Test device and test apparatus
By designing a test device that includes audio signal pickup, amplification, and playback modules, the problems of expensive hearing aids and high training costs are solved, enabling low-cost and rapid T-Coil coil testing.
Patent Information
- Application Number
- CN202522056016.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-24
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-09-24
AI Technical Summary
Professional hearing aids used for testing mobile phone T-coil coils are expensive, and the testing operation requires professional training, which increases the testing cost.
Design a testing device including an audio signal pickup module, an amplification module, and a playback module. The device receives radio frequency signals emitted by a T-Coil coil, converts them into electrical signals, amplifies them, and finally converts them into perceptible signals for testing the function of the T-Coil coil.
This reduces testing costs, eliminates the need for professional training, and allows testers to quickly determine whether the T-Coil coil is functioning properly by directly sensing the signal.
Smart Images
Figure CN224684363U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of equipment testing technology, and in particular to a testing device and testing equipment. Background Technology
[0002] Mobile communication devices, such as mobile phones, have become indispensable tools in modern society. To ensure that hearing-impaired individuals can also use communication services equally, regulatory agencies in various countries mandate that mobile phones must have hearing-aid compatibility (HAC) functionality. HAC functionality includes radio frequency interference immunity and a T-coil (Telecoil) mode. The principle of T-coil mode is as follows: a T-coil coil inside the mobile phone converts audio signals into radio frequency signals. The T-coil coil inside the hearing aid receives the radio frequency signals and converts them back into audio signals, allowing hearing-impaired individuals to hear sounds from the mobile phone through their hearing aids. Before leaving the factory, the T-coil coil in the mobile phone needs to be tested to ensure that it can function correctly in T-coil mode.
[0003] Since the signal emitted by the T-coil coil in a mobile phone is a radio frequency signal, it cannot be directly perceived. Therefore, in related technologies, testers usually need to use professional hearing aids to perform T-coil tests.
[0004] However, professional hearing aids are expensive to manufacture, and testing requires professional training, which increases testing costs. Utility Model Content
[0005] This application provides a testing device and equipment to address the problem that professional hearing aids are expensive to manufacture and that testing operations require professional training, which increases testing costs, thereby achieving the goal of reducing testing costs.
[0006] In a first aspect, this application provides a testing device, including: an audio signal pickup module, an amplification module, and a playback module; The audio signal pickup module, the amplification module, and the playback module are connected in sequence; The audio signal pickup module is used to receive the radio frequency signal emitted by the T-Coil coil in the device under test, convert the radio frequency signal into an electrical signal, and input the electrical signal to the amplification module; wherein, the radio frequency signal carries the audio information emitted by the device under test; The amplification module is used to amplify the electrical signal to obtain an amplified signal, and input the amplified signal to the playback module; The playback module is used to convert the amplified signal into a perceptible signal; wherein the perceptible signal carries audio information emitted by the device under test.
[0007] In one possible design, the audio signal pickup module includes: at least one test coil; The first end of the test coil is electrically connected to the first input terminal of the amplification module, and the second end of the test coil is electrically connected to the second input terminal of the amplification module. The test coil is used to receive the radio frequency signal, convert the radio frequency signal into a first electrical signal and a second electrical signal through electromagnetic coupling, and input the first electrical signal to the first input terminal of the amplification module and the second electrical signal to the second input terminal of the amplification module.
[0008] In one possible design, the audio signal pickup module further includes: at least one twisted pair cable; The first input terminal of the twisted pair is electrically connected to the first terminal of the test coil, the second input terminal of the twisted pair is electrically connected to the second terminal of the test coil, the first output terminal of the twisted pair is electrically connected to the first input terminal of the amplification module, and the second output terminal of the twisted pair is electrically connected to the second input terminal of the amplification module. The twisted pair is used to suppress common-mode noise during the transmission of the first electrical signal and the second electrical signal.
[0009] In one possible design, the amplification module includes: at least one power amplifier; The inverting input terminal of the power amplifier is electrically connected to the first terminal of the test coil, the non-inverting input terminal of the power amplifier is electrically connected to the second terminal of the test coil, and the output terminal of the power amplifier is electrically connected to the playback module. The power amplifier is used to differentially amplify the received first electrical signal and the second electrical signal to obtain an amplified signal, and input the amplified signal to the playback module.
[0010] In one possible design, the audio signal pickup module includes: a first test coil and a second test coil; the amplification module includes: a first power amplifier and a second power amplifier; The first end of the first test coil is electrically connected to the inverting input terminal of the first power amplifier, and the second end of the first test coil is electrically connected to the non-inverting input terminal of the first power amplifier; the first end of the second test coil is electrically connected to the inverting input terminal of the second power amplifier, and the second end of the second test coil is electrically connected to the non-inverting input terminal of the second power amplifier. The first test coil is used to receive the first radio frequency signal emitted by the T-Coil coil in the first device under test, convert the first radio frequency signal into a third electrical signal and a fourth electrical signal through electromagnetic coupling, and input the third electrical signal to the inverting input terminal of the first power amplifier and the fourth electrical signal to the non-inverting input terminal of the first power amplifier. The second test coil is used to receive the second radio frequency signal emitted by the T-Coil coil in the second device under test, convert the second radio frequency signal into a fifth electrical signal and a sixth electrical signal through electromagnetic coupling, and input the fifth electrical signal to the inverting input terminal of the second power amplifier and the sixth electrical signal to the non-inverting input terminal of the second power amplifier.
