An electromagnetic compatibility method and device based on power amplifier sound effect dynamic adjustment, and electronic equipment

Abstract

The present disclosure provides an electromagnetic compatibility method and device based on power amplifier sound effect dynamic adjustment and electronic equipment, which can realize sound effect dynamic adjustment of a vehicle-mounted power amplifier system based on a backhaul signal, reduce electromagnetic interference risk among a backhaul link, a high-speed digital link and a power amplifier output link from a design source, improve the purity of the backhaul signal and the accuracy of sound effect mode recognition, reduce the risk of EMC exceeding caused by changes in power amplifier gain or clock radiation during dynamic adjustment, and thus improve the working stability, reliability and efficiency of passing vehicle-grade electromagnetic compatibility test of the vehicle-mounted power amplifier system in a complex electromagnetic environment.

Description

Technical Field

[0001] This disclosure relates to the field of automotive electronics technology, and more specifically, to an electromagnetic compatibility method, apparatus, and electronic device based on dynamic adjustment of power amplifier sound effects. Background Technology

[0002] With the development of intelligent connected vehicles and intelligent cockpit technologies, in-vehicle audio systems are no longer limited to basic audio playback functions, but are gradually evolving towards high fidelity, intelligence, and adaptability. To improve the listening experience under different driving environments and audio source content, existing in-vehicle amplifier systems are beginning to incorporate dynamic sound effect adjustment technology based on backsampling signals. This type of technology typically involves setting up a backsampling link at the amplifier output to collect audio signals from the speaker or amplifier output in real time. The backsampling signals are then analyzed by audio processing units such as SOC and DSP to identify the current audio source type, sound effect mode, or in-vehicle acoustic state. Based on this, equalizer parameters, amplifier gain parameters, or other sound effect processing parameters are dynamically adjusted to achieve adaptive sound effect optimization for different application scenarios such as music, news, and voice broadcasts.

[0003] However, the introduction of a sampling link and dynamic sound effect adjustment function into the vehicle power amplifier system significantly increases the difficulty of electromagnetic compatibility design within the system. On the one hand, the sampling link is usually a high-sensitivity analog signal path, and its sampling object is closely related to the high-current switching signal at the power amplifier output. If the sampling signal path is not properly designed in terms of filtering, isolation, wiring, and grounding, it is easy to pick up power amplifier switching noise, high-speed digital noise, or power supply noise, resulting in distortion of the sampling signal, which in turn affects the accuracy of sound effect pattern recognition and parameter adjustment. On the other hand, high-speed digital circuits such as SOC, DSP, DDR interface, and system clock will generate strong high-frequency electromagnetic radiation, and the high-current switching action of Class D power amplifiers can also easily generate conducted interference and radiated interference. These interference sources can affect the overall electromagnetic compatibility performance of the system through power supply, ground plane, wiring coupling, or spatial coupling. Summary of the Invention

[0004] This disclosure provides at least one electromagnetic compatibility method, apparatus, and electronic device based on dynamic adjustment of power amplifier audio effects. It enables vehicle-mounted power amplifier systems to dynamically adjust audio effects based on retrieval signals, while simultaneously reducing the risk of electromagnetic interference between the retrieval link, high-speed digital link, and power amplifier output link from the design stage. This improves the purity of the retrieval signal and the accuracy of audio effect pattern recognition, and reduces the risk of EMC exceeding standards caused by changes in power amplifier gain or clock radiation during dynamic adjustment. Ultimately, this enhances the stability and reliability of the vehicle-mounted power amplifier system in complex electromagnetic environments and improves its efficiency in passing automotive-grade electromagnetic compatibility tests.

[0005] This disclosure provides an electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects, including: During the development phase of the vehicle amplifier system, the functional design goals corresponding to the dynamic sound effect adjustment function and the electromagnetic compatibility design goals corresponding to the vehicle amplifier system are determined. Based on the aforementioned functional design goals, a dynamic sound effect adjustment system architecture is constructed, comprising a retrieval link, an audio processing unit, a power amplifier unit, and a speaker load. Based on the electromagnetic compatibility design objectives, an electromagnetic compatibility risk assessment is conducted on the retrieval link, digital processing link, power amplifier output link, and clock control link in the dynamic sound effect adjustment system architecture, and the corresponding electromagnetic compatibility constraints are determined based on the assessment results. According to the electromagnetic compatibility constraints, electromagnetic interference suppression measures are configured for the sampling link, digital processing link, power amplifier output link and clock control link respectively, so as to form a collaborative design scheme that meets the requirements of dynamic sound effect adjustment function and electromagnetic compatibility. The collaborative design scheme is simulated and tested, and the electromagnetic interference suppression measures and dynamic sound effect adjustment parameters are adjusted according to the simulation results and prototype test results until the vehicle power amplifier system meets the functional design goals and the electromagnetic compatibility design goals.

[0006] In one optional implementation, the functional design objectives corresponding to the dynamic sound effect adjustment function and the electromagnetic compatibility design objectives corresponding to the vehicle amplifier system are determined, specifically including: At least one of the following is determined as the functional design objective: sound effect pattern recognition accuracy, sound effect adjustment response time, and the number of supported sound effect patterns; The electromagnetic compatibility design objective is determined as at least one of the radiated emission requirements, conducted emission requirements, and immunity requirements that the vehicle power amplifier system needs to meet. Based on different audio source content and different vehicle operating environments, corresponding audio effect mode feature models are established.

[0007] In one optional implementation, based on the aforementioned functional design goals, a dynamic sound effect adjustment system architecture is constructed, comprising a sampling link, an audio processing unit, a power amplifier unit, and a speaker load, including: The power amplifier output signal is sampled back to the audio processing unit via the sampling link; The audio processing unit performs feature analysis on the re-sampled signal and matches the corresponding sound effect mode based on the feature analysis results; The digital signal processing parameters and power amplifier gain parameters are adjusted according to the matched sound effect mode in order to dynamically adjust the output sound effect of the speaker load.

[0008] In one optional implementation, an electromagnetic compatibility risk assessment is performed on the retrieval link, digital processing link, power amplifier output link, and clock control link in the dynamic sound effect adjustment system architecture, specifically including: The common-mode rejection capability and power supply rejection capability of the analog mining devices in the mining link are evaluated. An electromagnetic emission risk assessment was conducted on the high-speed digital processing devices, memory interface, and clock source in the audio processing unit. Conducted interference risk assessment is performed on the high-current switching path and power amplifier output path in the power amplifier unit; Based on the electromagnetic compatibility risk assessment results, at least one electromagnetic compatibility constraint is determined from among device selection, filter configuration, wiring spacing, grounding method, and shielding method.

[0009] In one optional implementation, electromagnetic interference suppression measures are configured for the data acquisition link, including: A filtering circuit and a common-mode suppression device are provided before the sampled signal enters the analog-to-digital conversion terminal of the audio processing unit; The filtering circuit includes a π-type filtering circuit, and the common-mode suppression device includes a common-mode choke. The π-type filtering circuit is used to filter out power amplifier switching noise and high-frequency interference, and the common-mode choke is used to suppress common-mode interference in the acquisition link to improve the signal purity of the acquired signal. Configure the mining signal line in the mining link as a differential routing line; The sampling signal line is kept at a preset isolation distance from the high-speed digital signal line, power amplifier output line and high-current power supply line.

[0010] In one optional implementation, electromagnetic interference suppression measures are configured for the digital processing link and the power amplifier output link, including: The circuit board layout is divided into analog sampling area, digital processing area, power amplification current area and power supply area. Set up corresponding ground planes for different areas, and connect the different ground planes at preset locations; Impedance control and grounding processing are applied to the clock lines and high-speed buses in the digital processing link. Shorten the output path between the power amplifier unit and the speaker load, and set the power amplifier output path to a tightly coupled differential pair wiring.

