CN112731406B - Method, device, storage medium and processor for identifying interference signals - Google Patents
Method, device, storage medium and processor for identifying interference signals Download PDFInfo
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- CN112731406B CN112731406B CN202011554168.9A CN202011554168A CN112731406B CN 112731406 B CN112731406 B CN 112731406B CN 202011554168 A CN202011554168 A CN 202011554168A CN 112731406 B CN112731406 B CN 112731406B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J31/00—Apparatus for making beverages
- A47J31/44—Parts or details or accessories of beverage-making apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/539—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The embodiment of the invention provides a method, a device, a storage medium and a processor for identifying interference signals, and belongs to the field of electric appliances. The method for identifying the interference signal comprises the following steps: acquiring a reflected signal received by an ultrasonic detector; determining the highest peak with the largest amplitude in the peaks of the reflected signals in a preset time area; determining the area of an interval covering the highest peak according to the highest peak; determining that the area of the interval is larger than an area threshold; the reflected signal is identified as an interfering signal. The method of the invention can solve the problem of higher hardware cost.
Description
Technical Field
The present invention relates to the field of electrical appliances, and in particular, to a method, an apparatus, a storage medium, and a processor for identifying an interference signal.
Background
The principle of the ultrasonic water dispenser is that the transducer emits sound waves, the sound waves are reflected back when encountering obstacles, and the transducer converts corresponding time domain curves according to the energy of the reflected sound waves. Due to this feature of sound waves, it is often possible to measure the height of the cup and the height of the liquid surface.
Under normal conditions, an object placed in the water receiving table of the ultrasonic water dispenser is a cup for drinking water, the working closed loop of the ultrasonic water dispenser is to automatically discharge water after the cup height is detected, and the water is automatically stopped after the cup is full. However, if we put in not a cup but another object, such as our hand, we want the ultrasonic energy to recognize the nuances of the cup and other object (e.g., the hand) and stop the water discharge.
Since the information fed back by the ultrasonic wave is not imaging data of a lattice, but a time-domain curve of a distance and an amplitude, it is difficult to distinguish two different objects on the time-domain curve. The prior art is generally addressed by adding additional sensors to aid in distinguishing between the ultrasonic identification interference signal (e.g., human hand) and the cup, such as adding additional hardware such as infrared sensors, TOF optical sensors, and pressure sensors. Therefore, the existing method for identifying the interference signal has the problem of high hardware cost.
Disclosure of Invention
The embodiment of the invention aims to provide a method, a processor, a device, a water dispenser and a storage medium for identifying an interference signal, so as to solve the problem of high hardware cost of the existing method for identifying the interference signal.
To achieve the above object, a first aspect of the present invention provides a method for recognizing an interference signal, applied to a water dispenser including an ultrasonic probe, comprising:
acquiring a reflected signal received by an ultrasonic detector;
determining the highest peak with the largest amplitude in the peaks of the reflected signals in a preset time area;
determining the area of an interval covering the highest peak according to the highest peak;
determining that the area of the interval is larger than an area threshold; and
the reflected signal is identified as an interfering signal.
In an embodiment of the present invention, determining the section area includes: determining a first point and a second point which are closest to the highest peak in the reflected signal and have an amplitude equal to a critical value; determining the peak of the highest peak; and determining the area of the interval according to the distance between the first point and the second point and the distance between the vertex and the critical value.
In an embodiment of the present invention, determining an interval area according to a distance between a first point and a second point and a distance between a vertex and a critical value includes: a product of the distance between the first point and the second point and the distance between the vertex and the threshold is determined to determine the interval area.
In the embodiment of the present invention, determining the peak of the reflected signal with the largest amplitude in the peak in the preset time zone further includes: and determining that the amplitude of the peak of the reflected signal in the preset time area is greater than or equal to a peak threshold value.
In the embodiment of the invention, the method further comprises the following steps: determining a corresponding triangle area according to the first point, the second point and the vertex; determining a first angle and a second angle corresponding to two base angles of the triangular region; determining that an absolute value of a difference between the first angle and the second angle is greater than an angle threshold; the reflected signal is identified as an interfering signal.
In the embodiment of the invention, the method further comprises the following steps: determining a first slope of a straight line formed by the first point and the vertex and a second slope of a straight line formed by the second point and the vertex; determining that a difference between the absolute value of the first slope and the absolute value of the second slope is greater than a slope threshold; the reflected signal is identified as an interfering signal.
A second aspect of the invention provides a processor configured to perform the method for identifying an interfering signal of any of the above.
A third aspect of the present invention provides an apparatus for identifying an interfering signal, comprising:
an ultrasonic detector; and
a processor configured to:
acquiring a reflected signal received by an ultrasonic detector;
determining the highest peak with the largest amplitude in the peaks of the reflected signals in a preset time area;
determining the area of an interval covering the highest peak according to the highest peak;
Determining that the area of the interval is larger than an area threshold; and
the reflected signal is identified as an interfering signal.
