CN112098928B - Method, apparatus, server and computer readable storage medium for determining contactor - Google Patents
Method, apparatus, server and computer readable storage medium for determining contactor Download PDFInfo
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- CN112098928B CN112098928B CN202010495096.9A CN202010495096A CN112098928B CN 112098928 B CN112098928 B CN 112098928B CN 202010495096 A CN202010495096 A CN 202010495096A CN 112098928 B CN112098928 B CN 112098928B
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Classifications
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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
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/80—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic or infrasonic waves
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
- H04W4/029—Location-based management or tracking services
Abstract
The embodiment of the invention discloses a method, a device, a server and a computer readable storage medium for determining a contactor. The method is suitable for the first intelligent device, and comprises the following steps: receiving an ultrasonic signal from the second smart device containing an identification of the second smart device; analyzing the identification of the second intelligent device from the ultrasonic signal; and when a preset reporting condition is met, sending reporting information containing the identification of the second intelligent device to a server, wherein the server determines the user corresponding to the identification of the second intelligent device as a contact of the user of the first intelligent device. The embodiment of the invention realizes automatic determination of the contactor, and can also determine the key contactor based on the relative angle.
Description
Technical Field
Embodiments of the present invention relate to the field of positioning technology, and more particularly, to a method, apparatus, server, and computer-readable storage medium for determining a contactor.
Background
In epidemic prevention and control, finding the contact person of an infected person is a key link, and timely screening is helpful for controlling disease spread. Traditional contact tracking relies primarily on manual interrogation. Medical workers or public health authorities attempt to learn the travel history, flow path, and vehicles taken for each patient diagnosed in an effort to find the contact of the infected person.
However, manual interrogation has the disadvantage of being inaccurate and inefficient.
Disclosure of Invention
Embodiments of the present invention provide methods, apparatus, servers and computer readable storage media for determining contactors.
The technical scheme of the embodiment of the invention is as follows:
a method of determining a contactor, the method being applicable to a first smart device, the method comprising:
receiving an ultrasonic signal from the second smart device containing an identification of the second smart device;
analyzing the identification of the second intelligent device from the ultrasonic signal;
and when a preset reporting condition is met, sending reporting information containing the identification of the second intelligent device to a server, wherein the server determines the user corresponding to the identification of the second intelligent device as a contact of the user of the first intelligent device.
In one embodiment, the identification of the second smart device includes a media access control address, an international mobile subscriber identity, or an international mobile equipment identity of the second smart device.
In one embodiment, the second intelligent device sends the ultrasonic signal according to a preset period, and the first intelligent device records each receiving time of the ultrasonic signal and further includes the each receiving time in the reported information;
And the server determines the continuous contact time of the user of the first intelligent device and the user of the second intelligent device based on the receiving time each time, and determines the user of the second intelligent device as an important contactor when the continuous contact time is larger than a preset threshold value.
In one embodiment, the first smart device includes a first sound detection module and a second sound detection module; the second intelligent device sends the ultrasonic signal according to a preset period;
the method further comprises the steps of: determining a time difference between a time of receipt of a first ultrasonic signal directly reaching the first sound detection module and a time of receipt of a second ultrasonic signal directly reaching the second sound detection module; determining a relative angle between the first smart device and the second smart device based on a distance between the first sound detection module and the second sound detection module and the time difference; wherein the first ultrasonic signal and the second ultrasonic signal are contained in ultrasonic signals transmitted by a second smart device at the same point in time; the relative angle is further contained in the reported information; wherein the user of the second smart device is determined to be the accent contactor when the server determines that the relative angle is within a predetermined range of angles.
An apparatus for determining a contactor, the apparatus adapted for use with a first smart device, the apparatus comprising:
a receiving module for receiving an ultrasonic signal from the second smart device containing an identification of the second smart device;
the analysis module is used for analyzing the identification of the second intelligent device from the ultrasonic signal;
and the reporting module is used for sending reporting information containing the identification of the second intelligent device to a server when a preset reporting condition is met, wherein the server determines the user corresponding to the identification of the second intelligent device as a contact of the user of the first intelligent device.
In one embodiment, the identification of the second smart device includes a media access control address, an international mobile subscriber identity, or an international mobile equipment identity of the second smart device.
In one embodiment, wherein the second smart device transmits the ultrasonic signal at a predetermined period;
the reporting module is used for recording each receiving time of the ultrasonic signal and further comprises the each receiving time in the reporting information;
and the server determines the continuous contact time of the user of the first intelligent device and the user of the second intelligent device based on the receiving time each time, and determines the user of the second intelligent device as an important contactor when the continuous contact time is larger than a preset threshold value.
In one embodiment, the receiving module includes a first sound detection module and a second sound detection module; the second intelligent device sends the ultrasonic signal according to a preset period;
the reporting module is further used for determining the time difference between the receiving time of the first ultrasonic signal reaching the first sound detection module and the receiving time of the second ultrasonic signal reaching the second sound detection module; determining a relative angle between the first smart device and the second smart device based on a distance between the first sound detection module and the second sound detection module and the time difference; wherein the first ultrasonic signal and the second ultrasonic signal are contained in ultrasonic signals transmitted by a second smart device at the same point in time; the relative angle is further contained in the reported information;
wherein the user of the second smart device is determined to be the accent contactor when the server determines that the relative angle is within a predetermined range of angles.
