Sound field partition control method, electronic device and vehicle

Abstract

The application discloses a sound field partition control method, electronic equipment and a vehicle. The sound field partition control method comprises the following steps: based on a plurality of target audio signals, a plurality of loudspeakers with different frequency coverage ranges in a target sound field control area are controlled; wherein the plurality of target audio signals are obtained based on an original audio signal and a plurality of different sound field partition control algorithms. The method can combine the advantages and limitations of a plurality of different sound field partition control algorithms, select a suitable sound field partition control algorithm to process the original audio signal, so that the target audio signal can take into account more optimization characteristics, and improve the listening experience and audio comfort.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a sound field zoning control method, as well as electronic devices and vehicles. Background Technology

[0002] In related technologies, traditional sound field zoning control methods often use a single sound field zoning control algorithm to achieve sound field zoning. However, single sound field zoning control algorithms have their limitations. As a result, they can only guarantee a single characteristic of the audio while ignoring other characteristics, which leads to flaws in the sound field audio and can easily cause discomfort. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, one objective of this invention is to propose a sound field zoning control method. This method can combine the advantages and limitations of multiple different sound field zoning control algorithms, select a suitable sound field zoning control algorithm to process the original audio signal, thereby enabling the target audio signal to take into account more optimized characteristics and improve listening experience and audio comfort.

[0004] The second objective of this invention is to provide an electronic device.

[0005] The third objective of this invention is to provide a vehicle.

[0006] To address the aforementioned problems, a first aspect of the present invention provides a sound field zoning control method, comprising: controlling multiple loudspeakers with different frequency coverage ranges within a target sound field control area based on multiple target audio signals; wherein the multiple target audio signals are obtained based on an original audio signal and multiple different sound field zoning control algorithms.

[0007] According to the sound field zoning control method of the present invention, a target audio signal is obtained based on the original audio signal and multiple different sound field zoning control algorithms. It can fully consider the advantages and limitations of multiple different sound field zoning control algorithms, select a suitable sound field zoning control algorithm to process the original audio signal, thereby avoiding the limitations of a single sound field zoning control algorithm, so that the target audio signal can take into account more optimization characteristics and improve the listening experience and audio comfort.

[0008] In some embodiments, multiple target audio signals are obtained based on multiple audio signals of different frequency bands and multiple filter drive signals; wherein, the multiple audio signals of different frequency bands are obtained by passing the original audio signal through filters of multiple different filtering frequency bands, and the filtering frequency bands of the multiple filters correspond to the coverage frequency bands of multiple loudspeakers with different frequency coverage ranges within the target sound field control area; the multiple filter drive signals are obtained based on the multiple different sound field zoning control algorithms.

[0009] In some embodiments, the plurality of target audio signals include a first audio signal and a second audio signal; based on the first audio signal, a first type of loudspeaker within the target sound field control area is controlled, and based on the second audio signal, a second type of loudspeaker within the target sound field control area is controlled, wherein the frequency band covered by the first type of loudspeaker is smaller than the frequency band covered by the second type of loudspeaker; wherein the first audio signal is obtained based on the original audio signal and the sound contrast control algorithm, and the second audio signal is obtained based on the original audio signal and the pressure matching algorithm.

[0010] In some embodiments, the plurality of target audio signals further include a third audio signal; based on the third audio signal, a directional loudspeaker within the target sound field control area is controlled, the directional loudspeaker covering a frequency band greater than that of the second type of loudspeaker; the third audio signal is obtained based on the original audio signal and a crosstalk cancellation algorithm.

[0011] In some embodiments, directional speakers include headrest speakers and seat speakers within the cabin.

[0012] In some embodiments, the first audio signal is obtained based on a first frequency band audio signal and a first filter drive signal; the first frequency band audio signal is obtained by passing the original audio signal through a first filter, the filtering frequency band of the first filter corresponding to the coverage frequency band of the first type of loudspeaker; the first filter drive signal is obtained based on the acoustic contrast control algorithm.

[0013] In some embodiments, the second audio signal is obtained based on a second frequency band audio signal and a second filter drive signal; the second frequency band audio signal is obtained by passing the original audio signal through a second filter, the filtering frequency band of the second filter corresponding to the coverage frequency band of the second type of loudspeaker; the second filter drive signal is based on the pressure matching algorithm.

[0014] In some embodiments, the third audio signal is obtained based on a third frequency band audio signal and a third filter drive signal; the third frequency band audio signal is obtained by passing the original audio signal through a third filter, the filtering frequency band of the third filter corresponding to the coverage frequency band of the directional speaker; the third filter drive signal is obtained based on the crosstalk cancellation algorithm.

[0015] A second aspect of the present invention provides an electronic device for implementing the sound field zoning control method described in the above embodiments.

[0016] A second aspect of the present invention provides a vehicle, the vehicle including the electronic equipment described in the above embodiments; or, the vehicle includes a plurality of loudspeakers with different frequency coverage ranges, the plurality of loudspeakers being distributed in a target sound field control area inside the vehicle, the plurality of loudspeakers outputting according to the sound field zoning control method described in the above embodiments.

