CN112731406A - Method, apparatus, storage medium, and processor for identifying interference signal - Google Patents
Method, apparatus, storage medium, and processor for identifying interference signal Download PDFInfo
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- CN112731406A CN112731406A CN202011554168.9A CN202011554168A CN112731406A CN 112731406 A CN112731406 A CN 112731406A CN 202011554168 A CN202011554168 A CN 202011554168A CN 112731406 A CN112731406 A CN 112731406A
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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 and a device for identifying interference signals, a storage medium and a processor, 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 value in peaks of the reflected signal in a preset time region; determining the interval area 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 interference signal. The method of the invention can solve the problem of high hardware cost.
Description
Technical Field
The invention relates to the field of electric appliances, in particular to a method, a device, a storage medium and a processor for identifying interference signals.
Background
The principle of the ultrasonic water dispenser is that sound waves are emitted by an energy converter, the sound waves are reflected when encountering barriers, and the energy converter converts the energy of the reflected sound waves into a corresponding time domain curve. Due to this characteristic of sound waves, it is generally possible to measure the height of the cup and the height of the liquid level.
Under normal conditions, an object put into the water receiving platform of the ultrasonic water dispenser is a cup for drinking water, the working closed loop of the ultrasonic water dispenser automatically discharges water after the cup height is detected, and the water is automatically stopped after the cup is full. However, if we are not a cup but other objects, such as our hands, we want the ultrasonic wave to identify the slight difference between the cup and other objects (e.g., hands) and stop the water.
Since the information fed back by the ultrasonic wave is not the imaging data of the lattice, but the time domain curve of the distance and the amplitude, it is difficult to distinguish two different objects on the time domain curve. The prior art has generally been addressed by adding additional sensors to assist in distinguishing ultrasonic identification interfering signals (e.g., human hands) from cups, such as additional hardware such as infrared sensors, TOF optical sensing, 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 interference signals, so as to solve the problem of higher hardware cost of the existing method for identifying the interference signals.
In order to achieve the above object, a first aspect of the present invention provides a method for identifying an interference signal, applied to a water dispenser including an ultrasonic detector, including:
acquiring a reflected signal received by an ultrasonic detector;
determining the highest peak with the largest amplitude value in peaks of the reflected signal in a preset time region;
determining the interval area 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 interference signal.
In the embodiment of the present invention, determining the area of the interval includes: determining a first point and a second point which are closest to the highest peak in the reflected signal and have 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 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 includes: the product of the distance between the first point and the second point and the distance between the vertex and the critical value is determined to determine the area of the interval.
In an embodiment of the present invention, determining that the peak of the reflected signal with the largest amplitude in the peaks in the preset time region is before the highest peak further includes: and determining that the amplitude of the peak of the reflected signal in the preset time region is greater than or equal to a peak threshold value.
In an embodiment of the present invention, the method further comprises: determining a corresponding triangular 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 area; 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 interference signal.
In an embodiment of the present invention, 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 an absolute value of the first slope and an absolute value of the second slope is greater than a slope threshold; the reflected signal is identified as an interference signal.
A second aspect of the invention provides a processor configured to perform the method for identifying an interfering signal of any one 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 value in peaks of the reflected signal in a preset time region;
determining the interval area 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 interference 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 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: the product of the distance between the first point and the second point and the distance between the vertex and the critical value is determined to determine the area of the interval.
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 region 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 triangular 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 area; 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 interference 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 an absolute value of the first slope and an absolute value of the second slope is greater than a slope threshold; the reflected signal is identified as an interference signal.
The invention provides a water dispenser, which comprises any one of the devices for identifying the interference signal.
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 one of the above.
