Multifunctional full-channel function experiment bench for automobile power amplifier

Abstract

An automobile power amplifier multifunctional full-channel function experiment bench is characterized in that the automobile power amplifier multifunctional full-channel function experiment bench comprises a test bench, the test bench is provided with a high-pitch loudspeaker, a middle-pitch loudspeaker, a low-pitch loudspeaker and a 10-segment audio level indicator, and the test bench is provided with a high-pitch loudspeaker, a middle-pitch loudspeaker, a low-pitch loudspeaker, a 10-segment audio level indicator, a high-pitch loudspeaker, a middle-pitch loudspeaker, a low-pitch loudspeaker and a 10-segment audio level indicator. An LED dual-display ampere-voltage meter is arranged on the test bench, and a self-locking automobile key switch is arranged on the test bench; according to the invention, all channels of the vehicle-mounted power amplifier can be comprehensively and independently tested, parameters such as different frequency responses, power output and distortion degree can be accurately measured, performance evaluation of the vehicle-mounted power amplifier in various working states is effectively covered, and the problem that a traditional testing means cannot simultaneously consider multi-channel and comprehensive testing is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to car power amplifier rack technical field especially relates to a car power amplifier multifunctional full pass function experiment rack. BACKGROUND

[0002] The audio power amplifier in the vehicle-mounted audio-video system selects and pre-processes the audio input signal, carries out power amplification, and makes the electric signal have the ability to push the sound box, but the existing vehicle-mounted power amplifier rack is relatively backward in technical level, is difficult to adapt to the rapid development of modern vehicle-mounted power amplifier technology, the product function is relatively single, lacks comprehensive evaluation ability of the overall performance of the vehicle-mounted power amplifier, the modular design is insufficient, the expansibility is poor, and it is difficult to flexibly configure and upgrade according to the actual demand, part of the car power amplifier rack can only test the power amplifier of specific type or a few channels, some racks are designed only for single-channel or stereo power amplifier, and cannot meet the full-channel test demand of the multi-channel car power amplifier (such as 5.1 channel, 7.1 channel), resulting in insufficient function when testing the complex vehicle-mounted power amplifier system, in order to solve the above problems, a car power amplifier multifunctional full pass function experiment rack is provided. UTILITY MODEL CONTENTS

[0003] In view of the above technical problems, the utility model provides a car power amplifier multifunctional full pass function experiment rack, which is characterized by comprising a test rack, a high pitch loudspeaker is arranged on the test rack, a medium pitch loudspeaker is arranged on the test rack, a bass loudspeaker is arranged on the test rack, 10 audio level indicators are arranged on the test rack, an LED double display ammeter is arranged on the test rack, and a self-locking automobile key switch is arranged on the test rack.

[0004] Further, the test rack is provided with a control module, a heat sink and a plurality of power supply interface devices.

[0005] Further, the high pitch loudspeaker, the medium pitch loudspeaker and the bass loudspeaker are connected with the control module, the high pitch loudspeaker is used for evaluating the amplification capacity and distortion condition of the power amplifier to high frequency signals, and the medium pitch loudspeaker is used for testing the amplification performance of the power amplifier channel to medium frequency signals.

[0006] The bass loudspeaker is used for detecting the amplification capacity and quality of the power amplifier channel to low frequency signals.

[0007] Further, the 10 audio level indicators divide the level range of the audio signal into 10 parts, each part represents a certain level interval, are used for monitoring the frequency response characteristics of the vehicle-mounted power amplifier, and preliminarily judge the distortion condition.

[0008] Further, the LED double display current-voltage meter can simultaneously measure and display the current and voltage, and monitor the current and voltage changes in the working process of the vehicle-mounted power amplifier in real time.