[0017] According to the vehicle of the present invention, when controlling the target sound field control area inside the vehicle, the target audio signal is obtained based on the original audio signal and multiple different sound field zoning control algorithms. The advantages and limitations of multiple different sound field zoning control algorithms can be fully considered, and a suitable sound field zoning control algorithm can be selected to process the original audio signal. This can avoid the limitations of a single sound field zoning control algorithm, so that the target audio signal takes into account more optimization characteristics and improves the listening experience and audio comfort.

[0018] In some embodiments, the multiple loudspeakers with different frequency coverage ranges include a first type of loudspeaker, a second type of loudspeaker, and a directional loudspeaker; the first type of loudspeaker covers a frequency band smaller than the second type of loudspeaker; and the directional loudspeaker covers a frequency band larger than the second type of loudspeaker.

[0019] In some embodiments, the directional speakers include headrest speakers and seat speakers.

[0020] In some embodiments, the vehicle further includes: a main control module for acquiring raw audio signals; and a processing module connected to the main control module for executing the sound field zoning control method based on the raw audio signals to control the speakers.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a flowchart of a sound field zoning control method according to an embodiment of the present invention; Figure 2 This is a schematic diagram of frequency division filtering according to an embodiment of the present invention; Figure 3 This is a structural block diagram of an electronic device according to an embodiment of the present invention; Figure 4 This is a structural block diagram of a vehicle according to an embodiment of the present invention; Figure 5 This is a schematic diagram of a vehicle according to an embodiment of the present invention; Figure 6 This is a structural block diagram of a loudspeaker according to an embodiment of the present invention; Figure 7 This is a schematic diagram of a directional loudspeaker according to an embodiment of the present invention; Figure 8 This is a top view of a seat with a built-in directional speaker according to an embodiment of the present invention; Figure 9 This is a side view of a seat with a built-in directional speaker according to an embodiment of the present invention; Figure 10 This is a structural block diagram of a vehicle according to an embodiment of the present invention; Figure 11 This is a schematic diagram of the in-vehicle sound field zoning audio playback process according to an embodiment of the present invention.

[0023] Figure label: 200 vehicles; Electronic device 100; speaker 210; main control module 220; processing module 230; Processor 101; memory 102; first type of loudspeaker 211; second type of loudspeaker 212; directional loudspeaker 213. Detailed Implementation

[0024] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0025] Existing solutions often employ a single sound field zoning control algorithm to achieve sound field zoning. However, single sound field zoning control algorithms have their limitations. Consequently, they can only guarantee a single characteristic of the audio while ignoring other characteristics, resulting in flaws in the sound field audio and easily causing discomfort.

[0026] To address the above problems, the first aspect of this invention provides a sound field zoning control method. This method combines the advantages and limitations of multiple different sound field zoning control algorithms, selects a suitable sound field zoning control algorithm to process the original audio signal, thereby enabling the target audio signal to take into account more optimization features and improve listening experience and audio comfort.

[0027] The following is for reference. Figure 1 A sound field zoning control method according to an embodiment of the first aspect of the present invention is described, such as... Figure 1 As shown, the method includes at least step S1.

[0028] Step S1: Based on multiple target audio signals, control multiple loudspeakers with different frequency coverage ranges within the target sound field control area.

[0029] Among them, multiple target audio signals are obtained based on the original audio signal and multiple different sound field zoning control algorithms.

[0030] Specifically, to ensure an independent sound space for each occupant in the cabin, a sound field zoning control method is used to play audio signals through speakers with different frequency coverage ranges in different areas. After acquiring the original audio signal, its frequency is analyzed, and a corresponding sound field zoning control algorithm is selected from multiple different sound field zoning control algorithms based on the frequency of the original audio signal. For example, multiple different sound field zoning control algorithms may include: sound contrast control algorithm, pressure matching algorithm, crosstalk cancellation algorithm, multi-region constraint optimization algorithm, beamforming algorithm, etc., for processing the original audio signal.

[0031] The sound contrast control algorithm maximizes sound contrast, suppresses low-frequency leakage and standing wave effects, and enhances the immersive and powerful listening experience for passengers in each zone; the pressure matching algorithm better restores the sound field and avoids sound quality damage caused by sound field zoning; the crosstalk cancellation algorithm specifically solves the crosstalk problem of sound from the left speaker going to the right ear and sound from the right speaker going to the left ear; the multi-zone constraint optimization algorithm simultaneously constrains the sound pressure in the bright zone, the sound pressure in the dark zone, and the speaker output power, performing multi-objective weighted optimization with high engineering practicality; the beamforming algorithm includes delay summation and generalized sidelobe cancellation, focusing sound energy into the bright zone and reducing sidelobes in the dark zone.

