed technical contents to change or modify the equivalent embodiments. Any modification or equivalent changes and modifications of the above embodiments in accordance with the technical spirit of the present invention are still within the scope of the technical solutions of the present invention.

Claims (10)

A method for calling a reminder of a smart terminal, comprising the steps of: Capture an operation command to activate the call reminding system; Sensing a distance between the smart terminal and a human face; Monitoring the current intensity in the earpiece of the smart terminal when the distance between the smart terminal and the face is greater than a preset distance; Generating an alarm command when the current intensity of the earpiece is greater than a predetermined current intensity, And controlling, according to the alarm instruction, the smart terminal to send an alert signal. The method of claim 1 wherein The step of sensing the distance between the smart terminal and the face includes: Capturing a target image including a scene of a front end of the screen of the smart terminal, Tracking face information in the target image, Measuring the distance between the smart terminal and the face, Wherein, when there is no face information in the target image, the distance is set to infinity. The method of claim 2 wherein The step of tracking the face information in the target image includes, Identifying a facial features, a facial features, a facial skin color, and a facial skin texture in the target image, When there is at least a face skin color and a face skin texture in the target image, it is determined that the target image includes a face. The method of claim 1 wherein Also includes, When the smart terminal senses that the distance between the smart terminal and the human body is less than or equal to the preset distance, generating a stop alarm instruction, And controlling, according to the stop alarm instruction, the smart terminal to stop sending the alarm signal. The method of claim 1 wherein The alarm signal includes a sound signal, a flash signal, or a vibration signal. A call reminding system for an intelligent terminal, comprising the following modules, Starting a module, capturing an operation instruction, and starting a call reminding system according to the operation instruction; a ranging module that senses a distance between the smart terminal and a human face; a current monitoring module monitors a current intensity in the earpiece of the smart terminal, and generates an alarm command when the current intensity of the earpiece is greater than a preset current intensity, The alarm module controls the smart terminal to send an alarm signal according to the alarm instruction. A pass reminder system according to claim 6, wherein The ranging module includes a camera unit that captures a target image including a scene facing the screen of the smart terminal, a face tracking unit that tracks face information in the target image, The ranging unit measures a distance between the smart terminal and a human face, wherein when the target image has no face information, the distance is set to infinity. A pass reminder system according to claim 7, wherein The face tracking unit includes a face recognition unit that recognizes a facial features, a facial features, a facial skin color, and a facial skin texture in the target image, Wherein, when there is at least a face skin color and a face skin texture in the target image, it is determined that the target image includes a human face. A pass reminder system according to claim 6, wherein Also includes, An instruction module, when the smart terminal senses that the distance between the smart terminal and the human body is less than or equal to the preset distance, generating a stop alarm instruction, An alarm control module stops the sending of the alarm signal according to the stop alarm command. A pass reminder system according to claim 6, wherein The alarm module includes An audio unit that plays an audio signal according to the alarm instruction, a lighting unit that emits a flash signal according to the warning command, or The vibration unit emits a vibration signal according to the alarm command.

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