A detection device for airborne headphones

Abstract

This utility model relates to a testing device for airborne headsets, belonging to the field of aviation equipment testing technology. It includes an MCU (Microcontroller Unit) and a testing unit connected to the MCU. The testing unit includes a transmitting detection subunit, a receiving detection subunit, and an analog-to-digital converter (ADC). The transmitting detection subunit includes an operational amplifier and a first analog switch, while the receiving detection subunit includes a power amplifier, a second analog switch, and a feedback resistor. This utility model achieves rapid testing of airborne headsets by integrating the MCU and the testing unit. The testing unit, including the transmitting and receiving detection subunits and the ADC, can complete a comprehensive test of the headset's transmitting and receiving performance in a short time, greatly improving testing efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of aviation equipment testing technology, specifically relating to a testing device for airborne headphones. Background Technology

[0002] In the aviation field, real-time communication between pilots, ground control centers, and formation members is a core element ensuring the smooth conduct of flight missions and flight safety. Aircraft-borne headsets, as key voice communication devices in this communication link, directly impact the overall communication effectiveness due to their stability and reliability. However, current testing methods for active noise-canceling headsets are significantly inadequate.

[0003] Traditional testing methods largely rely on precise testing and analysis in a laboratory environment. While accurate, this approach is time-consuming and inefficient, failing to meet the demands of modern aviation for rapid response and efficient support. Particularly during high-intensity flight missions, the frequent testing of earpieces has become a pressing issue. Furthermore, the lack of efficient and portable testing equipment, especially in field environments, is a major bottleneck restricting equipment maintenance efficiency. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as the reliance on precise testing and analysis in laboratory environments for the testing of active noise-canceling headsets, which is time-consuming and inefficient. In particular, the lack of efficient and portable testing equipment in field environments has become a major bottleneck restricting equipment maintenance efficiency. This invention provides a testing device for airborne headsets to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A detection device for an airborne headset includes an MCU and a detection unit connected to the MCU. The detection unit includes a transmitting detection subunit, a receiving detection subunit, and an analog-to-digital converter (ADC). The transmitting detection subunit includes an operational amplifier and a first analog switch. The receiving detection subunit includes a power amplifier, a second analog switch, and a feedback resistor. The input terminal of the operational amplifier is connected to the microphone of the airborne headset under test. The output terminal of the operational amplifier is connected to the first input terminal of the ADC through the first analog switch. The input terminal of the second analog switch is connected to the output terminal of the ADC through the power amplifier. The first output terminal of the second analog switch is connected to the receiver of the airborne headset under test. The second output terminal of the second analog switch is connected to the second input terminal of the ADC through the feedback resistor. The ADC, the first analog switch, and the second analog switch are all communicatively connected to the MCU, and the MCU is connected to an industrial control computer.

[0006] A further improvement to this technical solution is that the power amplifier is an LM4871 power amplifier.

[0007] Further improvements to this technical solution include a serial port conversion element of model BL13232E, through which the MCU is connected to the industrial control computer.

[0008] Further improvements to this technical solution include an interface element of model OSDK-14, with the input of the operational amplifier connected to the microphone of the airborne headset under test via the interface element, and the first output of the second analog switch connected to the receiver of the airborne headset under test via the interface element.

[0009] Further improvements to this technical solution include a display screen, which is connected to the output of the MCU.

[0010] Further improvements to this technical solution include a power supply unit that supplies power to the entire device. The power supply unit includes a DC 24V power supply, a 24V to 5V power supply circuit and a 24V to 12V power supply circuit connected to the output of the DC 24V power supply, and a 5V to 3.3V power supply circuit connected to the output of the 24V to 5V power supply circuit.

[0011] Further improvements to this technical solution include a housing and a cover hinged to the top of the housing. The detection unit is located inside the housing, the display screen is mounted on the top of the housing, and the interface element is mounted on the top of the housing on one side of the display screen. A power interface is also provided on the top of the housing on one side of the display screen, and the power interface is connected to the power unit inside the housing.