[0032] The original audio signal can be divided into low frequency, mid frequency, and high frequency. If the same sound field zoning control algorithm is used for all original audio signals of different frequencies, the resulting target audio signal cannot simultaneously achieve acoustic contrast and sound quality. Therefore, the corresponding sound field zoning control algorithm is selected based on the frequency of the original audio signal to obtain the target audio signal. The target audio signal can be understood as the audio signal that controls the speakers after being processed by the sound field zoning control algorithm. Each original audio signal is processed by the corresponding sound field zoning control algorithm from among multiple different sound field zoning control algorithms. Multiple original audio signals are processed to obtain multiple target audio signals. Based on the target audio signal, multiple speakers with different frequency coverage ranges within the target sound field control area are controlled to play audio. The target sound field control area can be understood as the area in the cabin where the target audio signal is expected to be clear, loud, and played normally, which is also the bright area. For example, when the vehicle is in motion, the driver uses navigation, and to avoid disturbing other passengers, the target sound field control area is the driver's seat. If the original audio signal is a low-frequency signal, it will be played through speakers covering the low-frequency range after being processed by the sound field zoning control algorithm. If the original audio signal is a mid-frequency signal, it will be played through speakers covering the mid-frequency range after being processed by the sound field zoning control algorithm. If the original audio signal is a high-frequency signal, it will be played through speakers covering the high-frequency range after being processed by the sound field zoning control algorithm.

[0033] After obtaining the original audio signal, it can also be divided into multiple frequency bands to obtain multiple audio signals of different frequency bands. Each frequency band audio signal is processed by a different sound field partition control algorithm to obtain multiple target audio signals. Based on the multiple target audio signals, multiple speakers with different frequency coverage ranges in the target sound field control area are controlled to play audio.

[0034] According to the sound field zoning control method of the present invention, a target audio signal is obtained based on the original audio signal and multiple different sound field zoning control algorithms. It can fully consider the advantages and limitations of multiple different sound field zoning control algorithms, select a suitable sound field zoning control algorithm to process the original audio signal, thereby avoiding the limitations of a single sound field zoning control algorithm, so that the target audio signal can take into account more optimization characteristics and improve the listening experience and audio comfort.

[0035] In some embodiments, multiple audio signals of different frequency bands are obtained by passing the original audio signal through multiple filters of different filtering frequency bands, and the filtering frequency bands of the multiple filters correspond to the coverage frequency bands of multiple loudspeakers with different frequency coverage ranges within the target sound field control area.

[0036] Specifically, after acquiring the original audio signal, the original audio signal is frequency-divided and filtered. After passing through multiple filters with different filtering frequency bands, multiple audio signals with different frequency bands are obtained. The filtering frequency bands of the multiple filters correspond to the coverage frequency bands of multiple loudspeakers with different frequency coverage ranges within the target sound field control area. The filtering frequency band is the frequency band that is allowed to pass. For example, the coverage frequency band of the loudspeakers is divided into 0Hz-20KHz, and the loudspeakers are divided into low-frequency loudspeakers, mid-frequency loudspeakers, and high-frequency loudspeakers. The filtering frequency bands of the multiple filters are also 0Hz-20KHz. After passing through filters with different filtering frequency bands, the original audio signal is divided into multiple target audio signals.

[0037] Multiple filter drive signals are obtained based on multiple different sound field zoning control algorithms. That is, each filter drive signal is obtained according to multiple different sound field zoning control algorithms. The filter drive signals are calibrated and stored before the vehicle leaves the factory. The original audio signal is frequency divided and filtered to obtain multiple audio signals of different frequency bands. The audio signals of different frequency bands can be the first frequency band audio signal, the second frequency band audio signal, and the third frequency band audio signal. After obtaining multiple audio signals of different frequency bands, multiple target audio signals are obtained based on the multiple audio signals of different frequency bands and the multiple filter drive signals.

[0038] For example, the filters can be low-pass filters, band-pass filters, and high-pass filters. The passband of the low-pass filter is 0~f1, where f1 can be 200 Hz, and it is used to separate low-frequency signals. The passband of the band-pass filter is f1~f2, where f2 can be 2kHz, and it is used to separate intermediate frequency signals. The passband of the high-pass filter is f3~fs / 2, where f3 can be 2kHz, fs is the sampling rate, and fs / 2 can be 20kHz. Here, f1, f2, and f3 are the speaker's operating cutoff frequencies. The original audio signal of the audio stream is divided into frequencies by passing it through the low-pass filter h1 (0~200 Hz), the band-pass filter h2 (200 Hz~2kHz), and the high-pass filter h3 (2kHz~20kHz).

[0039] The formulas for outputting multiple audio signals of different frequency bands are as follows: ; ; ; Wherein, V1 is the first frequency band audio signal, V2 is the second frequency band audio signal, and V3 is the third frequency band audio signal. x ( n () represents the original audio signal. h 1 ( n () represents the unit impulse response of the low-pass filter. h 2 ( n () represents the unit impulse response of the bandpass filter. h 3 ( n () represents the unit impulse response of the high-pass filter.

[0040] In some embodiments, the plurality of target audio signals include a first audio signal and a second audio signal; based on the first audio signal, a first type of loudspeaker within the target sound field control area is controlled, and based on the second audio signal, a second type of loudspeaker within the target sound field control area is controlled, wherein the frequency band covered by the first type of loudspeaker is smaller than the frequency band covered by the second type of loudspeaker.