In an embodiment of the invention, the processor is further configured to: determining a first point and a second point which are closest to the highest peak in the reflected signal and have an amplitude equal to a critical value; determining the peak of the highest peak; and determining the area of the interval according to the distance between the first point and the second point and the distance between the vertex and the critical value.
In an embodiment of the invention, the processor is further configured to: a product of the distance between the first point and the second point and the distance between the vertex and the threshold is determined to determine the interval area.
In an embodiment of the invention, the processor is further configured to: and determining that the amplitude of the peak of the reflected signal in the preset time area is greater than or equal to a peak threshold value.
In an embodiment of the invention, the processor is further configured to: determining a corresponding triangle area according to the first point, the second point and the vertex; determining a first angle and a second angle corresponding to two base angles of the triangular region; determining that an absolute value of a difference between the first angle and the second angle is greater than an angle threshold; the reflected signal is identified as an interfering signal.
In an embodiment of the invention, the processor is further configured to: determining a first slope of a straight line formed by the first point and the vertex and a second slope of a straight line formed by the second point and the vertex; determining that a difference between the absolute value of the first slope and the absolute value of the second slope is greater than a slope threshold; the reflected signal is identified as an interfering signal.
A fourth aspect of the present invention provides a water dispenser comprising a device for identifying an interfering signal according to any one of the above.
A fifth aspect of the invention provides a machine-readable storage medium having stored thereon instructions which, when executed by a processor, cause the processor to perform the method for identifying an interfering signal of any of the above.
According to the method for identifying the interference signals, the reflection signals received by the ultrasonic detector are obtained, the highest peak with the largest amplitude in the peak of the reflection signals in the preset time area is determined, the area of the section covering the highest peak is determined according to the highest peak, when the area of the section is determined to be larger than the area threshold, the reflection signals are identified as the interference signals, the interference signals (such as hands) and the non-interference signals (such as cups) can be distinguished without other hardware such as sensors, the original hardware of the water dispenser is not required to be changed while the hardware cost is reduced, the multi-dimensional characteristic signals are extracted based on the existing basic time domain signals through a software algorithm and a mathematical model, the model belonging to the interference signals is built, the accuracy of the identification result is improved, the false triggering probability of the water dispenser is reduced, and the safety in the use process of the water dispenser is improved.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain, without limitation, the embodiments of the invention. In the drawings:
FIG. 1 schematically illustrates a flow chart of a method for identifying an interfering signal in an embodiment of the invention;
fig. 2 schematically shows a flow chart of a method for identifying an interfering signal in another embodiment of the invention;
FIG. 3 schematically shows a flow chart of a method for identifying an interfering signal in another embodiment of the invention;
fig. 4 schematically shows a block diagram of an apparatus for identifying an interfering signal in an embodiment of the invention.
Detailed Description
The following describes the detailed implementation of the embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Fig. 1 schematically shows a flow chart of a method for identifying an interfering signal according to an embodiment of the invention. As shown in fig. 1, in an embodiment of the present invention, a method for identifying an interference signal is provided, and the method is described as applied to a water dispenser including an ultrasonic detector, and the method may include the following steps:
Step S102, obtaining a reflected signal received by an ultrasonic detector.
It is understood that the reflected signal is an acoustic signal reflected back by an obstacle encountered by the ultrasonic wave emitted by the ultrasonic probe. The working principle of the ultrasonic detector is that ultrasonic waves are emitted and received to meet sound waves reflected by an obstacle, so that the attribute type of the obstacle is judged.
Specifically, the water dispenser emits ultrasonic signals through the probe of the ultrasonic detector, when the water dispenser has an obstacle, the ultrasonic detector of the water dispenser receives reflected signals reflected by the obstacle, and a plurality of continuous reflected signals form a time domain curve, so that whether the obstacle is a cup or not is judged according to the time domain curve formed by the reflected signals.
Step S104, determining the highest peak with the largest amplitude in the peaks of the reflected signal in the preset time zone.
It can be understood that the preset time zone is a time zone of a reflected signal representing a water receiving zone of the water dispenser in a time domain curve formed by the reflected signals, further, the time domain curve can be divided into three major zones, including a transmitting zone of the reflected signal representing a zone close to a probe of the ultrasonic detector, a receiving zone of the reflected signal representing a water receiving zone of the water dispenser, and a water receiving zone of the reflected signal representing a water receiving zone of the water dispenser, wherein the water receiving zone on the time domain curve is mainly used for obtaining a reference height, and data after the water receiving zone is generally regarded as invalid data.
Specifically, the water dispenser generates a time domain curve of related time (i.e. distance from the probe) and amplitude according to the received reflected signal, and determines the highest peak with the largest amplitude in the peaks in the preset area (i.e. receiving area) by acquiring the amplitude of the peaks.
Step S106, determining the area of the section covering the highest peak according to the highest peak.
It is understood that the area of the interval is the area of the interval covering the peak, that is, the area of the peak in a certain reflection interval (for example, a strong reflection interval) on the time domain graph, for example, the area of a rectangular interval covering the peak on the time domain graph.
Specifically, the water dispenser determines the area of the section covering the highest peak by determining the area of the highest peak within a certain reflection section (e.g., a strong reflection section).