[0011] In one possible design, the audio signal pickup module further includes: a first twisted pair cable and a second twisted pair cable; The first input terminal of the first twisted pair is electrically connected to the first terminal of the first test coil, the second input terminal of the first twisted pair is electrically connected to the second terminal of the first test coil, the first output terminal of the first twisted pair is electrically connected to the inverting input terminal of the first power amplifier, and the second output terminal of the first twisted pair is electrically connected to the non-inverting input terminal of the first power amplifier; the first input terminal of the second twisted pair is electrically connected to the first terminal of the second test coil, the second input terminal of the second twisted pair is electrically connected to the second terminal of the second test coil, the first output terminal of the second twisted pair is electrically connected to the inverting input terminal of the second power amplifier, and the second output terminal of the second twisted pair is electrically connected to the non-inverting input terminal of the second power amplifier. The first twisted pair is used to suppress common-mode noise during the transmission of the third electrical signal and the fourth electrical signal; The second twisted pair is used to suppress common-mode noise during the transmission of the fifth and sixth electrical signals.
[0012] In one possible design, the audio signal pickup module includes: a first test coil; the amplification module includes: a first power amplifier and a second power amplifier; and the playback module includes headphones. The first end of the first test coil is electrically connected to the inverting input terminal of the first power amplifier and the inverting input terminal of the second power amplifier, respectively; the second end of the first test coil is electrically connected to the non-inverting input terminal of the first power amplifier and the non-inverting input terminal of the second power amplifier, respectively. The first test coil is used to receive the first radio frequency signal emitted by the T-Coil coil in the first device under test, convert the first radio frequency signal into a third electrical signal and a fourth electrical signal through electromagnetic coupling, and input the third electrical signal to the inverting input terminal of the first power amplifier and the inverting input terminal of the second power amplifier, and input the fourth electrical signal to the non-inverting input terminal of the first power amplifier and the non-inverting input terminal of the second power amplifier; The first power amplifier is used to differentially amplify the third electrical signal and the fourth electrical signal and then input them to the first channel of the headphones; the second power amplifier is used to differentially amplify the third electrical signal and the fourth electrical signal and then input them to the second channel of the headphones.
[0013] In one possible design, the playback module includes headphones; the perceptible signal is an audio signal. The earphone is used to convert the amplified signal into a sound signal, the sound signal carrying audio information emitted by the device under test.
[0014] In one possible design, the playback module includes an oscilloscope; the perceptible signal is a waveform image. The oscilloscope is used to convert the amplified signal into a waveform image, which carries audio information emitted by the device under test.
[0015] Using the testing apparatus provided in the first aspect, the audio signal pickup module receives the radio frequency (RF) signal emitted by the T-Coil coil in the device under test (DUT), converts the RF signal into an electrical signal, and inputs the electrical signal to the amplification module, thereby achieving RF signal capture and conversion. The amplification module amplifies the electrical signal to obtain an amplified signal, which is then input to the playback module to drive the subsequent playback module. The playback module converts the amplified signal into a perceptible signal, which carries the audio information emitted by the DUT. This perceptible signal can be used to test whether the T-Coil coil in the DUT is functioning properly. Therefore, compared to professional hearing aids, the audio signal pickup module, amplification module, and playback module have lower manufacturing costs, and there is no need to incur costs for professional training of testing personnel. Testing personnel can directly perceive the converted signal through their senses to detect the T-Coil coil in the DUT, thus reducing testing costs.
[0016] Secondly, this application provides a testing device, which includes: a fixture and a testing apparatus as described in the first aspect and any possible design of the first aspect.
[0017] The clamp is used to fix the device under test so that the T-Coil coil in the device under test is close to the audio signal pickup module in the test device.
[0018] The beneficial effects of the test equipment provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description
[0019] Figure 1 A schematic diagram of the structure of a testing device provided in an embodiment of this application. Figure 1 .
[0020] Figure 2 A schematic diagram of the structure of a testing device provided in an embodiment of this application. Figure 2 .
[0021] Figure 3 A schematic diagram of the structure of a testing device provided in an embodiment of this application. Figure 3 .
[0022] Figure 4 A schematic diagram of the structure of a testing device provided in an embodiment of this application. Figure 4 .
[0023] Figure 5 A schematic diagram of the structure of a testing device provided in an embodiment of this application. Figure 5 .
[0024] Explanation of reference numerals in the attached figures: 10 - Audio signal pickup module; 11 - First test coil; 12 - Second test coil; 13 - First twisted pair; 14 - Second twisted pair; 20 - Amplification module; 21-First power amplifier; 22-Second power amplifier; 30 - Playback Module; 31-Headphones. Detailed Implementation
[0025] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c alone can mean: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0026] The terms “center,” “longitudinal,” “lateral,” “up,” “down,” “left,” “right,” “front,” and “rear,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0027] The terms "connected" and "connected" should be interpreted broadly. For example, in circuit structures, "connected" or "connected" can refer not only to physical connections but also to electrical or signal connections. This could be a direct connection (physical connection) or an indirect connection via at least one intermediate component, as long as the circuit is connected. It could also refer to the internal connection between two components. Similarly, a signal connection can refer to a connection via a circuit or a medium, such as radio waves. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.
[0028] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the arc-extinguishing structure of this application. For example, in the description of this application, terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0029] In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" as described in this application does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims listing several means, several units of these means may be embodied by the same item of hardware. The use of "first," "second," and "third," etc., does not indicate any order and these words should be interpreted as names. Unless otherwise specified, the steps in the above embodiments should not be construed as limiting the order of execution.