A server, comprising: the receiving module is used for receiving reporting information from the first intelligent equipment, wherein the reporting information comprises the identification of the second intelligent equipment; the first intelligent device receives an ultrasonic signal containing the identification of the second intelligent device from the second intelligent device, analyzes the identification of the second intelligent device from the ultrasonic signal, and sends the reporting information to a server when a preset reporting condition is met; a determination module for determining a user corresponding to the identity of the second smart device as a contact of the user of the first smart device.
A computer readable storage medium having stored therein computer readable instructions for performing the method of determining a contactor as claimed in any one of the preceding claims.
From the above technical solution, it can be seen that the embodiment of the present invention realizes automatic determination of the contactor. And, further in combination with angle recognition, the key contactor can be determined.
Drawings
FIG. 1 is an exemplary flow chart of a method for determining a relative angle between smart devices according to the present invention.
Fig. 2 is a schematic diagram of the principle of determining the relative angle between intelligent devices according to the present invention.
Fig. 3 is a schematic diagram of calculating a relative angle between intelligent devices according to the present invention.
FIG. 4 is a first exemplary schematic diagram of the present invention for determining a pair of direct signals.
FIG. 5 is a second exemplary schematic diagram of the present invention for determining a pair of direct signals.
Fig. 6 is a schematic diagram of a first exemplary arrangement of a first sound detection module and a second sound detection module of the present invention in a smart device.
Fig. 7 is a second exemplary arrangement diagram of the first sound detection module and the second sound detection module of the present invention in a smart device.
FIG. 8 is a schematic diagram of the relative positioning of a first smart device and a second smart device of the present invention.
FIG. 9 is a schematic diagram showing the relative angles in the smart device interface according to the present invention.
FIG. 10 is a flow chart of an exemplary process for relative positioning between intelligent devices according to the present invention.
FIG. 11 is a flow chart of a method for determining a contactor according to the present invention.
Fig. 12 is a schematic diagram of the invention for determining duration.
Fig. 13 is a system configuration diagram of the invention for determining a contactor.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
In order to realize relative direction positioning between intelligent devices by using software without adding hardware, so that the relative positioning has universality, devices of different manufacturers can realize interoperation and mutual compatibility, and based on the innovative application of exploring the intelligent devices, the embodiment of the invention provides a relative direction recognition scheme between the intelligent devices based on sound (preferably ultrasound), the relative direction recognition between two intelligent devices can be realized by using software without adding hardware, and the positioning result is accurate and reliable.
First, the smart device (intelligent device) refers to any device, appliance, or machine having computing processing capabilities. FIG. 1 is an exemplary flow chart of a method for determining a relative angle between smart devices according to the present invention. The method is applicable to a first intelligent device, and the first intelligent device comprises a first sound detection module and a second sound detection module. The first sound detection module and the second sound detection module are fixedly installed in the first smart device. For example, the first sound detection module may be implemented as a microphone or a set of microphone arrays arranged in the first smart device. Likewise, the second sound detection module may be implemented as a microphone or a set of microphone arrays arranged in the first smart device that are different from the first sound detection module.
As shown in fig. 1, the method includes:
step 101: enabling the first sound detection module to detect a first sound signal which is sent out by the second intelligent device and directly reaches the first sound detection module, and enabling the second sound detection module to detect a second sound signal which is sent out by the second intelligent device and directly reaches the second sound detection module, wherein the first sound signal and the second sound signal are sent out by the second intelligent device at the same time.
Here, the second smart device may emit one sound signal or a plurality of sound signals at the same time.
Such as: when the second intelligent device emits a sound signal, the first sound detection module and the second sound detection module in the second intelligent device respectively detect the sound signal. Wherein: the detection signal, which is detected by the first sound detection module and directly reaches the first sound detection module, is determined as a first sound signal; the detection signal detected by the second sound detection module, the sound signal being directed to the first sound detection module, is determined as the second sound signal. For another example, when the second smart device emits a plurality of sound signals simultaneously, such as an ultrasonic signal and an audible sound signal. The first sound detection module in the second smart device is adapted to detect an ultrasonic signal and the second sound detection module is adapted to detect an audible sound signal. The first sound detection module detects the ultrasonic signal and the second sound detection module detects the audible sound signal. Wherein: the detection signal, which is detected by the first sound detection module and is detected by the ultrasonic signal to be directly transmitted to the first sound detection module, is determined as a first sound signal; the audible sound signal detected by the second sound detection module is directed to the detection signal of the second sound detection module and is determined as the second sound signal.
In other words, the first sound signal and the second sound signal may be separate detection signals of the first sound detection module and the second sound detection module for the same sound signal emitted by the second smart device. Or, the first sound signal and the second sound signal may be separate detection signals of different sound signals sent by the first sound detection module and the second sound detection module for the second smart device at the same time.
Step 102: a time difference between the time of receipt of the first sound signal and the time of receipt of the second sound signal is determined.
Here, the first smart device (e.g., a CPU in the first smart device) may record the reception timing of the first sound signal and the reception timing of the second sound signal, and calculate a time difference therebetween.
Step 103: based on the distance and the time difference between the first sound detection module and the second sound detection module, a relative angle between the first smart device and the second smart device is determined.
For example, step 103 may be performed by the CPU of the first smart device. In one embodiment, determining the relative angle between the first smart device and the second smart device in step 103 includes: based on Determining theta; wherein arcsin is an arcsin function, d=t×c, t is the time difference, c is the propagation speed of sound, and D is the distance between the first sound detection module and the second sound detection module; determining a relative angle between the first smart device and the second smart device based on θ>Wherein->The time difference determined in step 102 may be positive or negative. When the value of the time difference is positive, the receiving time of the second sound signal is earlier than the receiving time of the first sound signal, so that the relative angle phi between the first intelligent device and the second intelligent device is usually an acute angle; when the value of the time difference is negative, the receiving time of the first sound signal is earlier than the receiving time of the second sound signal, so the relative angle phi between the first smart device and the second smart device is usually an obtuse angle.
