Device for eliminating noise misjudgment and household appliance

Abstract

The present invention discloses a device for eliminating noise misjudgment and a household appliance. The device includes: at least one first piezoelectric sensor adapted to be mounted on a detection component of a carrier and used for detecting a tapping event applied to the carrier; at least one second piezoelectric sensor adapted to be mounted on a non-detection component of the carrier and used for detecting a tapping event applied to the carrier; and a control circuit board adapted to communicate with the first piezoelectric sensor and the second piezoelectric sensor to compare a first detection signal output by the first piezoelectric sensor with a second detection signal output by the second piezoelectric sensor to determine whether the tapping event comes from the detection component. The device disclosed herein can conveniently and accurately identify whether a tapping event occurs in a specified area (for example, the detection component), and has a simple structure and low cost.

Description

Technical Field

[0001] The present invention relates to the field of touch detection, and more particularly, to a device and a household appliance for eliminating noise misjudgment. Background Art

[0002] In order to increase the convenience of operating devices and household appliances, touching or tapping a surface with a finger is a relatively intuitive and convenient way of human-computer interaction. The commonly used capacitive touch screen is relatively mature. However, when the touch range is relatively large, such as using the entire door of a washing machine or a refrigerator as an input surface, its cost is high. At the same time, because it changes the capacitance value by contact, it cannot distinguish the touch force and the touch material, and any conductive material contact can trigger it, which will cause many false triggers. When the use scenario is defined as the user using a finger part such as a joint or a fingertip to tap a specific surface of the device as an input command to achieve some simple operations. For example, double-tapping the refrigerator door to turn on the internal light of the refrigerator, tapping the dishwasher door to open the dishwasher, or double-tapping to turn on the washing machine drum light, and triple-tapping to open the washing machine door. Currently, there are also solutions that use a microphone to detect sound signals or an acceleration sensor to detect vibration signals. In the solution of using a microphone to detect sound signals, since a closed sound cavity needs to be formed, the installation is very troublesome and the cost is relatively high. In the solution of using an acceleration sensor to detect vibration, since the acceleration sensor needs to be SMT (Surface Mount Technology, that is, surface mount technology) on the circuit board, and the acceleration sensor needs to be close to the vibration surface. When the surface to be tapped is transparent, such as glass, it is very difficult to hide this circuit board, which poses a great challenge to the appearance design.

[0003] In practical applications, there is often a need that the user may need to tap in the detection area to have a response and there is no response outside the specified area. The prior art is to install a piezoelectric sensor on the detection area. If a tap occurs, the sensor will generate a response signal. However, in general, the detection area and the non-detection area are coupled together, so that the tap event occurring in the non-detection area will also be transmitted to the sensor in the detection area, which may cause the sensor to misjudge the tap event in the non-detection area as a tap event in the detection area. Summary of the Invention

[0004] An object of the present invention aims to solve at least one of the above problems and defects existing in the prior art.

[0005] According to one aspect of the present invention, there is provided a device for eliminating noise misjudgment, including:

[0006] At least one first piezoelectric sensor, adapted to be mounted on a detection component of a carrier, for detecting a tapping event applied to the carrier;

[0007] At least one second piezoelectric sensor, adapted to be mounted on a non-detection component of the carrier, for detecting a tapping event applied to the carrier; and

[0008] A control circuit board, adapted to communicate with the first piezoelectric sensor and the second piezoelectric sensor, to compare a first detection signal output by the first piezoelectric sensor with a second detection signal output by the second piezoelectric sensor, to determine whether the tapping event comes from the detection component.

[0009] According to an exemplary embodiment of the present invention, the control circuit board includes:

[0010] A signal conditioning circuit, adapted to process the first detection signal and the second detection signal respectively, to generate a first recognizable signal corresponding to the first detection signal and a second recognizable signal corresponding to the second detection signal; and

[0011] A controller, adapted to compare the first recognizable signal with the second recognizable signal, to determine whether the tapping event comes from the detection component.