[0030] For example, this application provides a testing device and testing equipment that captures the radio frequency signal emitted by the T-Coil coil in the device under test through an audio signal pickup module, converts the radio frequency signal into an electrical signal, and converts the amplified electrical signal into a perceptible signal such as sound or light that can be perceived by the human ear or an instrument, thereby eliminating the need for testing with a professional hearing aid and achieving fast and low-cost testing.
[0031] Below, in conjunction with Figure 1 This application provides a detailed description of the specific implementation of the testing device provided in its embodiments.
[0032] Please see Figure 1 , Figure 1 A schematic diagram of the structure of a testing device provided in an embodiment of this application. Figure 1 .like Figure 1 As shown, the device includes: an audio signal pickup module 10, an amplification module 20, and a playback module 30.
[0033] The audio signal pickup module 10, the amplification module 20, and the playback module 30 are connected in sequence.
[0034] The audio signal pickup module 10 is used to receive the radio frequency signal emitted by the T-Coil coil in the device under test, convert the radio frequency signal into an electrical signal, and input the electrical signal to the amplification module 20.
[0035] The amplification module 20 is used to amplify the electrical signal to obtain an amplified signal, and then input the amplified signal to the playback module 30.
[0036] The playback module 30 is used to convert the amplified signal into a perceptible signal; wherein the perceptible signal carries the audio information emitted by the device under test.
[0037] The device under test can be a mobile phone, landline phone, tablet computer, or media playback device, or any other device with HAC functionality.
[0038] The device under test (DUT) contains a T-Coil coil. During operation, the T-Coil coil generates an alternating current under the control of the audio signal within the DUT. According to the Biot-Savart law, this alternating current generates an alternating magnetic field in the space surrounding the T-Coil coil. When the audio signal pickup module 10 approaches the T-Coil coil in the DUT, it passes through this alternating magnetic field. According to Faraday's law of electromagnetic induction, this alternating magnetic field generates an induced electromotive force (EMF), which is the radio frequency (RF) signal. The RF signal carries the audio information emitted by the DUT. The audio signal pickup module 10 can then receive this RF signal and convert it into an electrical signal. This electrical signal can be two differential signals with the same amplitude but opposite phase.
[0039] The audio signal pickup module 10 inputs an electrical signal to the amplification module 20, which then amplifies the signal. Specifically, the amplification module 20 can be configured with an instrumentation amplifier or operational amplifier to amplify the electrical signal, thereby obtaining an amplified signal. This amplified signal is a strong electrical signal sufficient to drive the playback module 30 while retaining the original audio information.
[0040] Amplification module 20 inputs the amplified signal to playback module 30.
[0041] The playback module 30 converts the amplified signal into a perceptible signal, which is a physical signal that can be directly perceived by the tester through their senses. The tester can use the perceptible signal to test whether the T-Coil coil in the device under test is functioning properly.
[0042] In some examples, the playback module 30 includes an amplifier and a speaker. The amplifier further amplifies the signal to obtain a drive signal, which is input to the speaker to drive the speaker diaphragm to vibrate, thereby producing a perceptible sound signal. Testers can accurately determine whether the T-Coil coil in the device under test is functioning properly by listening to the sound quality, clarity, presence of noise, or intermittency of this sound signal.
[0043] In other examples, the playback module 30 includes a control module and indicator lights. The control module receives the amplified signal, determines the relationship between the signal and a preset threshold, and determines the state of the amplified signal. The display state of the indicator lights is controlled according to the state of the amplified signal.
[0044] For example, preset thresholds include a first threshold and a second threshold. The amplified signal status includes no signal, good signal, and distorted signal. Indicator light display status includes red, green, and yellow.
[0045] When the voltage of the amplified signal is less than the first threshold, the control module can determine that the amplified signal is in a state of no signal and control the indicator light to illuminate red. In other words, when the voltage of the amplified signal is less than the first threshold, the amplified signal may not carry audio information, thus indicating that the T-Coil coil in the device under test is damaged. Testers can detect the damage to the T-Coil coil in the device under test by observing the red indicator light.
[0046] When the voltage of the amplified signal is greater than or equal to the first threshold and less than or equal to the second threshold, the control module can determine that the amplified signal status is indicated by a green light. In other words, the voltage of the amplified signal is within the normal range, and the amplified signal normally carries audio information, thus confirming that the T-Coil coil in the device under test is working properly. Testers can determine that the T-Coil coil in the device under test is working properly by observing the green light.
[0047] When the voltage of the amplified signal exceeds the second threshold, the control module determines that the amplified signal is in a yellow light state. This means that if the voltage of the amplified signal is too high, the audio information carried by the amplified signal may be distorted, thus indicating a fault in the T-Coil coil of the device under test. Testers can detect a fault in the T-Coil coil of the device under test by observing the yellow light.
[0048] Based on this, the playback module 30 can determine the state of the amplified signal by the relationship between the amplified signal and the preset threshold, and by changing the display state of the indicator light, the tester can quickly and intuitively perceive the quality of the amplified signal through the indicator light, thereby quickly determining whether the T-Coil coil in the device under test is functioning normally.
