CN115550828A - Construction method suitable for TWS Bluetooth headset adaptation test system - Google Patents
Construction method suitable for TWS Bluetooth headset adaptation test system Download PDFInfo
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- CN115550828A CN115550828A CN202211489465.9A CN202211489465A CN115550828A CN 115550828 A CN115550828 A CN 115550828A CN 202211489465 A CN202211489465 A CN 202211489465A CN 115550828 A CN115550828 A CN 115550828A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive loop type
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- H04B5/73—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to the field of Bluetooth communication testing, in particular to a method for constructing a testing system. The invention is realized by the following technical scheme: a construction method suitable for a TWS Bluetooth headset adaptation test system comprises the following steps: s01, selecting an antenna; s02, an antenna mounting step; s03, calculating a phase difference; s04, calculating an optimal propagation distance; and S05, determining the center of the test area. The invention aims to provide a construction method suitable for a TWS Bluetooth headset adaptation test system, which limits the signal transmission direction of the Bluetooth test system, locks a certain area as an effective test area, and avoids the communication disorder caused by the communication with other peripheral Bluetooth headsets, wherein a Bluetooth adapter can only communicate with the Bluetooth headset in the area; in the whole process, auxiliary components such as an RF shielding box are not needed, the cost is controlled, and the testing efficiency is improved.
Description
Technical Field
The invention relates to the field of Bluetooth communication test, in particular to a construction method of a test system.
Background
Bluetooth is an open global specification for wireless data and voice communications, and is a special short-range wireless technology connection that establishes a communication environment for fixed and mobile devices based on a low-cost short-range wireless connection.
Compared with other communication technologies, the bluetooth technology has the following advantages: the power consumption of bluetooth is very low, can guarantee that battery operated equipment works. In addition, the Bluetooth communication module is low in price, and is very friendly to low-cost equipment in terms of cost. Moreover, the Bluetooth technology can simultaneously manage data and sound transmission, has lower time delay, and has good effect when being used on some equipment needing a large amount of data transmission. The above advantages of bluetooth technology have led to a great deal of development and commercial use of bluetooth equipment in recent years, such as bluetooth headsets, bluetooth keyboards and mice, bluetooth car-mounted smart devices, etc.
The TWS Bluetooth headset is a key product. The TWS Bluetooth headset test mainly comprises a laboratory test part and a production line test part, wherein the laboratory test part and the production line test part are mainly used for quality test in a research and development stage and various certifications such as radio frequency, acoustics, safety and the like; the latter is mainly used for quality control in the production stage, and testing is carried out in advance in each stage, so that the reject ratio of finished products is reduced. The TWS earphone needs to be tested in a large amount in the production line production stage, the factors contained in the TWS earphone have many aspects, and the main purpose is to discriminate defective products so as to strictly control the quality of the products which leave a factory. The TWS bluetooth headset is used as a Sink terminal and needs to be connected with a bluetooth adapter (Source terminal) in a wireless radio frequency manner.
In this test procedure, the tester operates a bluetooth adapter that tests the transmitted bluetooth headsets one by one. In the prior art, there are two cases here, case one: each earphone has its own electronic code, and the adapter scans the surrounding environment, finds the electronic code to be assigned in the earphones, and then performs communication test with the earphones. However, in this case, the adapter and the headset need to support the read-write and storage functions of the electronic code, and the test system also needs to have management software of the search logic, which cannot be realized when the software and the hardware are not supported. Case two: the bluetooth test device disclosed in chinese patent publication No. CN202210221182 includes a bluetooth test board, a bluetooth comprehensive tester and a shielding box. In the test scheme, the core component is the shielding box, and compared with the first situation, the technical scheme does not need an adapter and an earphone to support the read-write function of the electronic code, and does not need the management software with the function of the test system. But need use the shielded cell, the test workman uses a bluetooth adapter and conveys the bluetooth device of coming and tests in turn, puts into the shielded cell with bluetooth adapter and bluetooth device during the test, takes out after the test. However, in such a solution, firstly, an expensive RF shielding box must be used for radio frequency isolation, and the test station forms a separate microwave dark room in the RF shielding box, and RF signals of other stations do not interfere with the current test station. This adds to the technical cost of the enterprise, as well as the need for a large number of expensive RF shielded boxes for multiple runs. On the other hand, the manual working strength is increased by frequent moving-in and moving-out operations of the shielding box, the operation is inconvenient, and the testing efficiency is greatly influenced.
Disclosure of Invention
The invention aims to provide a construction method suitable for a TWS Bluetooth headset adaptation test system, which is used for limiting the signal transmission direction of the Bluetooth test system, locking a certain area as an effective test area, and avoiding communication disorder with other peripheral Bluetooth headsets due to the fact that a Bluetooth adapter can only communicate with the Bluetooth headset in the area; in the whole process, auxiliary parts such as an RF shielding box are not needed, the cost is controlled, and the testing efficiency is improved.