[0011] In one optional implementation, electromagnetic interference suppression measures are configured for the clock control link, including: Enable the spread spectrum function of the audio processing unit and the main clock source to reduce the peak radiation corresponding to the clock base frequency; Dynamic gain management logic is set in the sound effect dynamic adjustment algorithm so that the power amplifier gain is adjusted gradually when the preset change conditions are met, so as to reduce transient electromagnetic radiation caused by transient changes in the power amplifier output current.

[0012] In one optional implementation, the collaborative design scheme is subjected to simulation verification and prototype testing, specifically including: Before the circuit board is manufactured, signal integrity simulation is performed on the quality of the back-sampling signal, power integrity simulation is performed on the stability of the power network, and electromagnetic radiation simulation is performed on the overall radiated emission of the board. If the simulation results do not meet the preset requirements, return to adjust the electromagnetic interference suppression measures; After the prototype was completed, the vehicle-mounted power amplifier system was run in different sound effect modes to conduct near-field scanning and far-field electromagnetic compatibility tests. When the prototype test results do not meet the electromagnetic compatibility design goals, the hardware electromagnetic compatibility design and software control parameters are adjusted based on the test results.

[0013] This disclosure also provides an electromagnetic compatibility device based on dynamic adjustment of power amplifier sound effects, comprising: The design goal determination module is used to determine the functional design goals corresponding to the dynamic sound effect adjustment function and the electromagnetic compatibility design goals corresponding to the vehicle power amplifier system during the development stage of the vehicle power amplifier system. The system architecture module is used to construct a dynamic sound effect adjustment system architecture, including a retrieval link, an audio processing unit, a power amplifier unit, and a speaker load, based on the aforementioned functional design objectives. The risk assessment module is used to conduct electromagnetic compatibility risk assessments on the retrieval link, digital processing link, power amplifier output link, and clock control link in the audio dynamic adjustment system architecture based on the electromagnetic compatibility design objectives, and to determine the corresponding electromagnetic compatibility constraints based on the assessment results. The scheme output module is used to configure electromagnetic interference suppression measures for the sampling link, digital processing link, power amplifier output link and clock control link respectively according to the electromagnetic compatibility constraints, so as to form a collaborative design scheme that meets the requirements of dynamic sound effect adjustment function and electromagnetic compatibility. The test and adjustment module is used to perform simulation verification and prototype testing on the collaborative design scheme, and to adjust the electromagnetic interference suppression measures and dynamic sound effect adjustment parameters according to the simulation verification results and prototype test results, until the vehicle power amplifier system meets the functional design goals and the electromagnetic compatibility design goals.

[0014] This disclosure also provides an electronic device, including: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, they perform the steps of the above-described electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects, or any possible implementation of the above-described electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects.

[0015] This disclosure also provides a computer-readable storage medium storing a computer program that, when executed by a processor, performs the steps of the above-described electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects, or any possible implementation of the above-described electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects.

[0016] This disclosure also provides a computer program product, including a computer program / instructions, which, when executed by a processor, implement the above-described electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects, or the steps in any possible implementation of the above-described electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects.

[0017] This disclosure provides an electromagnetic compatibility method, apparatus, and electronic device based on dynamic adjustment of power amplifier audio effects. While enabling dynamic adjustment of audio effects in an in-vehicle power amplifier system based on the retrieval signal, it reduces the risk of electromagnetic interference between the retrieval link, high-speed digital link, and power amplifier output link from the design stage. This improves the purity of the retrieval signal and the accuracy of audio effect pattern recognition, and reduces the risk of EMC exceeding standards caused by changes in power amplifier gain or clock radiation during dynamic adjustment. Ultimately, it enhances the stability and reliability of the in-vehicle power amplifier system in complex electromagnetic environments and improves its efficiency in passing automotive-grade electromagnetic compatibility tests.

[0018] To make the above-mentioned objects, features and advantages of this disclosure more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. These drawings are incorporated in and constitute a part of this specification. They illustrate embodiments conforming to this disclosure and, together with the specification, serve to explain the technical solutions of this disclosure. It should be understood that the following drawings only show some embodiments of this disclosure and should not be considered as limiting the scope. Those skilled in the art can obtain other related drawings based on these drawings without creative effort.

[0020] Figure 1A flowchart is shown for an electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects provided in an embodiment of this disclosure; Figure 2 A schematic diagram of an electromagnetic compatibility device based on dynamic adjustment of power amplifier sound effects provided in an embodiment of this disclosure is shown. Figure 3 A schematic diagram of an electronic device provided in an embodiment of the present disclosure is shown. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely represents selected embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In this document, the term "and / or" merely describes a relationship, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Furthermore, the term "at least one" in this document means any combination of at least two of any one or more elements. For example, including at least one of A, B, and C can mean including any one or more elements selected from the set consisting of A, B, and C.

[0024] Research has revealed that introducing a sampling link and dynamic audio effect adjustment function into an in-vehicle power amplifier system significantly increases the difficulty of electromagnetic compatibility (EMC) design within the system. On one hand, the sampling link typically involves a high-sensitivity analog signal path, and its sampling target is closely related to the high-current switching signal at the power amplifier output. If the sampling signal path is poorly designed in terms of filtering, isolation, wiring, and grounding, it can easily pick up power amplifier switching noise, high-speed digital noise, or power supply noise, leading to signal distortion and consequently affecting the accuracy of audio effect pattern recognition and parameter adjustment. On the other hand, high-speed digital circuits such as SOCs, DSPs, DDR interfaces, and system clocks generate strong high-frequency electromagnetic radiation. The high-current switching action of Class D power amplifiers also easily generates conducted and radiated interference. These interference sources can affect the overall EMC performance of the system through power supply, ground plane, wiring coupling, or spatial coupling.

[0025] Based on the above research, this disclosure provides an electromagnetic compatibility method, device, and electronic device based on dynamic adjustment of power amplifier sound effects. It can realize dynamic adjustment of sound effects of vehicle power amplifier system based on the back-sampled signal, reduce the risk of electromagnetic interference between the back-sampled link, high-speed digital link and power amplifier output link from the design source, improve the purity of the back-sampled signal and the accuracy of sound effect pattern recognition, and reduce the risk of EMC exceeding the standard caused by changes in power amplifier gain or clock radiation during dynamic adjustment. This improves the working stability and reliability of vehicle power amplifier system in complex electromagnetic environment and the efficiency of passing automotive-grade electromagnetic compatibility tests.

[0026] To facilitate understanding of this embodiment, a detailed description of the electromagnetic compatibility (EMC) method based on dynamic adjustment of power amplifier audio effects disclosed in this disclosure embodiment will be provided first. The execution entity of the EMC method based on dynamic adjustment of power amplifier audio effects provided in this disclosure embodiment is generally a computer device with a certain computing capability. This computer device may include, for example, a terminal device, a server, or other processing devices. The terminal device may be a user equipment (UE), mobile device, user terminal, terminal, cellular phone, cordless phone, personal digital assistant (PDA), handheld device, computing device, in-vehicle device, wearable device, etc. In some possible implementations, this EMC method based on dynamic adjustment of power amplifier audio effects can be implemented by a processor calling computer-readable instructions stored in memory.

[0027] See Figure 1 The diagram shows a flowchart of an electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects provided in an embodiment of this disclosure. The method includes steps S101 to S105, wherein: S101. During the development phase of the vehicle amplifier system, determine the functional design objectives corresponding to the dynamic sound effect adjustment function and the electromagnetic compatibility design objectives corresponding to the vehicle amplifier system.