[0049] In this embodiment, the audio signal pickup module 10 receives the radio frequency signal emitted by the T-Coil coil in the device under test (DUT), converts the radio frequency signal into an electrical signal, and inputs the electrical signal to the amplification module 20, thereby achieving the capture and conversion of the radio frequency signal. The amplification module 20 amplifies the electrical signal to obtain an amplified signal, and inputs the amplified signal to the playback module 30, thereby amplifying the electrical signal to drive the subsequent playback module 30. The playback module 30 converts the amplified signal into a perceptible signal, which carries the audio information emitted by the DUT. The perceptible signal can be used to test whether the T-Coil coil in the DUT is functioning properly. Based on this, compared with professional hearing aids, the audio signal pickup module 10, amplification module 20, and playback module 30 have lower manufacturing costs, and there is no need to spend money on professional training for testers. Testers can directly perceive the converted signal through their senses to detect the T-Coil coil in the DUT, thereby reducing testing costs.
[0050] Based on the above exemplary description, the audio signal pickup module 10 includes at least one test coil.
[0051] The first end of the test coil is electrically connected to the first input terminal of the amplification module 20, and the second end of the test coil is electrically connected to the second input terminal of the amplification module 20.
[0052] The test coil is used to receive radio frequency signals, convert the radio frequency signals into a first electrical signal and a second electrical signal through electromagnetic coupling, and input the first electrical signal to the first input terminal of the amplification module 20 and the second electrical signal to the second input terminal of the amplification module 20.
[0053] The first and second electrical signals are differential signals with the same amplitude but opposite phase. Using differential signal output can effectively suppress common-mode noise in the test environment and improve the signal-to-noise ratio.
[0054] The number of test coils is related to the number of devices under test. One test coil can test one device under test. When multiple devices under test need to be tested, multiple test coils can be set up to achieve simultaneous testing of multiple devices and improve testing efficiency.
[0055] The specifications or model of the test coil are the same as those of the T-Coil coil in the device under test.
[0056] The specifications of the test coil being identical to those of the T-Coil coil in the device under test (DUT) means that the inductance, DC resistance, quality factor, dimensions, shape, number of turns, and winding method are the same as those of the T-Coil coil in the DUT. The model number of the test coil being identical to that of the T-Coil coil in the DUT means that the test coil and the T-Coil coil in the DUT are components of completely identical model.
[0057] Since T-Coil communication is actually electromagnetic coupling between two coils, using a test coil with the same specifications or model as the T-Coil coil in the device under test conforms to industry standards and can ensure the acquisition of real and reliable signals, thereby improving the accuracy of test results.
[0058] Based on the above exemplary description, the amplification module 20 includes at least one power amplifier.
[0059] The inverting input of the power amplifier is electrically connected to the first end of the test coil, the non-inverting input of the power amplifier is electrically connected to the second end of the test coil, and the output of the power amplifier is electrically connected to the playback module 30.
[0060] The power amplifier is used to differentially amplify the received first and second electrical signals to obtain an amplified signal, and then input the amplified signal to the playback module 30.
[0061] The inverting input of the power amplifier receives the first electrical signal, and the non-inverting input receives the second electrical signal.
[0062] The power amplifier amplifies the voltage difference between the first and second electrical signals to obtain an amplified signal. This amplified signal is a strong electrical signal sufficient to drive the load while retaining the original audio information. Based on this, amplifying the voltage difference between the first and second electrical signals can suppress common-mode interference from the power supply and environment, ensuring that only the useful differential signal is amplified.
[0063] The number of power amplifiers can be set according to the number of test coils. One test coil can correspond to one or two power amplifiers, so that the amplification module 20 can output one or two amplified signals. When one test coil corresponds to one power amplifier, the playback module 30 can be set as a mono device. When one test coil corresponds to two power amplifiers, the playback module 30 can be set as a stereo device, thereby realizing stereo testing of the device under test.
[0064] Based on the above exemplary description, the audio signal pickup module 10 further includes: at least one twisted pair cable; The first input terminal of the twisted pair is electrically connected to the first terminal of the test coil, the second input terminal of the twisted pair is electrically connected to the second terminal of the test coil, the first output terminal of the twisted pair is electrically connected to the first input terminal of the amplifier module, and the second output terminal of the twisted pair is electrically connected to the second input terminal of the amplifier module.
[0065] Twisted pair cable is used to suppress common-mode noise during the transmission of a first electrical signal and a second electrical signal.
[0066] Each twisted pair cable corresponds to a test coil, ensuring that each test coil can suppress common-mode noise during the transmission of electrical signals.
[0067] A twisted-pair cable contains at least two insulated copper wires, which are spirally twisted together at a uniform pitch. When an external interfering magnetic field passes through the twisted-pair loop, induced electromotive forces of similar magnitude but opposite direction are generated on the two wires within each twist pitch. Since these two wires are opposite ends of the differential input, this common-mode interference is suppressed, thus eliminating magnetic field interference. The twisted structure makes the distributed capacitance between the two wires and the interference source essentially the same, resulting in identical coupled noise currents. This also forms common-mode noise, which is suppressed, thus eliminating electric field interference.
[0068] Therefore, the twisted pair cable can ensure that the signal from the audio signal pickup module 10 to the amplification module 20 is as unaffected as possible, thereby improving the accuracy of the test results.
[0069] In addition, the twisted pair cable is easy to move, allowing testers to easily bring the audio signal pickup module 10 close to the T-Coil coil of the device under test without moving other modules, thus making the testing process more convenient.
[0070] Based on the above exemplary description, the device under test includes a first device under test and a second device under test. By setting two test coils in the audio signal pickup module 10 and two power amplifiers in the amplification module 20, the testing device can simultaneously test the first device under test and the second device under test. The following describes the process in conjunction with... Figure 2 This paper describes the specific structure of an audio signal pickup module 10 and an amplification module 20.
