Earphone test equipment

Abstract

The utility model discloses earphone test equipment, which comprises a shell, a first accommodating groove and a second accommodating groove which are adjacent to each other are arranged on the top wall of the shell along the X-axis direction of the shell, and an adjacent third accommodating groove is arranged at one end of the first accommodating groove along the Y-axis direction of the first accommodating groove; a circuit board is vertically installed in the first containing groove, a power source is installed in the second containing groove, and a switch is installed in the third containing groove. The side wall, close to the first accommodating groove, of the shell is provided with an earphone jack; the circuit board is electrically connected with the switch, the power supply and the earphone jack. According to the earphone testing equipment, the first accommodating groove for installing the circuit board, the second accommodating groove for installing the power supply and the third accommodating groove for installing the switch are adjacently and compactly arranged, and the circuit board is vertically arranged in the first accommodating groove, so that the occupied space of the shell is reduced, and the whole earphone testing equipment is smaller in size and convenient to carry.

Description

Technical Field

[0001] The utility model relates to the technical field of testing, in particular to an earphone testing device. Background Art

[0002] Aviation headsets are crucial to flight safety, ensuring effective communication between crew members and clear communication with ground control towers. If a headset is not properly inspected before flight and a sound-depriving malfunction occurs, pilots wearing the headset will be unable to produce or receive sound, posing a risk to flight operations.

[0003] Therefore, existing testing equipment for aviation headsets is used to simulate a flight environment. The tester then wears the aviation headset and plugs it into the test equipment to test whether the headset can pick up the user's voice. However, the existing test equipment is bulky and not easy to carry.

[0004] Therefore, in order to solve the above problems, different companies have proposed different design solutions for miniaturizing test equipment, but the concepts of different design solutions are different, resulting in different effects.

[0005] Therefore, providing a smaller and more portable testing device is a technical problem to be solved. Utility Model Content

[0006] In view of this, the present invention provides an earphone testing device, comprising a housing, wherein a top wall of the housing is provided with a first accommodating groove and a second accommodating groove adjacent to each other along the X-axis direction thereof, and an adjacent third accommodating groove is provided at one end of the first accommodating groove along the Y-axis direction thereof;

[0007] A circuit board is vertically installed in the first receiving slot, a power supply is installed in the second receiving slot, and a switch is installed in the third receiving slot;

[0008] The housing is provided with an earphone jack on a side wall close to the first receiving groove;

[0009] The circuit board is electrically connected to the switch, the power supply and the headphone jack respectively.

[0010] Furthermore, the circuit board includes a power amplifier unit, an isolation unit, a first connector H1 connected to the headphone jack, a second connector H2 connected to the switch, and a third connector H3 connected to the power supply;

[0011] The power amplifier unit includes an amplifier chip U1 and a capacitor C2; the isolation unit includes an adjustable resistor R2, a resistor R3, a capacitor C4 and a capacitor C6;

[0012] A capacitor C2 is connected in series between pins 1 and 8 of the amplifier chip U1. Pin 3 of the amplifier chip U1 is connected to the center tap end of the adjustable resistor R2. The first end of the adjustable resistor R2 is connected to the first end of the capacitor C6. The second end of the capacitor C6 and the first end of the resistor R3 are both connected to pin 3 of the first connector H1. Pin 1 of the first connector H1 is connected to the first end of the capacitor C4. The second end of the capacitor C4 is connected to pin 5 of the amplifier chip U1.

[0013] Pin 6 of the amplifier chip U1 is connected to the second end of the resistor R3 and pin 1 of the second connector H2 respectively. Pin 2 of the second connector H2 and pin 1 of the third connector H3 are both connected to pin VCC.

[0014] The second end of the adjustable resistor R2, pins 2 and 4 of the first connector H1, and pins 2 and 4 of the amplifier chip U1 are all grounded.

