Audio dynamic phase adjustment apparatus, method, and vehicle

Abstract

This invention relates to the field of vehicle audio system technology, and discloses an audio dynamic phase adjustment device, method, and vehicle. The device includes: a DSP amplifier module configured to emit raw audio signals to vehicle speakers; and a frequency domain analysis module connected to the DSP amplifier module, configured to detect whether vibration occurs in the vehicle body sheet metal structure. If vibration occurs, dynamic phase adjustment is performed. The dynamic phase adjustment includes: determining a phase superposition frequency band based on the vibration spectrum of the vehicle body sheet metal structure, the reflected wave spectrum of the in-vehicle sound field, and the raw direct-output sound wave spectrum, and sending a phase control signal to the DSP amplifier module to control the DSP amplifier module to perform phase reversal on the phase superposition frequency band of the raw direct-output sound wave spectrum. This invention solves the problem of low-frequency humming caused by resonance of vehicle speakers, vehicle body sheet metal structure, and interior components in the prior art.

Description

Technical Field

[0001] This invention relates to the field of vehicle audio system technology, specifically to an audio dynamic phase adjustment device, method, and vehicle. Background Technology

[0002] With the upgrading of automobile consumption and the continuous improvement of users' driving experience demands, in-vehicle speaker systems have evolved from traditional auxiliary configurations to important components affecting overall vehicle quality and driving experience. Consumers are paying significantly more attention to the sound quality, sound field reproduction, and low-frequency texture of the speakers in audio systems. However, due to inherent limitations such as the small and irregular enclosed acoustic space inside the vehicle, the characteristics of the body sheet metal structure, the assembly gaps of interior parts, and multi-interface coupling resonance, when the speakers of the in-vehicle audio system are working, especially when the bass energy is strong, they are prone to exciting resonance in the body sheet metal structure such as the doors and roof, as well as interior parts, during the sound emission process, thus causing low-frequency humming. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this application is to provide an audio dynamic phase adjustment device, method and vehicle, which aims to solve the problem of low-frequency humming caused by resonance of vehicle speakers, body sheet metal structure and interior parts in the prior art.

[0004] In a first aspect, embodiments of this application provide an audio dynamic phase adjustment device, comprising:

[0005] The DSP amplifier module is configured to output raw audio signals to the vehicle speakers.

[0006] And a frequency domain analysis module, which is signal-connected to the DSP power amplifier module, is configured to: detect whether the body sheet metal structure is vibrating; if vibration occurs, perform dynamic audio phase adjustment. The dynamic audio phase adjustment includes: determining the phase superposition frequency band after frequency domain analysis based on the vibration spectrum of the body sheet metal structure, the reflected wave spectrum of the in-vehicle sound field, and the original direct output sound wave spectrum; and sending a phase control signal to the DSP power amplifier module to control the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct output sound wave spectrum.

[0007] This setup, through frequency domain analysis and comparison of the vibration spectrum of the vehicle body sheet metal structure, the reflected wave spectrum of the in-vehicle sound field, and the original direct output sound wave spectrum, identifies the phase superposition frequency band. Simultaneously, it controls the DSP power amplifier module to adjust the phase of this frequency band by performing a 180° phase reversal, thereby interrupting the generation of vibration and eliminating the low-frequency humming problem caused by the phase superposition of resonant sound waves, reflected sound waves, and direct output sound waves from the speakers. Furthermore, this phase reversal only adjusts the phase of the target frequency band, without attenuating the audio amplitude or superimposing additional sound waves. While suppressing low-frequency humming, it can also relatively completely preserve the bass extension depth and stereo imaging, thereby reducing the vibration amplitude of the sheet metal and balancing the high-fidelity acoustic performance of the in-vehicle speakers with the NVH performance of the entire vehicle interior.