[0071] Please see Figure 2 , Figure 2 A schematic diagram of the structure of a testing device provided in an embodiment of this application. Figure 2 .like Figure 2 As shown, the audio signal pickup module 10 includes: a first test coil 11 and a second test coil 12; the amplification module 20 includes: a first power amplifier 21 and a second power amplifier 22.
[0072] The first end of the first test coil 11 is electrically connected to the inverting input of the first power amplifier 21, and the second end of the first test coil 11 is electrically connected to the non-inverting input of the first power amplifier 21; the first end of the second test coil 12 is electrically connected to the inverting input of the second power amplifier 22, and the second end of the second test coil 12 is electrically connected to the non-inverting input of the second power amplifier 22.
[0073] The first test coil 11 is used to receive the first radio frequency signal emitted by the T-Coil coil in the first device under test, convert the first radio frequency signal into a third electrical signal and a fourth electrical signal through electromagnetic coupling, and input the third electrical signal to the inverting input terminal of the first power amplifier 21 and the fourth electrical signal to the non-inverting input terminal of the first power amplifier 21.
[0074] The second test coil 12 is used to receive the second radio frequency signal emitted by the T-Coil coil in the second device under test. It converts the second radio frequency signal into a fifth electrical signal and a sixth electrical signal through electromagnetic coupling. The fifth electrical signal is input to the inverting input terminal of the second power amplifier 22, and the sixth electrical signal is input to the non-inverting input terminal of the second power amplifier 22.
[0075] The first power amplifier 21 and the second power amplifier 22 both include a power supply terminal. The power supply terminal of the first power amplifier 21 and the second power amplifier 22 are electrically connected to a power source. Both the first power amplifier 21 and the second power amplifier 22 include a ground terminal. The ground terminal of the first power amplifier 21 and the ground terminal of the second power amplifier 22 are both grounded. (Power supply terminal and ground terminal) Figure 2 Not shown in the image.
[0076] The first power amplifier 21 is used to differentially amplify the third and fourth electrical signals and then input them to the playback module 30.
[0077] The second power amplifier 22 is used to differentially amplify the fifth and sixth electrical signals and then input them to the playback module 30.
[0078] The amplification module 20 adopts a dual-channel power amplifier architecture, that is, it is equipped with two power amplifiers. The first power amplifier 21 receives the third and fourth electrical signals generated by the first test coil 11, and the second power amplifier 22 receives the fifth and sixth electrical signals generated by the second test coil 12. The first power amplifier 21 and the second power amplifier 22 can perform differential amplification respectively, thereby generating two independent single-ended amplified signals.
[0079] Based on this, the playback module 30 converts the amplified signal output from the first power amplifier 21 and the amplified signal output from the second power amplifier 22 into two independent perceptible signals. The tester can simultaneously determine whether the T-Coil coil in the first device under test and the T-Coil coil in the second device under test are functioning correctly based on these two independent perceptible signals. This enables simultaneous testing of the two devices under test, improving testing efficiency.
[0080] In some examples, the playback module 30 may include headphones. A first power amplifier 21 differentially amplifies the third and fourth electrical signals and inputs the amplified signals to the first channel of the headphones. A second power amplifier 22 differentially amplifies the fifth and sixth electrical signals and inputs the amplified signals to the second channel of the headphones. The first channel of the headphones converts the amplified signal output from the first power amplifier 21 into a first audio signal, and the second channel converts the amplified signal output from the second power amplifier 22 into a second audio signal. This allows the tester to simultaneously determine the functionality of the T-Coil coil in the first device under test (DUT) based on the first audio signal and the functionality of the T-Coil coil in the second DUT based on the second audio signal. This allows testing of two DUTs using a single headphone, saving testing costs.
[0081] Based on this, the testing device can simultaneously test the T-Coil coil in the first device under test and the T-Coil coil in the second device under test, thereby improving testing efficiency.
[0082] Based on the above exemplary description, in the case where the audio signal pickup module 10 includes a first test coil 11 and a second test coil 12, and the amplification module 20 includes a first power amplifier 21 and a second power amplifier 22, please refer to... Figure 3 , Figure 3 A schematic diagram of the structure of a testing device provided in an embodiment of this application. Figure 3 .like Figure 3 As shown, the audio signal pickup module 10 also includes: a first twisted pair cable 13 and a second twisted pair cable 14.
[0083] The first input terminal of the first twisted pair 13 is electrically connected to the first terminal of the first test coil 11, the second input terminal of the first twisted pair 13 is electrically connected to the second terminal of the first test coil 11, the first output terminal of the first twisted pair 13 is electrically connected to the inverting input terminal of the first power amplifier 21, and the second output terminal of the first twisted pair 13 is electrically connected to the non-inverting input terminal of the first power amplifier 21; the first input terminal of the second twisted pair 14 is electrically connected to the first terminal of the second test coil 12, the second input terminal of the second twisted pair 14 is electrically connected to the second terminal of the second test coil 12, the first output terminal of the second twisted pair 14 is electrically connected to the inverting input terminal of the second power amplifier 22, and the second output terminal of the second twisted pair 14 is electrically connected to the non-inverting input terminal of the second power amplifier 22.
[0084] The first twisted pair 13 is used to suppress common-mode noise during the transmission of the third and fourth electrical signals; The second twisted pair 14 is used to suppress common-mode noise during the transmission of the fifth and sixth electrical signals.
[0085] Based on this, the first twisted pair 13 can reduce the interference on the third and fourth electrical signals from the first test coil 11 to the first power amplifier 21, and the second twisted pair 14 can reduce the interference on the fifth and sixth electrical signals from the second test coil 12 to the second power amplifier 22, thereby improving the accuracy of the test results.