Step S108, determining that the interval area is larger than the area threshold.
It can be understood that the area threshold is an area threshold of a preset water dispenser for judging whether the water dispenser is an interference signal.
Specifically, the water dispenser may compare the interval area to an area threshold to determine that the interval area of the highest peak is greater than the area threshold.
In step S110, the reflected signal is identified as an interference signal.
It can be understood that the interference signal is a signal that the detected object is a non-water taking appliance in the detection area, i.e. a water signal that is ineffective for the ultrasonic water dispenser, such as a human hand signal.
Specifically, for example, in a scenario in which a user wipes the water dispenser with a hand or the user stretches a hand into a detection area of an ultrasonic detector of the water dispenser, the water dispenser recognizes the reflected signal as an interference signal (for example, a hand signal) when it is determined that an area of an interval of a highest peak of the time domain curve within a preset time region is greater than an area threshold.
According to the method for identifying the interference signals, the reflection signals received by the ultrasonic detector are obtained, the highest peak with the largest amplitude in the peak of the reflection signals in the preset time area is determined, the area of the section covering the highest peak is determined according to the highest peak, when the area of the section is determined to be larger than the area threshold, the reflection signals are identified as the interference signals, the interference signals (such as hands) and the non-interference signals (such as cups) can be distinguished without other hardware such as sensors, the original hardware of the water dispenser is not required to be changed while the hardware cost is reduced, the multi-dimensional characteristic signals are extracted based on the existing basic time domain signals through a software algorithm and a mathematical model, the model belonging to the interference signals is built, the accuracy of the identification result is improved, the false triggering probability of the water dispenser is reduced, and the safety in the use process of the water dispenser is improved.
In one embodiment, determining the zone area may include: determining a first point and a second point which are closest to the highest peak in the reflected signal and have an amplitude equal to a critical value; determining the peak of the highest peak; and determining the area of the interval according to the distance between the first point and the second point and the distance between the vertex and the critical value.
It is understood that the critical value is a preset lower limit value of the amplitude of a certain reflection interval (for example, a strong reflection interval). The first point is one point in the time domain curve, the amplitude of which is closest to the highest peak and is equal to the critical value, and the second point is the other point in the time domain curve, the amplitude of which is closest to the highest peak and is equal to the critical value.
Specifically, in the case that a plurality of continuous peaks exist in a preset time zone and one of the peaks is the highest peak, the water dispenser determines a first point and a second point which are closest to the highest peak and have amplitudes equal to a critical value, and further determines the peak of the highest peak (including the amplitude of the peak), so that the area of the section is determined according to the distance between the first point and the second point and the distance between the amplitude of the peak and the critical value.
In one embodiment, determining the interval area according to the distance between the first point and the second point and the distance between the vertex and the critical value may include: a product of the distance between the first point and the second point and the distance between the vertex and the threshold is determined to determine the interval area.
Specifically, the water dispenser takes a product value of two distances as a section area after determining a distance between the first point and the second point and a distance between the vertex and the critical value, that is, after determining two adjacent sides (or length and width) of the rectangle.
In one embodiment, determining the peak of the reflected signal having the greatest amplitude among the peaks within the predetermined time region further comprises: and determining that the amplitude of the peak of the reflected signal in the preset time area is greater than or equal to a peak threshold value.
It will be appreciated that the peak threshold is the lowest peak amplitude preset in the filtering process to indicate that the signal is valid, that is, a reflected signal having a peak amplitude less than the peak threshold may be determined in advance as a small unwanted interference signal, the signal may be filtered out in advance, and only peaks having a peak amplitude greater than or equal to the peak threshold are confirmed as valid data.
Specifically, before the water dispenser formally recognizes the interference signal, the peak of the reflected signal in the preset time area is compared with the preset peak threshold value, after the peak amplitude of the reflected signal in the preset time area is determined to be greater than or equal to the peak threshold value, the step of determining the highest peak with the largest amplitude in the peak of the reflected signal in the preset time area is carried out, otherwise, the reflected signal is determined to be an invalid signal, namely a tiny useless interference signal.
In this embodiment, the peak threshold is set in advance to filter out invalid reflected signals, so that most of tiny useless interference signals are basically removed, the efficiency of identifying interference signals can be improved, and the time for identifying a model can be shortened.
In one embodiment, the method further comprises: determining a corresponding triangle area according to the first point, the second point and the vertex; determining a first angle and a second angle corresponding to two base angles of the triangular region; determining that an absolute value of a difference between the first angle and the second angle is greater than an angle threshold; the reflected signal is identified as an interfering signal.
It will be appreciated that the first angle is the angular value of one of the base angles of the triangular region and the second angle is the angular value of the other base angle of the triangular region. The angle threshold is the minimum of the difference between the two base angles of the triangle area.