[0015] Furthermore, the circuit board further includes a filtering unit, and the filtering unit includes a capacitor C1 and a capacitor C3;

[0016] Pin 7 of the amplifier chip U1 is connected to the first end of the capacitor C3, and pin 6 of the amplifier chip U1 is also connected to the positive electrode of the capacitor C1. The negative electrode of the capacitor C1 and the second end of the capacitor C3 are both grounded.

[0017] Furthermore, the circuit board further includes an indication unit, and the indication unit includes a light emitting diode LED1 and a resistor R1;

[0018] Pin 6 of the amplifier chip U1 is also connected to the anode of the light emitting diode LED1 , the cathode of the light emitting diode LED1 is connected to the first end of the resistor R1 , and the second end of the resistor R1 is grounded.

[0019] Furthermore, the circuit board further includes an RC unit, and the RC unit includes a capacitor C5 and a resistor R4;

[0020] Pin 5 of the amplifier chip U1 is also connected to the positive electrode of the capacitor C5, the negative electrode of the capacitor C5 is connected to the first end of the resistor R4, and the second end of the resistor R4 is grounded.

[0021] Furthermore, the testing device further includes a top cover, which can be matched and covered on the top wall of the shell.

[0022] Furthermore, the top cover is provided with an assembly through hole corresponding to the switch;

[0023] When the top cover is matched with the housing, the switch can extend out of the assembly through hole.

[0024] Furthermore, the top cover is provided with a battery cover hole corresponding to the power supply, and the battery cover hole is provided with a battery cover plate that is matched and snapped together with the battery cover hole.

[0025] Compared with the prior art, the present invention has at least the following beneficial effects:

[0026] The utility model arranges a first receiving slot for installing a circuit board, a second receiving slot for installing a power supply, and a third receiving slot for installing a switch adjacent to and compactly, and vertically installs the circuit board in the first receiving slot to reduce the space occupied by the shell, thereby making the entire headphone testing device smaller and easier to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention pertains; the terms used in the specification of the application are intended only to describe specific embodiments and are not intended to limit this invention; the terms "including" and "having," as well as any variations thereof, in the specification and claims of this invention and the accompanying drawings are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the specification and claims of this invention and the accompanying drawings are used to distinguish between different objects, not to describe a specific order.

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a schematic structural diagram of the housing proposed in the present invention;

[0030] Figure 2 This is an exploded schematic diagram of the top cover proposed in the present invention;

[0031] Figure 3 This is a schematic structural diagram of the bottom of the top cover proposed in the present invention;

[0032] Figure 4 This is a circuit diagram of the circuit board proposed in the utility model.

[0033] Reference numerals:

[0034] 10. Housing;

[0035] 101, first receiving slot; 102, second receiving slot; 103, third receiving slot; 104, headphone jack; 105, second stud hole;

[0036] 111. Power amplifier unit; 112. Isolation unit; 113. Filter unit; 114. Indication unit; 115. RC unit;

[0037] 20. Top cover;

[0038] 201. Assembly through hole; 202. Battery cover hole; 203. Battery cover plate; 204. First stud hole; 205. Observation through hole; 206. Limiting portion. DETAILED DESCRIPTION

[0039] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly stated. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0040] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0041] In one embodiment, in order to solve the problem of miniaturization of the test equipment and portability, Figure 1 The present invention provides an earphone testing device, comprising a housing 10, wherein a top wall of the housing 10 is provided with a first receiving groove 101 and a second receiving groove 102 adjacent to each other along the X-axis direction thereof, and an adjacent third receiving groove 103 is provided at one end of the first receiving groove 101 along the Y-axis direction thereof;

[0042] An earphone jack 104 is provided on a side wall of the housing 10 close to the first receiving slot 101 ; and the second receiving slot 102 , the third receiving slot 103 and the earphone jack 104 are all in communication with the first receiving slot 101 ;

[0043] A circuit board (not shown, same as above) is vertically mounted in the first receiving slot 101 , a power supply (not shown, same as above) is mounted in the second receiving slot 102 , and a switch (not shown, same as above) is mounted in the third receiving slot 103 ;

[0044] The circuit board is electrically connected to the switch, the power supply, and the headphone jack 104 respectively.