The method for identifying the interference signal determines the highest peak with the maximum amplitude in the peaks of the reflection signal in the preset time region by acquiring the reflection signal received by the ultrasonic detector, determines the interval area covering the highest peak according to the highest peak, when the area of the interval is determined to be larger than the area threshold, the reflected signal is identified as an interference signal without the help of other hardware such as sensors, can distinguish interference signals (such as human hands) from non-interference signals (such as cups), reduces the hardware cost, does not need to change the original hardware of the water dispenser, through a software algorithm and a mathematical model, based on the existing basic time domain signal, a multidimensional characteristic signal is extracted, and a model belonging to an interference signal is established, so that the accuracy of a recognition result is improved, the false triggering probability of the water dispenser is reduced, and the safety of the water dispenser in the use process 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, which are included to provide a further understanding of the 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 the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 schematically shows a flow diagram of a method for identifying an interfering signal in an embodiment of the invention;
FIG. 2 schematically illustrates a flow chart of a method for identifying an interfering signal in another embodiment of the invention;
FIG. 3 schematically illustrates a flow chart of a method for identifying an interfering signal in another embodiment of the invention;
fig. 4 is a block diagram schematically illustrating an apparatus for identifying an interference signal according to an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 schematically shows a flow chart of a method for identifying an interfering signal in an embodiment of the present invention. As shown in fig. 1, in an embodiment of the present invention, a method for identifying an interference signal is provided, which is described by taking the method as an example of being applied to a water dispenser including an ultrasonic detector, and the method may include the following steps:
step S102, acquiring a reflection signal received by the ultrasonic detector.
It is understood that the reflected signal is a sound wave signal reflected by the ultrasonic wave emitted by the ultrasonic detector when the ultrasonic wave encounters an obstacle. The working principle of the ultrasonic detector is to judge the attribute type of an obstacle by transmitting ultrasonic waves and receiving the sound waves reflected by the obstacle when the ultrasonic waves encounter the obstacle.
Specifically, the water dispenser transmits an ultrasonic signal through a probe of the ultrasonic detector, when the water dispenser has an obstacle, the ultrasonic detector of the water dispenser receives a reflected signal 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.
And step S104, determining the highest peak with the maximum amplitude in the peaks of the reflected signal in the preset time region.
It can be understood that the preset time region is a time region representing a reflected signal of a water receiving region of the water dispenser in a time domain curve formed by the reflected signals, further, the time domain curve can be divided into three regions, including a transmitting region representing the reflected signal of a region close to the probe of the ultrasonic detector, a receiving region representing the reflected signal of the water receiving region of the water dispenser, and a water receiving platform region representing the reflected signal of the water receiving platform region of the water dispenser, the water receiving platform region on the time domain curve is mainly used for obtaining a reference height, and data after the water receiving platform region is generally regarded as invalid data.
Specifically, the water dispenser generates a time domain curve of relevant time (namely, distance from the probe) and amplitude according to the received reflection signal, and determines the highest peak with the maximum amplitude in the peaks of the reflection signal in a preset region (namely, a receiving region) by acquiring the amplitude of the peak.
And S106, determining the interval area covering the highest peak according to the highest peak.
It is understood that the interval area is an interval area covering a peak, i.e. the area of a peak in a certain reflection interval (e.g. a strong reflection interval) on the time domain curve is symbolized, for example, the area of a rectangular interval covering a peak on the time domain curve.
Specifically, the water dispenser determines the interval area covering the highest peak by determining the area of the highest peak within a certain reflection interval (e.g., a strong reflection interval).
And step S108, determining that the area of the section is larger than the area threshold value.
It can be understood that the area threshold is a preset area critical value for judging whether the water dispenser is an interference signal.
Specifically, the water dispenser can compare the interval area with an area threshold value, so as to determine that the interval area of the highest peak is larger than the area threshold value.
Step S110, identifying the reflected signal as an interference signal.
It can be understood that the interference signal is a signal that a detected object appears in the detection area as a non-water-taking appliance, namely a water use signal which is invalid for the ultrasonic water dispenser, such as a hand signal.
Specifically, for example, in a scene that a user wipes the water dispenser with a hand or the user inserts the hand into a detection area of an ultrasonic detector of the water dispenser, when the water dispenser determines that an interval area of a highest peak of a time domain curve in a preset time region is larger than an area threshold, the reflected signal is identified as an interference signal (for example, a hand signal).