[0012] According to another exemplary embodiment of the present invention, the control circuit board includes:

[0013] A first signal conditioning circuit, adapted to process the first detection signal, to generate a first recognizable signal corresponding to the first detection signal;

[0014] A second signal conditioning circuit, adapted to process the second detection signal, to generate a second recognizable signal corresponding to the second detection signal; and

[0015] A controller, adapted to compare the first recognizable signal with the second recognizable signal, to determine whether the tapping event comes from the detection component.

[0016] According to another exemplary embodiment of the present invention, being adapted to compare the first recognizable signal with the second recognizable signal, to determine whether the tapping event comes from the detection component further includes:

[0017] In the case where the amplitude of the first recognizable signal is greater than the amplitude of the second recognizable signal, determining that the tapping event comes from the detection component.

[0018] According to another exemplary embodiment of the present invention, the controller is further adapted to:

[0019] Record a first reception time when the first detection signal is received;

[0020] Record a second reception time when the second detection signal is received; and

[0021] When the first reception time is earlier than the second reception time and the amplitude of the first recognizable signal is greater than the amplitude of the second recognizable signal, determine that the tapping event comes from the detection component.

[0022] According to another exemplary embodiment of the present invention, when it is determined that the tapping event comes from the detection component, the control circuit board is further adapted to:

[0023] Determine the number of taps in the tapping event;

[0024] Generate an action instruction corresponding to the number of taps.

[0025] According to another exemplary embodiment of the present invention, the first piezoelectric sensor and / or the second piezoelectric sensor is a piezoelectric thin film sensor or a piezoelectric ceramic sensor.

[0026] According to another aspect of the present invention, there is provided a household appliance for eliminating noise misjudgment, including:

[0027] A touch door;

[0028] A cabinet body adapted to be coupled to the touch door;

[0029] At least one first piezoelectric sensor adapted to be mounted on the touch door for detecting a tapping event applied to the touch door and the cabinet body;

[0030] At least one second piezoelectric sensor adapted to be mounted on the cabinet body for detecting a tapping event applied to the cabinet body and the touch door; and

[0031] A control circuit board adapted to communicate with the first piezoelectric sensor and the second piezoelectric sensor to compare a first detection signal output by the first piezoelectric sensor with a second detection signal output by the second piezoelectric sensor to determine whether the tapping event comes from the touch door.

[0032] According to an exemplary embodiment of the present invention, the control circuit board includes:

[0033] A signal conditioning circuit adapted to process the first detection signal and the second detection signal respectively to generate a first recognizable signal corresponding to the first detection signal and a second recognizable signal corresponding to the second detection signal; and

[0034] A controller, adapted to compare the first recognizable signal with the second recognizable signal to determine whether the tapping event comes from the touch door.

[0035] According to another exemplary embodiment of the present invention, the control circuit board includes:

[0036] A first signal conditioning circuit, adapted to process the first detection signal to generate a first recognizable signal corresponding to the first detection signal;

[0037] A second signal conditioning circuit, adapted to process the second detection signal to generate a second recognizable signal corresponding to the second detection signal; and

[0038] A controller, adapted to compare the first recognizable signal with the second recognizable signal to determine whether the tapping event comes from the touch door.

[0039] According to another exemplary embodiment of the present invention, further including comparing the first recognizable signal with the second recognizable signal to determine whether the tapping event comes from the touch door:

[0040] When the amplitude of the first recognizable signal is greater than the amplitude of the second recognizable signal, it is determined that the tapping event comes from the touch door.

[0041] According to another exemplary embodiment of the present invention, the controller is further adapted to:

[0042] Record the first reception time when the first detection signal is received;

[0043] Record the second reception time when the second detection signal is received; and

[0044] When the first reception time is earlier than the second reception time and the amplitude of the first recognizable signal is greater than the amplitude of the second recognizable signal, it is determined that the tapping event comes from the touch door.

[0045] According to another exemplary embodiment of the present invention, when it is determined that the tapping event comes from the touch door, the control circuit board is further adapted to:

[0046] Determine the number of taps in the tapping event;

[0047] Generate an action instruction corresponding to the number of taps.