[0009] The utility model discloses the beneficial effect of:

[0010] Test function comprehensive promotion: can carry out comprehensive and independent test to each channel of vehicle-mounted power amplifier, including the accurate measurement of different frequency response, power output, distortion degree and other parameters, effectively covers the performance evaluation under the multiple working conditions of vehicle-mounted power amplifier, solves the problem that traditional test means cannot simultaneously consider multi-channel and comprehensive test;

[0011] Test precision enhancement: through high-precision signal generation, acquisition and processing system, cooperate the load simulation unit of careful design, greatly improve the accuracy of vehicle-mounted power amplifier performance index measurement, control test error in the very small range, provide reliable data support for the research and development and production of high-quality vehicle-mounted power amplifier, change the situation that product performance is unstable or substandard due to insufficient test precision in the past;

[0012] Test efficiency is improved obviously: the automation control and batch test ability of test bench can complete more vehicle-mounted power amplifier test tasks in unit time, greatly shorten product research and development cycle and production detection time, accelerate product marketing process, reduce production cost, change the situation of low efficiency of traditional manual test, adapt to the demand of rapid development of modern automobile electronic industry;

[0013] Product quality stability improves: by virtue of comprehensive and accurate test, can discover and solve the potential problem of vehicle-mounted power amplifier in time in product production stage, guarantees the performance consistency and stability of product under different environment and working condition, reduces the automobile sound system failure caused by power amplifier quality problem, improves the quality and user experience of whole vehicle, overcomes the drawbacks of product quality uneven of the past due to insufficient test. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the test bench structure schematic drawing of the utility model kind automobile power amplifier multifunctional full channel function experiment test bench;

[0015] Figure 2 It is the rear view of the utility model kind automobile power amplifier multifunctional full channel function experiment test bench's test bench;

[0016] Figure 3 It is the 10 segment audio level indicator circuit board front face structure schematic drawing of the utility model;

[0017] Figure 4 It is the 10 segment audio level indicator circuit board back structure schematic drawing of the utility model;

[0018] Figure 5 It is the control module circuit board front surface structure schematic view of the utility model;

[0019] Figure 6 It is the control module circuit board back surface structure schematic view of the utility model;

[0020] As shown in the figure: 1, test bench;2, tweeter;3, mid-range speaker;4, woofer;5, 10 segment audio level indicator;6, LED double display current voltmeter;7, self-locking automobile key switch. DETAILED DESCRIPTION

[0021] The technical solutions of the utility model will be described clearly and completely below in combination with the drawings, obviously, the described embodiments are a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

[0022] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as the limitation to the utility model. In addition, the terms "first", "second", "third" are only for the description purpose, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the utility model, it needs to be explained that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected;Can be mechanical connection, can also be electrical connection;Can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements. For the person skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances. In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] Embodiment 1

[0025] This utility model provides a multi-functional full-channel test bench for car amplifiers, characterized in that it includes a tweeter 2, a midrange speaker 3, a woofer 4, a 10-segment audio level indicator 5, an LED dual-display current and voltage meter 6, and a self-locking car push-button switch 7 on the test bench 1.

[0026] Furthermore, the test bench 1 contains a control module, a heat sink, and multiple power supply interface devices.

[0027] Furthermore, tweeter 2, midrange speaker 3, and woofer 4 are all connected to the control module. Tweeter 2 is used to evaluate the power amplifier's amplification capability and distortion of high-frequency signals, while midrange speaker 3 is used to test the power amplifier channel's amplification performance of mid-frequency signals.

[0028] Subwoofer 4 is used to test the amplifier channel's amplification capability and quality for low-frequency signals;

[0029] Furthermore, the 10-segment audio level indicator 5 divides the audio signal level range into 10 parts, each segment representing a certain level interval, used to monitor the frequency response characteristics of the vehicle power amplifier and to make a preliminary judgment on the distortion situation.

[0030] Furthermore, the LED dual-display ammeter and voltmeter 6 can simultaneously measure and display the two key electrical quantities of current and voltage, and monitor the changes in current and voltage during the operation of the vehicle power amplifier in real time.

[0031] Example 2

[0032] In actual use, connect the test equipment and install each component on the test bench 1. Ensure that the interfaces are correctly connected to avoid signal transmission interference or damage to the equipment. During the test, monitor the operating status and data recording of the test equipment in real time to ensure the accuracy and reliability of the test results.

[0033] The tweeter 2 is mainly responsible for reproducing the high-frequency part of the audio signal, generally in the frequency range of 2kHz-20kHz. Its diaphragm is usually small and light, so it can vibrate quickly to accurately reproduce high-frequency sound details, such as the high-pitched part of musical instruments (such as the high-pitched string sound of the violin) and the high-frequency overtones of human voices. In a car audio system, it can make the sound crisper and brighter, and enhance the sense of layering and space of the sound.