[0012] Further improvements to this technical solution include a 24V to 5V power supply circuit comprising capacitor C1, a step-down switching regulator U1, capacitor C2, inductor L1, Zener diode D1, resistor R1, capacitor C3, and resistor R2. Capacitor C1 and the input terminal of buck regulator U1 are connected to a 24V DC power supply. The self-boost pin of buck regulator U1 is connected to the first terminal of inductor L1 through capacitor C2. The switching control pin of buck regulator U1 is connected to the first terminal of inductor L1 and the negative terminal of Zener diode D1. The positive terminal of Zener diode D1 is grounded. The second terminal of inductor L1 is connected to the first terminal of resistor R1, the first terminal of capacitor C3, and the 5V DC output terminal. The second terminal of capacitor C3 is grounded. The output voltage feedback pin of buck regulator U1 is connected to the second terminal of resistor R1 and the first terminal of resistor R2. The second terminal of resistor R2 is grounded.

[0013] Further improvements to this technical solution include a 5V to 3.3V power supply circuit comprising capacitor C4, a step-down switching regulator U2, capacitor C5, inductor L2, resistor R3, capacitor C6, capacitor C7, and resistor R4. Capacitor C4 and the input terminal of buck regulator U2 are connected to the DC 5V output terminal. The self-boost pin of buck regulator U2 is connected to the first terminal of inductor L2 through capacitor C5. The switching control pin of buck regulator U2 is connected to the first terminal of inductor L2. The second terminal of inductor L1 is connected to the first terminal of resistor R3, the first terminal of capacitor C6, the first terminal of capacitor C7 and the DC 3.3V output terminal. The second terminal of capacitor C7 is grounded. The output voltage feedback pin of buck regulator U2 is connected to the second terminal of resistor R3, the first terminal of resistor R4 and the second terminal of capacitor C6. The second terminal of resistor R4 is grounded.

[0014] Further improvements to this technical solution include a 24V to 12V power supply circuit comprising capacitor C8, a low-dropout linear regulator U3, a variable resistor R5, a resistor R6, and a capacitor C9. The first terminal of capacitor C8 and the input pin of low-dropout linear regulator U3 are connected to a DC 24V power supply. The voltage adjustment pin of low-dropout linear regulator U3 is connected to the first terminal of variable resistor R5. The output terminal of low-dropout linear regulator U3 is connected to the first terminal of resistor R6, the first terminal of capacitor C9, and the DC 12V output terminal. The second terminal of resistor R6 is connected to the first terminal of variable resistor R5. The second terminals of capacitor C8, variable resistor R5, and capacitor C9 are all grounded.

[0015] The beneficial effects of this utility model are as follows: This invention achieves rapid testing of airborne headsets by integrating an MCU and a detection unit. The detection unit includes a transmitting detection subunit, a receiving detection subunit, and an analog-to-digital converter, which can complete a comprehensive test of the headset's transmitting and receiving performance in a short time, greatly improving testing efficiency.

[0016] The transmitting detection subunit employs an operational amplifier and a first analog switch, while the receiving detection subunit employs a power amplifier, a second analog switch, and a feedback resistor. The precise coordination of these components ensures accurate acquisition and processing of the detection signal. An analog-to-digital converter converts the analog signal into a digital signal, further improving detection accuracy.

[0017] The device is equipped with a display screen that intuitively shows the test results, allowing users to quickly understand the performance status of the headphones. It also features a cabinet design with a hinged lid for easy opening and closing. Interface components and power interfaces are located on the top of the cabinet for convenient connection and operation. Furthermore, the device's compact structure makes it easy to carry, making it particularly suitable for rapid testing in outdoor environments, effectively solving the problems of long testing times and low efficiency associated with traditional testing methods.

[0018] Furthermore, the design principle of this utility model is reliable, the structure is simple, and it has a very wide range of application prospects.

[0019] It is evident that this utility model has outstanding substantive features and significant progress compared with the prior art, and the beneficial effects of its implementation are also obvious. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the relationship of the device.

[0022] Figure 2 This is a schematic diagram of the device.

[0023] Figure 3 This is the schematic diagram of a 24V to 5V power supply circuit.

[0024] Figure 4 This is the schematic diagram of a 24V to 12V power supply circuit.

[0025] Figure 5 This is the schematic diagram of a 5V to 3.3V power supply circuit.