[0028] In practical implementation, the in-vehicle power amplifier system is an audio power amplifier system installed in the vehicle cabin. It may include an audio processing unit, a power amplifier unit, a sampling link, and speaker loads. The audio processing unit can be a SOC, DSP, or a control chip with integrated audio signal processing functions. The power amplifier unit can be a Class D power amplifier or other power amplifier circuit suitable for in-vehicle audio output. The sampling link is used to obtain sampling signals related to the actual output audio from the power amplifier output or speaker output. During operation, this in-vehicle power amplifier system can analyze the current audio source content, speaker output status, or in-vehicle acoustic environment based on the sampling signals, and dynamically adjust the sound effect parameters according to the analysis results.

[0029] Here, during the development phase of the vehicle amplifier system, the functional design goals for the dynamic sound effect adjustment function and the electromagnetic compatibility (EMC) design goals for the vehicle amplifier system are first determined. This development phase can be understood as the system solution design phase, hardware architecture design phase, or the requirements definition phase after project initiation. In other words, before the specific PCB layout, component parameter configuration, and prototype fabrication are completed, the requirements for the dynamic sound effect adjustment function and EMC are determined as parallel design inputs, rather than performing EMC adjustments separately after the sound effect function design is completed.

[0030] The functional design goals for the dynamic sound effect adjustment function can include at least one of the following: sound effect pattern recognition accuracy, sound effect adjustment response time, and the number of supported sound effect modes. Sound effect pattern recognition accuracy characterizes the system's accuracy in recognizing the current audio source content or sound effect scene, such as distinguishing between music playback, news broadcasts, voice interaction, or other audio scenarios. Sound effect adjustment response time characterizes the response speed from acquiring the retrieval signal, completing feature analysis, determining the target sound effect mode, to completing the sound effect parameter adjustment. It can be set to millisecond-level response to meet the real-time and continuity requirements during in-vehicle audio playback. The number of supported sound effect modes characterizes the types of sound effect modes the system can recognize and adapt to, such as standard mode, music mode, news mode, voice mode, cinema mode, or other preset sound effect modes.

[0031] In some implementations, corresponding sound effect mode feature models can be established based on different audio source content and different vehicle operating environments. Different audio source content can include music, news, voice broadcasts, navigation prompts, telephone voice, etc.; different vehicle operating environments can include different vehicle speeds, different in-vehicle noise levels, different road environments, or different cabin acoustic states, etc. The sound effect mode feature model can be used to describe the spectral characteristics, energy distribution characteristics, dynamic range characteristics, or other audio characteristics of the re-sampled signal under different sound effect modes. Subsequently, during system operation, the audio processing unit can match the features extracted from the real-time re-sampled signal with the pre-established sound effect mode feature model to determine the appropriate sound effect mode or sound effect adjustment strategy to be adopted.

[0032] Here, the electromagnetic compatibility design objectives for a vehicle amplifier system may include at least one of radiated emission requirements, conducted emission requirements, and immunity requirements. Radiated emission requirements limit the level of electromagnetic interference radiated outward through space during operation of the vehicle amplifier system; conducted emission requirements limit the level of electromagnetic interference conducted outward through power lines, ground lines, speaker harnesses, or other connection lines; and immunity requirements characterize the vehicle amplifier system's ability to maintain normal operation in an external electromagnetic interference environment.

[0033] The aforementioned electromagnetic compatibility design objectives can be determined based on automotive-grade electromagnetic compatibility standards, OEM internal testing specifications, or product development requirements. For example, they can correspond to electromagnetic compatibility testing requirements for automotive electronic products such as CISPR 25 and GB / T 18655.

[0034] It should be noted that when determining electromagnetic compatibility (EMC) design objectives, the dynamic operating characteristics of the vehicle amplifier system can also be considered for objective decomposition. Since a vehicle amplifier system with dynamic sound effect adjustment may have different DSP parameters, amplifier gain, output power, and clock operating states in different sound effect modes, its electromagnetic emission characteristics are not fixed. Therefore, in this embodiment, the EMC design objectives can be limited not only to a single static operating state but also to cover the EMC requirements of different sound effect modes, different amplifier output states, and the switching of sound effect parameters. For example, in music mode, news mode, voice broadcast mode, and during mode switching, the system's radiated and conducted emissions must meet preset limits.

[0035] Furthermore, after determining the functional design goals and electromagnetic compatibility (EMC) design goals, a corresponding set of target constraints can be formed. This set of target constraints can serve as the basic input for subsequent system architecture design and hardware / software co-design. For the dynamic audio effect adjustment function, the set of target constraints can limit the sampling accuracy, signal-to-noise ratio (SNR), recognition accuracy, and response time requirements of the retrieval signal; for EMC design, the set of target constraints can limit the interference immunity requirements of the retrieval link, the radiation control requirements of the high-speed digital link, the conducted interference control requirements of the power amplifier output link, the peak radiation control requirements of the clock source, and the compliance requirements for prototype testing.

[0036] Thus, this embodiment does not only address the radiated or conducted emission issues after the prototype fails the test, but also clarifies the dynamic sound effect adjustment function goal and electromagnetic compatibility design goal during the development stage of the vehicle power amplifier system. This allows subsequent sampling link design, audio processing unit selection, power amplifier output link design, PCB layout and routing, and software control strategies to be designed collaboratively around the dual goals.

[0037] S102. Based on the aforementioned functional design goals, construct a dynamic sound effect adjustment system architecture that includes a retrieval link, an audio processing unit, a power amplifier unit, and a speaker load.

[0038] In practical implementation, after determining the functional design goals corresponding to the dynamic sound effect adjustment function, a dynamic sound effect adjustment system architecture is constructed based on these goals. This architecture includes a sampling link, an audio processing unit, a power amplifier unit, and speaker loads. This architecture enables the sampling of the power amplifier output signal, the analysis and processing of the sampled signal, the identification and matching of sound effect modes, and the dynamic adjustment of sound effect parameters. This allows the vehicle power amplifier system to adaptively optimize the output sound effect according to the actual playback content and the vehicle's operating environment.

[0039] Specifically, the power amplifier unit receives the audio signal processed by the audio processing unit and amplifies the audio signal to drive the speaker load for sound output. The power amplifier unit can be a Class D power amplifier or other power amplifiers suitable for in-vehicle audio systems. Since Class D power amplifiers typically achieve power amplification through switching, their outputs contain high-amplitude and high-rate-of-change switching signals. Therefore, when constructing a dynamic sound adjustment system architecture, the power amplifier unit needs to be considered both as an audio output functional module and a potential source of electromagnetic interference in the overall design.

[0040] Here, the speaker load is connected to the output of the power amplifier unit to convert the electrical signal output by the power amplifier unit into a sound signal. The speaker load can be a single speaker or a vehicle speaker system consisting of multiple speakers, such as front door speakers, rear door speakers, center speaker, subwoofer, or other cabin speakers. Since the impedance characteristics, wiring harness length, and placement of the speaker load can all affect the power amplifier output state and the quality of the sampled signal, the speaker load and its connection path can be considered as objects of joint concern for dynamic sound effect adjustment and electromagnetic compatibility design in the system architecture.