[0048] According to another exemplary embodiment of the present invention, the first piezoelectric sensor and / or the second piezoelectric sensor is a piezoelectric film sensor or a piezoelectric ceramic sensor.

[0049] According to another exemplary embodiment of the present invention, the household appliance further comprises:

[0050] A buffer member, adapted to be disposed between the touch door and the cabinet body, for achieving a sealed isolation between the touch door and the cabinet body.

[0051] In each of the foregoing exemplary embodiments of the present invention, the disclosed device and household appliance for eliminating noise misjudgment have a simple structure, are easy to install, and can use the vibration signal directly detected in a non-detection area (for example, non-detection components, cabinet body, etc.) as a quantization error signal, to compare the effective vibration signal in the detection area with the quantization error signal to determine whether a knocking event is valid, thereby greatly reducing the misjudgment rate of knocking event detection.

[0052] Through the description of the present invention with reference to the accompanying drawings hereinafter, other objects and advantages of the present invention will become apparent and can help to fully understand the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In conjunction with the accompanying drawings and with reference to the following detailed description, the features, advantages and other aspects of the embodiments of the present disclosure will become more apparent. Several embodiments of the present disclosure are shown herein in an illustrative rather than restrictive manner. In the drawings:

[0054] Figure 1 Is a schematic diagram of a device for eliminating noise misjudgment according to the present invention;

[0055] Figure 2 Is a schematic diagram of a household appliance for eliminating noise misjudgment according to the present invention;

[0056] Figure 3 Is a schematic diagram of a control circuit board according to the present invention; and

[0057] Figure 4 Is according to the present invention Figure 3 Flowchart of the controller of the control circuit board in the present invention for judging a knocking event. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0058] The technical solutions of the present invention will be further specifically described below through embodiments in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation of the present invention.

[0059] As used herein, the terms "comprising", "including" and similar terms should be understood as open-ended terms, i.e., "including / including but not limited to", indicating that other contents may also be included. The term "based on" means "at least partially based on". The term "an embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment", and so on.

[0060] Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the specification. For the connections between the units in the drawings, it is only for the convenience of illustration, which indicates that at least the units at both ends of the connection communicate with each other, and it is not intended to limit that the units without connection cannot communicate.

[0061] The present invention mainly focuses on the following technical problems: Existing household appliances usually use piezoelectric materials to judge the tapping operation of users. However, since piezoelectric materials can receive signals generated by any vibration, in order to avoid such interference or misjudgment, software methods for setting some trigger thresholds are usually set in the control configuration to solve the above problems to a certain extent. However, in actual applications, if a very large vibration occurs in the non-detection area, it will still cause misjudgment of the detection area.

[0062] To solve the above problems, according to a general concept of the present invention, there is provided a device for eliminating noise misjudgment, including: at least one first piezoelectric sensor adapted to be mounted on a detection component of a carrier and used to detect a tapping event applied to the carrier, at least one second piezoelectric sensor adapted to be mounted on a non-detection component of the carrier and used to detect a tapping event applied to the carrier, and a control circuit board adapted to communicate with the first piezoelectric sensor and the second piezoelectric sensor to compare a first detection signal output by the first piezoelectric sensor with a second detection signal output by the second piezoelectric sensor to determine whether the tapping event comes from the detection component. The present invention improves the effective detection of the vibration signal of the detection component by installing piezoelectric sensors on the detection component and the non-detection component respectively to compare the detection signals output by different piezoelectric sensors.

[0063] Embodiment 1

[0064] Figure 1 An exemplary schematic diagram of a device for eliminating noise misjudgment is shown. The device disclosed herein can generally be applied to devices that achieve specific operations through user tapping, such as various devices and machines such as household appliances and experimental equipment. In this embodiment, the device includes: a first piezoelectric sensor 100, a second piezoelectric sensor 200, and a control circuit board ( Figure 1(not shown in the figure). Among them, the first piezoelectric sensor 100 is adapted to be mounted on the detection component 10 for detecting a knocking event applied to the detection component 10 and the non-detection component 20 coupled to the detection component 10; the second piezoelectric sensor 200 is adapted to be mounted on the non-detection component 20 for detecting a knocking event applied to the non-detection component 20 and the detection component 10; the control circuit board is adapted to communicate with the first piezoelectric sensor 100 and the second piezoelectric sensor 200 to compare the first detection signal output by the first piezoelectric sensor 100 with the second detection signal output by the second piezoelectric sensor 200 to determine whether the knocking event comes from the detection component 10.