Specifically, after a time domain curve is generated, the water dispenser determines a corresponding triangular area according to a first point, a second point and the vertex of the highest peak, determines a first angle and a second angle corresponding to two base angles of the triangular area respectively, performs difference operation on the first angle and the second angle, compares an absolute value of the difference with an angle threshold value after obtaining the difference between the first angle and the second angle, determines that a reflected signal is an interference signal (e.g. a human hand) when the absolute value of the difference is determined to be greater than the angle threshold value, and otherwise considers the reflected signal as a non-interference signal (e.g. a cup).
In this embodiment, through setting up the angle threshold value, the difference size between first angle and the second angle is compared, discerns that the reflection signal is the interference signal when the difference is greater than the angle threshold value, can distinguish interference signal and non-interference signal, further improves the degree of accuracy that the interference signal discerned, guarantees the security of water dispenser use.
In one embodiment, the method further comprises: determining a first slope of a straight line formed by the first point and the vertex and a second slope of a straight line formed by the second point and the vertex; determining that a difference between the absolute value of the first slope and the absolute value of the second slope is greater than a slope threshold; the reflected signal is identified as an interfering signal.
It is understood that the first slope is the slope of a line formed by the connection of the first point and the vertex, and the second slope is the slope of a line formed by the connection of the second point and the vertex. The slope threshold is the lower limit value of the difference of the absolute values of the slopes.
Specifically, the water dispenser determines the first slope and the second slope by determining a first slope of a line formed by the first point and the vertex and a second slope of a line formed by the second point and the vertex, for example, determining a corresponding trigonometric function value (for example, a tangent value) by determining coordinates of the first point and coordinates of the vertex, coordinates of the second point and coordinates of the vertex to determine a slope value, performing a difference operation on an absolute value of the first slope and an absolute value of the second slope, comparing the difference value with a slope threshold after obtaining a difference value between the first slope and the second slope, and determining that the reflected signal is an interference signal (for example, a human hand) when determining that the difference value is greater than the slope threshold, otherwise, determining that the reflected signal is a non-interference signal (for example, a cup).
In this embodiment, by setting the slope threshold, comparing the absolute value of the first slope with the absolute value of the second slope, and identifying the reflected signal as an interference signal when the difference is greater than the slope threshold, the interference signal and the non-interference signal can be distinguished, the accuracy of identifying the interference signal is further improved, and the safety of the drinking machine in the use process is ensured.
Fig. 2 schematically shows a flow chart of a method for identifying an interfering signal in another embodiment of the invention. As shown in fig. 2, in an embodiment of the present invention, a method for identifying an interference signal is provided, and the method is described as applied to a water dispenser including an ultrasonic detector, and the method may include the following steps:
step S201, a reflected signal received by the ultrasonic probe is acquired.
Specifically, the water dispenser emits ultrasonic signals through the probe of the ultrasonic detector, when the water dispenser has an obstacle, the ultrasonic detector of the water dispenser receives reflected signals reflected by the obstacle, and a plurality of continuous reflected signals form a time domain curve, so that whether the obstacle is a cup or not is judged according to the time domain curve formed by the reflected signals.
Step S202, determining that the amplitude of the peak of the reflected signal in the preset time zone is greater than or equal to the peak threshold.
Specifically, before the drinking machine formally recognizes the interference signal, the peak of the reflected signal in the preset time area is compared with the preset peak threshold, after the peak amplitude of the reflected signal in the preset time area is determined to be greater than or equal to the peak threshold, step S203 is entered, otherwise, the reflected signal is determined to be an invalid signal, that is, a tiny useless interference signal.
Step S203, determining the highest peak with the largest amplitude in the peaks of the reflected signal in the preset time zone.
Specifically, the water dispenser generates a time domain curve of related time (i.e. distance from the probe) and amplitude according to the received reflected signal, and determines the highest peak with the largest amplitude in the peaks in the preset area (i.e. receiving area) by acquiring the amplitude of the peaks.
In step S204, a first point and a second point in the reflected signal closest to the highest peak and having an amplitude equal to a threshold value are determined.
Specifically, in the case that a plurality of continuous peaks exist in a preset time zone and one of the peaks is the highest peak, the water dispenser determines a first point and a second point, the amplitude of which is closest to the highest peak and is equal to a critical value. In one example, the critical value may be equal to the peak threshold.
In step S205, the vertex of the highest peak is determined.
Specifically, the water dispenser determines the position of the peak of the highest peak within the preset time zone.
Step S206, determining the area of the interval according to the distance between the first point and the second point and the distance between the vertex and the critical value.
Specifically, the water dispenser may use a product value of two distances as the section area after determining the distance between the first point and the second point and the distance between the vertex and the critical value, that is, after determining two adjacent sides (or length and width) of the rectangle.
Step S207, determining that the section area is greater than the area threshold.
Specifically, the water dispenser compares the interval area with an area threshold value, thereby determining that the interval area of the highest peak is greater than the area threshold value.
Step S208, corresponding triangle areas are determined according to the first point, the second point and the vertexes.
In step S209, a first angle and a second angle corresponding to the two base angles of the triangle area are determined.
In step S210, it is determined that the absolute value of the difference between the first angle and the second angle is greater than the angle threshold.
In step S211, the reflected signal is identified as an interference signal.