[0041] Specifically, multiple target audio signals are obtained by frequency division filtering of the original audio signal through multiple filters with different filtering frequency bands. The multiple target audio signals may include a first audio signal and a second audio signal. The first type of loudspeaker in the target sound field control area is controlled according to the first audio signal, and the second type of loudspeaker in the target sound field control area is controlled according to the second audio signal. Since the frequency band covered by the first type of loudspeaker is smaller than that covered by the second type of loudspeaker, the first type of loudspeaker can be a low-frequency loudspeaker, and the second type of loudspeaker can be a mid-frequency loudspeaker. The first audio signal is a low-frequency signal, and the second audio signal is a mid-frequency signal.

[0042] Furthermore, the first audio signal is obtained based on the original audio signal and the sound contrast control algorithm, and the second audio signal is obtained based on the original audio signal and the pressure matching algorithm.

[0043] Specifically, the first audio signal is a low-frequency signal. The original audio signal is processed by an acoustic contrast control algorithm to obtain the first audio signal. In the low-frequency sub-band (usually below 200Hz), an acoustic contrast control (ACC) method is used. Low-frequency wavelengths are relatively long, and the cabin is a closed space. Strong standing waves will be generated in the low frequency range, resulting in excessive bass in some positions and no bass in others. At this time, the acoustic contrast control algorithm can effectively control its phase change, maximize the acoustic contrast, and excite the opposite mode through the speaker array to smooth the standing waves, thereby producing a flatter and more accurate low-frequency response in the target sound field control area.

[0044] The second audio signal is an intermediate frequency (IF) signal. The original audio signal is processed by a pressure matching algorithm to obtain the second audio signal. The intermediate frequency sub-band (usually 200Hz-2kHz) uses the pressure matching algorithm (PM). The intermediate frequency is the frequency band that the human ear is most sensitive to in timbre and speech clarity. The pressure matching algorithm can ensure high-quality reproduction of this core content. In the intermediate frequency, where the energy of the sound source accounts for a high proportion, an ideal target sound field can be accurately reconstructed to avoid damage to sound quality. At the same time, the pressure matching algorithm creates a relatively larger and more stable "sweet spot" area in the bright area, so even if the passenger's head moves slightly, a good listening experience can still be obtained.

[0045] In some embodiments, the plurality of target audio signals further include a third audio signal; based on the third audio signal, a directional loudspeaker within the target sound field control area is controlled, the directional loudspeaker covering a frequency band greater than that of the second type of loudspeaker.

[0046] Specifically, multiple target audio signals are obtained by frequency division filtering of the original audio signal through multiple filters with different filtering frequency bands. The multiple target audio signals may include a first audio signal, a second audio signal, and a third audio signal. The directional loudspeaker in the target sound field control area is controlled according to the third audio signal. Since the directional loudspeaker covers a wider frequency band than the second type of loudspeaker, the directional loudspeaker can be a high-frequency loudspeaker, and the third audio signal is a high-frequency signal.

[0047] Furthermore, the third audio signal is obtained based on the original audio signal and a crosstalk cancellation algorithm.

[0048] Specifically, the third audio signal is a high-frequency signal. The original audio signal is processed by a crosstalk cancellation algorithm to obtain the third audio signal. The high-frequency sub-band (usually above 2kHz) uses the high-frequency directivity of the speaker. High-frequency information (such as sibilance, cymbal sounds, and details) is delivered directly to the ear, unaffected by the complex in-car acoustic environment (reflection, reverberation), resulting in extremely high clarity. Utilizing the physical characteristics of the directional speaker being close to the human ear, the good directivity and attenuation of high-frequency sound achieve the zoning effect. At the same time, the crosstalk cancellation algorithm (XTC) ensures that the sound waves accurately reach the vicinity of the human ear. The crosstalk cancellation algorithm is the core algorithm for headrest near-field sound field zoning and binaural stereo playback, specifically designed to solve the crosstalk problem where the sound from the left speaker goes to the right ear and the sound from the right speaker goes to the left ear.

[0049] In some embodiments, directional speakers include headrest speakers and seat speakers within the cabin.

[0050] Specifically, the directional loudspeaker consists of two parts: headrest speakers and seat speakers in the cabin. The seat speakers are designed to address the issue that the height of young passengers prevents their hearing sweet spot from covering both ears. The headrest speakers and seat speakers play high-frequency frequencies, and the high directivity and rapid attenuation of the high-frequency sound from the directional loudspeakers are used to achieve sound field zoning of high-frequency signals.

[0051] For example, sound field zoning control algorithms are currently implemented through three main methods: sound contrast control, pressure matching algorithm, and headrest speaker method. These three methods achieve sound field zoning effects from different perspectives, but each has its drawbacks.

[0052] The sound contrast control algorithm suffers from significant sound quality loss. Its sole optimization objective is to maximize sound contrast, and changes in the sound field phase result in substantial sound quality degradation. The filters generated by the algorithm cause severely uneven frequency responses in bright areas, resulting in muffled, distorted, or metallic sounds that greatly impact the passenger's listening experience. Furthermore, the algorithm exhibits poor robustness; even slight changes in the vehicle environment (such as passenger additions or removals, or object movement) may necessitate remeasurement of the transfer function and recalculation of the filters, demonstrating poor adaptability.