[0065] In this embodiment, the first piezoelectric sensor 100 and the second piezoelectric sensor 200 can be piezoelectric film sensors or piezoelectric ceramic sensors. When a solid plane (for example, the detection component 10 and / or the non-detection component 20) is knocked, a mechanical wave will be generated on the solid plane. When the mechanical wave propagates on the solid plane, the piezoelectric film sensor or piezoelectric ceramic sensor (for example, the first piezoelectric sensor 100 or the second piezoelectric sensor 200) mounted on it will generate charges due to pressure, and whether there is a knocking event on the solid plane is sensed by measuring the charges of the piezoelectric film sensor or piezoelectric ceramic sensor.

[0066] In this embodiment, the detection component 10 can be a circular panel, a square panel, a curved panel or a panel with a shape required for actual applications, and the material of the detection component 10 can be glass, stainless steel or wood, etc.

[0067] As Figure 3 shown, the control circuit board 300 includes: a signal conditioning circuit 310 and a controller 320; among them, the signal conditioning circuit 310 is adapted to process the first detection signal and the second detection signal respectively to generate a first recognizable signal corresponding to the first detection signal and a second recognizable signal corresponding to the second detection signal; the controller 320 is adapted to compare the first recognizable signal with the second recognizable signal to determine whether the knocking event comes from the detection component.

[0068] In this embodiment, both the first recognizable signal and the second recognizable signal can be pulse voltage signals that can be recognized by the controller 320.

[0069] Specifically, after the controller 320 receives the first recognizable signal and the second recognizable signal, when the amplitude of the first recognizable signal is greater than the amplitude of the second recognizable signal, the controller 320 determines that the knocking event comes from the detection component 10. In other cases, the controller 320 determines that the knocking event is invalid or comes from the non-detection component 20.

[0070] Since the detection component 10 (i.e., the detection area) and the non-detection component 20 (i.e., the non-detection area) are coupled together via a connecting member 30 (such as a screw, a stud, etc.), when a tapping event occurs on the detection component 10, the vibration generated on the detection component 10 will attenuate when it propagates to the non-detection component 20 via the connecting member 30. That is, the vibration amplitude sensed by the first piezoelectric sensor 100 is greater than the vibration amplitude sensed by the second piezoelectric sensor 200. Similarly, when a tapping event occurs on the non-detection component 20, the vibration generated on the non-detection component 20 will attenuate when it propagates to the detection component 10 via the connecting member 30. That is, the vibration amplitude received by the second piezoelectric sensor 200 is greater than the vibration amplitude received by the first piezoelectric sensor 100. That is to say, based on the comparison between the first detection signal output by the first piezoelectric sensor 100 and the second detection signal output by the second piezoelectric sensor 200, the actual occurrence area of the tapping event can be accurately determined.

[0071] The device disclosed in this embodiment can respectively detect the first detection signal and the second detection signal corresponding to the tapping event on the detection component 10 and the non-detection component 20, and determine the actual occurrence area of the tapping event by comparing the amplitudes of the first detection signal and the second detection signal, thus realizing an effective judgment of the vibration of the detection area (i.e., the detection component 10).