Specifically, after a time domain curve is generated, the water dispenser determines a corresponding triangular area according to a first point, a second point and the vertex of the highest peak, determines a first angle and a second angle corresponding to two base angles of the triangular area respectively, performs difference operation on the first angle and the second angle, compares an absolute value of the difference with an angle threshold value after obtaining the difference between the first angle and the second angle, and determines that a reflected signal is an interference signal when determining that the absolute value of the difference is larger than the angle threshold value.
In this embodiment, after a peak threshold is set to filter out a part of invalid interference signals, comparing an area of a section covering the highest peak with an area threshold, determining that the area of the section is greater than the area threshold, comparing an absolute value of a difference between two base angles of a triangular area formed by a first point, a second point and a vertex with an angle threshold, and after determining that the absolute value is greater than the angle threshold, identifying the reflected signal as the interference signal so as to control the water dispenser to stop water discharge. According to the method, the hardware cost is reduced, the original hardware of the water dispenser is not changed, the multi-dimensional characteristic signals are extracted based on the existing basic time domain signals through a software algorithm and a mathematical model, and a model belonging to interference signals is built, so that the accuracy of the identification result is further improved, the false triggering probability of the water dispenser is reduced, and the safety of the water dispenser in the use process is improved.
Fig. 3 schematically shows a flow chart of a method for identifying an interfering signal in another embodiment of the invention. As shown in fig. 3, in an embodiment of the present invention, a method for identifying an interference signal is provided, and the method is described as applied to a water dispenser including an ultrasonic detector, and the method may include the following steps:
In step S301, a reflected signal received by the ultrasonic probe is acquired.
Specifically, the water dispenser emits ultrasonic signals through the probe of the ultrasonic detector, when the water dispenser has an obstacle, the ultrasonic detector of the water dispenser receives reflected signals reflected by the obstacle, and a plurality of continuous reflected signals form a time domain curve, so that whether the obstacle is a cup or not is judged according to the time domain curve formed by the reflected signals.
In step S302, it is determined that the amplitude of the peak of the reflected signal in the preset time region is greater than or equal to the peak threshold.
Specifically, before the drinking machine formally recognizes the interference signal, the peak of the reflected signal in the preset time area is compared with the preset peak threshold, after the peak amplitude of the reflected signal in the preset time area is determined to be greater than or equal to the peak threshold, step S303 is performed, otherwise, the reflected signal is determined to be an invalid signal, that is, a tiny useless interference signal.
In step S303, the highest peak with the largest amplitude in the peaks of the reflected signal in the preset time region is determined.
Specifically, the water dispenser generates a time domain curve of related time (i.e. distance from the probe) and amplitude according to the received reflected signal, and determines the highest peak with the largest amplitude in the peaks in the preset area (i.e. receiving area) by acquiring the amplitude of the peaks.
Step S304, determining a first point and a second point in the reflected signal closest to the highest peak and having an amplitude equal to a threshold value.
Specifically, in the case that a plurality of continuous peaks exist in a preset time zone and one of the peaks is the highest peak, the water dispenser determines a first point and a second point, the amplitude of which is closest to the highest peak and is equal to a critical value.
In one example, the critical value may be equal to the peak threshold.
In step S305, the vertex of the highest peak is determined.
Specifically, the water dispenser determines the position of the peak of the highest peak within the preset time zone.
Step S306, determining the area of the interval according to the distance between the first point and the second point and the distance between the vertex and the critical value.
Specifically, the water dispenser may use a product value of two distances as the section area after determining the distance between the first point and the second point and the distance between the vertex and the critical value, that is, after determining two adjacent sides (or length and width) of the rectangle.
Step S307 determines that the section area is greater than the area threshold.
Specifically, the water dispenser compares the interval area with an area threshold value, thereby determining that the interval area of the highest peak is greater than the area threshold value.
In step S308, a first slope of a line formed by the first point and the vertex and a second slope of a line formed by the second point and the vertex are determined.
Step S309 determines that the difference between the absolute value of the first slope and the absolute value of the second slope is greater than the slope threshold.
In step S310, the reflected signal is identified as an interference signal.
Specifically, the water dispenser determines the first slope and the second slope by determining a first slope of a line formed by the first point and the vertex and a second slope of a line formed by the second point and the vertex, for example, determining a corresponding trigonometric function value (for example, a tangent value) by determining coordinates of the first point and coordinates of the vertex, coordinates of the second point and coordinates of the vertex to determine a slope value, performing a difference operation on an absolute value of the first slope and an absolute value of the second slope, comparing the difference value with a slope threshold after obtaining a difference value therebetween, and determining that the reflected signal is an interference signal when determining that the difference value is greater than the slope threshold.