[0008] In one possible embodiment, determining whether the body sheet metal is experiencing vibration specifically includes:

[0009] Obtain the excitation signal of the body sheet metal structure, and determine the excitation spectrum of the body sheet metal structure based on the excitation signal;

[0010] Frequency domain analysis is performed on the excitation spectrum of the body sheet metal structure. If the amplitude is greater than the first threshold and the duration exceeds the second threshold, it is determined that the body sheet metal structure is experiencing excitation.

[0011] With this setup, the frequency domain analysis module performs FFT or bandpass filtering on the excitation signal of the vehicle body sheet metal structure detected by the vibration sensor, extracting the amplitude and frequency of its frequency bands. Subsequently, a threshold determination is performed; if the energy of a certain frequency band is significantly higher than the set threshold, it is determined that the vehicle body sheet metal structure is experiencing excitation. By combining amplitude and duration to compare the excitation signal against thresholds, invalid signals such as instantaneous stray vibrations, random noise, and short-term interference during vehicle operation can be effectively filtered out, preventing system misjudgment and significantly improving the accuracy of resonance identification and the stability of system operation.

[0012] In one possible embodiment, the audio dynamic phase adjustment specifically includes:

[0013] The frequency band in which the amplitude of the excitation spectrum of the body sheet metal structure is greater than the first threshold and the duration exceeds the second threshold is determined as the target resonance frequency band;

[0014] Acquire in-vehicle sound field audio signal and original audio signal; determine in-vehicle sound field reflected wave spectrum based on in-vehicle sound field audio signal; determine original direct output sound wave spectrum based on original audio signal.

[0015] By comparing the target resonance frequency band, the in-vehicle sound field reflected wave spectrum, and the original direct output sound wave spectrum with the frequency domain analysis, it is found that there is a phase superposition frequency band. If a phase superposition frequency band exists, a phase control signal is sent to the DSP power amplifier module to control the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct output sound wave spectrum.

[0016] This setup allows for the following: By performing frequency domain analysis and comparison of the vibration spectrum of the vehicle body sheet metal structure, the reflected wave spectrum of the in-vehicle sound field, and the original direct-output sound wave spectrum, the phase superposition frequency band is identified. Simultaneously, the DSP power amplifier module is controlled to adjust the phase of this frequency band by performing a 180° phase reversal, thereby interrupting the generation of vibration and eliminating the low-frequency humming problem caused by the phase superposition of resonant sound waves, reflected sound waves, and direct-output sound waves from the speakers. Furthermore, this phase reversal only adjusts the phase of the target frequency band, without attenuating the audio amplitude or superimposing additional sound waves. While suppressing low-frequency humming, it can also relatively completely preserve the bass extension depth and stereo imaging, thereby reducing the vibration amplitude of the sheet metal and balancing the high-fidelity acoustic performance of the in-vehicle speakers with the NVH performance of the entire vehicle interior.

[0017] In one possible embodiment, the device further includes a vibration detection module, which is signal-connected to the frequency domain analysis module, and the vibration detection module is configured to: acquire excitation signals of the body sheet metal structure.

[0018] With this setup, the vibration detection module can collect the excitation signal of the body sheet metal structure, directly obtaining the specific situation of the vibration of the body sheet metal, providing real and effective raw data support for subsequent frequency domain analysis and phase superposition determination.

[0019] In one possible embodiment, the device further includes an audio acquisition module, which is signal-connected to the frequency domain analysis module, and the audio acquisition module is configured to acquire in-vehicle sound field audio signals.

[0020] With this setup, the audio acquisition module can collect the in-vehicle sound field audio signal, directly obtaining the specific situation of the reflected sound field of the vehicle's interior, providing real and effective raw data support for subsequent frequency domain analysis and phase superposition determination.

[0021] In one possible embodiment, the vibration detection module includes multiple vibration sensors, which are respectively arranged in each door of the vehicle and each side panel of the vehicle body; the audio acquisition module is a microphone installed in the headrest of the vehicle seat.