In an embodiment of the invention, the first sound signal is a signal directly reaching the first sound detection module from the second intelligent device, and the second sound signal is a signal directly reaching the second sound detection module from the second intelligent device. In fact, either the first sound detection module or the second sound detection module may receive a signal (e.g., one reflection or multiple transmissions through an obstacle) that is emitted from the second smart device and is indirect. Therefore, it is significant how to determine the direct signal from the received plurality of signals.
The applicant found that: typically, the received signal stream (foam) of each sound detection module contains both direct channels and reflected channels. The direct channel can be determined simply and conveniently according to the following principle: of all the signals detected by the sound detection module, the signal strength of the direct channel is typically the strongest. Thus, in one embodiment, the method further comprises: the first sound detection module receives sound signals with the intensity larger than a preset threshold value in a preset time window in a sound signal stream of the second intelligent device, and determines the sound signals as the first sound signals; and determining that the second sound detection module receives the sound signals, in the sound signal stream of the second intelligent device, with the intensity greater than the preset threshold value within the preset time window, as the second sound signals.
FIG. 4 is a first exemplary schematic diagram of the present invention for determining a pair of direct signals. In fig. 4, the sound signal stream detected by the first sound detection module is a beam 1, the beam 1 includes a plurality of pulse signals varying along time (T), and the threshold value of the predetermined signal strength is T. It can be seen that the signal strength of the pulse signal 50 in the beam 1 is greater than the threshold value T within the time window 90. The sound signal stream detected by the second sound detection module is a stream 2, the stream 2 comprises a plurality of pulse signals which change along time (T), and the threshold value of the preset signal strength is also T. It can be seen that the signal strength of the pulse signal 60 in the beam 2 is greater than the threshold value T within the time window 90. Accordingly, the pulse signal 50 is determined to be the first sound signal; the pulse signal 60 is a second sound signal.
In addition, the applicant has found that: the direct channel can be accurately determined by comprehensively considering the following two principles: in principle (1), among all signals detected by the sound detection module, the signal intensity of the direct channel is generally strongest; principle (2), combined discrimination: the distance difference d converted from the arrival time difference of the two direct channel signals (the first sound signal and the second sound signal) should not be larger than the distance between the first sound detection module and the second sound detection module. Thus, in one embodiment, the method further comprises: detecting sound signals with the intensity larger than a preset threshold value in a sound signal stream of the second intelligent device by a first sound detection module so as to form a first candidate signal set; detecting sound signals with the intensity larger than the preset threshold value in a sound signal stream of the second intelligent device by a second sound detection module to form a second candidate signal set; determining a respective time difference between the time of receipt of each sound signal in the first candidate signal set and the time of receipt of each sound signal in the second candidate signal set; and determining a pair of sound signals with the time difference smaller than M as the first sound signal and the second sound signal, wherein M= (D/c), D is the distance between the first sound detection module and the second sound detection module, and c is the propagation speed of sound.
FIG. 5 is a second exemplary schematic diagram of the present invention for determining a pair of direct signals. In fig. 5, the sound signal stream detected by the first sound detection module is a beam 1, the beam 1 includes a plurality of pulse signals varying along time (T), and the threshold value of the predetermined signal strength is T. It can be seen that in the foam 1, the signal strength of the pulse signal 50 is greater than the threshold value T, and thus the first candidate signal set includes the pulse signal 50. The sound signal stream detected by the second sound detection module is a stream 2, the stream 1 comprises a plurality of pulse signals which change along time (T), and the threshold value of the preset signal strength is also T. It can be seen that in beam 2, the signal strengths of both pulse signal 60 and pulse signal 70 are greater than threshold value T, so the second candidate signal set comprises pulse signal 60 and pulse signal 70.
Also, a time difference d1 between the reception timings of the pulse signals 50 in the first candidate signal set and the pulse signals 60 in the second candidate signal set is determined, and a time difference d2 between the reception timings of the pulse signals 50 in the first candidate signal set and the pulse signals 70 in the second candidate signal set is determined. Assuming that D1 is smaller than M and D2 is larger than M, where m= (D/c), D is the distance between the first sound detection module and the second sound detection module, and c is the propagation speed of sound. Accordingly, the pulse signal 50 of the pair of sound signals related to d1 is determined as the first sound signal, and the pulse signal 60 of the pair of sound signals is determined as the second sound signal.
Preferably, the first sound signal and the second sound signal are ultrasonic waves having a code division multiple access format and include a media access control address (MAC) of the second smart device. Thus, the first smart device can accurately identify the source of the sound signal based on the MAC address of the second smart device contained in the sound signal. When a plurality of sound sources emitting sound signals exist in the environment, the first intelligent device can accurately determine the relative angle with the sound source by using two direct signals from the same sound source based on the MAC address in the extracted sound signals, and the relative angle is not interfered by other sound sources.