In this embodiment, after a peak threshold is set to filter out a part of invalid interference signals, comparing an area of a section covering the highest peak with an area threshold, determining that the area of the section is greater than the area threshold, comparing a difference between an absolute value of a first slope of a straight line formed by a first point and a vertex and an absolute value of a second slope of a straight line formed by a second point and the vertex with the slope threshold, and after determining that the area of the section is greater than the slope threshold, identifying the reflected signal as the interference signal to control the water dispenser to stop water discharge. According to the method, the hardware cost is reduced, the original hardware of the water dispenser is not changed, the multi-dimensional characteristic signals are extracted based on the existing basic time domain signals through a software algorithm and a mathematical model, and a model belonging to interference signals is built, so that the accuracy of the identification result is further improved, the false triggering probability of the water dispenser is reduced, and the safety of the water dispenser in the use process is improved.
Fig. 4 schematically shows a block diagram of an apparatus for identifying an interfering signal in an embodiment of the invention. As shown in fig. 4, in an embodiment of the present invention, there is provided an apparatus 400 for identifying an interference signal, including: an ultrasonic probe 410 and a processor 420, wherein:
a processor 420 configured to: acquiring a reflected signal received by an ultrasonic detector; determining the highest peak with the largest amplitude in the peaks of the reflected signals in a preset time area; determining the area of an interval covering the highest peak according to the highest peak; determining that the area of the interval is larger than an area threshold; and identifying the reflected signal as an interfering signal.
It is understood that the reflected signal is an acoustic signal reflected back by an obstacle encountered by the ultrasonic wave emitted by the ultrasonic probe. The working principle of the ultrasonic detector is that ultrasonic waves are emitted and received to meet sound waves reflected by an obstacle, so that the attribute type of the obstacle is judged. The preset time zone is a time zone of a reflection signal representing a water receiving zone of the water dispenser in a time zone curve formed by the reflection signals, further, the time zone curve can be divided into three major zones, wherein the time zone curve comprises a transmitting zone of the reflection signal representing a zone close to a probe of the ultrasonic detector, a receiving zone of the reflection signal representing a water receiving zone of the water dispenser and a water receiving zone of the reflection signal representing a water receiving zone of the water dispenser, the water receiving zone on the time zone curve is mainly used for acquiring a reference height, and data after the water receiving zone is generally regarded as invalid data. The area of the segment is the area of the segment covering the peak, that is, the area of the peak in a certain reflection segment (for example, a strong reflection segment) on the time domain curve, for example, the area of a rectangular segment covering the peak on the time domain graph. The area threshold is an area threshold which is preset for the water dispenser to judge whether the water dispenser is an interference signal. The interference signal is a signal that the detected object appears in the detection area as a non-water taking appliance, namely a water signal which is invalid for the ultrasonic water dispenser, such as a human hand signal.
Specifically, the water dispenser emits ultrasonic signals through the probe of the ultrasonic detector, when the water dispenser has an obstacle, the ultrasonic detector of the water dispenser receives reflected signals reflected by the obstacle, and a plurality of continuous reflected signals form a time domain curve, so that whether the obstacle is a cup or not is judged according to the time domain curve formed by the reflected signals. The water dispenser generates a time domain curve of related time (namely distance from the probe) and amplitude according to the received reflected signal, and determines the highest peak with the largest amplitude in the peaks in the preset area (namely the receiving area) by acquiring the amplitude of the peaks. The water dispenser determines the area of the section covering the highest peak by determining the area of the highest peak within a certain reflection section (e.g., a strong reflection section). The water dispenser may compare the interval area to an area threshold to determine that the interval area of the highest peak is greater than the area threshold. For example, in a scenario such as a user wiping the water dispenser with his hand or a user stretching his hand into a detection area of an ultrasonic probe of the water dispenser, the water dispenser recognizes the reflected signal as an interference signal (e.g., a hand signal) if it is determined that the area of the interval of the highest peak of the time domain curve within the preset time region is greater than the area threshold.
According to the device for identifying the interference signals, the reflection signals received by the ultrasonic detector are obtained, the highest peak with the largest amplitude in the peak of the reflection signals in the preset time area is determined, the area of the section covering the highest peak is determined according to the highest peak, when the area of the determined section is larger than the area threshold, the reflection signals are identified as the interference signals, the interference signals (such as hands) and the non-interference signals (such as cups) can be distinguished without other hardware such as sensors, the original hardware of the water dispenser is not changed while the hardware cost is reduced, the multi-dimensional characteristic signals are extracted based on the existing basic time domain signals through a software algorithm and a mathematical model, the model belonging to the interference signals is built, the accuracy of the identification result is improved, the false triggering probability of the water dispenser is reduced, and the safety in the use process of the water dispenser is improved.
In one embodiment, the processor 420 is further configured to: determining a first point and a second point which are closest to the highest peak in the reflected signal and have an amplitude equal to a critical value; determining the peak of the highest peak; and determining the area of the interval according to the distance between the first point and the second point and the distance between the vertex and the critical value.
It is understood that the critical value is a preset lower limit value of the amplitude of a certain reflection interval (for example, a strong reflection interval). The first point is one point in the time domain curve, the amplitude of which is closest to the highest peak and is equal to the critical value, and the second point is the other point in the time domain curve, the amplitude of which is closest to the highest peak and is equal to the critical value.