[0072] Embodiment 2

[0073] Figure 2 An exemplary schematic diagram of a household appliance for eliminating noise misjudgment is shown. In this embodiment, the household appliance is preferably a washing machine, which includes: a touch door 210, a cabinet 220, a first piezoelectric sensor 100, a second piezoelectric sensor 200, and a control circuit board ( Figure 2 not shown in the figure). Among them, the cabinet 220 is adapted to be coupled with the touch door 210; the first piezoelectric sensor 100 is adapted to be mounted on the touch door 210 for detecting tapping events applied to the touch door 210 and the cabinet 220; the second piezoelectric sensor 200 is adapted to be mounted on the cabinet 220 for detecting tapping events applied to the cabinet 220 and the touch door 210; and the control circuit board is adapted to communicate with the first piezoelectric sensor 100 and the second piezoelectric sensor 200 to compare the first detection signal output by the first piezoelectric sensor 100 with the second detection signal output by the second piezoelectric sensor 200 to determine whether the tapping event comes from the touch door 210.

[0074] In this embodiment, a buffer member is provided between the cabinet 220 and the touch door 210 ( Figure 2(not shown in the figure). Specifically, a buffer member (e.g., a rubber member, etc.) is used between the touch door and the cabinet body of the washing machine to achieve the sealed contact between the touch door and the cabinet body, preventing the leakage of liquid during the operation of the washing machine; and a connecting member (e.g., a screw, a stud, etc.) is used between the touch door and the cabinet body of the washing machine to achieve the coupling between the two. This configuration makes the vibration signals of the knocking events occurring on the touch door 210 or the cabinet body 220 sensed by the first piezoelectric sensor 100 and the second piezoelectric sensor 200 more different. That is, when the disclosed technical solution includes a buffer member, this technical solution can more accurately determine whether the occurring knocking event comes from the touch door 210.

[0075] In addition, in this embodiment, the first piezoelectric sensor 100 and the second piezoelectric sensor 200 are preferably piezoelectric film sensors or piezoelectric ceramic sensors. At the same time, based on the specific structure or actual application scenario of the household appliance, a plurality of first piezoelectric sensors 100 can also be arranged on the touch door 210, and a plurality of second piezoelectric sensors 200 can be arranged on the cabinet body 220 to improve the accuracy of knocking detection.

[0076] In this embodiment, Figure 2 the control circuit board not shown in the figure has the same function and structure as the Figure 3 control circuit board 300 described in Embodiment 1, and will not be elaborated here.

[0077] In addition, the control circuit board in this embodiment alternatively may include two signal conditioning circuits (e.g., a first signal conditioning circuit, a second signal conditioning circuit). Among them, the first signal conditioning circuit is used to receive the first detection signal output by the first piezoelectric sensor 100, and the second signal conditioning circuit is used to receive the second detection signal output by the second piezoelectric sensor 200, so that the first signal conditioning circuit and the second signal conditioning circuit respectively process the first detection signal and the second detection signal to generate a first recognizable signal corresponding to the first detection signal and a second recognizable signal corresponding to the second detection signal.

[0078] In this embodiment, the controller in the control circuit board can not only adopt the technical solution in Embodiment 1 to realize how to determine whether the knocking event comes from the touch door, but also adopt the Figure 4 way shown in the figure to achieve this purpose, specifically as follows:

[0079] Step 410: Record the first reception time T of receiving the first detection signal a .

[0080] Step 420: Record the second reception time T of receiving the second detection signal b .

[0081] Step 430: Receive a first recognizable signal and a second recognizable signal.

[0082] Step 440: Determine whether the first reception time T a is earlier than the second reception time T b .

[0083] Step 450: When it is determined that the first reception time T a is earlier than the second reception time T b , compare the first recognizable signal with the second recognizable signal.

[0084] Generally, since the first piezoelectric sensor 100 and the second piezoelectric sensor 200 are respectively mounted on the touch door 210 and the cabinet body 220, and the touch door 210 and the cabinet body 220 are coupled via a connecting member, and a sealing interval is maintained between them by using a buffer member, when a knocking event occurs on the touch door 210, the first piezoelectric sensor 100 receives the detection signal prior to the second piezoelectric sensor 200.

[0085] Step 460: Determine whether the amplitude V of the first recognizable signal a is greater than the amplitude V of the second recognizable signal b .

[0086] Step 470: When it is determined that the amplitude V of the first recognizable signal a is greater than the amplitude V of the second recognizable signal b , determine that the knocking event comes from the touch door.