[0022] With this setup, multiple vibration sensors are placed in sheet metal areas prone to low-frequency resonance, such as the doors and side panels of the vehicle. The microphones built into the headrests are positioned close to the human ear's hearing position. The detection data from this layout closely matches the real driving experience, avoiding regional bias caused by single-point detection, and further improving the system's resonance recognition accuracy and the actual driving optimization effect of phase control.

[0023] Secondly, this application provides an audio dynamic phase adjustment method, including:

[0024] Check if there is vibration in the body sheet metal structure. If vibration is found, perform dynamic phase adjustment of the audio.

[0025] The audio dynamic phase adjustment includes: determining the phase superposition frequency band based on the excitation spectrum of the vehicle body sheet metal structure, the spectrum of reflected waves in the in-vehicle sound field, and the original direct output sound wave spectrum, and sending a phase control signal to the DSP power amplifier module to control the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct output sound wave spectrum.

[0026] This setup, through frequency domain analysis and comparison of the vibration spectrum of the vehicle body sheet metal structure, the reflected wave spectrum of the in-vehicle sound field, and the original direct output sound wave spectrum, identifies the phase superposition frequency band. Simultaneously, it controls the DSP power amplifier module to adjust the phase of this frequency band by performing a 180° phase reversal, thereby interrupting the generation of vibration and eliminating the low-frequency humming problem caused by the phase superposition of resonant sound waves, reflected sound waves, and direct output sound waves from the speakers. Furthermore, this phase reversal only adjusts the phase of the target frequency band, without attenuating the audio amplitude or superimposing additional sound waves. While suppressing low-frequency humming, it can also relatively completely preserve the bass extension depth and stereo imaging, thereby reducing the vibration amplitude of the sheet metal and balancing the high-fidelity acoustic performance of the in-vehicle speakers with the NVH performance of the entire vehicle interior.

[0027] In one possible embodiment, determining whether the body sheet metal is experiencing vibration specifically includes:

[0028] Obtain the excitation signal of the body sheet metal structure, and determine the excitation spectrum of the body sheet metal structure based on the excitation signal;

[0029] Frequency domain analysis is performed on the excitation spectrum of the body sheet metal structure. If the amplitude is greater than the first threshold and the duration exceeds the second threshold, it is determined that the body sheet metal structure is experiencing excitation.

[0030] With this setup, the frequency domain analysis module performs FFT or bandpass filtering on the excitation signal of the vehicle body sheet metal structure detected by the vibration sensor, extracting the amplitude and frequency of its frequency bands. Subsequently, a threshold determination is performed; if the energy of a certain frequency band is significantly higher than the set threshold, it is determined that the vehicle body sheet metal structure is experiencing excitation. By combining amplitude and duration to compare the excitation signal against thresholds, invalid signals such as instantaneous stray vibrations, random noise, and short-term interference during vehicle operation can be effectively filtered out, preventing system misjudgment and significantly improving the accuracy of resonance identification and the stability of system operation.

[0031] In one possible embodiment, the audio dynamic phase adjustment specifically includes:

[0032] The frequency band in which the amplitude of the excitation spectrum of the body sheet metal structure is greater than the first threshold and the duration exceeds the second threshold is determined as the target resonance frequency band;

[0033] Acquire in-vehicle sound field audio signal and original audio signal; determine in-vehicle sound field reflected wave spectrum based on in-vehicle sound field audio signal; determine original direct output sound wave spectrum based on original audio signal.

[0034] By comparing the target resonance frequency band, the in-vehicle sound field reflected wave spectrum, and the original direct output sound wave spectrum with the frequency domain analysis, it is found that there is a phase superposition frequency band. If a phase superposition frequency band exists, a phase control signal is sent to the DSP power amplifier module to control the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct output sound wave spectrum.

[0035] Thirdly, this application provides a vehicle including the aforementioned audio dynamic phase adjustment device.