Specifically, in the case that a plurality of continuous peaks exist in a preset time zone and one of the peaks is the highest peak, the water dispenser determines a first point and a second point which are closest to the highest peak and have amplitudes equal to a critical value, and further determines the peak of the highest peak (including the amplitude of the peak), so that the area of the section is determined according to the distance between the first point and the second point and the distance between the amplitude of the peak and the critical value.
In one embodiment, the processor 420 is further configured to: a product of the distance between the first point and the second point and the distance between the vertex and the threshold is determined to determine the interval area.
Specifically, the water dispenser takes a product value of two distances as a section area after determining a distance between the first point and the second point and a distance between the vertex and the critical value, that is, after determining two adjacent sides (or length and width) of the rectangle.
In one embodiment, the processor 420 is further configured to: and determining that the amplitude of the peak of the reflected signal in the preset time area is greater than or equal to a peak threshold value.
It will be appreciated that the peak threshold is the lowest peak amplitude preset in the filtering process to indicate that the signal is valid, that is, a reflected signal having a peak amplitude less than the peak threshold may be determined in advance as a small unwanted interference signal, the signal may be filtered out in advance, and only peaks having a peak amplitude greater than or equal to the peak threshold are confirmed as valid data.
Specifically, before the water dispenser formally recognizes the interference signal, the peak of the reflected signal in the preset time area is compared with the preset peak threshold value, after the peak amplitude of the reflected signal in the preset time area is determined to be greater than or equal to the peak threshold value, the step of determining the highest peak with the largest amplitude in the peak of the reflected signal in the preset time area is carried out, otherwise, the reflected signal is determined to be an invalid signal, namely a tiny useless interference signal.
The device in the embodiment can filter out invalid reflected signals by setting the peak threshold in advance, so that most of tiny useless interference signals are basically removed, the efficiency of identifying the interference signals can be improved, and the time for identifying the model is shortened.
In one embodiment, the processor 420 is further configured to: determining a corresponding triangle area according to the first point, the second point and the vertex; determining a first angle and a second angle corresponding to two base angles of the triangular region; determining that an absolute value of a difference between the first angle and the second angle is greater than an angle threshold; the reflected signal is identified as an interfering signal.
It will be appreciated that the first angle is the angular value of one of the base angles of the triangular region and the second angle is the angular value of the other base angle of the triangular region. The angle threshold is the minimum of the difference between the two base angles of the triangle area.
Specifically, after a time domain curve is generated, the water dispenser determines a corresponding triangular area according to a first point, a second point and the vertex of the highest peak, determines a first angle and a second angle corresponding to two base angles of the triangular area respectively, performs difference operation on the first angle and the second angle, compares an absolute value of the difference with an angle threshold value after obtaining the difference between the first angle and the second angle, determines that a reflected signal is an interference signal (e.g. a human hand) when the absolute value of the difference is determined to be greater than the angle threshold value, and otherwise considers the reflected signal as a non-interference signal (e.g. a cup).
According to the device, the angle threshold value is set, the difference value between the first angle and the second angle is compared, the reflected signal is identified as the interference signal when the difference value is larger than the angle threshold value, the interference signal and the non-interference signal can be distinguished, the accuracy of the interference signal identification is further improved, and the safety of the water dispenser in the use process is guaranteed.
In one embodiment, the processor 420 is further configured to: determining a first slope of a straight line formed by the first point and the vertex and a second slope of a straight line formed by the second point and the vertex; determining that a difference between the absolute value of the first slope and the absolute value of the second slope is greater than a slope threshold; the reflected signal is identified as an interfering signal.
It is understood that the first slope is the slope of a line formed by the connection of the first point and the vertex, and the second slope is the slope of a line formed by the connection of the second point and the vertex. The slope threshold is the lower limit value of the difference of the absolute values of the slopes.
Specifically, the water dispenser determines the first slope and the second slope by determining a first slope of a line formed by the first point and the vertex and a second slope of a line formed by the second point and the vertex, for example, determining a corresponding trigonometric function value (for example, a tangent value) by determining coordinates of the first point and coordinates of the vertex, coordinates of the second point and coordinates of the vertex to determine a slope value, performing a difference operation on an absolute value of the first slope and an absolute value of the second slope, comparing the difference value with a slope threshold after obtaining a difference value between the first slope and the second slope, and determining that the reflected signal is an interference signal (for example, a human hand) when determining that the difference value is greater than the slope threshold, otherwise, determining that the reflected signal is a non-interference signal (for example, a cup).
According to the device, the slope threshold value is set, the difference value between the absolute value of the first slope and the absolute value of the second slope is compared, the reflected signal is identified as the interference signal when the difference value is larger than the slope threshold value, the interference signal and the non-interference signal can be distinguished, the accuracy of identifying the interference signal is further improved, and the safety of the water dispenser in the use process is guaranteed.
The device for identifying the interference signal comprises a processor and a memory, wherein the processor comprises a kernel, and the kernel calls corresponding program units in the memory. The kernel may be provided with one or more kernel parameters for identifying the interfering signal by adjusting the kernel parameters.
The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.