The method for identifying the interference signal determines the highest peak with the maximum amplitude in the peaks of the reflection signal in the preset time region by acquiring the reflection signal received by the ultrasonic detector, determines the interval area covering the highest peak according to the highest peak, when the area of the interval is determined to be larger than the area threshold, the reflected signal is identified as an interference signal without the help of other hardware such as sensors, can distinguish interference signals (such as human hands) from non-interference signals (such as cups), reduces the hardware cost, does not need to change the original hardware of the water dispenser, through a software algorithm and a mathematical model, based on the existing basic time domain signal, a multidimensional characteristic signal is extracted, and a model belonging to an interference signal is established, so that the accuracy of a recognition result is improved, the false triggering probability of the water dispenser is reduced, and the safety of the water dispenser in the use process is improved.
In one embodiment, determining the zone area may comprise: determining a first point and a second point which are closest to the highest peak in the reflected signal and have 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 lower limit value of the amplitude of a certain reflection interval (e.g., a strong reflection interval) set in advance. The first point is one of the points in the time domain curve whose amplitude nearest to the highest peak is equal to the critical value, and the second point is the other point in the time domain curve whose amplitude nearest to the highest peak is equal to the critical value.
Specifically, under the condition that a plurality of continuous wave crests exist in a preset time region and one wave crest is the highest wave crest, the water dispenser determines a first point and a second point, wherein the amplitude value closest to the highest wave crest is equal to a critical value, and further determines the peak of the highest wave crest (including the amplitude value of the peak), so that the area of an interval is determined according to the distance between the first point and the second point and the distance between the amplitude value of the peak and the critical value.
In one embodiment, 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 may include: the product of the distance between the first point and the second point and the distance between the vertex and the critical value is determined to determine the area of the interval.
Specifically, after the distance between the first point and the second point and the distance between the vertex and the critical value are determined, that is, after two adjacent side lengths (or the length and the width) of the rectangle are determined, the product value of the two distances is used as the section area.
In one embodiment, the determining that the reflected signal is before the highest peak with the largest amplitude among peaks in the preset time zone further includes: and determining that the amplitude of the peak of the reflected signal in the preset time region is greater than or equal to a peak threshold value.
It is understood that the peak threshold is the lowest peak amplitude preset in the filtering process to indicate that the signal is valid, that is, the reflected signal whose peak amplitude is smaller than the peak threshold may be determined in advance as a small unwanted interference signal, the signal may be filtered in advance, and only the peak whose peak amplitude is greater than or equal to the peak threshold is determined as valid data.
Specifically, before the water dispenser formally identifies the interference signal, the peak of the reflected signal in the preset time region is compared with a preset peak threshold, after the amplitude of the peak of the reflected signal in the preset time region is determined to be greater than or equal to the peak threshold, the step of determining the highest peak of the reflected signal with the largest amplitude in the peaks in the preset time region is performed, and otherwise, the reflected signal is determined to be an invalid signal, namely a tiny useless interference signal.
In the embodiment, the invalid reflected signals can be filtered by setting the peak threshold value in advance, most of tiny useless interference signals are basically removed, the efficiency of identifying the interference signals can be improved, and the time of identifying the model is shortened.
In one embodiment, the method further comprises: determining a corresponding triangular 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 area; 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 interference signal.
It will be appreciated that the first angle is the value of one of the base angles of the triangular region and the second angle is the value of the other base angle of the triangular region. The angle threshold is the minimum of the difference of the two base angles of the triangular region.
Specifically, after the water dispenser generates a time domain curve, a corresponding triangular area is determined according to a first point, a second point and a vertex of a highest peak, a first angle and a second angle respectively corresponding to two base angles of the triangular area are determined, the first angle and the second angle are subjected to difference operation, after a difference value between the first angle and the second angle is obtained, an absolute value of the difference value is compared with an angle threshold, when the absolute value of the difference value is greater than the angle threshold, a reflected signal is determined to be an interference signal (for example, a human hand), and otherwise, the reflected signal is regarded as a non-interference signal (for example, a cup).
In the embodiment, the angle threshold is set, the difference value between the first angle and the second angle is compared, when the difference value is greater than the angle threshold, the reflected signal is identified as the interference signal, the interference signal and the non-interference signal can be distinguished, the identification accuracy of the interference signal is further improved, and the safety of the water dispenser in the using process is ensured.