[0087] In this embodiment, for the above reasons, when a knocking event occurs on the touch door 210, the mechanical wave vibration sensed by the first piezoelectric sensor 100 is significantly stronger than the mechanical wave vibration sensed by the second piezoelectric sensor 200. That is, when the amplitude V of the first recognizable signal a is greater than the amplitude V of the second recognizable signal b , it indicates that the knocking event occurs on the touch door 210.

[0088] In this embodiment, the order of steps 410 - 430 is not limited to this, and steps 410 - 430 can be executed in other orders (for example, simultaneously). In addition, the comparison of the reception time and the recognizable signal in steps 440 and 460 can be carried out simultaneously or in other orders.

[0089] The household appliance disclosed in this embodiment for eliminating noise misjudgment can effectively eliminate noise misjudgment for (for example, the cabinet body 220), and improve the user experience during the use of the household appliance.

[0090] Embodiment 3

[0091] Figure 2 An exemplary schematic diagram of a household appliance for eliminating noise misjudgment is shown. In this embodiment, the structure of the household appliance has been described in detail in Embodiment 2 and will not be elaborated here.

[0092] In this embodiment, the disclosed household appliance can either be based on the working principles of the first piezoelectric sensor 100, the second piezoelectric sensor 200, and the control circuit board in Embodiment 1, or utilize the working principles of the first piezoelectric sensor 100, the second piezoelectric sensor 200, and the control circuit board in Embodiment 2 (as Figure 4 shown), to achieve a correct judgment on whether the knocking event comes from the touch door 210, which will not be elaborated here.

[0093] In this embodiment, when Figure 3 the control circuit board 300 in determines that the knocking event comes from the touch door 210, the control circuit board 300 can also perform the following operations:

[0094] First, determine the number of knocks in the knocking event.

[0095] Second, generate an action instruction corresponding to the number of knocks.

[0096] For example, within the first predetermined knocking time period, when the control circuit board 300 determines that the number of knocks in the knocking event is single, it generates an action instruction corresponding to a single knock, for example, the light display on the working panel of the washing machine. Within the second predetermined knocking time period, when the control circuit board 300 determines that the number of knocks in the knocking event is double, it generates an action instruction corresponding to a double knock, for example, opening the touch door of the washing machine. Within the third predetermined knocking time period, when the control circuit board 300 determines that the number of knocks in the knocking event is triple, it generates an action instruction corresponding to a triple knock, for example, turning on the barrel light of the washing machine.

[0097] The household appliance disclosed in this embodiment, on the one hand, can greatly reduce the misjudgment rate of knocking events, and on the other hand, can issue corresponding action instructions based on the number of knocks to control the household appliance to perform corresponding actions; making the disclosed household appliance have more intelligent and user-friendly service functions and improving user satisfaction.

[0098] The above are only optional embodiments of the present disclosure and are not used to limit the embodiments of the present disclosure. For those skilled in the art, the embodiments of the present disclosure can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present disclosure shall be included within the protection scope of the embodiments of the present disclosure.

[0099] Although embodiments of the present disclosure have been described with reference to several specific embodiments, it should be understood that the embodiments of the present disclosure are not limited to the specific embodiments disclosed. The embodiments of the present disclosure are intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. The scope of the appended claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A device for eliminating noise misjudgment, characterized in that, The device includes: at least one first piezoelectric sensor adapted to be mounted on a detection component of a carrier for detecting a tapping event applied to the carrier, wherein the carrier includes the detection component and a non-detection component, and the detection component and the non-detection component are coupled via a connection member; at least one second piezoelectric sensor adapted to be mounted on the non-detection component for detecting a tapping event applied to the carrier; and a control circuit board adapted to communicate with the first piezoelectric sensor and the second piezoelectric sensor to compare a first detection signal output by the first piezoelectric sensor with a second detection signal output by the second piezoelectric sensor to determine whether the tapping event comes from the detection component; wherein the control circuit board includes: a signal conditioning circuit adapted to process the first detection signal and the second detection signal respectively to generate a first recognizable signal corresponding to the first detection signal and a second recognizable signal corresponding to the second detection signal; and a controller adapted to compare the first recognizable signal with the second recognizable signal to determine whether the tapping event comes from the detection component; wherein comparing the first recognizable signal with the second recognizable signal to determine whether the tapping event comes from the detection component further includes: determining that the tapping event comes from the detection component when the amplitude of the first recognizable signal is greater than the amplitude of the second recognizable signal.