[0041] Here, the sampling link is located between the output side of the power amplifier unit and the audio processing unit. It is used to acquire the power amplifier output signal or the speaker signal and transmit the acquired sampled signal to the audio processing unit. The sampling link may include a sampling input terminal, a signal conditioning circuit, an isolation or protection circuit, and a sampling interface connected to the audio processing unit. The signal conditioning circuit can perform voltage division, filtering, buffering, or differential conversion on the high-amplitude signal at the power amplifier output side to adapt it to the sampling range of the audio processing unit. The sampling interface can be connected to the analog-to-digital converter (ADC) terminal of the audio processing unit so that the audio processing unit can digitize the sampled signal.

[0042] In some implementations, the sampling link can acquire the sampling signal from the output path between the power amplifier unit and the speaker load. That is, while the power amplifier unit outputs an audio power signal to the speaker load, the sampling link simultaneously acquires the electrical signal corresponding to the output audio power signal and converts it into a sampling signal suitable for the audio processing unit to recognize and analyze.

[0043] Here, the audio processing unit receives the backsampling signal output from the backsampling link and performs feature analysis and sound effect pattern matching on the backsampling signal. The audio processing unit may include a SOC, DSP, audio codec chip, audio algorithm processing module, or a combination thereof. After receiving the backsampling signal, the audio processing unit can sample, filter, perform time-domain analysis, frequency-domain analysis, or feature extraction on the backsampling signal to obtain audio features reflecting the current audio playback state. These audio features may include spectral distribution, energy distribution, dynamic range, rhythm changes, speech proportion, low-frequency component intensity, or other feature information used to distinguish sound effect patterns.

[0044] Furthermore, after obtaining the audio features, the audio processing unit can match the audio features with a pre-established sound effect mode feature model to determine the target sound effect mode corresponding to the current audio content or the current in-vehicle acoustic environment. The sound effect mode may include a standard mode, music mode, news mode, voice mode, or other sound effect modes suitable for in-vehicle cabin scenarios. For example, when the spectral distribution and dynamic range of the re-sampled signal better match the characteristics of a music mode, the audio processing unit can match a music mode; when the proportion of speech frequency energy in the re-sampled signal is high and the low-frequency components are low, the audio processing unit can match a news mode or a voice mode.

[0045] After determining the target sound effect mode, the audio processing unit adjusts the digital signal processing parameters and power amplifier gain parameters according to the matched sound effect mode to dynamically adjust the output sound effect of the speaker load. The digital signal processing parameters may include equalizer parameters, sound field parameters, loudness compensation parameters, dynamic range control parameters, filtering parameters, or other audio algorithm parameters; the power amplifier gain parameters may include power amplifier output gain, channel gain, bass channel gain, or other control parameters related to the power amplifier output amplitude.

[0046] Specifically, the audio processing unit processes the audio signal to be played and outputs it to the power amplifier unit, which then drives the speaker load for playback. The sampling link samples the power amplifier output signal or the speaker signal and feeds the sampled signal back to the audio processing unit. The audio processing unit analyzes the sampled signal to determine the current sound effect mode or sound effect adjustment requirements. Subsequently, the audio processing unit updates the digital signal processing parameters and / or power amplifier gain parameters based on the analysis results, ensuring that subsequent output audio signals are played according to the updated parameters. Thus, the system can continuously correct the sound effect processing based on the actual output state.

[0047] In this embodiment, the aforementioned dynamic sound effect adjustment system architecture is not constructed solely from an audio function perspective, but also considers the needs of subsequent electromagnetic compatibility (EMC) co-design. For example, the feedback sampling link, as a key link connecting the power amplifier output side and the audio processing unit, not only undertakes the feedback sampling function but is also susceptible to power amplifier switching noise, high-speed digital noise, and power supply noise. Therefore, at the system architecture level, the feedback sampling link needs to be distinguished and isolated from the power amplifier output link and the digital processing link. Furthermore, the audio processing unit relies on high-speed digital resources such as SOC, DSP, clock, and memory when performing feature analysis and pattern matching. Therefore, at the system architecture level, space needs to be reserved for wiring, grounding, and shielding design related to high-speed digital links.

[0048] Thus, this embodiment constructs a dynamic sound effect adjustment system architecture based on functional design goals, including a sampling link, audio processing unit, power amplifier unit, and speaker load. This enables the vehicle power amplifier system to perform real-time sampling of the power amplifier output signal and complete sound effect pattern recognition and sound effect parameter adjustment based on the sampled signal. Simultaneously, this system architecture provides a clear structural foundation for subsequent electromagnetic compatibility risk assessment and electromagnetic interference suppression design for the sampling link, high-speed digital link, power amplifier output link, and clock control link.

[0049] S103. Based on the electromagnetic compatibility design objectives, conduct an electromagnetic compatibility risk assessment on the retrieval link, digital processing link, power amplifier output link, and clock control link in the audio effect dynamic adjustment system architecture, and determine the corresponding electromagnetic compatibility constraints based on the assessment results.

[0050] In practical implementation, after constructing the audio dynamic adjustment system architecture, based on pre-determined electromagnetic compatibility (EMC) design goals, an EMC risk assessment is conducted on the sampling link, digital processing link, power amplifier output link, and clock control link within the audio dynamic adjustment system architecture. The corresponding EMC constraints are then determined based on the assessment results. This step allows for the identification of potential EMC sources, coupling paths, and sensitive nodes in each link before specific circuit design and circuit board layout, thus providing a basis for the subsequent design of filtering, isolation, grounding, shielding, wiring, and software control strategies.

[0051] Specifically, the feedback acquisition link is the feedback acquisition link between the power amplifier output and the audio processing unit. Its main function is to convert the power amplifier output signal or speaker signal into a feedback signal that the audio processing unit can recognize and analyze. Since the feedback signal is usually a small signal or a conditioned analog signal, and the power amplifier output side contains a high-current, high-rate-of-change switching signal, the feedback link is susceptible to power amplifier switching noise, power supply ripple, high-speed digital noise, and spatial radiated noise. When conducting an electromagnetic compatibility risk assessment of the feedback link, the anti-interference capabilities of the feedback input, signal conditioning circuit, feedback acquisition operational amplifier, analog-to-digital converter input, and the feedback signal wiring area should be the primary focus.

[0052] In some implementations, the electromagnetic compatibility risk assessment of the sampling link may include evaluating the common-mode rejection (CMRR) and power supply rejection (PSCR) capabilities of the analog sampling devices. CRR characterizes the sampling link's ability to suppress common-mode interference generated by power amplifier output harnesses, speaker harnesses, or high-speed signal coupling from the surrounding area; PSCR characterizes the sampling acquisition amplifier or signal conditioning circuitry's ability to suppress power supply noise. If the CRR or PSCR capabilities of the sampling devices are insufficient, subsequent design work may require improving the filtering level of the sampling link, adding common-mode rejection devices, optimizing the power supply decoupling structure, or adjusting the device selection for the sampling link.

[0053] Here, the digital processing link can include the SOC, DSP, audio codec, memory interface, high-speed data bus, and digital signal connection paths related to the operation of audio effect algorithms within the audio processing unit. Since the audio processing unit needs to sample, extract features, recognize patterns, and adjust parameters of the re-sampled signal, it typically contains high-frequency clocks, high-speed buses, and digital processing circuitry internally or externally. These components may form radiation sources and may couple to the re-sampled link through the ground plane, power network, or adjacent traces. When conducting an electromagnetic compatibility risk assessment of the digital processing link, the electromagnetic emission risks of high-speed digital processing devices, memory interfaces, control buses, data buses, chip power networks, and digital ground return paths should be the primary focus.