[0026] 110 is the MCU, 120 is the analog-to-digital converter, 131 is the operational amplifier, 132 is the first analog switch, 141 is the power amplifier, 142 is the second analog switch, 143 is the feedback resistor, 150 is the display screen, 160 is the industrial computer, 170 is the enclosure, 180 is the cover, and 190 is the interface component. Detailed Implementation

[0027] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0029] like Figure 1 As shown, this utility model provides a detection device for airborne headphones, including an MCU110 (Microcontroller Unit). The unit (microcontroller) and the detection unit connected to the MCU110 include a transmitting detection subunit, a receiving detection subunit, and an analog-to-digital converter 120. The transmitting detection subunit includes an operational amplifier 131 and a first analog switch 132. The receiving detection subunit includes a power amplifier 141, a second analog switch 142, and a feedback resistor 143. The input terminal of the operational amplifier 131 is connected to the microphone of the airborne headset under test. The output terminal of the operational amplifier 131 is connected to the first input terminal of the analog-to-digital converter 120 through the first analog switch 132. The input terminal of the second analog switch 142 is connected to the output terminal of the analog-to-digital converter 120 through the power amplifier 141. The first output terminal of the second analog switch 142 is connected to the receiver of the airborne headset under test. The second output terminal of the second analog switch 142 is connected to the second input terminal of the analog-to-digital converter 120 through the feedback resistor 143. The analog-to-digital converter 120, the first analog switch 132, and the second analog switch 142 are all communicatively connected to the MCU110. The MCU110 is connected to the industrial computer 160.

[0030] Specifically, the MCU110 uses an STM32F407ZGT6 microcontroller; the operational amplifier 131 uses an OPA2171 operational amplifier to amplify weak audio signals (gain set to 40dB); the power amplifier 141 uses an LM4871 power amplifier; the first analog switch 132 and the second analog switch 142 both use ADG1412 analog switches, which are controlled by the MCU110; the analog-to-digital converter 120 uses an ES8388 analog-to-digital converter, the first input of the analog-to-digital converter 120 acquires the transmitted signal, and the second input of the analog-to-digital converter 120 acquires the received feedback voltage divider signal.

[0031] In addition, the device includes a serial port converter (model BL13232E). The MCU110 is connected to the industrial computer 160 via the serial port converter, enabling efficient data transmission between the MCU110 and the industrial computer 160. The BL13232E acts as a bridge between the serial port and USB or other interfaces, ensuring the stability and speed of data transmission.

[0032] In addition, the device includes an OSDK-14 interface element 190. The input of the operational amplifier 131 is connected to the microphone of the airborne headset under test via the interface element 190, and the first output of the second analog switch 142 is connected to the receiver of the airborne headset under test via the interface element 190. The OSDK-14 interface element 190 acts as a bridge between the input of the operational amplifier 131 and the microphone of the airborne headset under test, effectively ensuring the stability and integrity of the audio signal during transmission, reducing signal attenuation and interference, thereby improving the accuracy of the test results. The OSDK-14 interface element 190 is designed with connection stability and durability in mind, maintaining a reliable electrical connection even under repeated plugging and unplugging and complex environments. This avoids test errors or equipment failures caused by poor contact, ensuring the smooth progress of the test process.

[0033] Furthermore, the device also includes a display screen 150, which is connected to the output of the MCU 110.

[0034] The device also includes a power supply unit that powers the entire device. The power supply unit includes a DC 24V power supply, a 24V to 5V power supply circuit and a 24V to 12V power supply circuit connected to the output of the DC 24V power supply, and a 5V to 3.3V power supply circuit connected to the output of the 24V to 5V power supply circuit.

[0035] like Figure 2 As shown, the device also includes a housing 170 and a cover 180 hinged to the top of the housing 170. The detection unit is located inside the housing 170, the display screen 150 is mounted on the top of the housing 170, and the interface element 190 is mounted on the top of the housing 170 on one side of the display screen 150. A power interface is also provided on the top of the housing 170 on one side of the display screen 150, connecting to the power unit inside the housing 170. To ensure rain and drop resistance, the housing 170 employs a corner-wrapping and sealing design. Screw posts are provided inside the housing 170, allowing for the reduction of excess material while ensuring necessary installation strength and depth. A sealing strip is designed between the housing 170 and the cover 180 to effectively ensure product sealing, and all interfaces are designed with waterproof protective covers to ensure waterproof performance.

[0036] like Figure 3As shown, the 24V to 5V power supply circuit includes capacitor C1, buck switching regulator U1, capacitor C2, inductor L1, Zener diode D1, resistor R1, capacitor C3, and resistor R2. Capacitor C1 and the input terminal of buck switching regulator U1 are connected to a 24V DC power supply. The boost pin of buck switching regulator U1 is connected to the first terminal of inductor L1 via capacitor C2. The switching control pin of buck switching regulator U1 is connected to the first terminal of inductor L1 and the negative terminal of Zener diode D1. The positive terminal of Zener diode D1 is grounded. The second terminal of inductor L1 is connected to the first terminal of resistor R1, the first terminal of capacitor C3, and the 5V DC output terminal. The second terminal of capacitor C3 is grounded. The output voltage feedback pin of buck switching regulator U1 is connected to the second terminal of resistor R1 and the first terminal of resistor R2. The second terminal of resistor R2 is grounded. The 24V to 5V power supply circuit powers the analog switch.

