Directional active silencer and directional silencing method

Abstract

The invention discloses a directional active silencer and a directional silencing method. The directional active silencer comprises a first shell and a second shell. The first shell is of a curved surface structure, and the second shell is of a circular plane. The edge of the first shell and the edge of the second shell are connected to form a hollow cavity; an infrared detector array, a sound sensor array and an ultrasonic generator array are uniformly arranged on the first shell at intervals; a processing module is arranged in a hollow cavity formed by the first shell and the second shell. The directional active silencer effectively solves the problems that information is shielded due to closed design of an active earphone, and the active earphone cannot be expanded to a multi-person environment or precise directional noise reduction cannot be achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of silencers and relates to a directional active silencer and a directional silencer method. Background Art

[0002] Noise pollution has become a core environmental issue in modern society, with its negative impact being particularly pronounced in high-frequency noise environments such as offices, transportation, and industry. In open office environments, the constant clacking of keyboards, equipment operation, and conversation (typically in the 60-80dB range) significantly distracts attention, leading to a 15%-30% decrease in work efficiency and even causing accumulated psychological stress and fatigue among employees. In traffic, the roar of vehicle engines (85-100dB) and honking horns (90-110dB) not only disrupts driver concentration but also poses a health threat to residents living near roads. High-decibel mechanical noise (above 100dB) in industrial settings directly damages workers' hearing systems, and traditional protective measures struggle to balance operational safety and communication needs. In a shared room, snoring disrupts the sleep of others and, in severe cases, can impact physical and mental health.

[0003] Current mainstream noise control technologies include passive noise cancellation and active noise-canceling headphones. Passive noise cancellation technologies (such as soundproofing foam and sound-absorbing panels) rely on physical materials to absorb sound energy. While they can reduce low- and mid-frequency noise (500Hz-2kHz), their effectiveness against high-frequency noise (>4kHz) is significantly reduced. They also require large installation volumes (e.g., wall insulation layers ≥10cm thick), making them unsuitable for mobile scenarios. More importantly, they have a narrow frequency range (typical soundproofing foam has an effective bandwidth of only 1.5kHz) and lack dynamic response capabilities, making them incapable of handling sudden noises (such as equipment noise). Active noise-cancelling headphones use microphones to collect ambient sound and generate anti-phase sound waves. Although they can achieve personal instantaneous noise reduction (20-40dB attenuation), they have two bottlenecks: first, the closed design isolates all external sounds, resulting in the shielding of necessary communication information (such as conversations with colleagues and alarm prompts), forming an "information island"; second, the technical principle relies on the enclosed space of the headphones and the ear canal, and cannot be extended to an environment shared by multiple people (such as conference rooms and workshops), let alone achieve "directional muting", that is, only eliminating noise in a specific location while retaining the surrounding sound propagation. Summary of the Invention

[0004] In response to the problems existing in the prior art, the present invention provides a directional active silencer and a directional noise reduction method, thereby solving the problem that active headphones in the prior art cause information shielding due to their closed design and cannot be expanded to multi-person environments or achieve precise directional noise reduction.

[0005] The present invention is achieved through the following technical solutions: A directional active muffler comprises a first shell and a second shell; the first shell is a curved surface structure, and the second shell is a circular plane; The edge of the first shell is connected to the edge of the second shell to form a hollow cavity; An infrared detector array, a sound sensor array, and an ultrasonic generator array are evenly spaced on the first shell; The infrared detector array is used to obtain the position information of the human ear and the position information of the directional active silencer; The sound sensor array is used to collect ambient audio and obtain frequency domain information of the ambient audio; A processing module is provided in the hollow cavity formed by the first shell and the second shell, and the processing module is used to generate an anti-phase sound wave signal according to the frequency domain information of the ambient audio, and obtain the delay parameter of the ultrasonic generator array according to the position information of the human ear and the position information of the directional active silencer; The ultrasonic generator array is used to transmit the reverse phase sound wave signal according to the delay parameter, and to superimpose the reverse phase sound wave signal with the frequency domain information of the ambient audio at the position of the human ear.