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 an absolute value of the first slope and an absolute value of the second slope is greater than a slope threshold; the reflected signal is identified as an interference signal.
It is understood that the first slope is a slope of a line formed by connecting the first point and the vertex, and the second slope is a slope of a line formed by connecting the second point and the vertex. The slope threshold is a lower limit value of the difference in absolute values of the slopes.
Specifically, the water dispenser determines a first slope of a straight line formed by a first point and a vertex and a second slope of a straight line formed by a second point and the vertex, for example, a corresponding trigonometric function value (e.g., a tangent value) can be determined by a coordinate of the first point and a coordinate of the vertex and a coordinate of the second point and a coordinate of the vertex to determine a slope value, thereby determining the first slope and the second slope, 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 the difference value between the first slope and the second slope, determining the reflected signal as an interference signal (e.g., a human hand) when the difference value is greater than the slope threshold, and considering the reflected signal as a non-interference signal (e.g., a cup) otherwise.
In the embodiment, the slope threshold is set, the difference value between the absolute value of the first slope and the absolute value of the second slope is compared, when the difference value is greater than the slope threshold, the reflected signal is identified as the interference signal, the interference signal and the non-interference signal can be distinguished, the identification accuracy of the interference signal is further improved, and the safety of the water dispenser in the using process is ensured.
Fig. 2 schematically shows a flow chart of a method for identifying an interfering signal in another embodiment of the present invention. As shown in fig. 2, in the embodiment of the present invention, a method for identifying an interference signal is provided, which is described by taking the method as an example of being applied to a water dispenser including an ultrasonic detector, and the method may include the following steps:
in step S201, a reflected signal received by the ultrasonic probe is acquired.
Specifically, the water dispenser transmits an ultrasonic signal through a probe of the ultrasonic detector, when the water dispenser has an obstacle, the ultrasonic detector of the water dispenser receives a reflected signal 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 region is greater than or equal to a peak threshold value.
Specifically, before the interference signal is formally identified by the water dispenser, the peak of the reflected signal in the preset time region is compared with a preset peak threshold, and after the amplitude of the peak of the reflected signal in the preset time region is determined to be greater than or equal to the peak threshold, the step S203 is performed, otherwise, the reflected signal is determined to be an invalid signal, namely a tiny useless interference signal.
Step S203, determining the highest peak with the largest amplitude among peaks of the reflected signal in the preset time region.
Specifically, the water dispenser generates a time domain curve of relevant time (namely, distance from the probe) and amplitude according to the received reflection signal, and determines the highest peak with the maximum amplitude in the peaks of the reflection signal in a preset region (namely, a receiving region) by acquiring the amplitude of the peak.
In step S204, a first point and a second point, which are closest to the highest peak and have amplitudes equal to a threshold value, in the reflected signal are determined.
Specifically, under the condition that a plurality of continuous wave crests exist in a preset time region and one wave crest is the highest wave crest, the water dispenser determines a first point and a second point, wherein the amplitude value closest to the highest wave crest is equal to a critical value. In one example, the threshold value may be equal to the peak threshold value.
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 in a preset time region.
In step S206, the area of the section is determined according to the distance between the first point and the second point and the distance between the vertex and the critical value.
Specifically, 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 side lengths (or the length and the width) of the rectangle, the water dispenser may use the product value of the two distances as the interval area.
Step S207, it is determined that the section area is greater than the area threshold.
Specifically, the water dispenser compares the interval area with an area threshold value, so as to determine that the interval area of the highest peak is larger than the area threshold value.
Step S208, determining a corresponding triangular area according to the first point, the second point and the vertex.
Step S209 determines a first angle and a second angle corresponding to two base angles of the triangular region.
Step S210, determining that an absolute value of a difference between the first angle and the second angle is greater than an angle threshold.
In step S211, the reflected signal is identified as an interference signal.