[0037] like Figure 4 As shown, the 5V to 3.3V power supply circuit includes capacitor C4, buck switching regulator U2, capacitor C5, inductor L2, resistor R3, capacitor C6, capacitor C7, and resistor R4. The input terminals of capacitor C4 and buck switching regulator U2 are connected to the DC 5V output terminal. The boost pin of buck switching regulator U2 is connected to the first terminal of inductor L2 via capacitor C5. The switching control pin of buck switching regulator U2 is connected to the first terminal of inductor L2. The second terminal of inductor L2 is connected to the first terminals of resistor R3, capacitor C6, capacitor C7, and the DC 3.3V output terminal. The second terminal of capacitor C7 is grounded. The output voltage feedback pin of buck switching regulator U2 is connected to the second terminals of resistor R3, resistor R4, and capacitor C6. The second terminal of resistor R4 is grounded. The 5V to 3.3V power supply circuit powers the analog-to-digital converter 120, MCU 110, and power amplifier 141.

[0038] like Figure 5 As shown, the 24V to 12V power supply circuit includes capacitor C8, low-dropout linear regulator U3, variable resistor R5, resistor R6, and capacitor C9. The first terminal of capacitor C8 and the input pin of low-dropout linear regulator U3 are connected to a DC 24V power supply. The voltage adjustment pin of low-dropout linear regulator U3 is connected to the first terminal of variable resistor R5. The output terminal of low-dropout linear regulator U3 is connected to the first terminal of resistor R6, the first terminal of capacitor C9, and the DC 12V output terminal. The second terminal of resistor R6 is connected to the first terminal of variable resistor R5. The second terminals of capacitor C8, variable resistor R5, and capacitor C9 are all grounded. This 24V to 12V power supply circuit powers an industrial control computer (160).

[0039] The working principle of this device is as follows: Received call detection: After detection is initiated, the MCU110 sends a pre-stored specific detection signal, which is converted into an analog signal by a digital-to-analog converter (DAC). This analog signal is then amplified by the power amplifier 141 and, via the second analog switch 142 in the received call detection subunit, selects the received call path under test and outputs it to the designated receiver. The testing personnel determine whether the receiver is functioning correctly based on its on-site response. Simultaneously, the attenuated analog signal after voltage division is converted into digital information by the analog-to-digital converter 120 through the feedback resistor 143 and transmitted to the MCU110. The testing personnel calculate the receiver's impedance using the digital information fed back to the MCU110 to determine if the receiver has open circuits, short circuits, or other problems.

[0040] Transmission detection: An external sound source signal is directly applied to the microphone (e.g., speaking into the microphone). The microphone converts the signal into an electrical signal, which is then amplified by an operational amplifier 131. The signal is then transmitted to a digital-to-analog converter via a first analog switch 132, and then transmitted to an MCU 110. The MCU 110 converts the signal into a waveform image data signal (converting the received digital signal into a waveform image is existing technology and will not be described again). The waveform image signal is then transmitted to a display screen 150 for display. The testing personnel judge the transmission quality of the microphone based on the displayed waveform image.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A detection device for airborne headphones, characterized in that, The system includes an MCU (110) and a detection unit connected to the MCU (110). The detection unit includes a transmitting detection subunit, a receiving detection subunit, and an analog-to-digital converter (120). The transmitting detection subunit includes an operational amplifier (131) and a first analog switch (132). The receiving detection subunit includes a power amplifier (141), a second analog switch (142), and a feedback resistor (143). The input of the operational amplifier (131) is connected to the microphone of the onboard headset under test, and the output of the operational amplifier (131) is connected to the analog-to-digital converter (120) through the first analog switch (132). The first input terminal of the second analog switch (142) is connected to the output terminal of the analog-to-digital converter (120) through the power amplifier (141). The first output terminal of the second analog switch (142) is connected to the receiver of the airborne headset to be tested. The second output terminal of the second analog switch (142) is connected to the second input terminal of the analog-to-digital converter (120) through the feedback resistor (143). The analog-to-digital converter (120), the first analog switch (132), and the second analog switch (142) are all connected to the MCU (110) for communication. The MCU (110) is connected to the industrial computer (160).