[0006] Preferably, the shell includes a first shell and a second shell that are connected to each other; the first shell is a curved surface structure, and the second shell is a circular plane.

[0007] Preferably, the infrared detector array includes a plurality of infrared detectors, and the infrared detectors are infrared cameras and infrared ranging sensors.

[0008] Preferably, the plurality of infrared detectors are evenly distributed on the first shell, and the positioning accuracy of the infrared detectors is ≤5 mm.

[0009] Preferably, the sound sensor array includes a plurality of sound sensors, and the plurality of sound sensors are evenly distributed on the first shell.

[0010] Preferably, the ultrasonic generator array includes a plurality of ultrasonic generators, and the plurality of ultrasonic generators are evenly distributed on the first shell.

[0011] Preferably, the outer surface of the first shell is provided with a sound-transmitting material, and a sound insulation layer is provided in the hollow cavity formed by the first shell and the second shell.

[0012] Preferably, the second shell is provided with a magnetic base, a threaded interface or an adhesive component.

[0013] Preferably, the first shell is further provided with a power interface, which is electrically connected to the infrared detector array, the sound sensor array, the ultrasonic generator array and the processing module.

[0014] Preferably, the processing module includes: A positioning unit, used to receive signals from an infrared detector array and fit the position information of a human ear; An audio processing unit, configured to analyze the signal from the sound sensor array and generate an anti-phase sound wave signal opposite to the ambient audio; A control unit is used to determine the delay parameters of the ultrasonic generator array according to the position information of the human ear and the position information of the directional active silencer.

[0015] A directional noise reduction method adopts the above-mentioned directional active noise reducer and comprises the following steps: obtaining position information of a human ear and position information of the directional active noise reducer through an infrared detector array; Collecting ambient audio through a sound sensor array and obtaining frequency domain information of the ambient audio; The processing module generates an inverted sound wave signal based on the frequency domain information of the ambient audio, and obtains the delay parameter of the ultrasonic generator array based on the position information of the human ear and the position information of the directional active silencer; the ultrasonic generator array transmits the inverted sound wave signal according to the delay parameter, and superimposes it with the frequency domain information of the ambient audio at the position of the human ear to complete the silencer process.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention discloses a directional active silencer, which uses an infrared detector array to accurately locate the spatial position of the human ear, and combines with an ultrasonic generator array to emit a focused sound beam, generating only an anti-phase sound wave at the target ear to superimpose and cancel out the ambient noise. The user does not need to wear closed headphones, and the necessary sounds in the environment can be transmitted normally to the ear. Only the noise at a specific location is eliminated, completely breaking the "information island" limitation and effectively solving the problem of information shielding caused by the closed design. In addition, the processing module extracts noise frequency domain information through the sound sensor array, supports setting a reserved frequency band, and only generates an anti-phase signal for the noise in the target frequency band, achieving "noise reduction without silencing". In addition, the infrared detector array set in the directional active silencer includes multiple infrared detectors, which can realize the separate positioning of the user's left and right ears and generate independent sound beams. It can also realize the simultaneous positioning of the ear positions of multiple users, control the ultrasonic array to emit offset sound waves in different areas, and form multiple independent silent areas, effectively realizing precise directional noise reduction in a multi-person environment. Each user only has the noise at his or her own ear position reduced, and the surrounding sound is transmitted normally, realizing "point-to-point precise noise reduction". The directional active silencer comprises a first shell and a second shell. The first shell has a curved surface, while the second shell is a circular plane. The edges of the first shell and the second shell are connected to form a hollow cavity. The infrared detector array, acoustic sensor array, and ultrasonic generator array are evenly spaced on the first shell. The processing module is located within the hollow cavity formed by the first and second shells. The ultrasonic generator array is mounted on the curved surface, and its physical arrangement creates a natural acoustic lens effect. The curved, concave structure actively focuses the ultrasonic energy emitted by the array into a smaller focal area (i.e., the target ear location), significantly increasing the acoustic energy density per unit area. The curved design also helps suppress side lobes (energy leakage in non-primary directions) of sound wave propagation. Lower side lobes mean less sound energy is wasted in non-target areas, reducing interference with the surrounding environment and increasing the intensity of the reversed-phase sound waves in the target area (the ear). The second shell is a circular plane and is used to secure the directional active silencer. The flat circular surface provides a stable mounting base, ensuring the stability of ear position information and the effectiveness of the sound cancellation effect. The edge of the first shell is connected to the edge of the second shell to form a closed hollow cavity, the main function of which is to protect the internal processing module from physical damage and environmental interference, and effectively ensure the stable operation of the processing module.