[0086] Based on the above exemplary description, the device under test only includes a first device under test. By setting a test coil in the audio signal pickup module 10 and two power amplifiers in the amplification module 20, the testing device can perform dual-channel testing on the first device under test. The following describes the process in conjunction with... Figure 4 This paper describes the specific structure of an audio signal pickup module 10 and an amplification module 20.
[0087] Please see Figure 4 , Figure 4 A schematic diagram of the structure of a testing device provided in an embodiment of this application. Figure 4 .like Figure 4 As shown, the audio signal pickup module includes: a first test coil 11; the amplification module 20 includes: a first power amplifier 21 and a second power amplifier 22; the playback module 30 includes headphones 31.
[0088] The first end of the first test coil 11 is electrically connected to the inverting input terminal of the first power amplifier 21 and the inverting input terminal of the second power amplifier 22, respectively, and the second end of the first test coil 11 is electrically connected to the non-inverting input terminal of the first power amplifier 21 and the non-inverting input terminal of the second power amplifier 22, respectively.
[0089] The first power amplifier 21 and the second power amplifier 22 both include a power supply terminal. The power supply terminal of the first power amplifier 21 and the second power amplifier 22 are electrically connected to a power source. Both the first power amplifier 21 and the second power amplifier 22 include a ground terminal. The ground terminal of the first power amplifier 21 and the ground terminal of the second power amplifier 22 are both grounded. (Power supply terminal and ground terminal) Figure 4 Not shown in the image.
[0090] The first test coil 11 is used to receive the first radio frequency signal emitted by the T-Coil coil in the first device under test, convert the first radio frequency signal into a third electrical signal and a fourth electrical signal through electromagnetic coupling, and input the third electrical signal to the inverting input terminal of the first power amplifier 21 and the inverting input terminal of the second power amplifier 22, and input the fourth electrical signal to the non-inverting input terminal of the first power amplifier 21 and the non-inverting input terminal of the second power amplifier 22.
[0091] The first power amplifier 21 is used to differentially amplify the third and fourth electrical signals and then input them to the first channel of the headphone 31; the second power amplifier 22 is used to differentially amplify the third and fourth electrical signals and then input them to the second channel of the headphone 31.
[0092] Based on this, the first power amplifier 21 and the second power amplifier 22 form a dual-channel power amplifier architecture, realizing balanced signal processing and improving the ability to suppress common-mode noise. After receiving the amplified signal output from the first power amplifier 21 and the amplified signal output from the second power amplifier 22, the playback module 30 can compare and monitor the two signals, thereby further improving the accuracy of the test.
[0093] The first channel of the earphone 31 can convert the amplified signal output by the first power amplifier 21 into a first sound signal, and the second channel of the earphone 31 can convert the amplified signal output by the second power amplifier 22 into a second sound signal, so that the tester can determine whether the T-Coil coil in the first device under test is functioning properly based on the first sound signal and the second sound signal.
[0094] Based on the above exemplary description, in the case where the audio signal pickup module 10 includes a first test coil 11, the amplification module 20 includes a first power amplifier 21 and a second power amplifier 22, and the playback module 30 includes headphones 31, please refer to... Figure 5 , Figure 5 A schematic diagram of the structure of a testing device provided in an embodiment of this application. Figure 5 .like Figure 5 As shown, the audio signal pickup module 10 also includes a first twisted pair cable 13.
[0095] The first input terminal of the first twisted pair 13 is electrically connected to the first terminal of the first test coil 11, the second input terminal of the first twisted pair 13 is electrically connected to the second terminal of the first test coil 11, the first output terminal of the first twisted pair 13 is electrically connected to the inverting input terminal of the first power amplifier 21 and the inverting input terminal of the second power amplifier 22, and the second output terminal of the first twisted pair 13 is electrically connected to the non-inverting input terminal of the first power amplifier 21 and the non-inverting input terminal of the second power amplifier 22.
[0096] The first twisted pair 13 is used to suppress common-mode noise during the transmission of the third and fourth electrical signals; Based on this, the first twisted pair 13 can reduce the interference to the third and fourth electrical signals from the first test coil 11 to the first power amplifier 21 and the second power amplifier 22, thereby improving the accuracy of the test results.
[0097] Based on the above exemplary description, the playback module 30 includes headphones; the perceptible signal is an audio signal.
[0098] Headphones are used to convert amplified signals into sound signals, which carry audio information emitted by the device under test.
[0099] Headphones can convert amplified signals into sound signals that testers can directly perceive. Using headphones as a conversion component can provide a high-fidelity, interference-resistant audio playback method, enabling testers to quickly and intuitively determine whether the T-Coil coil in the device under test is functioning properly.
[0100] The headphones can be over-ear monitors, in-ear headphones, Bluetooth headphones, etc. Compared to professional hearing aids, headphones are less expensive and require less technical expertise, thus reducing testing costs.
[0101] After receiving the signal output from the headphones, the tester can determine that the T-Coil coil in the device under test is functioning normally based on the following auditory characteristics: clear and distortion-free, low background noise, and sufficient signal strength.
[0102] Among these, "clear and distortion-free" means that the sound signals from both the left and right sides are clearly distinguishable in both ears, without distortion, popping, or muffled sounds. "Low background noise" means that when there is no signal or signal intermittently, the background hissing or buzzing sounds heard in both ears are very faint, and the noise levels on both sides are consistent. "Sufficient signal strength" means that with a reasonable gain setting, the sound is loud without needing to turn the volume up to maximum. If the above auditory characteristics are not met, the tester can determine that the T-Coil coil in the device under test is malfunctioning, thus enabling the testing of the T-Coil coil.