2. The detection device for airborne headphones according to claim 1, characterized in that, The power amplifier (141) is an LM4871 power amplifier (141).

3. The detection device for airborne headphones according to claim 1, characterized in that, It also includes a serial port conversion element of model BL13232E, through which the MCU (110) is connected to the industrial computer (160).

4. The detection device for airborne headphones according to claim 1, characterized in that, It also includes an interface element (190) of model OSDK-14, the input of operational amplifier (131) is connected to the microphone of the airborne headset under test through the interface element (190), and the first output of the second analog switch (142) is connected to the receiver of the airborne headset under test through the interface element (190).

5. The detection device for airborne headphones according to claim 4, characterized in that, It also includes a display screen (150), which is connected to the output of the MCU (110).

6. The detection device for airborne headphones according to claim 5, characterized in that, It also includes a power supply unit that powers the entire device. The power supply unit includes a DC 24V power supply, a 24V to 5V power supply circuit and a 24V to 12V power supply circuit connected to the output of the DC 24V power supply, and a 5V to 3.3V power supply circuit connected to the output of the 24V to 5V power supply circuit.

7. The detection device for airborne headphones according to claim 6, characterized in that, It also includes a housing (170) and a cover (180) hinged to the top of the housing (170). The detection unit is located inside the housing (170). The display screen (150) is installed on the top of the housing (170). The interface element (190) is installed on the top of the housing (170) on one side of the display screen (150). A power interface is also provided on the top of the housing (170) on one side of the display screen (150). The power interface is connected to the power unit inside the housing (170).

8. The detection device for airborne headphones according to claim 6, characterized in that, The 24V to 5V power supply circuit includes capacitor C1, step-down switching regulator U1, capacitor C2, inductor L1, Zener diode D1, resistor R1, capacitor C3, and resistor R2. Capacitor C1 and the input terminal of buck regulator U1 are connected to a 24V DC power supply. The self-boost pin of buck regulator U1 is connected to the first terminal of inductor L1 through capacitor C2. The switching control pin of buck regulator U1 is connected to the first terminal of inductor L1 and the negative terminal of Zener diode D1. The positive terminal of Zener diode D1 is grounded. The second terminal of inductor L1 is connected to the first terminal of resistor R1, the first terminal of capacitor C3, and the 5V DC output terminal. The second terminal of capacitor C3 is grounded. The output voltage feedback pin of buck regulator U1 is connected to the second terminal of resistor R1 and the first terminal of resistor R2. The second terminal of resistor R2 is grounded.

9. The detection device for airborne headphones according to claim 8, characterized in that, The 5V to 3.3V power supply circuit includes capacitor C4, buck switching regulator U2, capacitor C5, inductor L2, resistor R3, capacitor C6, capacitor C7 and resistor R4; Capacitor C4 and the input terminal of buck regulator U2 are connected to the DC 5V output terminal. The self-boost pin of buck regulator U2 is connected to the first terminal of inductor L2 through capacitor C5. The switching control pin of buck regulator U2 is connected to the first terminal of inductor L2. The second terminal of inductor L1 is connected to the first terminal of resistor R3, the first terminal of capacitor C6, the first terminal of capacitor C7 and the DC 3.3V output terminal. The second terminal of capacitor C7 is grounded. The output voltage feedback pin of buck regulator U2 is connected to the second terminal of resistor R3, the first terminal of resistor R4 and the second terminal of capacitor C6. The second terminal of resistor R4 is grounded.

10. The detection device for airborne headphones according to claim 6, characterized in that, The 24V to 12V power supply circuit includes capacitor C8, low dropout linear regulator U3, variable resistor R5, resistor R6 and capacitor C9; The first terminal of capacitor C8 and the input pin of low-dropout linear regulator U3 are connected to a DC 24V power supply. The voltage adjustment pin of low-dropout linear regulator U3 is connected to the first terminal of variable resistor R5. The output terminal of low-dropout linear regulator U3 is connected to the first terminal of resistor R6, the first terminal of capacitor C9, and the DC 12V output terminal. The second terminal of resistor R6 is connected to the first terminal of variable resistor R5. The second terminals of capacitor C8, variable resistor R5, and capacitor C9 are all grounded.

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