[0017] Preferably, the infrared detector array includes multiple infrared detectors, which are infrared cameras and infrared ranging sensors. Here, an infrared camera is used as the infrared detector to accurately capture the ear contour through image recognition, which is suitable for stable lighting environments. At the same time, an infrared ranging sensor is used as the infrared detector to calculate the distance through the time of flight principle, and can still locate in dark light or obstructed scenes. The two technologies complement each other to avoid system failure caused by a single fault.

[0018] Preferably, the plurality of infrared detectors are evenly distributed on the first shell, and the positioning accuracy of the infrared detectors is ≤5mm. The even layout eliminates blind spots, tracks the head movement in real time, and ensures that the sound beam continues to focus on the target ear. The positioning accuracy is ≤5mm, so that the error is ≤5mm, which is equivalent to 1 / 4 of the width of the human ear, avoiding the failure of silencing caused by sound beam deviation.

[0019] Preferably, the sound sensor array includes multiple sound sensors, which are evenly spaced on the first shell. The uniform arrangement is combined with a beamforming algorithm, the sound source azimuth resolution is ≤2°, the frequency domain analysis covers 20Hz~20kHz, and the environmental reflected clutter is suppressed through spatial filtering to improve the anti-interference ability.

[0020] Preferably, the ultrasonic generator array includes multiple ultrasonic generators, and the multiple ultrasonic generators are evenly distributed on the first shell. In the present invention, through phase control, the phase difference is adjustable from 0 to 180°, so as to achieve horizontal deflection of the sound beam by ±60° and pitch deflection by ±30°, covering the movement range of the ear and avoiding affecting the surrounding non-noise-reduced areas.

[0021] Preferably, the outer surface of the first shell is provided with a sound-transmitting material to ensure that the ambient noise is transmitted without loss, effectively improving the fidelity of the signal, and the interior of the shell is provided with a sound insulation layer to prevent the ultrasonic generator from self-oscillating.

[0022] Preferably, the second shell is provided with a magnetic base, a threaded interface or an adhesive component, which can be adapted to different application scenarios and has higher flexibility of use.

[0023] Preferably, a power interface is also provided on the first shell, and the power interface is connected to the infrared detector array, the sound sensor array, the ultrasonic generator array and the processing module to meet the usage requirements of different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A top view of the directional active silencer of the present invention; Figure 2 It is a front view of the directional active silencer of the present invention; Figure 3 Schematic diagram of the silencing area of ​​the single-person mode of the directional active silencer of the present invention; Figure 4 A schematic diagram of multi-person mode and multi-zone mute of the directional active silencer of the present invention; Figure 5 This is a flow chart of the working principle of the directional active silencer in the present invention.

[0026] Wherein: 1. noise source, 2. ultrasonic generator array, 21. ultrasonic generator, 3. sound sensor array, 31. sound sensor, 4. infrared detector array, 41. infrared detector, 11. first shell, 12. second shell. DETAILED DESCRIPTION