[0036] The beneficial effects of this application are as follows: This application analyzes and compares the frequency domain spectrum of the excitation spectrum of the body sheet metal structure, the spectrum of the reflected wave of the in-vehicle sound field, and the spectrum of the original direct output sound wave to find the phase superposition frequency band. At the same time, it controls the DSP power amplifier module to adjust the phase of this frequency band to perform a 180° phase reversal, thereby interrupting the generation of excitation and eliminating the low-frequency humming problem caused by the phase superposition of resonant sound waves, reflected sound waves, and direct output sound waves from the speaker. Moreover, this phase reversal only adjusts the phase of the target frequency band, without attenuating the audio amplitude or superimposing additional sound waves. While suppressing low-frequency humming, it can also preserve the bass depth and stereo imaging relatively completely, thereby reducing the vibration amplitude of the sheet metal and taking into account both the high-fidelity acoustic performance of the in-vehicle speakers and the NVH performance of the entire vehicle interior. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application will be described below.

[0038] Figure 1This is a schematic diagram of the architecture of the audio dynamic phase adjustment device disclosed in the embodiments of this application;

[0039] Figure 2 This is a flowchart illustrating the audio dynamic phase adjustment method disclosed in an embodiment of this application. Detailed Implementation

[0040] The term "signal connection" refers to the ability of current or signal to flow from one conductor to another. A signal connection between A and B means that current or signal can flow from A to B, and vice versa. This includes both direct and indirect signal connections between A and B.

[0041] The embodiments of this application are described below with reference to the accompanying drawings.

[0042] Example 1:

[0043] The vehicles disclosed in this application can be, but are not limited to, pure electric vehicles (PEV / BEV), hybrid electric vehicles (HEV), range-extended electric vehicles (REEV), plug-in hybrid electric vehicles (PHEV), and new energy vehicles. In this application's embodiments, the vehicle includes an audio dynamic phase adjustment device.

[0044] Please see Figure 1 , Figure 1 This is a schematic diagram of the architecture of the audio dynamic phase adjustment device disclosed in an embodiment of this application. The audio dynamic phase adjustment device includes a DSP power amplifier module, a vibration detection module, an audio acquisition module, and a frequency domain analysis module.

[0045] The DSP amplifier module is configured to output raw audio signals to the vehicle speakers. Here, DSP stands for Digital Signal Processing Module.

[0046] The vibration detection module is configured to collect vibration signals from the vehicle's sheet metal structure. The vibration detection module includes multiple vibration sensors, which are respectively located in each door and side panel of the vehicle.

[0047] The audio acquisition module is configured to acquire in-vehicle sound field audio signals. The audio acquisition module is a microphone installed in the headrest of the vehicle seat.

[0048] The frequency domain analysis module is connected to the DSP power amplifier module, vibration detection module, and audio acquisition module respectively. The frequency domain analysis module is configured to detect whether the body sheet metal structure is vibrating. If vibration occurs, dynamic audio phase adjustment is performed. The dynamic audio phase adjustment includes determining the phase superposition frequency band after frequency domain analysis based on the vibration spectrum of the body sheet metal structure, the reflected wave spectrum of the in-vehicle sound field, and the original direct output sound wave spectrum. A phase control signal is sent to the DSP power amplifier module to control the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct output sound wave spectrum.