[0034] The role of the experimental bench invention: when testing the power amplifier channel, the high-frequency loudspeaker 2 can help evaluate the amplification capability, distortion, etc. of the power amplifier for high-frequency signals. For example, by inputting a high-frequency sinusoidal signal to the power amplifier channel connected to the high-frequency loudspeaker 2 through the experimental bench, it is observed whether the sound emitted by the loudspeaker is clear and whether there is noise, and at the same time the quality of the high-frequency signal output by the power amplifier is measured by the test equipment to determine whether the processing of the high-frequency part by the channel meets the requirements.

[0035] The mid-range loudspeaker 3 is used to replay the middle part of the audio frequency spectrum, with a frequency range of approximately 200Hz-2kHz, which contains the bass of most musical instruments and the main part of human voice, and is the "backbone" of sound. Its diaphragm size is moderate, which can balance the clarity and loudness of sound. In the car audio system, the mid-range loudspeaker 3 makes music and voice sound natural and real, allowing the listener to clearly distinguish various sound elements.

[0036] The role of the experimental bench invention: in the bench test, the mid-range loudspeaker 3 is used to test the amplification performance of the power amplifier channel for mid-frequency signals. For example, by inputting a music segment containing rich mid-frequency information to the channel connected to the mid-range loudspeaker 3 through the experimental bench, it is observed whether the sound output by the loudspeaker is full and natural, and the parameters of the mid-frequency signal output by the power amplifier are measured by the test equipment, including gain, harmonic distortion, etc. to evaluate the processing quality of the power amplifier for the mid-frequency part.

[0037] The bass loudspeaker 4 is mainly responsible for restoring the low-frequency part of the audio signal, usually covering a frequency range of 20Hz-200Hz. Its diaphragm is large and heavy, which enables it to push more air and produce a deep and powerful bass effect. In the car audio system, the bass loudspeaker 4 can enhance the rhythm and power of music, such as in the playback of electronic music and rock music, allowing the listener to feel the strong beat and bass shock effect.

[0038] The role of the experimental bench invention: in the experimental bench test, the bass loudspeaker 4 is used to detect the amplification capability and quality of the power amplifier channel for low-frequency signals. For example, by inputting a low-frequency sweep signal to the power amplifier channel connected to the bass loudspeaker 4, the depth and power of the bass are felt, and at the same time the power and distortion of the low-frequency signal output by the power amplifier are checked by the test equipment to determine whether the processing of the bass part by the power amplifier meets the requirements. This is particularly important for the power amplifier test of car subwoofers and other devices.

[0039] The 10-segment audio level indicator 5 can display the intensity of the audio signal in a visual way, dividing the audio signal level range into 10 parts, each segment representing a certain level interval. For example, they are arranged sequentially from the lowest level to the highest level. This allows users to clearly see which range the current audio signal intensity is in. The level of audio signals of different frequencies may change after passing through the power amplifier. The 10-segment audio level indicator 5 can help determine the gain or attenuation of audio signals in different frequency bands. When the audio signal is distorted, the display of the level indicator will also change abnormally. Under normal circumstances, the level of the audio signal should be reasonably distributed in each frequency band and vary within a certain range.

[0040] The LED dual-display current and voltage meter 6 can simultaneously measure and display the two key electrical quantities of current and voltage. For vehicle power amplifier test benches, accurate voltage measurement can reflect the power supply status of the power amplifier circuit and the voltage amplitude of the signal output. It can monitor the current and voltage changes during the operation of the vehicle power amplifier in real time. By analyzing the abnormal current and voltage conditions, the fault point can be quickly located, improving the efficiency of maintenance and debugging. The dual-display function eliminates the need for testers to frequently switch between current and voltage measurements. This allows for convenient observation of current and voltage changes simultaneously, which helps to analyze the performance and operating status of the vehicle power amplifier more comprehensively. The convenience of dual display is even more prominent when it is necessary to study complex situations such as the power characteristics of the power amplifier.