The embodiment of the invention also provides a method for determining the relative angle between the intelligent devices. The method is applicable to a first intelligent device, the first intelligent device comprises a first sound detection module and a second sound detection module, and the method comprises the following steps: determining a first moment when an ultrasonic signal sent by a second intelligent device directly reaches a first sound detection module; determining a second moment when the ultrasonic signal directly reaches the second sound detection module; determining a time difference between the first time and the second time; based on the distance and the time difference between the first sound detection module and the second sound detection module, a relative angle between the first smart device and the second smart device is determined. In one embodiment, determining the relative angle between the first smart device and the second smart device includes: based on Determining theta; wherein arcsin is an arcsin function, d=t×c, t is a time difference, c is a propagation speed of sound, and D is a distance between the first sound detection module and the second sound detection module; determining a relative angle between the first smart device and the second smart device based on θ>Wherein->
In one embodiment, the method further comprises at least one of the following treatments:
(1) The first sound detection module receives ultrasonic signals with the intensity larger than a preset threshold value in an ultrasonic signal stream of the second intelligent device within a preset time window, the ultrasonic signals are determined to be ultrasonic signals reaching the first sound detection module, and the moment of receiving the ultrasonic signals reaching the first sound detection module is determined to be the first moment; and determining the ultrasonic signal with the intensity larger than the preset threshold value in the preset time window in the ultrasonic signal flow of the second intelligent device received by the second sound detection module as the ultrasonic signal of the direct second sound detection module, and determining the moment of receiving the ultrasonic signal of the direct second sound detection module as the second moment.
(2) Detecting an ultrasonic signal with intensity greater than a preset threshold value in an ultrasonic signal flow of second intelligent equipment by a first sound detection module to form a first candidate signal set; detecting ultrasonic signals with the intensity larger than the preset threshold value in the ultrasonic signal flow of the second intelligent device by the second sound detection module so as to form a second candidate signal set; determining a respective time difference between the time of receipt of each ultrasonic signal in the first candidate signal set and the time of receipt of each ultrasonic signal in the second candidate signal set; the receiving time of a pair of ultrasonic signals with the time difference smaller than M is determined as a first time and a second time, wherein M= (D/c), D is the distance between the first sound detection module and the second sound detection module, and c is the propagation speed of sound.
The principles and calculation procedure of the relative positioning of the present invention are exemplarily described below. Fig. 2 is a schematic diagram of the principle of determining the relative angle between intelligent devices according to the present invention. Fig. 3 is a schematic diagram of calculating a relative angle between intelligent devices according to the present invention. As shown in fig. 2, a microphone a1 disposed at the bottom of the smart device a emits an ultrasonic signal containing the MAC address of the smart device a, the smart device B (not shown in fig. 2) has two microphones disposed apart,microphone b1 and microphone b2, respectively. Wherein: microphone b1 receives the direct signal L1 of the ultrasonic signal and microphone b2 receives the direct signal L2 of the ultrasonic signal. The ultrasonic signals reach indirect signals of the microphone b1 and the microphone b2 after being transmitted by the obstacle, and do not participate in subsequent relative angle calculation. Because the intelligent devices are smaller, especially when the two intelligent devices are far apart, the direct signal L 1 、L 2 Can be considered as parallel lines.
As shown in FIG. 3, L 1 、L 2 Direct signals (signals not reflected by obstacles) received by microphones B1 and B2 of the smart device B are represented respectively; d is the distance between microphone b1 and microphone b2. For example, if the microphone B1 and the microphone B2 are respectively disposed at the upper and lower ends of the smart device B, D may be the length of the smart device B; from microphone b2 to direct signal L 1 The distance between the foot and the microphone b1 is d, d is L 1 And L 2 Can determine the direct signal L by using the correlation algorithm of the signals 1 Relative to the direct signal L 2 D may be calculated based on the delay time difference t, where d=t×c, c being the propagation velocity of sound in a medium (such as air); θ is the auxiliary angle, whereTherefore, the relative angle of the smart device A and the smart device B can be calculated>Wherein->Preferably, smart device a and smart device B may be implemented as at least one of: a smart phone; a tablet computer; a smart watch; an intelligent bracelet; an intelligent sound box; an intelligent television; an intelligent earphone; intelligent robots, and the like.
The first sound detection module and the second sound detection module may be arranged at a plurality of locations of the smart device. Fig. 6 is a schematic diagram of a first exemplary arrangement of a first sound detection module and a second sound detection module of the present invention in a smart device. In fig. 6, the first sound detection module 18 and the second sound detection module 19 are disposed at both ends of the smart device in the length direction, respectively, and thus the length D of the smart device can be directly determined as the distance between the first sound detection module 18 and the second sound detection module 19. Fig. 7 is a second exemplary arrangement diagram of the first sound detection module and the second sound detection module of the present invention in a smart device. In fig. 7, the first sound detection module 18 and the second sound detection module 19 are disposed at both ends of the smart device in the width direction, respectively, and thus the width D of the smart device can be directly determined as the distance between the first sound detection module 18 and the second sound detection module 19.
The foregoing exemplary description of the arrangement of the first and second sound detection modules in the smart device is merely exemplary and is not intended to limit the scope of embodiments of the present invention, as those skilled in the art will appreciate. In fact, currently smart devices typically have two sets of microphones, which can be used in embodiments of the present invention as a first sound detection module and a second sound detection module without having to change the smart device in hardware.
A typical example of calculating a relative angle between smart devices using ultrasound according to an embodiment of the present invention is described below. FIG. 8 is a schematic diagram of the relative positioning of a first smart device and a second smart device of the present invention. FIG. 10 is a flow chart of an exemplary process for relative positioning between intelligent devices according to the present invention. In fig. 7, the respective processing paths of two combined microphones detecting sound signals are illustrated, wherein an Analog-to-Digital Converter (ADC) is a device that converts a continuously variable Analog signal into a discrete digital signal; a band-pass filter (BPF) is a device that allows waves of a specific frequency band to pass while shielding other frequency bands. The relative direction identification step between two intelligent devices based on ultrasound comprises the following steps:
The first step: the first smart device transmits a positioning signal in ultrasound format, which comprises the Mac address of the smart device 1.