The invention is realized by the following technical scheme: a construction method suitable for a TWS Bluetooth headset adaptation test system is characterized by comprising the following steps: s01, selecting an antenna; determining the type and the number of antennas, wherein the number of the antennas is more than or equal to 3; s02, an antenna mounting step; mounting the antennas determined in the S01 on a Bluetooth adapter, wherein the distance between adjacent antennas is not more than half of the wavelength value of a Bluetooth communication signal; s03, calculating a phase difference; calculating a phase value P of each antenna, wherein the phase value P1 of the first antenna is preset, and the phase value P of each antenna is obtained according to the following formula:
Preferably, in the step S01, the number of antennas is 3 to 12.
Preferably, in the step S02, the plurality of antennas are arranged in a spiral shape, a matrix shape or a linear shape.
Preferably, in the step S02, the plurality of antennas are arranged in a linear manner and are uniformly spaced.
Preferably, adjacent antennas are spaced apart by a quarter of the wavelength of the bluetooth communication signal.
Preferably, in the step S03, the forgetting factor α ranges from 1 to 2.
Preferably, in the step S03, an RLS algorithm is used.
In summary, the invention has the following beneficial effects:
1. according to the Bluetooth adaptation test system built by the method, the effective test area can be limited to a specific area, namely, the Bluetooth adapter can only normally communicate with the TWS Bluetooth headset placed in the area, and an RF shielding box is not needed.
2. The array antenna technology is adopted, and the phase value of each antenna array element is adjusted to achieve optimal receiving and transmitting, so that a plurality of signals received and transmitted on the same channel are not interfered mutually. The multi-path interference, the co-channel interference and the multi-access interference which are different from the received signal direction are effectively inhibited, and the transmission quality of the signals and the directivity of signal conduction are improved.
3. The whole step S03 adopts the RLS algorithm. The convergence rate of the RLS algorithm is slower than that of the DMI algorithm, but the RLS algorithm has great speed improvement compared with the LMS algorithm, and the performance of the RLS algorithm is close to that of the DMI algorithm, so that the RLS algorithm has the advantages of the LMS algorithm and the DMI algorithm.
Drawings
FIG. 1 is a schematic view of example 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Embodiment 1, a bluetooth adaptation test system constructed according to the method can limit an effective test area to a specific area, that is, a bluetooth adapter can only normally communicate with a TWS bluetooth headset placed in the specific area, and an RF shielded box is not required.
And S01, selecting an antenna.
In this step, the type and number of antennas are determined.
The antenna can directly select and use mature products in the prior art, according to the actual effect, the number of the antenna is more and better, but from the marginal effect comprehensive consideration of cost control and actual effect promotion, the number of the general antenna is 3-12, and in this embodiment, the number of the antenna is 8.
S02, an antenna mounting step.
These antennas are mounted to the bluetooth adapter and arranged in a specified manner. The general arrangement may be helical, matrix and linear. In this embodiment, a linear array is adopted, that is, 8 antennas are linearly arranged at uniform intervals.
The spacing between adjacent antennas is the same, and in this embodiment, the spacing is defined as a quarter wavelength. The wavelength here refers to the wavelength of the bluetooth communication signal. Typically, the spacing is no greater than one-half wavelength.
And S03, calculating a phase difference.
As shown in fig. 1, 8 antennas are arranged in a vertical direction, and if the 8 antennas have no phase difference, that is, if the 8 antennas transmit some data synchronously, the direction of data propagation is difficult to control. In the present case, used the technical scheme of transmission directive property radio frequency signal, through the phase place of modulating every antenna output signal for signal transmission angle is accurate adjustable.
The specific phase control formula is as follows:
in this formula, P is the output signal phase of each antenna in the iterative process, and n is the number of antennas. If the number of antennas is 8 in this embodiment, n is 1, 2, 3, 4, 5, 6, 7.P (n) and P (n + 1) are the phases of the output signals of two adjacent antennas. In fig. 1, the phase value of each antenna from top to bottom can be regarded as P1, P2, P3 \8230; P8. In the formula, α is a forgetting factor, which is generally equal to or less than 10, and preferably may be set to be between 1 and 2, and in this embodiment, α may be set to be 1.5. X is a reference signal value and is determined by a chip when radio frequency occurs, X is directly measured without calculation, can be regarded as a constant in the formula calculation process, and T is a transpose operator. Based on this, P1 is a value of the first antenna, and there is no concept of "phase difference from the previous antenna", so P1 may be designated by the user as a value, and then, P2 to P8 may be sequentially calculated based on the previous value.