[0103] In some examples, the amplification module 20 further includes: a headphone jack; a first pin of the headphone jack is electrically connected to the output of the first power amplifier 21, a second pin of the headphone jack is connected to the second power amplifier 22, and a ground pin of the headphone jack is grounded.
[0104] The headphone jack is an interface that matches headphones, such as a 3.5mm or 6.35mm stereo audio jack. Headphones can be electrically connected to the first power amplifier 21 and the second power amplifier 22 through the headphone jack.
[0105] The headphone jack provides a standardized connection, allowing the use of any standard stereo headphones in the playback module 30 without the need for custom cables. Furthermore, the headphone jack can correctly output the signal from the amplification module 20 to the corresponding pins of the headphone plug, ensuring that the tester can hear both audio signals.
[0106] Based on the above exemplary description, the playback module 30 includes an oscilloscope; the perceptible signal is a waveform image.
[0107] An oscilloscope is used to convert amplified signals into waveform images, which carry audio information emitted by the device under test.
[0108] An oscilloscope can sample and visualize amplified signals, plotting the amplified signal as a voltage waveform that changes over time and displaying it on the oscilloscope screen. By observing the waveform image on the oscilloscope screen, testers can objectively and quantitatively analyze whether the T-Coil coil is functioning properly, thereby improving the accuracy of the test.
[0109] The amplitude of the waveform image can display the peak voltage of the signal, which can be used to determine whether the output strength of the T-Coil coil in the device under test meets the standard.
[0110] The frequency of a waveform image can display the frequency of a signal, which can be used to determine whether the output of a T-Coil coil is accurate. For example, if the device under test plays a 1kHz test tone, the period of the waveform image should conform to 1kHz.
[0111] The signal-to-noise ratio of a waveform image can reflect the noise level of an audio signal.
[0112] Based on this, testers can accurately and objectively determine whether the T-Coil coil in the device under test is functioning properly based on the waveform image.
[0113] In some examples, where the amplification module 20 includes a first power amplifier 21 and a second power amplifier 22, the oscilloscope can convert the amplified signal output from the first power amplifier 21 into a first waveform image and the amplified signal output from the second power amplifier 22 into a second waveform image, allowing the tester to determine whether the T-Coil coil in the device under test is functioning correctly based on the first and second waveform images. The oscilloscope can be set to dual-channel mode to simultaneously display the first and second waveform images.
[0114] When the audio signal pickup module 10 only includes the first test coil 11, since the first waveform image and the second waveform image are generated based on the same radio frequency signal emitted by the device under test, the amplitude, phase and period of the first waveform image and the second waveform image should be consistent.
[0115] Furthermore, by examining the first and second waveform images, testers can also determine if the testing equipment is faulty. For example, if the amplitudes of the first and second waveform images are different, it indicates that the gains of the first and second power amplifiers are different, or that one of the power amplifiers is faulty. If the phases of the first and second waveform images are different, it indicates that a phase shift has occurred in one of the channels.
[0116] When the audio signal pickup module 10 includes a first test coil 11 and a second test coil 12, the amplitude, phase and period of the first waveform image and the second waveform image may be the same or different, depending on whether the radio frequency signals emitted by the first device under test and the second device under test carry the same audio information.
[0117] Exemplarily, this application also provides a testing device, which includes: a fixture and such Figures 1 to 5 The test apparatus shown.
[0118] The fixture is used to fix the device under test so that the T-Coil coil in the device under test is close to the audio signal pickup module 10 in the test device.
[0119] A fixture is a mechanical structure, such as a bracket, buckle, or sponge pad, that can fix the device under test (DUT) and prevent it from moving during the test, thus avoiding affecting the accuracy of the test.
[0120] The fixture can be made of non-conductive and non-magnetic materials to avoid generating magnetic and electric fields that could interfere with the test results, thereby improving the accuracy of the test. The fixture can be adjustable to accommodate devices of different sizes and models.
[0121] The fixture allows the T-Coil coil in the device under test to maintain a preset relative position and distance with the audio signal pickup module 10 in the testing device. This distance can be 5 mm, 10 mm, etc.
[0122] Based on this, when testing the device under test, the device under test can be placed in the fixture by a robotic arm or by a tester. This ensures that the T-Coil coil in the device under test and the audio signal pickup module 10 in the test device maintain a preset relative position and distance, thereby improving the efficiency of electromagnetic coupling between the audio signal pickup module 10 and the T-Coil coil in the device under test, and improving the accuracy of the test.
[0123] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments, combinations of features from different embodiments are intended to be within the scope of this application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.
[0124] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A testing device, characterized in that, The device includes: an audio signal pickup module, an amplification module, and a playback module; The audio signal pickup module, the amplification module, and the playback module are connected in sequence; The audio signal pickup module is used to receive the radio frequency signal emitted by the T-Coil coil in the device under test, convert the radio frequency signal into an electrical signal, and input the electrical signal to the amplification module; wherein, the radio frequency signal carries the audio information emitted by the device under test; The amplification module is used to amplify the electrical signal to obtain an amplified signal, and input the amplified signal to the playback module; The playback module is used to convert the amplified signal into a perceptible signal; wherein the perceptible signal carries audio information emitted by the device under test.