And a second step of: the two groups of microphones of the second intelligent device respectively detect positioning signals, resolve Mac addresses from the respective detected positioning signals, and confirm that the respective detected positioning signals originate from the same sound source based on the Mac addresses.
And a third step of: the second intelligent device calculates a distance difference d between two direct signals of the positioning signal based on time differences between the two direct signals detected by two groups of microphones respectively included in the second intelligent device.
Fourth step: second smart device computingThe signal incidence angle +.>The relative angle between the first intelligent device and the second intelligent device is the relative angle, wherein D is the distance between the two groups of microphones in the second intelligent device.
Fifth step: the second intelligent device displays the relative angle on the display interface of the second intelligent deviceThereby prompting the user for the relative orientation of the first smart device. For example, fig. 9 is a schematic diagram showing the relative angles in the smart device interface according to the present invention.
By way of example, assume that in the environment shown in fig. 8, the first smart device is embodied as a smart speaker and the first smart device is embodied as a smart phone.
Step one: the intelligent sound box transmits an ultrasonic signal which comprises the Mac address of the intelligent sound box and is a signal based on a CDMA (code division multiple Access) technical architecture.
Step two: the two groups of microphone arrays of the smart phone receive ultrasonic signals and calculate Mac addresses of the smart sound box, and meanwhile, the smart phone calculates a distance difference d between two direct signals of the two groups of microphone arrays. Wherein: assuming that direct signals with signal intensity peaks larger than a threshold value T exist in the received signal streams stream1 and stream2 of the two groups of gram wind arrays respectively, so that principle 1 is satisfied; re-assumeTime difference of arrival of the two direct signalsCalculating d corresponding to the Δt, wherein +.>The two sets of microphone distances D are known (i.e. handset length), assuming 0.145m, and D < D is visible, thus meeting principle 2. Thus, the two direct signals may be selected to calculate the relative angle, where d=0.014 (m).
Step three: smart phone computingThen the angle of incidence of the signalThe smart phone displays an angle of 84.4 degrees on a display screen of the smart phone, namely, the smart sound box is in the direction of 84.4 degrees of the smart phone.
In addition, the embodiment of the invention also provides a method for determining the contactor. Preferably, the embodiment of determining the contactor may be optimized in combination with the above-described relative angle determination method based on fig. 1.
FIG. 11 is a flow chart of a method for determining a contactor according to the present invention. The method is applicable to the first intelligent device, as shown in fig. 11, and comprises the following steps:
step 1101: the first smart device receives an ultrasonic signal from the second smart device containing an identification of the second smart device.
Here, the second smart device periodically transmits (e.g., via a microphone or microphone array built into the second smart device) an ultrasonic signal that contains an identification of the second smart device. When the distance between the first smart device and the second smart device falls within a detection range (e.g., 50 meters) of the ultrasonic signal, the first smart device may receive (e.g., through a microphone or microphone array built into the first smart device) an ultrasonic signal from the second smart device that contains an identification of the second smart device. When the distance between the first smart device and the second smart device exceeds the detection range of the ultrasonic signal (e.g., 50 meters), the first smart device is unable to receive the ultrasonic signal from the second smart device. The first intelligent device and the second intelligent device are mobile devices.
Step 1102: the first intelligent device analyzes the identification of the second intelligent device from the ultrasonic signal.
Here, the first smart device parses the identification of the second smart device from the received ultrasound signal and saves the identification. Wherein the identification of the second smart device comprises a Media Access Control (MAC) address, an International Mobile Subscriber Identity (IMSI) or an International Mobile Equipment Identity (IMEI) of the second smart device, and so on. Moreover, the identification of the second smart device may also be implemented as an instant messaging number, email address, etc. of the user of the second smart device.
Step 1103: when a predetermined reporting condition is met, the first intelligent device sends reporting information containing the identification of the second intelligent device to the server, wherein the server determines the user corresponding to the identification of the second intelligent device as a contact of the user of the first intelligent device.
The reporting condition may include: (1) When the user of the first smart device is determined to be a particular person who needs to be investigated for the contact (e.g., the user of the first smart device is identified as an infectious agent of an infectious disease); (2) when a predetermined reporting time expires; (3) Determining that a user of the first intelligent device has arrived at the epidemic area when the user of the first intelligent device is determined to arrive at the epidemic area based on the geographic information of the first intelligent device; (4) other preset reporting conditions; etc.
After receiving the report information, the server determines a user corresponding to the identity of the second smart device (e.g., a user holding the second smart device) as a contact of the user of the first smart device. Then, after determining that the user of the first smart device is infectious, the server sends alarm information (e.g., a short message) to the second smart device based on the identification of the second smart device to inform the user of the second smart device to perform corresponding test and self-isolation, and continuously records geographical information of the second smart device.
In one embodiment, the second intelligent device continuously transmits the ultrasonic signal according to a preset period, and the first intelligent device records each receiving time of the ultrasonic signal in each round period and further comprises each receiving time in the reported information; the server determines the continuous contact time of the user of the first intelligent device and the user of the second intelligent device based on each receiving moment, and determines the user of the second intelligent device as an important contact person when the continuous contact time is larger than a preset threshold value.