[0049] Specifically, the frequency domain analysis module is configured to: acquire the excitation signal of the body sheet metal structure, and determine the excitation spectrum of the body sheet metal structure based on the excitation signal; specifically, after the vibration detection module acquires the excitation signal of the body sheet metal structure, it sends the excitation signal of the body sheet metal structure to the frequency domain analysis module so that the frequency domain analysis module can acquire the excitation signal of the body sheet metal structure; the frequency domain analysis module converts the time-domain vibration of the body sheet metal structure excitation signal into the frequency domain spectrum through FFT (fast Fourier transform). Optionally, the frequency domain analysis module is configured with an FIR (finite impulse response) or IIR (infinite impulse response) bandpass filter to filter out irrelevant noise;

[0050] Frequency domain analysis is performed on the excitation spectrum of the body sheet metal structure. If the amplitude is greater than a first threshold and the duration exceeds a second threshold, it is determined that the body sheet metal structure is experiencing excitation. The frequency bands in which the amplitude of the excitation spectrum of the body sheet metal structure is greater than the first threshold and the duration exceeds the second threshold are determined as the target resonance frequency bands. Specifically, the frequency domain analysis module divides the amplitude of the excitation spectrum of the body sheet metal structure into two types: greater than the first threshold and not greater than the first threshold. If the amplitude of a certain frequency band is greater than the first threshold and the duration exceeds the second threshold, it is determined that the body sheet metal structure is experiencing excitation and that frequency band is determined as the target resonance frequency band.

[0051] The system acquires the in-vehicle sound field audio signal and the original audio signal. Based on the in-vehicle sound field audio signal, it determines the reflected wave spectrum of the in-vehicle sound field and the original direct output sound wave spectrum based on the original audio signal. Specifically, after the audio acquisition module acquires the in-vehicle sound field audio signal, it sends the in-vehicle sound field audio signal to the frequency domain analysis module to enable the frequency domain analysis module to acquire the in-vehicle sound field audio signal. The DSP power amplifier module sends the original audio signal to the frequency domain analysis module to enable the frequency domain analysis module to acquire the original audio signal. The frequency domain analysis module converts the audio waveforms of the in-vehicle sound field audio signal and the original audio signal into a frequency domain spectrum through FFT (fast Fourier transform). Optionally, the frequency domain analysis module is configured with an FIR (finite impulse response) or IIR (infinite impulse response) bandpass filter to filter out irrelevant noise.

[0052] By comparing the target resonant frequency band, the in-vehicle sound field reflected wave spectrum, and the original direct-output sound wave spectrum using frequency domain analysis, a phase superposition frequency band is identified. If a phase superposition frequency band exists, a phase control signal is sent to the DSP power amplifier module to control the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct-output sound wave spectrum. Frequency domain analysis comparison refers to the frequency domain analysis module comparing the phase of the target resonant frequency band with the in-vehicle sound field reflected wave spectrum and the original direct-output sound wave spectrum to identify frequency bands with overlapping phases and superimposed energy, which are the phase superposition frequency bands. Controlling the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct-output sound wave spectrum means flipping the waveform of the corresponding phase superposition frequency band of the original direct-output sound wave spectrum by 180°, making the peaks of this waveform become troughs and the troughs become peaks, achieving a phase difference of 180 degrees, while the waveforms of the remaining frequency bands (non-phase superposition frequency bands) of the original direct-output sound wave spectrum remain unchanged.

[0053] This application embodiment analyzes and compares the excitation spectrum of the vehicle body sheet metal structure, the spectrum of reflected waves in the in-vehicle sound field, and the spectrum of the original direct output sound wave in the frequency domain to find the phase superposition frequency band. At the same time, it controls the DSP power amplifier module to adjust the phase of this frequency band to perform a 180° phase reversal, thereby interrupting the generation of excitation and eliminating the low-frequency humming problem caused by the phase superposition of resonant sound waves, reflected sound waves, and direct output sound waves from the speaker. Moreover, this phase reversal only adjusts the phase of the target frequency band, without attenuating the audio amplitude or superimposing additional sound waves. While suppressing low-frequency humming, it can also preserve the bass depth and stereo imaging relatively completely, thereby reducing the vibration amplitude of the sheet metal and taking into account both the high-fidelity acoustic performance of the vehicle speakers and the NVH performance of the entire vehicle interior.