[0054] In some implementations, electromagnetic compatibility (EMC) risk assessment of the digital processing link may include an EMC risk assessment of the high-speed digital processing devices, memory interfaces, and clock-related pins in the audio processing unit. For example, the operating frequency of the SOC or DSP, memory interface speed, bus trace length, edge change rate, return path integrity, and distance from the analog sampling area can be used to determine whether the digital processing link is prone to causing crosstalk to the sampled signal or to creating radiated emission exceedances. If the assessment results indicate a high EMC risk for the digital processing link, constraints such as impedance control, grounding, shortening high-speed traces, moving them away from the sampling area, strengthening power supply decoupling, or optimizing the ground plane return path need to be determined in subsequent designs.

[0055] Here, the power amplifier output link can include the output terminal of the power amplifier unit, the power amplifier output filter structure, the speaker connection terminals, the speaker wiring harness, and the high-current power supply path of the power amplifier unit. For Class D power amplifiers, which achieve power amplification through switching, both the power amplifier output terminal and the power input terminal may generate large transient currents and high-frequency switching noise, easily leading to conducted and radiated emission risks. When conducting an electromagnetic compatibility risk assessment of the power amplifier output link, the focus should be on evaluating the power amplifier output path length, output wiring harness arrangement, high-current return path, power amplifier power supply decoupling structure, power amplifier heat dissipation and grounding structure, and the coupling relationship between the power amplifier output path and the return path.

[0056] In some implementations, the electromagnetic compatibility risk assessment of the power amplifier output link may include a conducted interference risk assessment of the high-current switching paths and the power amplifier output path within the power amplifier unit. For example, based on the power amplifier output current amplitude, power amplifier switching frequency, output path loop area, speaker harness length, output differential pair coupling degree, and power amplifier power supply return path, it can be determined whether the power amplifier output link is prone to conducted interference or radiates outwards through the speaker harness. If the assessment results indicate a high interference risk in the power amplifier output link, constraints such as shortening the power amplifier output path, using tightly coupled differential pair wiring, reducing the output loop area, strengthening power amplifier power supply decoupling, optimizing thermal grounding, or adding shielding measures can be determined in subsequent designs.

[0057] Here, the clock control link can include SOC clock, DSP clock, crystal, oscillator, phase-locked loop, audio sampling clock, and other clock sources related to audio processing and data transmission. The clock control link is a common source of high-frequency radiation in automotive power amplifier systems, and its fundamental frequency and harmonics may form significant radiation peaks during electromagnetic compatibility testing. Furthermore, in systems with dynamic sound effect adjustment capabilities, the audio processing unit may exhibit different processing states under different sound effect modes or algorithm loads, making the impact of the clock link on the overall electromagnetic emissions more complex. Therefore, when conducting an electromagnetic compatibility risk assessment of the clock control link, the focus should be on evaluating the clock frequency, clock trace length, clock source location, clock line proximity area, clock return path, and whether it possesses spread spectrum control capabilities.

[0058] In some implementations, the electromagnetic compatibility risk assessment of the clock control link may include evaluating the electromagnetic emission characteristics and adjustability of the main clock source. If the peak electromagnetic emission of the clock source is high, or if the clock trace is close to the sampling link, analog sampling terminal, or external connection terminal, it may lead to interference with the sampled signal or increased overall radiated emissions. To address this, constraints can be determined in subsequent design steps, such as prioritizing low electromagnetic emission clock devices, optimizing the clock source location, shortening clock traces, grounding clock lines, enabling spread spectrum functionality, or adjusting clock control parameters.

[0059] Here, based on the above electromagnetic compatibility risk assessment results, the electromagnetic compatibility constraints corresponding to each link can be determined. These electromagnetic compatibility constraints may include at least one of the following: device selection constraints, filter configuration constraints, wiring spacing constraints, area division constraints, grounding method constraints, shielding method constraints, clock control constraints, and software parameter variation constraints. Device selection constraints can be used to limit the low electromagnetic emission, high immunity, common-mode rejection capability, or power supply rejection capability requirements that devices such as SOCs, DSPs, sampling and acquisition operational amplifiers, crystals, oscillators, and power amplifier chips must meet. Filter configuration constraints can be used to limit the filter structure and filter location that need to be set in the sampling link, power amplifier power path, power amplifier output path, or clock power path.

[0060] Among these constraints, wiring spacing constraints can be used to limit the minimum isolation distance between sampling signal lines and high-speed digital signal lines, power amplifier output lines, high-current power lines, and clock lines, preventing high-noise links from causing coupling interference to sensitive sampling links. Area division constraints can be used to define the relative positions of analog sampling areas, digital processing areas, power amplifier current areas, and power supply areas on the circuit board. Grounding constraints can be used to define the ground plane configuration, single-point connection locations, power amplifier heat dissipation grounding paths, and return paths for sampling link reference grounds in different functional areas. Shielding constraints can be used to determine whether a metal shielding structure is required for the power amplifier module, the entire board, or specific high-radiation areas.

[0061] Furthermore, electromagnetic compatibility (EMC) constraints can also include constraints at the software control level. For example, for the clock control link, it can be determined whether to enable the spread spectrum function of the SOC or the main clock source, and the range of spread spectrum parameters; for the power amplifier output link, it can be determined the power amplifier gain change rate, gain jump limit, or gain gradation strategy to avoid transient radiation enhancement caused by instantaneous large changes in the power amplifier output current during dynamic sound effect adjustment. Thus, EMC constraints not only limit the hardware circuit and PCB design, but also constrain the way control parameters change in the dynamic sound effect adjustment algorithm.

[0062] S104. In accordance with the electromagnetic compatibility constraints, electromagnetic interference suppression measures are configured for the sampling link, digital processing link, power amplifier output link and clock control link respectively, so as to form a collaborative design scheme that meets the requirements of dynamic sound effect adjustment function and electromagnetic compatibility.

[0063] In practical implementation, after determining the electromagnetic compatibility (EMC) constraints for each link, EMC suppression measures are configured for the sampling link, digital processing link, power amplifier output link, and clock control link according to these constraints. This forms a collaborative design scheme that meets both dynamic sound effect adjustment and EMC requirements. This collaborative design scheme does not only target a single interference source for localized processing, but rather designs the sampling signal acquisition, audio feature analysis, power amplifier output drive, clock control, and PCB layout as an interconnected whole. This allows the vehicle-mounted power amplifier system to reduce the risk of EMC while achieving dynamic sound effect adjustment.

[0064] Here, for the acquisition link, electromagnetic interference suppression measures can be configured according to its characteristics as a sensitive analog signal path. Specifically, before the acquired signal enters the analog-to-digital converter of the audio processing unit, a filter circuit and a common-mode suppression device can be set on the acquisition signal path. The filter circuit can be used to filter out high-frequency interference introduced by power amplifier switching, high-speed digital signals, or power supply fluctuations; the common-mode suppression device can be used to suppress common-mode noise formed by the coupling of power amplifier output harness, speaker connection harness, or surrounding high-speed signals to the acquisition link.

[0065] In some embodiments, the filtering circuit may include a π-type filter circuit, and the common-mode suppression device may include a common-mode choke. The π-type filter circuit can be positioned near the analog-to-digital converter (ADC) end of the audio processing unit in the retrieval link, or it can be positioned at a predetermined location between the retrieval input end and the ADC end, depending on the location of the interference source. The common-mode choke can be positioned on the differential signal path of the retrieval signal to suppress common-mode interference components in the differential retrieval signal.

[0066] Furthermore, the sampling signal lines in the sampling link can be arranged using differential routing. Differential routing enables the sampling signal to have strong immunity to common-mode interference during transmission and can reduce the unbalanced coupling effect caused by external electromagnetic fields on the single-ended signal path. In PCB layout, the sampling signal lines can be kept away from high-speed digital signal lines, power amplifier output lines, high-current power lines, and main clock lines, maintaining a preset isolation distance. If necessary, reference ground protection traces or ground copper isolation areas can be set on both sides of the sampling signal lines to reduce crosstalk of adjacent noise paths to the sampling signal.