Specifically, after the water dispenser generates a time domain curve, a corresponding triangular area is determined according to a first point, a second point and a vertex of a highest peak, a first angle and a second angle respectively corresponding to two base angles of the triangular area are determined, the first angle and the second angle are subjected to difference operation, after a difference value between the first angle and the second angle is obtained, an absolute value of the difference value is compared with an angle threshold, and when the absolute value of the difference value is greater than the angle threshold, a reflected signal is determined to be an interference signal.
In this embodiment, after a part of invalid interference signals are filtered by setting a peak threshold, an interval area covering the highest peak is compared with the area threshold, after the interval area is determined to be greater than the area threshold, an absolute value of a difference between two base angles of a triangular region formed by a first point, a second point and a vertex is compared with an angle threshold, and after the interval area is determined to be greater than the angle threshold, a reflection signal is identified as an interference signal to control the water dispenser to stop water discharge. According to the method, while the hardware cost is reduced, original hardware of the water dispenser is not changed, multidimensional characteristic signals are extracted based on existing basic time domain signals through a software algorithm and a mathematical model, and a model belonging to interference signals is established, 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 present invention. As shown in fig. 3, in the embodiment of the present invention, a method for identifying an interference signal is provided, which is described by taking the method as an example of being applied to a water dispenser including an ultrasonic detector, and the method may include the following steps:
step S301, a reflected signal received by the ultrasonic probe is acquired.
Specifically, the water dispenser transmits an ultrasonic signal through a probe of the ultrasonic detector, when the water dispenser has an obstacle, the ultrasonic detector of the water dispenser receives a reflected signal 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 S302, determining that the amplitude of the peak of the reflected signal in the preset time region is greater than or equal to a peak threshold value.
Specifically, before the interference signal is formally identified by the water dispenser, the peak of the reflected signal in the preset time region is compared with a preset peak threshold, and after the amplitude of the peak of the reflected signal in the preset time region is determined to be greater than or equal to the peak threshold, the step S303 is performed, otherwise, the reflected signal is determined to be an invalid signal, namely a tiny useless interference signal.
Step S303, determining the highest peak with the largest amplitude among peaks of the reflected signal in the preset time region.
Specifically, the water dispenser generates a time domain curve of relevant time (namely, distance from the probe) and amplitude according to the received reflection signal, and determines the highest peak with the maximum amplitude in the peaks of the reflection signal in a preset region (namely, a receiving region) by acquiring the amplitude of the peak.
In step S304, a first point and a second point, which are closest to the highest peak and have amplitudes equal to a threshold value, in the reflected signal are determined.
Specifically, under the condition that a plurality of continuous wave crests exist in a preset time region and one wave crest is the highest wave crest, the water dispenser determines a first point and a second point, wherein the amplitude value closest to the highest wave crest is equal to a critical value.
In one example, the threshold value may be equal to the peak threshold value.
In step S305, the peak of the highest peak is determined.
Specifically, the water dispenser determines the position of the peak of the highest peak in a preset time region.
Step S306, determining an area of the section according to a distance between the first point and the second point and a distance between the vertex and the threshold.
Specifically, 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 side lengths (or the length and the width) of the rectangle, the water dispenser may use the product value of the two distances as the interval area.
Step S307, it is determined that the section area is larger than the area threshold.
Specifically, the water dispenser compares the interval area with an area threshold value, so as to determine that the interval area of the highest peak is larger than the area threshold value.
In step S308, 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 are determined.
In step S309, it is determined 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 a first slope of a straight line formed by a first point and a vertex and a second slope of a straight line formed by a second point and the vertex, for example, a corresponding trigonometric function value (e.g., a tangent value) can be determined by a coordinate of the first point and a coordinate of the vertex and a coordinate of the second point and a coordinate of the vertex to determine a slope value, thereby determining the first slope and the second slope, performing a difference operation on an absolute value of the first slope and an absolute value of the second slope, after obtaining a difference value between the first slope and the second slope, comparing the difference value with a slope threshold, and when determining that the difference value is greater than the slope threshold, determining that the reflected signal is an interference signal.