[0045] It should be noted that the earphone in this embodiment is preferably an aviation earphone, and the plug of the aviation earphone is correspondingly inserted into the earphone jack 104 .

[0046] Therefore, in this embodiment, the first receiving groove 101 for installing the circuit board, the second receiving groove 102 for installing the power supply, and the third receiving groove 103 for installing the switch are arranged adjacently and compactly, and the circuit board is vertically installed in the first receiving groove 101 to reduce the space occupied by the shell 10, thereby making the entire headphone testing equipment smaller and easier to carry.

[0047] In order to ensure the test function of the earphone test equipment proposed in this embodiment, refer to the attached Figure 4 , this embodiment proposes a circuit board structure:

[0048] The circuit board includes a power amplifier unit 111, an isolation unit 112, a filter unit 113, an indication unit 114, an RC unit 115, a first connector H1 connected to the headphone jack 104, a second connector H2 connected to the switch, and a third connector H3 connected to the power supply;

[0049] The power amplifier unit 111 includes an amplifier chip U1 and a capacitor C2; the isolation unit 112 includes an adjustable resistor R2, a resistor R3, a capacitor C4, and a capacitor C6; the filter unit 113 includes a capacitor C1 and a capacitor C3; the indicator unit 114 includes a light-emitting diode LED1 and a resistor R1; the RC unit 115 includes a capacitor C5 and a resistor R4;

[0050] A capacitor C2 is connected in series between pins 1 and 8 of the amplifier chip U1. Pin 3 of the amplifier chip U1 is connected to the center tap end of the adjustable resistor R2. The first end of the adjustable resistor R2 is connected to the first end of the capacitor C6. The second end of the capacitor C6 and the first end of the resistor R3 are both connected to pin 3 of the first connector H1. Pin 1 of the first connector H1 is connected to the first end of the capacitor C4. The second end of the capacitor C4 and the positive electrode of the capacitor C5 are both connected to pin 5 of the amplifier chip U1. The negative electrode of the capacitor C5 is connected to the first end of the resistor R4.

[0051] Pin 6 of the amplifier chip U1 is connected to the second end of the resistor R3, the positive electrode of the capacitor C1, the positive electrode of the light-emitting diode LED1, and pin 1 of the second connector H2, respectively. Pin 2 of the second connector H2 and pin 1 of the third connector H3 are both connected to pin VCC. The cathode of the light-emitting diode LED1 is connected to the first end of the resistor R1.

[0052] Pin 7 of the amplifier chip U1 is connected to the first end of the capacitor C3;

[0053] The second end of the resistor R1, the second end of the adjustable resistor R2, the second end of the resistor R4, the negative electrode of the capacitor C1, the second end of the capacitor C3, pins 2 and 4 of the first connector H1, pin 2 of the third connector H3, and pins 2 and 4 of the amplifier chip U1 are all grounded.

[0054] It should be noted that, in this embodiment, the first connector H1 is preferably a four-pin terminal block, and the first connector H1 is connected to the four pins of the headphone jack 104 through wires; the second connector H2 and the third connector H3 are preferably two-pin terminal blocks, and the second connector H2 is connected to the two pins of the switch through wires, and the third connector H3 is connected to the two pins (positive and negative poles) of the power supply through wires.

[0055] Because if the aviation headset fails to make sound during the flight, it will lead to the following consequences:

[0056] (1) Pilots cannot hear their own voices and may doubt their own voice output, which in turn affects the effectiveness of communication with air traffic control (ATC) or other crew members.

[0057] (2) Pilots’ hesitation or repeated sending of information due to not being able to hear their own voices may delay the decision-making process and increase flight safety risks.

[0058] (3) Because pilots cannot confirm whether their instructions have been conveyed correctly, they may repeat instructions or take other remedial measures, which may lead to unnecessary misunderstandings or operational errors.