The phase determines the propagation angle of the signal, i.e. the propagation angle of the signal under the control of the phase can be obtained by the specific values calculated by the users from P1 to P8. When the user controls 8 sensors to propagate the phase value calculated according to the present step, the signal will be as shown in fig. 1
The angular direction of propagation.
The whole step S03 adopts the RLS algorithm. The main difference between the RLS algorithm and the DMI algorithm is that the method for calculating the inverse matrix is different, and the RLS algorithm does not need to directly perform matrix inversion operation, so that the defect of large operation amount of the DMI algorithm can be overcome to a certain extent. The convergence rate of the RLS algorithm is slower than that of the DMI algorithm, but the RLS algorithm has great speed improvement compared with the LMS algorithm, and the performance of the RLS algorithm is close to that of the DMI algorithm, so that the RLS algorithm has the advantages of the LMS algorithm and the DMI algorithm.
And S04, calculating the optimal propagation distance.
In the present case, the optimal propagation distance is considered as the higher the main lobe value is, the better, and the smaller the side lobe data is, the better. Based on this, the formula used in this step is:
wherein, the Radiation Intensity is the main lobe value, and the Radiation Intensity Of Isotropic Antenna (all angles) is the side lobe value. And the leftmost GT in the formula is the line gain, which is the required result of this step. The rightmost N in the formula is the number of the antennas and is determined in S01, the rightmost Ge in the formula is the element gain, the numerical value is determined by the materials of the antennas and is also determined in S01, so in the calculation process of the step, N and Ge are both known quantities, and Gt can be obtained.
And S05, determining the center of the test area.
In this step, the final test area center is determined. The center of the test area is established in relation to two parameters, the phase value of each antenna and the line gain value of the whole antenna group. The former is obtained in step S03 and the latter is already obtained in step S04. The former determines the optimal propagation distance D, i.e. the distance from the center of the test area to the center of the antenna array, and the latter determines the correction angle
. It should be noted that the correction angle is obtained from the signal phase value P
The calculation method of (b) is the prior art, and is not described herein again.
Correcting angle
As shown in fig. 1, that is, the angle between the original transmitting direction of the antenna signal and the transmission direction of the effective signal after phase adjustment is obtained.
According to D and
the center of a test area can be obtained, and the Bluetooth is adapted as long as the earphone to be tested is placed at the center of the test areaThe device can communicate with the Bluetooth headset and can be tested. And other earphones to be tested only need to be placed far away from the center of the test area, and the earphones cannot communicate with the Bluetooth adapter.
In conclusion, the TWS Bluetooth headset adaptation test system constructed by the method effectively reduces the cost input of test hardware, improves the test efficiency, does not have frequent switch boxes, and solves the problem that the current test needs to use an RF shielding box.
Claims (7)
1. A construction method suitable for a TWS Bluetooth headset adaptation test system is characterized by comprising the following steps: s01, selecting an antenna; determining the types and the number of antennas, wherein the number of antennas is more than or equal to 3; s02, an antenna mounting step; mounting the antennas determined in the S01 on a Bluetooth adapter, wherein the distance between adjacent antennas is not more than half of the wavelength value of the Bluetooth communication signal; s03, calculating a phase difference; calculating a phase value P of each antenna, wherein the phase value P1 of the first antenna is preset, and the phase value P of each antenna is obtained according to the following formula:
alpha is a forgetting factor, a numerical value is assigned by a user, alpha is less than or equal to 10, X is a reference signal value, the alpha is determined by a chip when radio frequency occurs and is measured, and T is a transpose operator; the correction angle can be directly obtained according to the phase value P of each signal
(ii) a S04, calculating an optimal propagation distance; the optimal propagation distance D is the line gain Gt, which is =
N and Ge are both known quantities, N is the number of antennas, and Ge is the element gain value determined by the antenna material;
s05, determining the center of a test area; based on the corrected angle
And the optimal propagation distance D to obtain the center of the test area; and the user places the earphone to be tested at the center of the test area.
2. The construction method of the TWS Bluetooth headset adaptation test system according to claim 1, wherein: in the step S01, the number of antennas is 3 to 12.
3. The construction method of the TWS Bluetooth headset adaptation test system according to claim 1, wherein: in the step S02, the plurality of antennas are arranged in a spiral shape, a matrix shape, or a linear shape.
4. The construction method of the TWS Bluetooth headset adaptation test system according to claim 3, wherein: in the step S02, the plurality of antennas are arranged in a linear manner and are uniformly spaced.
5. The method of claim 4, wherein the method comprises the following steps: the spacing between adjacent antennas is one quarter of the wavelength of the bluetooth communication signal.
6. The method of claim 1, wherein the method comprises the following steps: in the step S03, the forgetting factor α ranges from 1 to 2.
7. The construction method of the TWS Bluetooth headset adaptation test system according to claim 1, wherein: in the S03 step, an RLS algorithm is used.
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