[0041] The self-locking automotive push-button switch 7 can easily turn on and off specific functions of the test bench or the entire system, helping to ensure the safe operation of the test bench and simulate the actual operating environment of a car: enabling the test bench to better simulate the operating environment of equipment inside a car.

[0042] When using it, investigate the testing requirements of the vehicle power amplifier, clarify the test parameters such as power, frequency response, and distortion, and determine the functions and performance goals that the test bench should achieve.

[0043] Design the overall architecture of the test bench according to the requirements, including signal source module, power amplifier module, load simulation module, data acquisition and processing module, and control and display module, and plan the connection and communication methods between each module;

[0044] Select suitable hardware equipment, such as high-performance signal generators, power amplifiers, electronic loads, oscilloscopes, data acquisition cards, etc., and assemble and connect them to build the hardware foundation of the experimental platform. At the same time, do a good job of circuit wiring and shielding to reduce interference.

[0045] Integrate hardware and software, first debug by module, check if each module function is normal, then test each channel and do overall debugging with Smaart software, calibrate and optimize test data, ensure that the test bench can accurately and stably test the full-channel performance of the vehicle-mounted power amplifier;

[0046] Test with vehicle-mounted power amplifier samples with known performance, compare test results with sample nominal parameters, verify the accuracy and reliability of the test bench, and further optimize and improve the test bench according to the verification results;

[0047] Write detailed test bench operation manual, technical report and other documents, record the design principle, operation method, maintenance points, etc. of the test bench, facilitate subsequent use, maintenance and upgrade, at the same time, establish maintenance plan, calibrate and maintain the test bench regularly, ensure its long-term stable operation and performance consistency,

[0048] Add high-precision signal source module to the original test bench, which uses advanced signal generation technology to meet the demand for different signal types in vehicle-mounted power amplifier testing, improve test accuracy and ensure the accuracy and reliability of test results; support multiple signal types, expand test range and meet more comprehensive testing needs;

[0049] Add modular expansion interface to the original test bench, support future possible addition of test functions and equipment access, improve the expansibility and flexibility of the test bench, facilitate configuration and upgrade according to actual needs; reduce future upgrade and maintenance costs;

[0050] Add level indicator and voltage and current display device hardware, improve redundancy design and fault protection mechanism, ensure the stability and reliability of the test bench during long-term operation; improve stability, ensure continuity and stability of the test process, and avoid device burnout due to software failure;

[0051] Add 10-segment audio level indicator 5 hardware, signal strength visualization display, which can display the strength of audio signal in an intuitive way, divide the level range of audio signal into 10 parts, each part represents a certain level interval, for example, from the lowest level to the highest level, so that users can see at a glance where the current audio signal strength is; Frequency response auxiliary judgment, auxiliary monitoring of frequency response characteristics of vehicle-mounted power amplifier, the level of different frequency audio signals may change after passing through the power amplifier, 10-segment audio level indicator 5 can help judge the gain or attenuation of different frequency bands of audio signals; Preliminary judgment of distortion, when audio signal distortion occurs, the display of the level indicator will also change abnormally, under normal circumstances, the level of audio signal in each frequency band should be reasonably distributed and change within a certain range;

[0052] Increasing the number of output channels, up to 32 channels output, adapting to multi-channel audio system test, increasing the number of channels of the experimental bench, which can match the multi-channel output of modern car-mounted power amplifier (such as 5.1 channels, 7.1 channels, etc.), so that all channels of the car-mounted power amplifier can be tested at the same time, simulating the complex audio playback scene in the actual use environment of the car, such as surround sound effect, to ensure that each channel works normally and cooperates well; improve test efficiency, test multiple channels at a time, compared with testing each channel one by one, greatly shorten the test period; comprehensive evaluation of power amplifier performance, can comprehensively evaluate the consistency and coordination between channels of car-mounted power amplifier, by simultaneously inputting the same or different audio signals to multiple channels, observing the output response of each channel, including signal strength, frequency response, distortion, etc. Parameters, better understand whether the performance of each channel of the power amplifier is balanced, and also can study the crosstalk between channels, which is very important to ensure high-quality audio output of car-mounted power amplifier;