The present embodiment provides a processor configured to perform the method for identifying an interfering signal according to the above-described embodiments.
The embodiment of the invention provides a water dispenser, which comprises the device for identifying the interference signal according to the embodiment.
Embodiments of the present invention provide a machine-readable storage medium having instructions stored thereon, which when executed by a processor, cause the processor to perform a method for identifying an interfering signal according to the above-described embodiments.
The present application also provides a computer program product adapted to perform a program initialized with the method for identifying an interfering signal in the above-described embodiments when executed on a data processing device.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (7)
1. A method for identifying interference signals, applied to a water dispenser including an ultrasonic detector, the method comprising:
obtaining a reflected signal received by the ultrasonic detector;
determining the highest peak with the largest amplitude in the peaks of the reflected signals in a preset time area;
determining the area of an interval covering the highest peak according to the highest peak;
determining that the interval area is larger than an area threshold; and
identifying the reflected signal as an interfering signal;
wherein the determining, according to the highest peak, an area of a section covering the highest peak includes:
determining a first point and a second point which are closest to the highest peak in the reflected signal and have amplitude values equal to a critical value;
determining the peak of the highest peak;
determining a product value of a distance between the first point and the second point and a distance between the vertex and the critical value to determine the interval area;
Before the identifying the reflected signal as the interference signal, the method further includes:
determining a corresponding triangle area according to the first point, the second point and the vertex; determining a first angle and a second angle corresponding to two base angles of the triangular region; determining that an absolute value of a difference between the first angle and the second angle is greater than an angle threshold; or alternatively
Determining a first slope of a line formed by the first point and the vertex and a second slope of a line formed by the second point and the vertex; determining that a difference between an absolute value of the first slope and an absolute value of the second slope is greater than a slope threshold.
2. The method of claim 1, wherein determining the highest peak of the reflected signal having the greatest magnitude among the peaks within the predetermined time region further comprises:
and determining that the amplitude of the peak of the reflected signal in the preset time area is larger than or equal to a peak threshold value.
3. A processor, characterized in that the processor is configured to perform the method for identifying an interfering signal according to claim 1 or 2.
4. An apparatus for identifying an interfering signal, comprising:
An ultrasonic detector; and
a processor configured to:
obtaining a reflected signal received by the ultrasonic detector;
determining the highest peak with the largest amplitude in the peaks of the reflected signals in a preset time area;
determining the area of an interval covering the highest peak according to the highest peak;
determining that the interval area is larger than an area threshold; and
identifying the reflected signal as an interfering signal;
wherein the processor is configured to determine an interval area covering the highest peak from the highest peak, comprising the processor being further configured to:
determining a first point and a second point which are closest to the highest peak in the reflected signal and have amplitude values equal to a critical value;
determining the peak of the highest peak;
determining a product value of a distance between the first point and the second point and a distance between the vertex and the critical value to determine the interval area;
wherein, prior to said identifying the reflected signal as an interfering signal, the processor is further configured to:
determining a corresponding triangle area according to the first point, the second point and the vertex; determining a first angle and a second angle corresponding to two base angles of the triangular region; determining that an absolute value of a difference between the first angle and the second angle is greater than an angle threshold; or alternatively
Determining a first slope of a line formed by the first point and the vertex and a second slope of a line formed by the second point and the vertex; determining that a difference between an absolute value of the first slope and an absolute value of the second slope is greater than a slope threshold.
5. The apparatus of claim 4, wherein the processor is further configured to:
and determining that the amplitude of the peak of the reflected signal in the preset time area is larger than or equal to a peak threshold value.
6. A water dispenser comprising a device for identifying an interference signal according to claim 4 or 5.
7. A machine-readable storage medium having instructions stored thereon, which when executed by a processor cause the processor to perform the method for identifying an interfering signal according to claim 1 or 2.
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| CN202011554168.9A CN112731406B (en) | 2020-12-24 | 2020-12-24 | Method, device, storage medium and processor for identifying interference signals |
| PCT/CN2021/120208 WO2022134694A1 (en) | 2020-12-24 | 2021-09-24 | Method and apparatus for identifying interference signal, and storage medium and processor |
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| CN202011554168.9A CN112731406B (en) | 2020-12-24 | 2020-12-24 | Method, device, storage medium and processor for identifying interference signals |
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| CN109288393A (en) * | 2018-10-31 | 2019-02-01 | 上海沐鹭科技有限公司 | A kind of intelligent drinking machine |
| CN109770715A (en) * | 2018-11-29 | 2019-05-21 | 珠海格力电器股份有限公司 | Intelligent water dispenser and control method thereof |
| CN109745050A (en) * | 2018-12-24 | 2019-05-14 | 曾乐朋 | The characteristic information detection method and device of motor message |
| CN112731406B (en) * | 2020-12-24 | 2023-05-12 | 佛山市顺德区美的饮水机制造有限公司 | Method, device, storage medium and processor for identifying interference signals |
| CN113030979B (en) * | 2021-05-26 | 2021-08-17 | 北京星天科技有限公司 | Method and device for detecting position depth of target object |
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