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0030] In the description of the embodiments of the present invention, it should be noted that if the terms "upper," "lower," "horizontal," "inner," etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the inventive product is typically placed when in use. These terms are merely for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0033] The present invention is described in further detail below with reference to the accompanying drawings: Example 1 like Figures 1 and 2 As shown, the present invention discloses a directional active silencer, comprising a first shell 11 and a second shell 12; the first shell 11 has a curved surface structure, and the second shell 12 has a circular plane; the edge of the first shell 11 is connected to the edge of the second shell 12 to form a sealed hollow cavity; the first shell 11 is evenly spaced with an infrared detector array 4, a sound sensor array 3, and an ultrasonic generator array 2; the infrared detector array 4 is used to obtain position information of the human ear, and the sound sensor array 3 is used to collect ambient audio and obtain frequency domain information of the ambient audio; a processing module is provided within the hollow cavity formed by the first shell 11 and the second shell 12, the processing module is used to generate an inverted sound wave signal based on the frequency domain information of the ambient audio, and obtain a delay parameter of the ultrasonic generator array based on the position information of the human ear and the position information of the directional active silencer. The ultrasonic generator array 2 is used to emit the inverted sound wave signal according to the delay parameter, and superimpose the inverted sound wave signal with the frequency domain information of the ambient audio at the position of the human ear to complete the silencer process, so that the sound pressure level at the target ear approaches zero after superposition.

[0034] The first housing 11 is a curved structure, specifically a portion of a spherical structure, and the second housing 12 is a circular plane. The first housing 11 and the second housing 12 are detachable, and can be detached and installed by means of snaps, bolts, etc. The second housing 12 serves as the bottom surface, i.e., the mounting surface.

[0035] The radius of the first shell 11 is 10 cm, and the diameter of the second shell 12 is 20 cm. The specific ratio of the radius of the curved structure to the diameter of the circular plane, i.e. 1:2, ensures that the sound waves are evenly reflected on the spherical structure, reduces sound beam distortion, and improves focusing accuracy.

[0036] Preferably, the infrared detector array 4 includes a plurality of infrared detectors 41, preferably an infrared camera or an infrared ranging sensor, and the plurality of infrared detectors are evenly distributed on the outer surface of the hemispherical shell, and the three-dimensional coordinates of the human ear are obtained by structured light or time of flight (ToF) technology. , positioning accuracy ≤ 5mm. Here, multiple infrared detectors are evenly distributed to avoid occlusion by human movement, such as turning the head, ensuring continuous positioning in dynamic scenes, such as the changing positions of multiple people in a meeting.

[0037] Preferably, the infrared detector array 4 of the present invention includes five infrared detectors 41, which are evenly distributed on the first shell 11. Preferably, one is set on the top of the first shell 11, and the other four are evenly spaced on the side walls of the first shell 11. At the same time, "ToF sensor" is marked on the infrared detector 41.

[0038] Preferably, the sound sensor array 3 includes a plurality of sound sensors 31, preferably a microphone, more preferably an omnidirectional microphone, and the sound sensor 31 calculates the azimuth angle of the sound source through beamforming technology. Horizontal direction and pitch angle Vertical direction, realize the location information of noise source 1 and extract the frequency, amplitude and phase information of the audio signal; the preferred sound sensor array 3 includes four sound sensors 31.

[0039] Preferably, the noise is decomposed in the frequency domain by Fast Fourier Transform (FFT) to extract the frequency of the ambient noise. , amplitude , Phase , output the frequency domain information of the sound wave ,in, is the complex amplitude, through the amplitude and phase Get, is the frequency, is time, i.e. the moment of dynamic change, reflecting the time-varying nature of the noise signal. Here, the position information of the noise source 1 is used Determine the direction of the noise source through the signal Determine the specific characteristics of the noise and provide a data basis for the subsequent generation of accurate anti-phase sound waves.

[0040] Preferably, the sound sensor array 3 is also evenly distributed on the first housing 11, and "microphone array" is marked on the sound sensor.

[0041] The ultrasonic generator array 2 includes multiple ultrasonic generators 21, which can be multiple high-frequency speakers with an operating frequency range of 20~40kHz. The ultrasonic generator array 2 is distributed in a ring with the normal direction of the hemisphere as the axis. The output phase and amplitude of each ultrasonic generator are controlled in real time by the processing module to form a sound beam directed to the target ear.