[0067] Here, for the digital processing link, electromagnetic interference suppression measures can be configured based on its high-speed switching and high-frequency data transmission characteristics. In the circuit board layout, the area containing the audio processing unit, DSP, SOC, memory interface, and high-speed digital bus can be divided into a digital processing area, and this digital processing area should be physically isolated from the analog sampling area. For the SOC clock line, DDR bus, audio data bus, and other high-speed digital signal lines, impedance control can be implemented to reduce signal reflection and edge overshoot; at the same time, grounding treatment or setting a continuous reference ground plane can be used to make the return path of high-speed signals as short and continuous as possible, thereby reducing the risk of radiated emissions caused by incomplete return paths.

[0068] In some implementations, a decoupling capacitor array can be placed near the power supply pins of the digital processing link. This array can include decoupling capacitors of varying capacitance values ​​to cover power supply noise suppression requirements across different frequency bands. For high-speed memory interfaces or high-speed data buses, equal-length or length-matched designs can be implemented based on wiring length, impedance continuity, and return path requirements, avoiding crossing the ground plane dividing line of the analog sampling area.

[0069] Here, for the power amplifier output link, electromagnetic interference suppression measures can be configured according to its high-current switching output characteristics. Specifically, the output path between the power amplifier unit and the speaker load can be shortened, and the power amplifier output path can be set as a tightly coupled differential pair wiring. By shortening the output path, the output loop area of ​​the power amplifier can be reduced, thus reducing magnetic field radiation caused by large current changes; by using tightly coupled differential pair wiring, the current return between the positive and negative paths of the power amplifier output can be made more compact, thereby reducing external radiation and interference coupling to the sampling link.

[0070] In some implementations, the power amplifier output link can also be equipped with output filtering components, power supply decoupling components, or ferrite beads and other suppression devices as needed to reduce the conduction of power amplifier switching noise along the speaker wiring harness or power path. The area where the power amplifier unit is located can be laid out independently as a power amplifier current amplification area, and reasonably separated from the analog sampling area, digital processing area, and power supply area. The return path of the power amplifier current amplification area can be arranged as close as possible to the power amplifier output path to reduce the area of ​​the high-current loop. For the power amplifier heat sink, power amplifier housing, or whole-board metal shielding, a low-impedance grounding path can be established to provide both heat dissipation and shielding, thereby reducing the electromagnetic energy radiated outward by the power amplifier module.

[0071] Here, for the clock control link, electromagnetic interference suppression measures can be configured based on its tendency to generate fundamental frequency and harmonic radiation peaks. Specifically, crystals, oscillators, or clock source devices with low electromagnetic emission characteristics can be prioritized, and the placement of the clock source on the PCB can be optimized to keep it away from the sampling link, external connection ports, and analog sampling terminals. For SOCs, DSPs, or other main clock lines, the clock trace length can be shortened, the reference ground can be kept continuous, and grounding can be used to reduce the risk of clock signals radiating outwards or coupling to the sampling link.

[0072] Furthermore, electromagnetic interference suppression can be implemented at the software control level for the clock control link. For example, the spread spectrum function of the audio processing unit and the main clock source can be enabled to disperse clock energy within a certain frequency range, thereby reducing the peak radiation corresponding to a single clock fundamental frequency and its harmonics. The spread spectrum function can be configured according to the operating status, sound effect mode, or electromagnetic compatibility test requirements of the vehicle amplifier system to reduce radiation peaks without affecting audio processing functions and system stability.

[0073] The dynamic sound effect adjustment algorithm can also be configured with dynamic gain management logic to constrain the amplifier gain change process. Specifically, when the audio processing unit obtains the target sound effect mode based on the backsampled signal and needs to adjust the amplifier gain, it can determine whether the change between the target gain and the current gain meets the preset change conditions. If the change is large, the amplifier gain can be adjusted using a gradual, segmented, or speed-limiting method, rather than causing a large jump in the amplifier gain within a very short time.

[0074] At the PCB layout level, the analog sampling area, digital processing area, power amplifier current area, and power supply area can be arranged in separate zones. The analog sampling area is used to arrange the sampling input terminals, signal conditioning circuits, filtering circuits, and analog-to-digital conversion input-related circuits; the digital processing area is used to arrange the SOC, DSP, memory interfaces, and high-speed digital signal lines; the power amplifier current area is used to arrange the power amplifier unit, power amplifier output path, and speaker connection terminals; and the power supply area is used to arrange the power conversion circuit, power amplifier power supply path, and related filtering components.

[0075] In terms of grounding design, corresponding ground planes can be set according to different functional areas, and these ground planes can be connected at a single point in a preset location. The analog sampling area can use a relatively quiet analog reference ground to ensure the stability of the sampling reference for the sampling signal; the digital processing area can be equipped with a digital ground plane to meet the high-speed digital signal return current requirements; the power amplifier current area can be equipped with a power ground or a high-current return path to carry the power amplifier output and power supply current. Connecting different ground planes at a single point can reduce interference from high-current or high-speed digital return currents to the analog sampling reference ground while ensuring reference potential consistency.

[0076] In terms of shielding design, based on the electromagnetic compatibility risk assessment results, metal shielding structures can be installed on the power amplifier unit, main clock source, high-speed digital processing area, or the entire board. These metal shielding structures can be connected to system ground or chassis ground via a low-impedance path to form a shielding and dissipation path for high-frequency radiated energy. For the power amplifier module, a low-impedance heat dissipation grounding path can also be established in conjunction with the heat dissipation structure, so that the heat dissipation structure not only serves for heat conduction but also for suppressing electromagnetic radiation generated by the power amplifier unit.

[0077] Therefore, by configuring filtering, common-mode rejection, differential routing, and isolation measures for the sampling link; by configuring impedance control, grounding, area isolation, and power decoupling measures for the digital processing link; by configuring short-path, tightly coupled differential routing, output filtering, shielding, and low-impedance grounding measures for the power amplifier output link; and by configuring low-radiation device selection, clock line optimization, and software spread spectrum measures for the clock control link, an electromagnetic compatibility (EMC) collaborative design scheme for the dynamic sound effect adjustment function of the vehicle power amplifier system can be formed. This collaborative design scheme can balance the accuracy of the sampling signal, the real-time performance of sound effect adjustment, and the overall EMC performance, enabling the vehicle power amplifier system to maintain good working stability in different sound effect modes and during dynamic adjustment.

[0078] S105. The collaborative design scheme is simulated and tested, and the electromagnetic interference suppression measures and dynamic sound effect adjustment parameters are adjusted according to the simulation verification results and prototype test results until the vehicle power amplifier system meets the functional design goals and the electromagnetic compatibility design goals.

[0079] In practical implementation, after configuring the electromagnetic compatibility (EMC) collaborative design scheme for the vehicle-mounted power amplifier system, the collaborative design scheme is simulated and tested to ensure that the system meets EMC requirements while achieving dynamic sound effect adjustment. Simulation verification may include signal integrity simulation, power integrity simulation, and electromagnetic radiation simulation.

[0080] Among them, signal integrity simulation is used to evaluate whether there is distortion, reflection or crosstalk in the high-speed data transmission or analog signal sampling process of the sampling link and digital processing link; power integrity simulation is used to evaluate the stability and transient response of the power supply network of the power amplifier output link and digital processing link; electromagnetic radiation simulation is used to predict the radiated emission of the whole board and key links under different sound effect modes, and identify potential over-standard points or radiation hotspots.