[0059] Therefore, it is very necessary to test aviation headsets. The testing process is as follows:

[0060] When the aviation headset needs to be tested before use, the tester first presses the switch of the headset test device, and the light-emitting diode LED1 lights up, so that the entire headset test device starts normally. Then the tester inserts the plug of the aviation headset to be tested into the corresponding headphone jack 104, and then puts on the aviation headset to be tested for testing. In this way, the headset test device can simulate the flight environment to test whether the aviation headset can receive the sound of the user's own speech in the simulated flight environment. If the tester cannot hear the sound of his own speech in the aviation headset, it means that the aviation headset has a sound loss fault and needs to be repaired; if the tester can hear the sound of his own speech in the aviation headset, it means that the aviation headset has not suffered a sound loss fault and the aviation headset can be used normally.

[0061] It should be noted that the power amplifier unit 111 in the circuit board can amplify the audio signal received by the headphone test equipment to a level that can be received and played by the aviation headset, and the capacitor C2 is used to select the circuit gain multiple; the model of the amplifier chip U1 in this embodiment is illustrated by an 8-pin LM386 chip, and pin 1 of the LM386 chip is the GAIN pin, pin 2 of the LM386 chip is the -IN PUT pin, pin 3 of the LM386 chip is the +IN PUT pin, pin 4 of the LM386 chip is the GND pin, pin 5 of the LM386 chip is the VOUT pin, pin 6 of the LM386 chip is the VS pin, pin 7 of the LM386 chip is the BYP pin, and pin 8 of the LM386 chip is the GAIN pin.

[0062] Isolation unit 112 is used to ensure that there is no direct electrical connection between the input and output signals of the aviation headset, thereby avoiding self-oscillation and preventing the signal from generating unnecessary feedback or interference inside the headset test equipment; and capacitor C4 is used to isolate the DC portion of the power output to avoid burning out the speaker; capacitor C6 is used to isolate the DC portion of the audio signal.

[0063] The filter unit 113 can remove noise or unnecessary frequency components to ensure signal purity; the capacitor C1 plays a filtering role, and the capacitor C3 is used to filter out noise to avoid noise caused by bias voltage jumps during power-on and power-off.

[0064] The indication unit 114 is used to indicate the power supply status of the headphone test device; that is, if the light-emitting diode LED1 is on, it indicates that the headphone test device is working normally, and if the light-emitting diode LED1 is off, it indicates that the headphone test device is abnormal and needs to be repaired in time.

[0065] The RC unit 115 is used to compensate for the phase difference generated when the speaker coil passes the AC signal, thereby preventing the power amplifier unit 111 from self-excitation due to positive feedback.

[0066] In order to protect the components in the housing 10, please refer to the attached Figure 1-2 The testing device further includes a top cover 20 , which can be matched and covered on the top wall of the housing 10 .

[0067] It should be noted that the top cover 20 is provided with six first stud holes 204 along its edge, and the shell 10 is provided with second stud holes 105 corresponding to the first stud holes 204. In this way, when the top cover 20 is matched and covered on the top wall of the shell 10, the six bolts are inserted into the first stud holes 204 and the corresponding second stud holes 105 in sequence to prevent the top cover 20 from falling.

[0068] In order to facilitate the tester to press the switch, refer to the attached Figure 2-3 , the top cover 20 is provided with an assembly through hole 201 corresponding to the switch;

[0069] When the top cover 20 is matched with the housing 10 , the switch can extend out of the assembly through hole 201 .

[0070] In order to facilitate the replacement of the power supply so that the headphone test equipment can operate normally, please refer to the attached Figure 2-3 The top cover 20 is further provided with a battery cover hole 202 corresponding to the power supply, and the battery cover hole 202 is provided with a battery cover plate 203 that is matched and snapped in place therewith.

[0071] Among them, refer to the attached Figure 2-3 The top cover 20 further includes an observation hole 205 corresponding to the LED 1. This hole is used to observe whether the LED 1 is illuminated. A stopper 206 is also provided on the side of the hole 205 facing the LED 1. This stopper 206 is used to secure the LED 1 and prevent it from deviating from the hole 205, which would hinder observation of the headphone tester's operating status.