[0054] Furthermore, the frequency domain analysis module in this embodiment performs FFT or bandpass filtering on the excitation signal of the vehicle body sheet metal structure detected by the vibration sensor to extract the amplitude and frequency of its frequency band. Subsequently, a threshold determination is performed; if the energy of a certain frequency band is significantly higher than the set threshold, it is determined that the vehicle body sheet metal structure is experiencing excitation. By combining amplitude and duration to compare the excitation signal against a threshold, invalid signals such as instantaneous stray vibrations, random noise, and short-term interference during vehicle operation can be effectively filtered out, preventing system misjudgment and significantly improving the accuracy of resonance identification and the stability of system operation.

[0055] Example 2:

[0056] Please see Figure 2 , Figure 2 This is a flowchart illustrating the audio dynamic phase adjustment method disclosed in an embodiment of this application. The audio dynamic phase adjustment method includes the following steps:

[0057] S1. Check if there is vibration in the body sheet metal structure. If vibration is detected, proceed to step S2.

[0058] Step S1 specifically includes: S101, acquiring the excitation signal of the body sheet metal structure, and determining the excitation spectrum of the body sheet metal structure based on the excitation signal; specifically, after the vibration detection module acquires the excitation signal of the body sheet metal structure, it sends the excitation signal of the body sheet metal structure to the frequency domain analysis module so that the frequency domain analysis module can acquire the excitation signal of the body sheet metal structure; the frequency domain analysis module converts the time-domain vibration of the body sheet metal structure excitation signal into the frequency domain spectrum through FFT (fast Fourier transform). Optionally, the frequency domain analysis module is configured with an FIR (finite impulse response) or IIR (infinite impulse response) bandpass filter to filter out irrelevant noise.

[0059] S102. Perform frequency domain analysis on the excitation spectrum of the vehicle body sheet metal structure; determine whether there is a frequency band with an amplitude greater than the first threshold and a duration exceeding the second threshold. If so, it is determined that the vehicle body sheet metal structure is experiencing excitation, and then proceed to step S2; otherwise, return to step S101. Specifically, the frequency domain analysis module divides the amplitude of the excitation spectrum of the vehicle body sheet metal structure into two types: greater than the first threshold and not greater than the first threshold. If the amplitude of a certain frequency band is greater than the first threshold and the duration exceeds the second threshold, it is determined that the vehicle body sheet metal structure is experiencing excitation.

[0060] S2. Perform dynamic phase adjustment of the audio.

[0061] The audio dynamic phase adjustment includes: determining the phase superposition frequency band based on the excitation spectrum of the vehicle body sheet metal structure, the spectrum of reflected waves in the in-vehicle sound field, and the original direct output sound wave spectrum, and sending a phase control signal to the DSP power amplifier module to control the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct output sound wave spectrum.

[0062] Step S2 specifically includes: S201, determining the frequency bands whose amplitude of the excitation spectrum of the body sheet metal structure is greater than a first threshold and whose duration exceeds a second threshold as the target resonance frequency band. Specifically, the frequency domain analysis module divides the amplitude of the excitation spectrum of the body sheet metal structure into two types: greater than the first threshold and not greater than the first threshold. If the amplitude of a certain frequency band is greater than the first threshold and the duration exceeds the second threshold, then that frequency band is determined as the target resonance frequency band.

[0063] S202. Acquire the in-vehicle sound field audio signal and the original audio signal. Determine the in-vehicle sound field reflected wave spectrum based on the in-vehicle sound field audio signal, and determine the original direct output sound wave spectrum based on the original audio signal. Specifically, after the audio acquisition module acquires the in-vehicle sound field audio signal, it sends the in-vehicle sound field audio signal to the frequency domain analysis module to enable the frequency domain analysis module to acquire the in-vehicle sound field audio signal; the DSP power amplifier module sends the original audio signal to the frequency domain analysis module to enable the frequency domain analysis module to acquire the original audio signal; the frequency domain analysis module converts the audio waveforms of the in-vehicle sound field audio signal and the original audio signal into a frequency domain spectrum through FFT (fast Fourier transform). Optionally, the frequency domain analysis module is configured with an FIR (finite impulse response) or IIR (infinite impulse response) bandpass filter to filter out irrelevant noise.