[0081] Here, during the prototype testing phase, a prototype of the in-vehicle power amplifier system conforming to the collaborative design scheme is manufactured, and near-field scanning and far-field electromagnetic compatibility (EMC) testing are performed under different sound effect modes. Near-field scanning can use probes to scan along the sampling link, power amplifier output link, and key PCB areas to quickly locate local radiated hotspots and interference sources; far-field testing can be performed in a standard EMC laboratory environment, according to automotive-grade EMC testing standards, to conduct full-item verification, including radiated emission testing, conducted emission testing, and immunity testing.

[0082] When simulation verification or prototype testing results show that certain links or modules have excessive electromagnetic interference, signal distortion, or inaccurate audio adjustment, the electromagnetic interference suppression measures for the corresponding links can be adjusted based on the test results. For example, the filter circuit parameters or common-mode suppression device specifications of the sampling link can be adjusted, and the differential trace spacing and isolation arrangement of the sampling signal can be optimized; the impedance matching, grounding treatment, or high-speed bus routing of the digital processing link can be adjusted; the differential pair coupling tightness, output filter components, or shielding structure of the power amplifier output link can be adjusted; and the spread spectrum parameters of the clock control link can be enabled or adjusted to reduce peak radiation.

[0083] Simultaneously, based on the analysis results of the re-sampled signal and audio output, dynamic adjustment parameters for audio effects can be adjusted, such as equalizer parameters, dynamic range control parameters, amplifier gain parameters, or other audio effect algorithm parameters. Adjustment strategies can include gradual gain control, dynamic gain limiting, or segmented parameter updates to ensure that the re-sampled signal remains stable during audio effect mode switching or rapid response, that the accuracy of audio effect mode recognition is not disturbed, and to avoid radiation peaks caused by transient changes in amplifier output.

[0084] In this way, through the above simulation verification and prototype testing, and iterative adjustments based on the test results, the vehicle power amplifier system meets the preset sound effect dynamic adjustment function target and electromagnetic compatibility design target in various sound effect modes and dynamic adjustment scenarios. This achieves a closed-loop design of hardware and software co-optimization, thereby ensuring the system has stability, reliability and a good user listening experience in complex electromagnetic environments.

[0085] This disclosure provides an electromagnetic compatibility (EMC) method based on dynamic adjustment of power amplifier audio effects. This method enables dynamic adjustment of audio effects in an in-vehicle power amplifier system based on the retrieval signal. Simultaneously, it reduces the risk of electromagnetic interference between the retrieval link, high-speed digital link, and power amplifier output link from the design stage, improves the purity of the retrieval signal and the accuracy of audio effect pattern recognition, and reduces the risk of EMC exceeding standards caused by changes in power amplifier gain or clock radiation during dynamic adjustment. This enhances the stability and reliability of the in-vehicle power amplifier system in complex electromagnetic environments and improves its efficiency in passing automotive-grade EMC tests.

[0086] Those skilled in the art will understand that, in the above-described method of the specific implementation, the order in which each step is written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0087] Based on the same inventive concept, this disclosure also provides an electromagnetic compatibility device based on dynamic adjustment of power amplifier sound effects, corresponding to the electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects. Since the principle of the device in this disclosure for solving the problem is similar to the electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects described above in this disclosure, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0088] Please see Figure 2 , Figure 2 This is a schematic diagram of an electromagnetic compatibility device based on dynamic adjustment of power amplifier sound effects, provided as an embodiment of this disclosure. Figure 2 As shown in the figure, the electromagnetic compatibility device 200 based on dynamic adjustment of power amplifier sound effects provided in this embodiment includes: The design goal determination module 210 is used to determine the functional design goals corresponding to the dynamic sound effect adjustment function and the electromagnetic compatibility design goals corresponding to the vehicle power amplifier system during the development stage of the vehicle power amplifier system.

[0089] The system architecture module 220 is used to construct a dynamic sound effect adjustment system architecture, including a sampling link, an audio processing unit, a power amplifier unit, and a speaker load, based on the aforementioned functional design objectives.

[0090] The risk assessment module 230 is used to conduct an electromagnetic compatibility risk assessment on the sampling link, digital processing link, power amplifier output link and clock control link in the audio dynamic adjustment system architecture based on the electromagnetic compatibility design objectives, and to determine the corresponding electromagnetic compatibility constraints based on the assessment results.

[0091] The scheme output module 240 is used to configure electromagnetic interference suppression measures for the sampling link, digital processing link, power amplifier output link and clock control link respectively according to the electromagnetic compatibility constraints, so as to form a collaborative design scheme that meets the requirements of dynamic sound effect adjustment function and electromagnetic compatibility.

[0092] The test adjustment module 250 is used to perform simulation verification and prototype testing on the collaborative design scheme, and to adjust the electromagnetic interference suppression measures and dynamic sound effect adjustment parameters according to the simulation verification results and prototype test results, until the vehicle power amplifier system meets the functional design goals and the electromagnetic compatibility design goals.

[0093] The processing flow of each module in the device and the interaction flow between each module can be referred to the relevant descriptions in the above method embodiments, and will not be detailed here.

[0094] This disclosure provides an electromagnetic compatibility (EMC) device based on dynamic adjustment of power amplifier audio effects. This device enables dynamic adjustment of audio effects in an in-vehicle power amplifier system based on the retrieval signal. Simultaneously, it reduces the risk of electromagnetic interference between the retrieval link, high-speed digital link, and power amplifier output link from the design stage, improves the purity of the retrieval signal and the accuracy of audio effect pattern recognition, and reduces the risk of EMC exceeding standards caused by changes in power amplifier gain or clock radiation during dynamic adjustment. This enhances the stability and reliability of the in-vehicle power amplifier system in complex electromagnetic environments and improves its efficiency in passing automotive-grade EMC tests.

[0095] Corresponding to Figure 1 The electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects in this disclosure also provides an electronic device 300, such as... Figure 3 The diagram shown is a structural schematic of an electronic device 300 provided in an embodiment of this disclosure, including: Processor 31, memory 32, and bus 33; memory 32 is used to store execution instructions, including main memory 321 and external memory 322; the main memory 321, also called internal memory, is used to temporarily store the computational data in processor 31, as well as the data exchanged with external memory 322 such as hard disk. Processor 31 exchanges data with external memory 322 through main memory 321. When the electronic device 300 is running, processor 31 and memory 32 communicate through bus 33, enabling processor 31 to execute... Figure 1 The steps of the electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects.

[0096] This disclosure also provides a computer-readable storage medium storing a computer program. When executed by a processor, the computer program performs the steps of the electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects described in the above-described method embodiments. The storage medium can be a volatile or non-volatile computer-readable storage medium.

[0097] This disclosure also provides a computer program product, which includes computer instructions. When the computer instructions are executed by a processor, they can perform the steps of the electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects described in the above method embodiments. For details, please refer to the above method embodiments, which will not be repeated here.

[0098] The aforementioned computer program product can be implemented through hardware, software, or a combination thereof. In one optional embodiment, the computer program product is specifically embodied in a computer storage medium; in another optional embodiment, the computer program product is specifically embodied in a software product, such as a software development kit (SDK), etc.

[0099] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the device described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here. In the several embodiments provided in this disclosure, it should be understood that the disclosed device and method can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. Furthermore, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the displayed or discussed mutual coupling or direct coupling or communication connection may be through some communication interfaces; the indirect coupling or communication connection of devices or units may be electrical, mechanical, or other forms.