[0053] Pressure matching algorithms suffer from poor isolation and represent a trade-off between sound quality and contrast. In the low-frequency range, where physical diffraction is extremely strong, pressure matching algorithms must sacrifice a significant amount of contrast to reduce sound field reconstruction errors, resulting in severe bass leakage and an inability to achieve true zone separation.

[0054] While headrest speakers offer physical sound field zoning, they suffer from low-frequency deficiencies. Using headrest speakers for sound field zoning is the simplest way to achieve this effect, leveraging their proximity to the ears and the natural attenuation of sound waves. However, the small size of headrest speaker units limits their ability to effectively reproduce low frequencies, resulting in a thin, lacking, and unimpressive sound, leading to a poor listening experience. Another drawback is that the sound seems to come from right behind the ears, failing to create a wide, natural, and immersive sound field, resulting in an unnatural listening experience. Furthermore, when using headrest speakers as the primary playback channel, their versatility must be considered. For children and teenagers, their height means the sweet spot of the sound field zoning may not effectively cover their ears, further degrading the zoning effect.

[0055] Traditional sound field zoning control methods often employ one of the above methods, focusing on full-band control without considering the physical characteristics of the loudspeakers. Furthermore, a single algorithm for sound field zoning has its limitations, failing to balance acoustic contrast and sound quality. This invention employs multiple different sound field zoning control algorithms, along with frequency division filtering technology, and allocates frequency bands according to the loudspeakers to maximize their performance. In the low-frequency range, an acoustic contrast control algorithm is used to maximize contrast; in the mid-frequency range, a pressure matching algorithm is used to optimize system sound quality. This fully considers the physical characteristics of sound waves in different frequency bands and the advantages and limitations of different technologies, balancing acoustic contrast and sound quality performance. In the high-frequency range, directional loudspeakers are used, and a crosstalk cancellation algorithm is employed to avoid the shortcomings of a single algorithm.

[0056] In some embodiments, the first frequency band audio signal is obtained by passing the original audio signal through a first filter, and the filtering frequency band of the first filter corresponds to the coverage frequency band of the first type of loudspeaker.

[0057] Specifically, the filtering frequency band of the first filter corresponds to the coverage frequency band of the first type of loudspeaker. The first type of loudspeaker is a low-frequency loudspeaker; therefore, the first filter can be a low-pass filter. The filtering frequency band of the first filter corresponds to the coverage frequency band of the first type of loudspeaker, and the filtering frequency band of the first filter can be 0~200 Hz. The first frequency band audio signal is obtained by passing the original audio signal through the first filter. The output formula for the first frequency band audio signal is: ; Wherein, V1 is the first frequency band audio signal. x ( n () represents the original audio signal. h 1 ( n () represents the unit impulse response of the low-pass filter.

[0058] The first filter driving signal is obtained based on the acoustic contrast control algorithm. After acquiring the first filter driving signal and the first frequency band audio signal, the first filter driving signal and the first filter driving signal are convolved to obtain the first audio signal.

[0059] In some embodiments, the second frequency band audio signal is obtained by passing the original audio signal through a second filter, and the filtering frequency band of the second filter corresponds to the coverage frequency band of the second type of loudspeaker.

[0060] Specifically, the filtering frequency band of the second filter corresponds to the coverage frequency band of the second type of loudspeaker. The second type of loudspeaker is a mid-frequency loudspeaker; therefore, the second filter can be a bandpass filter. The filtering frequency band of the bandpass filter corresponds to the coverage frequency band of the second type of loudspeaker, and the filtering frequency band of the bandpass filter can be 200 Hz to 2 kHz. The second frequency band audio signal is obtained by passing the original audio signal through the second filter. The output formula for the second frequency band audio signal is: ; Wherein, V2 is the second frequency band audio signal. x ( n () represents the original audio signal. h 2 ( n () represents the unit impulse response of the bandpass filter.

[0061] The second filter drive signal is obtained based on the pressure matching algorithm. After obtaining the second filter drive signal and the second frequency band audio signal, the second filter drive signal and the second filter drive signal are convolved to obtain the second audio signal.

[0062] For example, when acquiring the first filter drive signal and the second filter drive signal, the sound field zoning transfer function is measured and calculated: a microphone array is arranged at the target listening point in the cockpit, and the loudspeakers are controlled to play sinusoidal sweep signals one by one. The data collected by the microphone array is analyzed, and the electroacoustic transfer function of the l-th low-frequency loudspeaker to the m-th microphone is obtained respectively. And the electroacoustic transfer function of the nth intermediate frequency loudspeaker to the mth microphone. m = 1, 2…M, where M is the number of microphones; l = 1, 2…L, where L is the number of low-frequency speakers; n = 1, 2…N, where N is the number of mid-frequency speakers; for Performing an FFT (Fast Fourier Transform) yields... , , That is, the electroacoustic transfer function of the l-th low-frequency loudspeaker to the m-th microphone. Let be the electroacoustic transfer function of the nth intermediate frequency loudspeaker to the mth microphone. Specifically: ; ; The electroacoustic transfer function from the loudspeaker to the control point in the bright zone is denoted as: The electroacoustic transfer function from the loudspeaker to the control point in the dark zone is denoted as... The bright area is the target listening area where you want the sound to be clear, loud, and of good quality, while the dark area is the non-target area where you need to suppress crosstalk, be as quiet as possible, and not be disturbed.