[0064] S203. By comparing the target resonance frequency band, the in-vehicle sound field reflected wave spectrum, and the original direct-output sound wave spectrum through frequency domain analysis, a phase superposition frequency band is identified. If a phase superposition frequency band exists, a phase control signal is sent to the DSP power amplifier module to control the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct-output sound wave spectrum. Frequency domain analysis comparison refers to the frequency domain analysis module comparing the phase of the target resonance frequency band with the in-vehicle sound field reflected wave spectrum and the original direct-output sound wave spectrum to identify frequency bands with overlapping phases and superimposed energy, which are the phase superposition frequency bands. Controlling the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct-output sound wave spectrum means flipping the phase of the waveform corresponding to the phase superposition frequency band of the original direct-output sound wave spectrum by 180°, making the peaks of this waveform become troughs and the troughs become peaks, achieving a phase difference of 180 degrees, while the waveforms of the remaining frequency bands (non-phase superposition frequency bands) of the original direct-output sound wave spectrum remain unchanged.

[0065] This application embodiment analyzes and compares the excitation spectrum of the vehicle body sheet metal structure, the spectrum of reflected waves in the in-vehicle sound field, and the spectrum of the original direct output sound wave in the frequency domain to find the phase superposition frequency band. At the same time, it controls the DSP power amplifier module to adjust the phase of this frequency band to perform a 180° phase reversal, thereby interrupting the generation of excitation and eliminating the low-frequency humming problem caused by the phase superposition of resonant sound waves, reflected sound waves, and direct output sound waves from the speaker. Moreover, this phase reversal only adjusts the phase of the target frequency band, without attenuating the audio amplitude or superimposing additional sound waves. While suppressing low-frequency humming, it can also preserve the bass depth and stereo imaging relatively completely, thereby reducing the vibration amplitude of the sheet metal and taking into account both the high-fidelity acoustic performance of the vehicle speakers and the NVH performance of the entire vehicle interior.

[0066] Furthermore, the frequency domain analysis module in this embodiment performs FFT or bandpass filtering on the excitation signal of the vehicle body sheet metal structure detected by the vibration sensor to extract the amplitude and frequency of its frequency band. Subsequently, a threshold determination is performed; if the energy of a certain frequency band is significantly higher than the set threshold, it is determined that the vehicle body sheet metal structure is experiencing excitation. By combining amplitude and duration to compare the excitation signal against a threshold, invalid signals such as instantaneous stray vibrations, random noise, and short-term interference during vehicle operation can be effectively filtered out, preventing system misjudgment and significantly improving the accuracy of resonance identification and the stability of system operation.

[0067] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Those skilled in the art can understand that implementing all or part of the processes of the above embodiments and making equivalent changes according to the claims of this application still fall within the scope of this application.

Claims

1. An audio dynamic phase adjustment device, characterized in that, include: The DSP amplifier module is configured to output raw audio signals to the vehicle speakers. And a frequency domain analysis module, which is signal-connected to the DSP power amplifier module, is configured to: detect whether the body sheet metal structure is vibrating; if vibration occurs, perform dynamic audio phase adjustment. The dynamic audio phase adjustment includes: determining the phase superposition frequency band after frequency domain analysis based on the vibration spectrum of the body sheet metal structure, the reflected wave spectrum of the in-vehicle sound field, and the original direct output sound wave spectrum; and sending a phase control signal to the DSP power amplifier module to control the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct output sound wave spectrum.