In this embodiment, after a part of invalid interference signals are filtered by setting a peak threshold, an interval area covering the highest peak is compared with the area threshold, after the interval area is determined to be greater than the area threshold, 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 is compared with the slope threshold, and after the difference is determined to be greater than the slope threshold, a reflected signal is identified as an interference signal to control the water dispenser to stop discharging water. According to the method, while the hardware cost is reduced, original hardware of the water dispenser is not changed, multidimensional characteristic signals are extracted based on existing basic time domain signals through a software algorithm and a mathematical model, and a model belonging to interference signals is established, 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 is a block diagram schematically illustrating an apparatus for identifying an interference signal according to an embodiment of the present invention. As shown in fig. 4, in an embodiment of the present invention, an apparatus 400 for identifying an interference signal is provided, including: an ultrasound 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 value in peaks of the reflected signal in a preset time region; determining the interval area 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 interference signal.
It is understood that the reflected signal is a sound wave signal reflected by the ultrasonic wave emitted by the ultrasonic detector when the ultrasonic wave encounters an obstacle. The working principle of the ultrasonic detector is to judge the attribute type of an obstacle by transmitting ultrasonic waves and receiving the sound waves reflected by the obstacle when the ultrasonic waves encounter the obstacle. The preset time zone is a time zone which is formed by the reflected signals and represents the reflected signals of the water receiving zone of the water dispenser, furthermore, the time zone can be divided into three zones, including a transmitting zone which represents the reflected signals of a zone close to the probe of the ultrasonic detector, a receiving zone which represents the reflected signals of the water receiving zone of the water dispenser and a water receiving platform zone which represents the reflected signals of the water receiving platform zone of the water dispenser, the water receiving platform zone on the time zone is mainly used for obtaining a reference height, and data behind the water receiving platform zone is generally regarded as invalid data. The interval area is an interval area covering a peak, that is, an area of a peak in a certain reflection interval (for example, a strong reflection interval) on the symbolic time domain curve, and may be, for example, an area of a rectangular interval covering a peak on the time domain curve. The area threshold is the area critical value of the preset water dispenser for judging whether the water dispenser is an interference signal. The interference signal is a signal that a detected object appears in a detection area and is a non-water taking appliance, namely a water using signal which is invalid for the ultrasonic water dispenser, such as a hand signal.
Specifically, the water dispenser transmits an ultrasonic signal through a probe of the ultrasonic detector, when the water dispenser has an obstacle, the ultrasonic detector of the water dispenser receives a reflected signal 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 relevant time (namely, the distance between the water dispenser and the probe) and amplitude according to the received reflection signal, and determines the highest peak with the maximum amplitude in the peaks of the reflection signal in a preset area (namely, a receiving area) by acquiring the amplitude of the peaks. The water dispenser determines the area of the interval covering the highest peak by determining the area of the highest peak in a certain reflection interval (for example, a strong reflection interval). The water dispenser can compare the interval area with the area threshold value, so that the interval area of the highest peak is determined to be larger than the area threshold value. For example, in a scene that a user wipes the water dispenser with a hand or the user extends the 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 a time domain curve in a preset time region is greater than an area threshold.
The device for identifying the interference signal determines the highest peak with the maximum amplitude in the peaks of the reflected signal in the preset time region by acquiring the reflected signal received by the ultrasonic detector, determines the interval area covering the highest peak according to the highest peak, when the area of the interval is determined to be larger than the area threshold, the reflected signal is identified as an interference signal without the help of other hardware such as sensors, can distinguish interference signals (such as human hands) from non-interference signals (such as cups), reduces the hardware cost, does not change the original hardware of the water dispenser, through a software algorithm and a mathematical model, based on the existing basic time domain signal, a multidimensional characteristic signal is extracted, and a model belonging to an interference signal is established, so that the accuracy of a recognition result is improved, the false triggering probability of the water dispenser is reduced, and the safety of the water dispenser in the use process 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 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 lower limit value of the amplitude of a certain reflection interval (e.g., a strong reflection interval) set in advance. The first point is one of the points in the time domain curve whose amplitude nearest to the highest peak is equal to the critical value, and the second point is the other point in the time domain curve whose amplitude nearest to the highest peak is equal to the critical value.