[0063] The first filter drive signal and the second filter drive signals W1 and W2 are calculated using the loudspeaker acoustic transfer function. The first filter drive signal is W1, and the second filter drive signal is W2, as shown in the following formula: ; ; in, This represents the eigenvector corresponding to the largest eigenvalue of the matrix. For regularization parameters, For identity matrix, operators H It is the conjugate transpose. This is the target vector for the bright area.

[0064] After calculating the first filter driving signal W1 and the second filter driving signal W2 using the above formulas, the first frequency band audio signal V1 and the second frequency band audio signal V2 are obtained; the first audio signal is obtained by convolving the first filter driving signal W1 with the first frequency band audio signal V1; the second audio signal is obtained by convolving the second filter driving signal W2 with the second frequency band audio signal V2.

[0065] In some embodiments, the third frequency band audio signal is obtained by passing the original audio signal through a third filter, and the filtering frequency band of the third filter corresponds to the coverage frequency band of the directional loudspeaker; the driving signal of the third filter is obtained based on a crosstalk cancellation algorithm.

[0066] Specifically, the filtering frequency band of the third filter corresponds to the coverage frequency band of the directional loudspeaker. Since the directional loudspeaker is a high-frequency loudspeaker, the third filter can be a high-pass filter. The filtering frequency band of the high-pass filter corresponds to the coverage frequency band of the directional loudspeaker, and the filtering frequency band of the high-pass filter can be 2kHz~20kHz. The third-band audio signal is obtained by passing the original audio signal through the third filter. The output formula for the third-band audio signal is: ; V3 represents the third frequency band audio signal. x ( n () represents the original audio signal. h 3 ( n() represents the unit impulse response of the high-pass filter.

[0067] The third filter driving signal is obtained based on the crosstalk cancellation algorithm. After obtaining the third filter driving signal and the third frequency band audio signal, the third filter driving signal and the third filter driving signal are convolved to obtain the third audio signal.

[0068] For example, when acquiring the third filter drive signal, the head transfer function is measured and calculated. An artificial head is placed at the seat in the cockpit, and a sinusoidal sweep signal is played by a directional speaker. The acoustic signals at both ears of the artificial head are collected and analyzed to obtain the electroacoustic transfer functions of the left and right directional speakers to the left and right ear microphones, and then an FFT transform is performed to obtain... At this point, the head transfer function matrix is: ; in, H The electroacoustic transfer function matrix, Let be the electroacoustic transfer function from the left loudspeaker to the left ear. Let be the electroacoustic transfer function from the right speaker to the left ear. Let be the electroacoustic transfer function from the left loudspeaker to the right ear. Let be the electroacoustic transfer function from the right speaker to the right ear.

[0069] The third filter drive signal is obtained as follows: ; Wherein, W3 is the third filter drive signal. H -1 It is the inverse matrix of the electroacoustic transfer function matrix. This is a diagonal matrix constructed for the electroacoustic transfer function from the left loudspeaker to the left ear and the electroacoustic transfer function from the right loudspeaker to the right ear.

[0070] After calculating the third filter driving signal W3 using the above formula, the third frequency band audio signal V3 is obtained. The third audio signal is obtained by convolving the third filter driving signal W3 with the third frequency band audio signal V3.

[0071] In some embodiments, the present invention proposes a sound field zoning control method, which, compared with the existing single algorithm, uses multiple different sound field zoning control algorithms to achieve sound field zoning control, thereby realizing full-band sound field zoning technology. At the same time, it proposes a speaker integrated into the headrest and seat to effectively cover passengers of different ages in the sweet spot.

[0072] like Figure 2As shown, the original audio signal is first subjected to frequency division filtering. The filter has low computational complexity, maximizes the utilization of speaker performance, and combines the advantages of multiple algorithms to achieve a balance between sound contrast and sound quality. After frequency division filtering, the first filter driving signal corresponding to the low frequency part is obtained using a sound contrast control algorithm to maximize sound contrast, suppress low frequency leakage and standing wave effects, and enhance the immersion and power of the sound for passengers in each zone. The second filter driving signal corresponding to the mid frequency is obtained using a pressure matching algorithm to better restore the sound field and avoid sound quality damage caused by sound field zoning. The third filter driving signal corresponding to the high frequency is obtained using a crosstalk cancellation algorithm to specifically solve the crosstalk problem of the sound from the left speaker going to the right ear and the sound from the right speaker going to the left ear.

[0073] The system acquires the first, second, and third frequency band audio signals after frequency division, as well as the first, second, and third filter drive signals. The first audio signal is obtained by convolving the first filter drive signal with the first frequency band audio signal; the second audio signal is obtained by convolving the second filter drive signal with the second frequency band audio signal; and the third audio signal is obtained by convolving the third filter drive signal with the third frequency band audio signal. Based on the first audio signal, the system controls the low-frequency loudspeakers (type 1 loudspeakers) within the target sound field control area; based on the second audio signal, it controls the mid-frequency loudspeakers (type 2 loudspeakers) within the target sound field control area; and based on the third audio signal, it controls the directional loudspeakers (high-frequency loudspeakers) within the target sound field control area. The directional loudspeaker design utilizes the strong directivity of the loudspeaker's high-frequency sound to improve the sound field zoning control bandwidth and reduce high-frequency sound leakage, while also avoiding changes in auditory perception caused by passenger head movement and height variations in young passengers.