2. The apparatus according to claim 1, characterized in that, The audio signal pickup module includes: at least one test coil; The first end of the test coil is electrically connected to the first input terminal of the amplification module, and the second end of the test coil is electrically connected to the second input terminal of the amplification module. The test coil is used to receive the radio frequency signal, convert the radio frequency signal into a first electrical signal and a second electrical signal through electromagnetic coupling, and input the first electrical signal to the first input terminal of the amplification module and the second electrical signal to the second input terminal of the amplification module.
3. The apparatus according to claim 2, characterized in that, The audio signal pickup module further includes: at least one twisted pair cable; The first input terminal of the twisted pair is electrically connected to the first terminal of the test coil, the second input terminal of the twisted pair is electrically connected to the second terminal of the test coil, the first output terminal of the twisted pair is electrically connected to the first input terminal of the amplification module, and the second output terminal of the twisted pair is electrically connected to the second input terminal of the amplification module. The twisted pair is used to suppress common-mode noise during the transmission of the first electrical signal and the second electrical signal.
4. The apparatus according to claim 2, characterized in that, The amplification module includes: at least one power amplifier; The inverting input terminal of the power amplifier is electrically connected to the first terminal of the test coil, the non-inverting input terminal of the power amplifier is electrically connected to the second terminal of the test coil, and the output terminal of the power amplifier is electrically connected to the playback module. The power amplifier is used to differentially amplify the received first electrical signal and the second electrical signal to obtain an amplified signal, and input the amplified signal to the playback module.
5. The apparatus according to claim 4, characterized in that, The audio signal pickup module includes: a first test coil and a second test coil; the amplification module includes: a first power amplifier and a second power amplifier; The first end of the first test coil is electrically connected to the inverting input terminal of the first power amplifier, and the second end of the first test coil is electrically connected to the non-inverting input terminal of the first power amplifier; the first end of the second test coil is electrically connected to the inverting input terminal of the second power amplifier, and the second end of the second test coil is electrically connected to the non-inverting input terminal of the second power amplifier. The first test coil is used to receive the first radio frequency signal emitted by the T-Coil coil in the first device under test, convert the first radio frequency signal into a third electrical signal and a fourth electrical signal through electromagnetic coupling, and input the third electrical signal to the inverting input terminal of the first power amplifier and the fourth electrical signal to the non-inverting input terminal of the first power amplifier. The second test coil is used to receive the second radio frequency signal emitted by the T-Coil coil in the second device under test, convert the second radio frequency signal into a fifth electrical signal and a sixth electrical signal through electromagnetic coupling, and input the fifth electrical signal to the inverting input terminal of the second power amplifier and the sixth electrical signal to the non-inverting input terminal of the second power amplifier.
6. The apparatus according to claim 5, characterized in that, The audio signal pickup module further includes: a first twisted pair cable and a second twisted pair cable; The first input terminal of the first twisted pair is electrically connected to the first terminal of the first test coil, the second input terminal of the first twisted pair is electrically connected to the second terminal of the first test coil, the first output terminal of the first twisted pair is electrically connected to the inverting input terminal of the first power amplifier, and the second output terminal of the first twisted pair is electrically connected to the non-inverting input terminal of the first power amplifier; the first input terminal of the second twisted pair is electrically connected to the first terminal of the second test coil, the second input terminal of the second twisted pair is electrically connected to the second terminal of the second test coil, the first output terminal of the second twisted pair is electrically connected to the inverting input terminal of the second power amplifier, and the second output terminal of the second twisted pair is electrically connected to the non-inverting input terminal of the second power amplifier. The first twisted pair is used to suppress common-mode noise during the transmission of the third electrical signal and the fourth electrical signal; The second twisted pair is used to suppress common-mode noise during the transmission of the fifth and sixth electrical signals.
7. The apparatus according to claim 4, characterized in that, The audio signal pickup module includes a first test coil; the amplification module includes a first power amplifier and a second power amplifier; the playback module includes headphones. The first end of the first test coil is electrically connected to the inverting input terminal of the first power amplifier and the inverting input terminal of the second power amplifier, respectively; the second end of the first test coil is electrically connected to the non-inverting input terminal of the first power amplifier and the non-inverting input terminal of the second power amplifier, respectively. The first test coil is used to receive the first radio frequency signal emitted by the T-Coil coil in the first device under test, convert the first radio frequency signal into a third electrical signal and a fourth electrical signal through electromagnetic coupling, and input the third electrical signal to the inverting input terminal of the first power amplifier and the inverting input terminal of the second power amplifier, and input the fourth electrical signal to the non-inverting input terminal of the first power amplifier and the non-inverting input terminal of the second power amplifier; The first power amplifier is used to differentially amplify the third electrical signal and the fourth electrical signal and then input them to the first channel of the headphones; the second power amplifier is used to differentially amplify the third electrical signal and the fourth electrical signal and then input them to the second channel of the headphones.
8. The apparatus according to any one of claims 1-6, characterized in that, The playback module includes headphones; the perceptible signal is an audio signal. The earphone is used to convert the amplified signal into a sound signal, the sound signal carrying audio information emitted by the device under test.
9. The apparatus according to any one of claims 1-7, characterized in that, The playback module includes an oscilloscope; the perceptible signal is a waveform image. The oscilloscope is used to convert the amplified signal into a waveform image, which carries audio information emitted by the device under test.
10. A testing device, characterized in that, The device includes: a clamp and a testing apparatus as described in any one of claims 1 to 9; The clamp is used to fix the device under test so that the T-Coil coil in the device under test is close to the audio signal pickup module in the test device.