Fig. 12 is a schematic diagram of the invention for determining duration. Fig. 12 is a summary of the report information (including each time of reception) provided by the first smart device by the server, where the horizontal axis is the number of the second smart device and the vertical axis is the period number. The checkmark (∈) indicates that an ultrasonic signal was received, and the cross (X) indicates that an ultrasonic signal was not received. Assume that the predetermined threshold value for the duration of contact is 10 minutes and each period is 1 minute.
Based on fig. 12, the server can find that the duration of contact between the first smart device and the second smart device with the number 1 is at least 10 minutes, for example, in the period 1-10, the first smart device continuously detects the ultrasonic signal sent by the second smart device with the number 1, so that the server recognizes that the user of the second smart device with the number 1 is a key contact person of the user of the first smart device, and there is a greater risk of infection.
The embodiment of determining the contactor may be further optimized in connection with the relative angle determination method described in fig. 1. Wherein: the fact that the first intelligent device user and the second intelligent device user are in face-to-face contact is considered to have a large infection risk; the first smart device user has a lower risk of infection when in back-to-back contact with the second smart device user.
In one embodiment, a first smart device includes a first sound detection module and a second sound detection module; the second intelligent device sends the ultrasonic signal according to a preset period; the method further comprises the steps of: determining a time difference between a time of receipt of a first ultrasonic signal directly to the first sound detection module and a time of receipt of a second ultrasonic signal directly to the second sound detection module The method comprises the steps of carrying out a first treatment on the surface of the Determining a relative angle between the first smart device and the second smart device based on a distance between the first sound detection module and the second sound detection module and the time difference; wherein the first ultrasonic signal and the second ultrasonic signal are contained in ultrasonic signals transmitted by the second smart device at the same point in time; the reported information further comprises a relative angle; wherein the user of the second smart device is determined to be the accent contactor when the server determines that the relative angle is within the predetermined angle range. For example, the angular range may be [ -5 degrees, +5 degrees]. The first sound detection module and the second sound detection module have a fixed distance. The first sound detection module and the second sound detection module may be implemented as microphones or microphone arrays, respectively. The manner in which the first smart device calculates the relative angle may be referred to as shown in fig. 1The determination method is not repeated for the specific calculation process. Specifically, first based on +.>Determining theta; wherein arcsin is an arcsin function, d=t×c, t is the time difference, c is the propagation speed of sound, and D is the distance between the first sound detection module and the second sound detection module; then determining the relative angle between the first intelligent device and the second intelligent function device based on theta >Wherein->
In one embodiment, the first smart device further determines a distance between the first smart device and the second smart device and carries the distance in the reported information to be sent to the server, whereby the server determines the intimate contact based on three factors together, distance, relative angle, and duration of contact. At this time, when the server determines that the continuous contact time is greater than the predetermined continuous time threshold value, the distance is greater than the predetermined distance threshold value, and the relative angle is within the predetermined angle range, the user of the second smart device is determined as the key contact of the user of the first smart device. Here, the first smart device may determine the distance to the second smart device based on a variety of ways. Such as based on acoustic localization (preferably ultrasound localization), etc.
Example 1: the first intelligent device and the second intelligent device keep time synchronization, the first ultrasonic signal further comprises a sending time T1 of the first ultrasonic signal, and the first intelligent device determines the distance between the first intelligent device and the second intelligent device comprises: a calculator in the first intelligent device calculates a distance L between the first intelligent device and the second intelligent device; wherein l= (T2-T1) ×c; c is the propagation speed of ultrasound in air; t2 is the time of reception of the first ultrasonic signal.
Example 2: the first intelligent device and the second intelligent device keep time synchronization, the second ultrasonic signal further comprises a sending time T3 of the second ultrasonic signal, and the first intelligent device determines the distance between the first intelligent device and the second intelligent device comprises: a calculator in the first intelligent device calculates a distance L between the first intelligent device and the second intelligent device; wherein l= (T4-T3) xc; c is the propagation speed of ultrasound in air; t4 is the time of reception of the second ultrasonic signal.