[0053] Increasing the variable dynamic simulation car door main and passive three-frequency device hardware, which can accurately locate the sound, three-frequency divides the audio into high, medium and low frequency bands, and the high-frequency speaker can be installed near the ear position, the medium-frequency speaker in the middle of the door, and the low-frequency speaker at the lower part of the door, to realize accurate sound positioning and provide an immersive listening experience for passengers in the car; reduce sound interference, the frequency dividing device can make each speaker focus on its own frequency band, reduce interference and distortion between different frequency bands, such as high-frequency speakers will not produce broken sound due to low-frequency signal influence, making the sound more pure and clear; enhance the sound level, which can clearly display different musical instruments and vocals in their respective frequency bands, such as playing symphony, the sound levels of high-frequency violin, medium-frequency piano and low-frequency drum are distinct, and the music details are rich; adapt to various scenes, adjust the frequency dividing point and gain parameters according to different music styles, such as emphasizing the mid-frequency fullness when listening to classical music, and improving the high-frequency brightness and low-frequency intensity when listening to popular music;

[0054] Increasing the single speaker and audio level indicator control button device hardware, which can adjust three states, the key upwards, the speaker and audio level indicator are both turned on; the key in the middle, the speaker and audio level indicator are both turned off; the key downwards, the speaker is turned off and the audio level indicator is turned on, to prevent signal overload, combined with the level indicator and control button, the volume can be adjusted reasonably according to the display to prevent audio signal overload, protect the power amplifier and speaker of the car audio system, and prolong its service life;

[0055] Increasing the hardware of the power supply interface device can externally connect various test instruments, such as A2B audio instruments, A2B, sound cards; distribute power supply loads, distribute the power supply of multiple devices to different interfaces, avoid excessive load of a single interface, make the power supply more balanced and stable, reduce the risk of device failure or performance decline caused by power overload; reduce power interference, each power supply interface can be equipped with independent filtering and voltage stabilizing circuit, provide pure and stable power supply for connected devices, reduce power interference between different devices, reduce noise in audio signals, and improve sound quality; optimize wiring layout, multiple power supply interfaces can be reasonably distributed according to the installation position of the device, make the power line wiring more orderly, reduce line crossing and confusion, reduce wiring difficulty, and improve installation efficiency;

[0056] Increasing the hardware of the control module device can facilitate monitoring of channel signals; compatible with multiple devices, the control module can be built-in multiple communication protocols and interface standards, easily adapt to different brands and models of car audio devices, whether it is a traditional loudspeaker or a new type of digital audio processor, it can realize seamless connection, reduce system upgrade cost;

[0057] Increasing the heat dissipation plate can prevent overheating, reduce signal interference, slow down component aging, protect the circuit structure, reduce the risk of failure, and enhance environmental adaptability.

[0058] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. The components mentioned in the present application are common techniques in the existing field, which should be understood by the technicians in the industry. The present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A multi-functional, full-channel experimental bench for automotive power amplifiers, characterized in that, The device includes a test bench, on which a tweeter, a midrange speaker, a woofer, a 10-segment audio level indicator, an LED dual-display current and voltmeter, and a self-locking automotive push-button switch are installed.

2. The multi-functional, full-channel experimental bench for automotive power amplifiers according to claim 1, characterized in that, The test bench contains a control module, a heat sink, and multiple power supply interface devices.

3. The multi-functional, full-channel experimental bench for automotive power amplifiers according to claim 2, characterized in that, The tweeter, midrange speaker, and woofer are all connected to the control module. The tweeter is used to evaluate the amplifier's amplification capability and distortion of high-frequency signals. The midrange speaker is used to test the amplifier channel's amplification performance of mid-frequency signals. The woofer is used to test the amplifier channel's amplification capability and quality of low-frequency signals.

4. The multi-functional full-channel experimental bench for automotive power amplifiers according to claim 3, characterized in that, The 10-segment audio level indicator divides the audio signal level range into 10 parts, each segment representing a certain level interval, used to monitor the frequency response characteristics of the vehicle power amplifier and to make a preliminary judgment on distortion.

5. The multi-functional full-channel experimental bench for automotive power amplifiers according to claim 4, characterized in that, The LED dual-display ammeter and voltmeter can simultaneously measure and display the two key electrical quantities of current and voltage, and monitor the changes in current and voltage during the operation of the vehicle power amplifier in real time.

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