[0074] A second aspect of the present invention provides an electronic device for implementing a sound field zoning control method. In the embodiment, the electronic device may include a processor and a memory, or a computer-readable storage medium, or a computer program product, etc., and the electronic device may include a vehicle, etc., without specific limitations.

[0075] like Figure 3 As shown, an electronic device according to an embodiment of the present invention includes a processor and a memory. The electronic device 100 may include at least one processor 101 and a memory 102.

[0076] In this embodiment, at least one processor 101 is configured with sound field zoning control; at least one processor 101 is connected to a memory 102; the memory 102 stores a computer program that can be executed by at least one processor 101, and the at least one processor 101 implements the sound field zoning control method when executing the computer program.

[0077] According to the electronic device of the present invention, the corresponding sound field zoning control program can be stored in the memory. When implementing the sound field zoning control method, the target audio signal is obtained based on the original audio signal and multiple different sound field zoning control algorithms. The advantages and limitations of multiple different sound field zoning control algorithms can be fully considered, and a suitable sound field zoning control algorithm can be selected to process the original audio signal. This can avoid the limitations of a single sound field zoning control algorithm, so that the target audio signal takes into account more optimization characteristics and improves the listening experience and audio comfort.

[0078] A third aspect of the present invention provides a vehicle, such as Figure 4 As shown, vehicle 200 includes electronic equipment 100; or, as Figure 5 As shown, the vehicle 200 includes multiple speakers 210 with different frequency coverage ranges. The multiple speakers 210 are distributed in the target sound field control area inside the vehicle, and the multiple speakers 210 output according to the sound field zoning control method.

[0079] Specifically, the sound field control area in the vehicle cabin is divided into a bright area and a dark area. The target sound field control area is the area in the vehicle cabin where the target audio signal is expected to be clear, loud, and played normally, which is the bright area. For example, when the vehicle is in motion, the driver uses navigation, and to avoid disturbing other passengers, the target sound field control area is the driver's seat.

[0080] For example, the emergence of new energy vehicle cabin sound field zoning control technology stems from the transformation of automobiles from traditional driving tools to intelligent "third living spaces." The inherent quietness of electric vehicles provides a foundation for high-quality audio, but it also amplifies the conflict between various in-cabin sound needs (such as navigation, entertainment, and rest). Thanks to the maturity of digital signal processing technology and multi-speaker systems, sound field zoning has become possible. Its significance extends far beyond the technology itself; it completely revolutionizes the cabin experience by creating an independent sound space for each occupant, achieving a unity of privacy, exclusivity, and quietness, while ensuring the effective transmission of critical safety information. It is a key component in building a personalized intelligent mobility ecosystem.

[0081] The sound field zoning control method in this invention, compared to a single algorithm, uses multiple different sound field zoning control algorithms to drive the sound field zoning technology when performing in-vehicle sound field zoning control, thereby achieving full-band sound field zoning technology. Sound field zoning control in the car cabin typically sets the control area to the area where the heads of front and rear passengers are located, or the driver's seat, front passenger seat, or any location inside the vehicle, such as... Figure 5 As shown.

[0082] The multi-strategy driven in-vehicle sound field zoning technology mentioned in this invention mainly utilizes frequency division filtering technology to divide the sound signal into three sub-bands and uses different methods for zoning control. The filter has lower computational complexity and requires less computation compared to broadband filtering. At the same time, the sound signal is divided into sub-bands corresponding to the speaker's operating frequency band and corresponding algorithms are applied to maximize the utilization of speaker performance while avoiding the defects caused by a single algorithm. The specific sub-band division can be determined according to the operating range of the vehicle's low, mid, and high-frequency speakers.

[0083] According to the vehicle of the present invention, when controlling the target sound field control area inside the vehicle, the target audio signal is obtained based on the original audio signal and multiple different sound field zoning control algorithms. The advantages and limitations of multiple different sound field zoning control algorithms can be fully considered, and a suitable sound field zoning control algorithm can be selected to process the original audio signal. This can avoid the limitations of a single sound field zoning control algorithm, so that the target audio signal takes into account more optimization characteristics and improves the listening experience and audio comfort.

[0084] In some embodiments, such as Figure 6 As shown, the multiple loudspeakers 210 with different frequency coverage ranges include a first type of loudspeaker 211, a second type of loudspeaker 212, and a directional loudspeaker 213.

[0085] Specifically, the frequency band covered by the first type of loudspeaker 211 is smaller than that covered by the second type of loudspeaker 212, while the frequency band covered by the directional loudspeaker 213 is larger than that covered by the second type of loudspeaker 212.

[0086] In some embodiments, such as Figure 7 As shown, the directional speaker 212 includes a headrest speaker and a seat speaker.

[0087] The top view of the seat with built-in directional speaker 212 is shown below. Figure 8 As shown, the seat side view of the built-in directional speaker 212 is as follows. Figure 9 As shown.