[0100] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0101] In addition, the functional units in the various embodiments of this disclosure can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0102] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this disclosure, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this disclosure. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0103] Finally, it should be noted that the above-described embodiments are merely specific implementations of this disclosure, used to illustrate the technical solutions of this disclosure, and not to limit it. The protection scope of this disclosure is not limited thereto. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the scope of the technology disclosed in this disclosure. Such modifications, changes, 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 disclosure, and should all be covered within the protection scope of this disclosure. Therefore, the protection scope of this disclosure should be determined by the protection scope of the claims.

Claims

1. An electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects, characterized in that, include: During the development phase of the vehicle amplifier system, the functional design goals corresponding to the dynamic sound effect adjustment function and the electromagnetic compatibility design goals corresponding to the vehicle amplifier system are determined. Based on the aforementioned functional design goals, a dynamic sound effect adjustment system architecture is constructed, comprising a retrieval link, an audio processing unit, a power amplifier unit, and a speaker load. Based on the electromagnetic compatibility design objectives, an electromagnetic compatibility risk assessment is conducted on the retrieval link, digital processing link, power amplifier output link, and clock control link in the audio effect dynamic adjustment system architecture, and the corresponding electromagnetic compatibility constraints are determined based on the assessment results. According to the electromagnetic compatibility constraints, electromagnetic interference suppression measures are configured for the sampling link, digital processing link, power amplifier output link and clock control link respectively, so as to form a collaborative design scheme that meets the requirements of dynamic sound effect adjustment function and electromagnetic compatibility. The collaborative design scheme is simulated and tested, and the electromagnetic interference suppression measures and dynamic sound effect adjustment parameters are adjusted according to the simulation and test results until the vehicle power amplifier system meets the functional design goals and the electromagnetic compatibility design goals.

2. The method according to claim 1, characterized in that, The functional design goals for the dynamic sound effect adjustment function and the electromagnetic compatibility design goals for the vehicle amplifier system are determined, specifically including: At least one of the following is determined as the functional design objective: sound effect pattern recognition accuracy, sound effect adjustment response time, and the number of supported sound effect patterns; The electromagnetic compatibility design objective is determined as at least one of the radiated emission requirements, conducted emission requirements, and immunity requirements that the vehicle power amplifier system needs to meet. Based on different audio source content and different vehicle operating environments, corresponding audio effect mode feature models are established.

3. The method according to claim 1, characterized in that, Based on the aforementioned functional design goals, a dynamic sound effect adjustment system architecture is constructed, comprising a retrieval link, an audio processing unit, a power amplifier unit, and a speaker load, including: The power amplifier output signal is sampled back to the audio processing unit via the sampling link; The audio processing unit performs feature analysis on the re-sampled signal and matches the corresponding sound effect mode based on the feature analysis results; The digital signal processing parameters and power amplifier gain parameters are adjusted according to the matched sound effect mode in order to dynamically adjust the output sound effect of the speaker load.

4. The method according to claim 1, characterized in that, An electromagnetic compatibility risk assessment was conducted on the retrieval link, digital processing link, power amplifier output link, and clock control link in the aforementioned dynamic sound effect adjustment system architecture, specifically including: The common-mode rejection capability and power supply rejection capability of the analog mining devices in the mining link are evaluated. An electromagnetic emission risk assessment was conducted on the high-speed digital processing devices, memory interface, and clock source in the audio processing unit. Conducted interference risk assessment is performed on the high-current switching path and power amplifier output path in the power amplifier unit; Based on the electromagnetic compatibility risk assessment results, at least one electromagnetic compatibility constraint is determined from among device selection, filter configuration, wiring spacing, grounding method, and shielding method.

5. The method according to claim 1, characterized in that, Electromagnetic interference suppression measures are configured for the aforementioned data acquisition link, including: A filtering circuit and a common-mode suppression device are provided before the sampled signal enters the analog-to-digital conversion terminal of the audio processing unit; The filtering circuit includes a π-type filtering circuit, and the common-mode suppression device includes a common-mode choke. The π-type filtering circuit is used to filter out power amplifier switching noise and high-frequency interference, and the common-mode choke is used to suppress common-mode interference in the acquisition link to improve the signal purity of the acquired signal. Configure the mining signal line in the mining link as a differential routing line; The sampling signal line is kept at a preset isolation distance from the high-speed digital signal line, power amplifier output line and high-current power supply line.

6. The method according to claim 1, characterized in that, Electromagnetic interference suppression measures are configured for the digital processing link and the power amplifier output link, including: The circuit board layout is divided into analog sampling area, digital processing area, power amplification current area and power supply area. Set up corresponding ground planes for different areas, and connect the different ground planes at preset locations; Impedance control and grounding processing are applied to the clock lines and high-speed buses in the digital processing link. Shorten the output path between the power amplifier unit and the speaker load, and set the power amplifier output path to a tightly coupled differential pair wiring.

7. The method according to claim 1, characterized in that, Electromagnetic interference suppression measures are configured for the clock control link, including: Enable the spread spectrum function of the audio processing unit and the main clock source to reduce the peak radiation corresponding to the clock base frequency; Dynamic gain management logic is set in the sound effect dynamic adjustment algorithm so that the power amplifier gain is adjusted gradually when the preset change conditions are met, so as to reduce transient electromagnetic radiation caused by transient changes in the power amplifier output current.

8. The method according to claim 1, characterized in that, The collaborative design scheme is subjected to simulation verification and prototype testing, specifically including: Before the circuit board is manufactured, signal integrity simulation is performed on the quality of the back-sampling signal, power integrity simulation is performed on the stability of the power network, and electromagnetic radiation simulation is performed on the overall radiated emission of the board. If the simulation results do not meet the preset requirements, return to adjust the electromagnetic interference suppression measures; After the prototype was completed, the vehicle-mounted power amplifier system was run in different sound effect modes to conduct near-field scanning and far-field electromagnetic compatibility tests. When the prototype test results do not meet the electromagnetic compatibility design goals, the hardware electromagnetic compatibility design and software control parameters are adjusted based on the test results.

9. An electromagnetic compatibility device based on dynamic adjustment of power amplifier sound effects, characterized in that, include: The design goal determination module is used to determine the functional design goals corresponding to the dynamic sound effect adjustment function and the electromagnetic compatibility design goals corresponding to the vehicle amplifier system during the development stage of the vehicle amplifier system. The system architecture module is used to construct a dynamic sound effect adjustment system architecture, including a retrieval link, an audio processing unit, a power amplifier unit, and a speaker load, based on the aforementioned functional design objectives. The risk assessment module is used to conduct electromagnetic compatibility risk assessments on the retrieval link, digital processing link, power amplifier output link, and clock control link in the audio dynamic adjustment system architecture based on the electromagnetic compatibility design objectives, and to determine the corresponding electromagnetic compatibility constraints based on the assessment results. The scheme output module is used to configure electromagnetic interference suppression measures for the sampling link, digital processing link, power amplifier output link and clock control link respectively according to the electromagnetic compatibility constraints, so as to form a collaborative design scheme that meets the requirements of dynamic sound effect adjustment function and electromagnetic compatibility. The test and adjustment module is used to perform simulation verification and prototype testing on the collaborative design scheme, and to adjust the electromagnetic interference suppression measures and dynamic sound effect adjustment parameters according to the simulation verification results and prototype test results, until the vehicle power amplifier system meets the functional design goals and the electromagnetic compatibility design goals.

10. An electronic device, characterized in that, include: The device includes a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When the electronic device is running, the processor communicates with the memory via the bus. When the machine-readable instructions are executed by the processor, they perform the steps of the electromagnetic compatibility method based on dynamic adjustment of power amplifier sound effects as described in any one of claims 1 to 8.

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