Example 3: and determining the distance between the first intelligent device and the second intelligent device at the rotation stopping point based on the rotation angle of the first intelligent device and the relative angle between the first intelligent device and the second intelligent device at the rotation stopping point. Specifically, when the first smart device is moved from the first location point T with the fixed point a as the center 1 Rotated to the second position point T 2 Determining the rotation angle of the first intelligent device; wherein the first intelligent device rotates to a second position point T 2 When, based on the first sound detection module and the second sound detection module arranged on the first smart device, the relative angle between the first smart device and the second smart device determined for the reception time difference of the direct ultrasonic signal transmitted by the second smart device arranged at the position point B has changed to zero, or The relative angle goes through a process of changing to an angle alpha after changing to zero, wherein alpha is not more than 180 degrees; and determining the distance between the first intelligent device and the second intelligent device based on the relative angle and the rotation angle. For example, at the second position point T 2 The relative angle is zero; based on the relative angle and the rotation angle, determining the distance between the first smart device and the second smart device includes: based onDetermining when the first smart device is at the first location point T 1 When the distance R between the first intelligent device and the second intelligent device is equal to 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein R is 2 Is the distance between the fixed point A and the first intelligent device; />For the first intelligent device at the first position point T 1 When the intelligent device is in a first state, the relative angle between the first intelligent device and the second intelligent device is smaller than the relative angle between the first intelligent device and the second intelligent device; psi phi type 1 To rotate the angle phi 1 Is angle T 1 AB. For another example: at the second position point T 2 The relative angle is alpha; based on the relative angle and the rotation angle, determining a distance between the first smart device and the second smart device includes: based on->Determining when the first smart device is at the second location point T 2 When in use, the distance R between the first intelligent device and the second intelligent device 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein R is 2 Is the distance between the fixed point A and the first intelligent device; / >For the first intelligent device at the second position point T 2 When the intelligent device is in a first state, the relative angle between the first intelligent device and the second intelligent device is smaller than the relative angle between the first intelligent device and the second intelligent device; psi phi type 1 For the rotation angle, ψ 1 Is +.T 2 AB。
Example 4: the first smart device non-rotatably moves from the first location point to the second location point based on a relative angle sum between the first smart device and the second smart device at the first location pointAnd determining the distance between the first intelligent device and the second intelligent device at the second position point by the relative angle between the first intelligent device and the second intelligent device at the second position point, wherein the direction of the first intelligent device at the second position point is the same as the direction of the first intelligent device at the first position point. Specifically, when the first intelligent device is at the first position point, determining a relative angle 1 between the first intelligent device and the second intelligent device based on a receiving time difference of a direct ultrasonic signal sent by the second intelligent device by a first sound detection module and a second sound detection module which are arranged on the first intelligent device; when the first intelligent device moves to a second position point, determining a relative angle 2 between the first intelligent device and the second intelligent device based on a receiving time difference of the direct ultrasonic signal sent by the first sound detection module and the second sound detection module for the second intelligent device; wherein the first smart device at the second location point is in the same direction as the second smart device at the first location point; based on the relative angle 1 and the relative angle 2, a relative position of the first smart device and the second smart device is determined. Preferably, the relative angle 1 is phi 1 Relative angle 2 is phi 2 The method comprises the steps of carrying out a first treatment on the surface of the Based on the relative angle 1 and the relative angle 2, determining the distance of the first smart device from the second smart device includes: determination of R 2 WhereinWherein R is 2 Is the distance between the second location point and the second intelligent device; c is the propagation speed of sound; the Δt is a difference between a detection time in a detection time window of the first sound detection module for the ultrasonic signal of the direct first sound detection module and a detection time in a detection time window of the first sound detection module for the ultrasonic signal of the direct first sound detection module at the second position point, or a difference between a detection time in a detection time window of the second sound detection module for the ultrasonic signal of the direct second sound detection module and a detection time in a detection time window of the second sound detection module for the ultrasonic signal of the direct second sound detection module at the first position point.
While the foregoing exemplary description of exemplary embodiments of the first smart device calculating the distance to the second smart device is provided by way of example only, and is not intended to limit the scope of embodiments of the present invention, as smart devices may also determine the distance to the second smart device by way of infrared ranging, bluetooth ranging, non-time synchronized ultrasonic ranging, etc.
Preferably, the first smart device and the second smart device may each include: a smart phone; a tablet computer; a smart watch; an intelligent bracelet; smart headphones, and the like.
Fig. 13 is a system configuration diagram of the invention for determining a contactor. In this system:
the first smart device includes: a receiving module for receiving an ultrasonic signal from the second smart device containing an identification of the second smart device; the analysis module is used for analyzing the identification of the second intelligent device from the ultrasonic signal; and the reporting module is used for sending reporting information containing the identification of the second intelligent device to the server when a preset reporting condition is met, wherein the server determines the user corresponding to the identification of the second intelligent device as a contact of the user of the first intelligent device.
Preferably, the second smart device transmits the ultrasonic signal according to a predetermined period; the reporting module is used for recording each receiving time of the ultrasonic signal and further comprises each receiving time in the reporting information; the server determines the continuous contact time of the user of the first intelligent device and the user of the second intelligent device based on each receiving moment, and determines the user of the second intelligent device as an important contactor when the continuous contact time is larger than a preset threshold value.
The receiving module may include a first sound detection module and a second sound detection module. The reporting module is further used for determining the time difference between the receiving time of the first ultrasonic signal directly reaching the first sound detection module and the receiving time of the second ultrasonic signal directly reaching the second sound detection module; determining a relative angle between the first smart device and the second smart device based on a distance and a time difference between the first sound detection module and the second sound detection module; wherein the first ultrasonic signal and the second ultrasonic signal are contained in ultrasonic signals transmitted by the second smart device at the same point in time; the reported information further comprises a relative angle; wherein the user of the second smart device is determined to be the focused contactor of the user of the first smart device when the server determines that the relative angle is within the predetermined angle range.
Specifically, the server includes: the receiving module is used for receiving reporting information from the first intelligent equipment, wherein the reporting information comprises the identification of the second intelligent equipment; the first intelligent device receives an ultrasonic signal containing the identification of the second intelligent device from the second intelligent device, analyzes the identification of the second intelligent device from the ultrasonic signal, and sends reporting information to the server when a preset reporting condition is met; a determination module for determining a user corresponding to the identity of the second smart device as a contact of the user of the first smart device.
Examples: suppose that in the train station waiting hall, zhang three and Liu four, and Wang five are strangers, zhang three and Liu four are kept in close contact for 10 minutes, and Zhang three and Wang Wubao are kept in close contact for 1 minute. Let Zhang three, li four, wang five use smartphones, all available for transmitting, for receiving and resolving ultrasound signals.