[0088] In some embodiments, such as Figure 10 As shown, the vehicle 200 also includes a main control module 220 and a processing module 230.

[0089] The main control module 220 is used to acquire the original audio signal, and the processing module 230 is connected to the main control module 220 and is used to execute the sound field zoning control method based on the original audio signal to control the speaker 210.

[0090] Specifically, the processing module 230 can be a DSP (Digital Signal Processing) module, which includes a frequency division module and a filtering module. The filtering module can be an FIR (Finite Impulse Response Filter). The main control module 220 acquires the original audio signal, transmits it to the frequency division module for frequency division processing, and then performs filtering processing by the filtering module. Figure 11 As shown, the audio playback process of the in-vehicle sound field zoning is as follows: after the main control module obtains the original audio signal, it uses the frequency division module to divide the frequency band, then the filtering module performs sound field zoning filtering, the audio signal after sound field zoning filtering is amplified by the power amplifier module, and finally output to the corresponding speaker for playback through the playback module.

[0091] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0092] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for controlling sound field zoning, characterized in that, include: Based on multiple target audio signals, control multiple loudspeakers with different frequency coverage ranges within the target sound field control area; The multiple target audio signals are obtained based on the original audio signal and multiple different sound field partitioning control algorithms.

2. The sound field zoning control method according to claim 1, characterized in that, The multiple target audio signals are obtained based on multiple audio signals of different frequency bands and multiple filter drive signals; The multiple audio signals of different frequency bands are obtained by passing the original audio signal through multiple filters of different frequency bands, and the filtering frequency bands of the multiple filters correspond to the coverage frequency bands of multiple loudspeakers with different frequency coverage ranges within the target sound field control area; The multiple filter drive signals are obtained based on the multiple different sound field zoning control algorithms.

3. The sound field zoning control method according to claim 1 or 2, characterized in that, The plurality of target audio signals include a first audio signal and a second audio signal; Based on a first audio signal, a first type of loudspeaker within the target sound field control area is controlled, and based on a second audio signal, a second type of loudspeaker within the target sound field control area is controlled, wherein the frequency band covered by the first type of loudspeaker is smaller than the frequency band covered by the second type of loudspeaker; The first audio signal is obtained based on the original audio signal and the sound contrast control algorithm, and the second audio signal is obtained based on the original audio signal and the pressure matching algorithm.

4. The sound field zoning control method according to claim 3, characterized in that, The plurality of target audio signals also include a third audio signal; Based on the third audio signal, the directional loudspeakers within the target sound field control area are controlled, and the frequency band covered by the directional loudspeakers is greater than the frequency band covered by the second type of loudspeakers; The third audio signal is obtained based on the original audio signal and the crosstalk cancellation algorithm.

5. The sound field zoning control method according to claim 4, characterized in that, The directional speakers include headrest speakers and seat speakers within the cabin.

6. The sound field zoning control method according to claim 3, characterized in that, The first audio signal is obtained based on a first frequency band audio signal and a first filter drive signal; The first frequency band audio signal is obtained by passing the original audio signal through a first filter, and the filtering frequency band of the first filter corresponds to the coverage frequency band of the first type of loudspeaker; The first filter drive signal is obtained based on the acoustic contrast control algorithm.

7. The sound field zoning control method according to claim 3, characterized in that, The second audio signal is obtained based on the second frequency band audio signal and the second filter drive signal; The second frequency band audio signal is obtained by passing the original audio signal through a second filter, and the filtering frequency band of the second filter corresponds to the coverage frequency band of the second type of loudspeaker; The second filter drive signal is based on the pressure matching algorithm.

8. The sound field zoning control method according to claim 4, characterized in that, The third audio signal is obtained based on the third frequency band audio signal and the third filter drive signal; The third frequency band audio signal is obtained by passing the original audio signal through a third filter, and the filtering frequency band of the third filter corresponds to the coverage frequency band of the directional speaker; The third filter drive signal is obtained based on the crosstalk cancellation algorithm.

9. An electronic device, characterized in that, The electronic device is used to implement the sound field zoning control method according to any one of claims 1-8.

10. A vehicle, characterized in that, The vehicle includes the electronic equipment as described in claim 9; Alternatively, the vehicle may include multiple loudspeakers with different frequency coverage ranges, the multiple loudspeakers being distributed in the target sound field control area inside the vehicle, and the multiple loudspeakers outputting sound field zoning control method according to any one of claims 1-8.

11. The vehicle according to claim 10, characterized in that, The multiple loudspeakers with different frequency coverage ranges include a first type of loudspeaker, a second type of loudspeaker, and a directional loudspeaker; The frequency range covered by the first type of loudspeaker is smaller than that covered by the second type of loudspeaker; The directional loudspeaker has a wider frequency coverage than the second type of loudspeaker.

12. The vehicle according to claim 11, characterized in that, The directional speakers include headrest speakers and seat speakers.

13. The vehicle according to claim 10, characterized in that, The vehicle also includes: The main control module is used to acquire the raw audio signal; The processing module, connected to the main control module, is used to execute the sound field zoning control method based on the original audio signal to control the speaker.

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