2. The audio dynamic phase adjustment device according to claim 1, characterized in that, The determination of whether the body sheet metal is experiencing vibration specifically includes: Obtain the excitation signal of the body sheet metal structure, and determine the excitation spectrum of the body sheet metal structure based on the excitation signal; Frequency domain analysis is performed on the excitation spectrum of the body sheet metal structure. If the amplitude is greater than the first threshold and the duration exceeds the second threshold, it is determined that the body sheet metal structure is experiencing excitation.

3. The audio dynamic phase adjustment device according to claim 2, characterized in that, The audio dynamic phase adjustment specifically includes: The frequency band in which the amplitude of the excitation spectrum of the body sheet metal structure is greater than the first threshold and the duration exceeds the second threshold is determined as the target resonance frequency band; Acquire in-vehicle sound field audio signal and original audio signal; determine in-vehicle sound field reflected wave spectrum based on in-vehicle sound field audio signal; determine original direct output sound wave spectrum based on original audio signal. By comparing the target resonance frequency band, the in-vehicle sound field reflected wave spectrum, and the original direct output sound wave spectrum with the frequency domain analysis, it is found that there is a phase superposition frequency band. If a phase superposition frequency band exists, a phase control signal is sent to the DSP power amplifier module to control the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct output sound wave spectrum.

4. The audio dynamic phase adjustment device according to claim 1, characterized in that: The device also includes a vibration detection module, which is signal-connected to the frequency domain analysis module. The vibration detection module is configured to acquire vibration signals from the body sheet metal structure.

5. The audio dynamic phase adjustment device according to claim 4, characterized in that: The device also includes an audio acquisition module, which is signal-connected to the frequency domain analysis module. The audio acquisition module is configured to acquire in-vehicle sound field audio signals.

6. The audio dynamic phase adjustment device according to claim 5, characterized in that: The vibration detection module includes multiple vibration sensors, which are respectively arranged in each door of the vehicle and each side panel of the vehicle body; the audio acquisition module is a microphone installed in the headrest of the vehicle seat.

7. An audio dynamic phase adjustment method, characterized in that, include: Check if there is vibration in the body sheet metal structure. If vibration is found, perform dynamic phase adjustment of the audio. The audio dynamic phase adjustment includes: determining the phase superposition frequency band based on the excitation spectrum of the vehicle body sheet metal structure, the spectrum of reflected waves in the in-vehicle sound field, and the original direct output sound wave spectrum, and sending a phase control signal to the DSP power amplifier module to control the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct output sound wave spectrum.

8. The audio dynamic phase adjustment method according to claim 7, characterized in that: The determination of whether the body sheet metal is experiencing vibration specifically includes: Obtain the excitation signal of the body sheet metal structure, and determine the excitation spectrum of the body sheet metal structure based on the excitation signal; Frequency domain analysis is performed on the excitation spectrum of the body sheet metal structure. If the amplitude is greater than the first threshold and the duration exceeds the second threshold, it is determined that the body sheet metal structure is experiencing excitation.

9. The audio dynamic phase adjustment method according to claim 8, characterized in that, The audio dynamic phase adjustment specifically includes: The frequency band in which the amplitude of the excitation spectrum of the body sheet metal structure is greater than the first threshold and the duration exceeds the second threshold is determined as the target resonance frequency band; Acquire in-vehicle sound field audio signal and original audio signal; determine in-vehicle sound field reflected wave spectrum based on in-vehicle sound field audio signal; determine original direct output sound wave spectrum based on original audio signal. By comparing the target resonance frequency band, the in-vehicle sound field reflected wave spectrum, and the original direct output sound wave spectrum with the frequency domain analysis, it is found that there is a phase superposition frequency band. If a phase superposition frequency band exists, a phase control signal is sent to the DSP power amplifier module to control the DSP power amplifier module to perform phase reversal on the phase superposition frequency band of the original direct output sound wave spectrum.

10. A vehicle, characterized in that, Includes the audio dynamic phase adjustment device as described in any one of claims 1-6.

Images