The first step: the smart phones of the Li IV and Wang V transmit signals in ultrasonic format, wherein the signals comprise unique identifiers (Mac address/ID/anonymous identifiers generated and distributed by a third-party server and the like) of the respective smart phones, and the ultrasonic signals can be signals based on a CDMA (code division multiple Access) technical architecture. And a second step of: the third smart phone detects the ultrasonic signal and resolves the identifier from the detected ultrasonic signal. And a third step of: the third smart phone records the identifiers of the received four and five smart phones. Fourth step: seven days later, zhang San unfortunately diagnosed as a pneumonia patient infected with SARS-CoV-2 novel coronavirus, zhang San uploaded all identifiers stored in its 14 days to a server, where it was decrypted and then explicitly informed of the contactor. Further, the server determines the matching according to the time spent between the two devices not less than 10 minutes, namely, the smart phone of Zhang three always receives and analyzes the identifiers of the mobile terminals of other users for more than 10 minutes. Fifth step: the screened strangers in close contact with the skin are fourth, and have high infection possibility and further transmission risk. The server informs the four diagnostic persons who have been close to the positive detection result, and further executes corresponding test and self-isolation.
It can be seen that the method based on voice recognition between two intelligent devices by using the ultrasonic technology of the smart phone does not need to lay extra hardware, realizes the contact tracking based on the relative position, helps people to determine whether the people have contacted the novel coronavirus pneumonitis patient by identifying and tracking the people who have contacted the SARS-CoV-2 patient, helps public health authorities to track the transmission path of the disease, and informs possible indirect contact people so that they can be detected. Wherein each user's smartphone can both transmit and receive ultrasound signals, but only record the heard ultrasound signals.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements each process implemented in the above embodiments of the invention, and can achieve the same technical effects, so that repetition is avoided, and no further description is provided herein.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (5)
1. A method of determining a contactor, the method being adapted for use with a first smart device, the method comprising:
receiving an ultrasonic signal from the second smart device containing an identification of the second smart device;
analyzing the identification of the second intelligent device from the ultrasonic signal;
when a predetermined reporting condition is met, sending reporting information containing the identification of the second intelligent device to a server, wherein the server determines a user corresponding to the identification of the second intelligent device as a contact of the user of the first intelligent device;
the first intelligent device comprises a first sound detection module and a second sound detection module; the second intelligent device sends the ultrasonic signal according to a preset period; the method comprises the following steps:
determining a time difference between a time of receipt of a first ultrasonic signal directly reaching the first sound detection module and a time of receipt of a second ultrasonic signal directly reaching the second sound detection module; determining a relative angle between the first smart device and the second smart device based on a distance between the first sound detection module and the second sound detection module and the time difference; wherein the first ultrasonic signal and the second ultrasonic signal are contained in ultrasonic signals transmitted by a second smart device at the same point in time; wherein the relative angle is further included in the reported information;
The first intelligent device further determines the distance between the first intelligent device and the second intelligent device, and carries the distance in the reported information to be sent to the server, so that the server jointly determines the key contactor based on three factors of the distance, the relative angle and the continuous contact time;
wherein when the server determines that the duration of contact is greater than the predetermined duration threshold, the distance is greater than the predetermined distance threshold, and the relative angle is within the predetermined angular range, determining the user of the second smart device as the focused contactor of the user of the first smart device; the second intelligent device sends the ultrasonic signal according to a preset period, and the first intelligent device records each receiving time of the ultrasonic signal and further comprises each receiving time in the reported information; wherein the server determines a duration of contact of the user of the first smart device with the user of the second smart device based on the each time instant of receipt.
2. The method of claim 1, wherein the identification of the second smart device comprises a media access control address, an international mobile subscriber identity, or an international mobile equipment identity of the second smart device.
3. An apparatus for determining a contactor, the apparatus being adapted for use with a first smart device, the apparatus comprising:
a receiving module for receiving an ultrasonic signal from the second smart device containing an identification of the second smart device;
the analysis module is used for analyzing the identification of the second intelligent device from the ultrasonic signal;
the reporting module is used for sending reporting information containing the identifier of the second intelligent device to a server when a preset reporting condition is met, wherein the server determines a user corresponding to the identifier of the second intelligent device as a contact of the user of the first intelligent device;
the receiving module comprises a first sound detection module and a second sound detection module; the second intelligent device sends the ultrasonic signal according to a preset period;
the reporting module is further used for determining the time difference between the receiving time of the first ultrasonic signal reaching the first sound detection module and the receiving time of the second ultrasonic signal reaching the second sound detection module; determining a relative angle between the first smart device and the second smart device based on a distance between the first sound detection module and the second sound detection module and the time difference; wherein the first ultrasonic signal and the second ultrasonic signal are contained in ultrasonic signals transmitted by a second smart device at the same point in time; wherein the relative angle is further included in the reported information;
The first intelligent device further determines the distance between the first intelligent device and the second intelligent device, and carries the distance in the reported information to be sent to the server, so that the server jointly determines the key contactor based on three factors of the distance, the relative angle and the continuous contact time;
wherein when the server determines that the duration of contact is greater than the predetermined duration threshold, the distance is greater than the predetermined distance threshold, and the relative angle is within the predetermined angular range, determining the user of the second smart device as the focused contactor of the user of the first smart device; the second intelligent device sends the ultrasonic signal according to a preset period, and the first intelligent device records each receiving time of the ultrasonic signal and further comprises each receiving time in the reported information; wherein the server determines a duration of contact of the user of the first smart device with the user of the second smart device based on the each time instant of receipt.
4. The apparatus of claim 3, wherein the identification of the second smart device comprises a media access control address, an international mobile subscriber identity, or an international mobile equipment identity of the second smart device.
5. A computer readable storage medium having stored therein computer readable instructions for performing the method of determining a contactor according to any of claims 1-2.
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