Specifically, under the condition that a plurality of continuous wave crests exist in a preset time region and one wave crest is the highest wave crest, the water dispenser determines a first point and a second point, wherein the amplitude value closest to the highest wave crest is equal to a critical value, and further determines the peak of the highest wave crest (including the amplitude value of the peak), so that the area of an interval is determined according to the distance between the first point and the second point and the distance between the amplitude value of the peak and the critical value.
In one embodiment, the processor 420 is further configured to: the product of the distance between the first point and the second point and the distance between the vertex and the critical value is determined to determine the area of the interval.
Specifically, after the distance between the first point and the second point and the distance between the vertex and the critical value are determined, that is, after two adjacent side lengths (or the length and the width) of the rectangle are determined, the product value of the two distances is used as the section area.
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 region is greater than or equal to a peak threshold value.
It is understood that the peak threshold is the lowest peak amplitude preset in the filtering process to indicate that the signal is valid, that is, the reflected signal whose peak amplitude is smaller than the peak threshold may be determined in advance as a small unwanted interference signal, the signal may be filtered in advance, and only the peak whose peak amplitude is greater than or equal to the peak threshold is determined as valid data.
Specifically, before the water dispenser formally identifies the interference signal, the peak of the reflected signal in the preset time region is compared with a preset peak threshold, after the amplitude of the peak of the reflected signal in the preset time region is determined to be greater than or equal to the peak threshold, the step of determining the highest peak of the reflected signal with the largest amplitude in the peaks in the preset time region is performed, and otherwise, the reflected signal is determined to be an invalid signal, namely a tiny useless interference signal.
According to the device in the embodiment, invalid reflected signals can be filtered by setting a peak threshold value in advance, most of tiny useless interference signals are basically removed, the efficiency of interference signal identification can be improved, and the time of model identification is shortened.
In one embodiment, the processor 420 is further configured to: determining a corresponding triangular 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 area; 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 interference signal.
It will be appreciated that the first angle is the value of one of the base angles of the triangular region and the second angle is the value of the other base angle of the triangular region. The angle threshold is the minimum of the difference of the two base angles of the triangular region.
Specifically, after the water dispenser generates a time domain curve, a corresponding triangular area is determined according to a first point, a second point and a vertex of a highest peak, a first angle and a second angle respectively corresponding to two base angles of the triangular area are determined, the first angle and the second angle are subjected to difference operation, after a difference value between the first angle and the second angle is obtained, an absolute value of the difference value is compared with an angle threshold, when the absolute value of the difference value is greater than the angle threshold, a reflected signal is determined to be an interference signal (for example, a human hand), and otherwise, the reflected signal is regarded as a non-interference signal (for example, a cup).
The device in this embodiment, through setting up the angle threshold value, the difference size between first angle and the second angle of comparison, discernment reflection signal is 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 of interference signal discernment, guarantees the security of water dispenser use.
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 an absolute value of the first slope and an absolute value of the second slope is greater than a slope threshold; the reflected signal is identified as an interference signal.
It is understood that the first slope is a slope of a line formed by connecting the first point and the vertex, and the second slope is a slope of a line formed by connecting the second point and the vertex. The slope threshold is a lower limit value of the difference in absolute values of the slopes.
Specifically, the water dispenser determines a first slope of a straight line formed by a first point and a vertex and a second slope of a straight line formed by a second point and the vertex, for example, a corresponding trigonometric function value (e.g., a tangent value) can be determined by a coordinate of the first point and a coordinate of the vertex and a coordinate of the second point and a coordinate of the vertex to determine a slope value, thereby determining the first slope and the second slope, 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 the difference value between the first slope and the second slope, determining the reflected signal as an interference signal (e.g., a human hand) when the difference value is greater than the slope threshold, and considering the reflected signal as a non-interference signal (e.g., a cup) otherwise.
The device in the embodiment compares the difference value between the absolute value of the first slope and the absolute value of the second slope by setting the slope threshold, identifies the reflected signal as the interference signal when the difference value is greater than the slope threshold, can distinguish the interference signal from the non-interference signal, further improves the accuracy of identifying the interference signal, and ensures the safety of the water dispenser in the using process.