[0072] Obviously, the embodiments described above are only some of the embodiments of the present invention, rather than all of the embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present invention specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of protection of the present invention patent.

Claims

1. An earphone testing device, comprising a housing (10), characterized in that: The top wall of the housing (10) is provided with a first accommodating groove (101) and a second accommodating groove (102) adjacent to each other along the X-axis direction; and an end of the first accommodating groove (101) along the Y-axis direction is provided with a third accommodating groove (103) adjacent to each other; The first receiving slot (101) is vertically mounted with a circuit board, the second receiving slot (102) is mounted with a power supply, and the third receiving slot (103) is mounted with a switch; The housing (10) is provided with an earphone jack (104) on a side wall close to the first receiving groove (101); The circuit board is electrically connected to the switch, the power supply and the headphone jack (104) respectively.

2. The headphone testing device according to claim 1, wherein The circuit board comprises a power amplifier unit (111), an isolation unit (112), a first connector H1 connected to the headphone jack (104), a second connector H2 connected to the switch, and a third connector H3 connected to the power supply; The power amplifier unit (111) includes an amplifier chip U1 and a capacitor C2; the isolation unit (112) includes an adjustable resistor R2, a resistor R3, a capacitor C4, and a capacitor C6; A capacitor C2 is connected in series between pins 1 and 8 of the amplifier chip U1. Pin 3 of the amplifier chip U1 is connected to the center tap end of the adjustable resistor R2. The first end of the adjustable resistor R2 is connected to the first end of the capacitor C6. The second end of the capacitor C6 and the first end of the resistor R3 are both connected to pin 3 of the first connector H1. Pin 1 of the first connector H1 is connected to the first end of the capacitor C4. The second end of the capacitor C4 is connected to pin 5 of the amplifier chip U1. Pin 6 of the amplifier chip U1 is connected to the second end of the resistor R3 and pin 1 of the second connector H2 respectively. Pin 2 of the second connector H2 and pin 1 of the third connector H3 are both connected to pin VCC. The second end of the adjustable resistor R2, pins 2 and 4 of the first connector H1, and pins 2 and 4 of the amplifier chip U1 are all grounded.

3. The headphone testing device according to claim 2, wherein: The circuit board further comprises a filtering unit (113), wherein the filtering unit (113) comprises a capacitor C1 and a capacitor C3; Pin 7 of the amplifier chip U1 is connected to the first end of the capacitor C3, and pin 6 of the amplifier chip U1 is also connected to the positive electrode of the capacitor C1. The negative electrode of the capacitor C1 and the second end of the capacitor C3 are both grounded.

4. The headphone testing device according to claim 2, wherein: The circuit board further comprises an indication unit (114), wherein the indication unit (114) comprises a light emitting diode LED1 and a resistor R1; Pin 6 of the amplifier chip U1 is also connected to the anode of the light emitting diode LED1 , the cathode of the light emitting diode LED1 is connected to the first end of the resistor R1 , and the second end of the resistor R1 is grounded.

5. The headphone testing device according to claim 2, wherein: The circuit board further includes an RC unit (115), wherein the RC unit (115) includes a capacitor C5 and a resistor R4; Pin 5 of the amplifier chip U1 is also connected to the positive electrode of the capacitor C5, the negative electrode of the capacitor C5 is connected to the first end of the resistor R4, and the second end of the resistor R4 is grounded.

6. The headphone testing device according to claim 1, wherein: The testing device further comprises a top cover (20), and the top cover (20) can be matched and covered on the top wall of the housing (10).

7. The headphone testing device according to claim 6, wherein: The top cover (20) is provided with an assembly through hole (201) corresponding to the switch; When the top cover (20) is matched and covered with the housing (10), the switch can extend out of the assembly through hole (201).

8. The headphone testing device according to claim 6, wherein: The top cover (20) is further provided with a battery cover hole (202) corresponding to the power supply, and the battery cover hole (202) is provided with a battery cover plate (203) that is matched and snapped in place therewith.

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