2. The device according to claim 1, characterized in that The control circuit board includes: a first signal conditioning circuit adapted to process the first detection signal to generate a first recognizable signal corresponding to the first detection signal; a second signal conditioning circuit adapted to process the second detection signal to generate a second recognizable signal corresponding to the second detection signal; and a controller adapted to compare the first recognizable signal with the second recognizable signal to determine whether the tapping event comes from the detection component.

3. The device according to claim 1 or 2, characterized in that, The controller is further adapted to: record a first reception time when the first detection signal is received; record a second reception time when the second detection signal is received; and determine that the tapping event comes from the detection component when the first reception time is earlier than the second reception time and the amplitude of the first recognizable signal is greater than the amplitude of the second recognizable signal.

4. The device according to claim 1, characterized in that When it is determined that the tapping event comes from the detection component, the control circuit board is further adapted to: determine the number of taps in the tapping event; generate an action instruction corresponding to the number of taps.

5. The device according to claim 1, characterized in that, The first piezoelectric sensor and / or the second piezoelectric sensor is a piezoelectric film sensor or a piezoelectric ceramic sensor.

6. An appliance for eliminating noise misjudgment, characterized in that, The household appliance includes: a touch door; a cabinet body adapted to be coupled to the touch door; at least one first piezoelectric sensor adapted to be mounted on the touch door for detecting a knocking event applied to the touch door and the cabinet body; at least one second piezoelectric sensor adapted to be mounted on the cabinet body for detecting a knocking event applied to the cabinet body and the touch door; and a control circuit board adapted to communicate with the first piezoelectric sensor and the second piezoelectric sensor to compare a first detection signal output by the first piezoelectric sensor with a second detection signal output by the second piezoelectric sensor to determine whether the knocking event comes from the touch door; wherein, the control circuit board includes: a signal conditioning circuit adapted to process the first detection signal and the second detection signal respectively to generate a first recognizable signal corresponding to the first detection signal and a second recognizable signal corresponding to the second detection signal; and a controller adapted to compare the first recognizable signal with the second recognizable signal to determine whether the knocking event comes from the touch door; wherein, being adapted to compare the first recognizable signal with the second recognizable signal to determine whether the knocking event comes from the touch door further includes: determining that the knocking event comes from the touch door when the amplitude of the first recognizable signal is greater than the amplitude of the second recognizable signal.

7. The household appliance according to claim 6, wherein, The control circuit board includes: a first signal conditioning circuit adapted to process the first detection signal to generate a first recognizable signal corresponding to the first detection signal; a second signal conditioning circuit adapted to process the second detection signal to generate a second recognizable signal corresponding to the second detection signal; and a controller adapted to compare the first recognizable signal with the second recognizable signal to determine whether the knocking event comes from the touch door.

8. The household appliance according to claim 6 or 7, characterized in that, The controller is further adapted to: record a first reception time when the first detection signal is received; record a second reception time when the second detection signal is received; and determine that the knocking event comes from the touch door when the first reception time is earlier than the second reception time and the amplitude of the first recognizable signal is greater than the amplitude of the second recognizable signal.

9. The household appliance according to claim 6, characterized in that, When it is determined that the knocking event comes from the touch door, the control circuit board is further adapted to: determine the number of knocks in the knocking event; generate an action instruction corresponding to the number of knocks.

10. The household appliance according to claim 6, characterized in that, The first piezoelectric sensor and / or the second piezoelectric sensor is a piezoelectric film sensor or a piezoelectric ceramic sensor.

11. The household appliance according to claim 6, characterized in that, The household appliance further includes: a buffer member adapted to be disposed between the touch door and the cabinet body for achieving a sealed isolation between the touch door and the cabinet body.

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