The device for identifying the interference signal comprises a processor and a memory, wherein the processor comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel may be set one or more, and used to identify the interfering signal by adjusting kernel parameters.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or nonvolatile memory such as Read Only Memory (ROM) or flash memory (flash RAM), and the memory includes at least one memory chip.
An embodiment of the present invention provides a processor configured to execute the method for identifying an interference signal according to the foregoing embodiments.
The embodiment of the invention provides a water dispenser which comprises a device for identifying interference signals according to the embodiment.
An embodiment of the present invention provides a machine-readable storage medium, which stores instructions thereon, and when executed by a processor, causes the processor to execute the method for identifying an interference signal according to the foregoing embodiment.
The present application also provides a computer program product adapted to perform a program initialized with the method for identifying an interfering signal of the above embodiments when executed on a data processing device.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The 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 computer storage media 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 that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
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 an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (15)
1. A method for identifying an interfering signal for use with a water dispenser including an ultrasonic detector, the method comprising:
acquiring a reflected signal received by the ultrasonic detector;
determining the highest peak with the largest amplitude value in peaks of the reflected signal in a preset time region;
determining the interval area 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 interference signal.
2. The method of claim 1, wherein the determining the inter-zone area comprises:
determining a first point and a second point which are closest to the highest peak in the reflected signal and have amplitude equal to a critical value;
determining a vertex of the highest peak;
and determining the interval area according to the distance between the first point and the second point and the distance between the top point and the critical value.
3. The method of claim 2, wherein determining the span area based on the distance between the first and second points and the distance between the vertex and the threshold value comprises:
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.
4. The method of claim 1, wherein the determining the highest peak of the reflected signals having the largest amplitude in the preset time region further comprises:
determining that the amplitude of the peak of the reflected signal in a preset time region is greater than or equal to a peak threshold value.
5. The method of claim 2, further comprising:
determining a corresponding triangular 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 area;
determining that an absolute value of a difference between the first angle and the second angle is greater than an angle threshold;
identifying the reflected signal as an interference signal.
6. The method of claim 2, further comprising:
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 an absolute value of the first slope and an absolute value of the second slope is greater than a slope threshold;
identifying the reflected signal as an interference signal.
7. A processor, characterized in that the processor is configured to perform the method for identifying an interfering signal according to any one of claims 1 to 6.
8. An apparatus for identifying an interfering signal, comprising:
an ultrasonic detector; and
a processor configured to:
acquiring a reflected signal received by the ultrasonic detector;
determining the highest peak with the largest amplitude value in peaks of the reflected signal in a preset time region;
determining the interval area 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 interference signal.
9. The apparatus of claim 8, wherein 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 amplitude equal to a critical value;
determining a vertex of the highest peak;
and determining the interval area according to the distance between the first point and the second point and the distance between the top point and the critical value.
10. The apparatus of claim 9, wherein the processor is further configured to:
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.
11. The apparatus of claim 8, wherein the processor is further configured to:
determining that the amplitude of the peak of the reflected signal in a preset time region is greater than or equal to a peak threshold value.
12. The apparatus of claim 9, wherein the processor is further configured to:
determining a corresponding triangular 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 area;
determining that an absolute value of a difference between the first angle and the second angle is greater than an angle threshold;
identifying the reflected signal as an interference signal.
13. The apparatus of claim 9, wherein 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 an absolute value of the first slope and an absolute value of the second slope is greater than a slope threshold;
identifying the reflected signal as an interference signal.
14. A water dispenser, characterized in that it comprises a device for identifying interfering signals according to any one of claims 8 to 13.
15. A machine-readable storage medium having instructions stored thereon, which when executed by a processor causes the processor to perform the method for identifying an interfering signal according to any one of claims 1 to 6.
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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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| WO2022134694A1 (en) * | 2020-12-24 | 2022-06-30 | 佛山市顺德区美的饮水机制造有限公司 | Method and apparatus for identifying interference signal, and storage medium and processor |
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| 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 |
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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 | A kind of intelligent drinking machine and its control method |
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