[0042] In the present invention, the ultrasonic generator array 2 is used to receive the inverted signal generated by the processing module , that is, the phase difference with the ambient noise is 180°, the digital signal is converted into a high-frequency sound wave, and by adjusting the output phase and amplitude of different ultrasonic generators 21, a focused sound beam pointing to the target ear is formed to avoid interference with the sound field in the non-target area.

[0043] In a preferred setting, multiple ultrasonic generators 21 are evenly distributed in a ring shape on the first shell 11. More preferably, multiple ultrasonic generators 21 are arranged in a ring shape with the hemisphere normal of the first shell 11 as the axis. By adjusting the phase difference of each unit, the deflection angle of the sound beam is controlled to cover the movement range of the target ear.

[0044] The processing module is the central chip of the directional active silencer in the present invention. The processing module includes a positioning unit for receiving the signal of the infrared detector array 4 and fitting the ear position coordinates; an audio processing unit for performing real-time FFT analysis on the signal of the sound sensor array 3 and generating a digital signal that is inversely proportional to the ambient audio, i.e., canceling the sound wave; and a control unit for calculating the delay parameters of each ultrasonic generator in the ultrasonic generator array 2 according to the ear position coordinates and the sound source distance given by the positioning unit, so that the canceling sound wave forms a phase destructive superposition at the target ear.

[0045] The algorithm for generating the cancelling sound wave includes adaptive filtering, such as the LMS algorithm, which tracks changes in ambient audio in real time and dynamically adjusts the output parameters of the ultrasonic generator to ensure that the noise reduction response is completed within 0.1 seconds.

[0046] Further preferably, the outer surface of the first shell 11 is provided with a sound-transmitting material, which can be microporous polyester with a sound transmittance of ≥95% and a sound transmission frequency band of 1 to 40 kHz, ensuring that ambient noise is transmitted without loss, and a sound insulation layer is provided in the hollow cavity formed by the first shell (11) and the second shell (12), which can be a damping silica gel, to avoid self-oscillation of the ultrasonic generator and prevent signal crosstalk of the ultrasonic generator; The spacing between the infrared detectors and the sound sensors meets the spatial resolution requirement, and the spacing between adjacent sensors is ≤5cm.

[0047] The second shell 12 is provided with a magnetic base, a threaded interface or an adhesive component for fixing the directional active silencer to headphones, a helmet, an indoor wall or the interior surface of a vehicle. At the same time, the first shell 11 is also provided with a power interface, which is electrically connected to the infrared detector array (4), the sound sensor array (3), the ultrasonic generator array (2) and the processing module.

[0048] like Figures 3 and 4 As shown, the directional active silencer of the present invention includes two working modes, a single-person mode and a multi-person mode.

[0049] In single-player mode, the left or right ear is positioned separately for a single ear to generate independent canceling sound waves. In single-player mode, the directional active silencer can be fixed on the right side of the helmet, and the right ear position E is located by infrared. The ultrasonic generator forms a sound beam pointing to E, and the amplitude of the original sound wave and the canceling sound wave is zero after superposition at point E.

[0050] Multi-person mode simultaneously receives ear location signals from multiple infrared detector arrays 4, controls the ultrasonic generators in the ultrasonic generator array 2 in separate zones, and creates multiple quiet zones. In multi-person mode, for example, in a conference room environment, a directional active silencer can be installed on the conference room ceiling. Infrared detectors locate the ear positions E1, E2, and E3 of three participants, and the ultrasonic generators emit canceling sound waves in separate zones, creating independent quiet zones at each ear. Sound in non-target areas propagates normally.

[0051] Further preferably, the directional active silencer in the present invention also includes a human-computer interaction module, which is a touch display screen or a voice input unit, used to set the target ear position, select the noise reduction frequency band, such as the dialogue retention frequency band, the noise elimination frequency band, and adjust the range of the quiet area.

[0052] like Figure 5 As shown, the working principle of the directional active silencer in the present invention is: 1. Infrared positioning: The infrared detector array 4 emits structured light to capture the ear contour. The infrared detector array 4 captures the position information of the ear contour and the three-dimensional coordinate information of the ear contour. , right ear .

[0053] 2. Audio acquisition: The sound sensor array 3 receives ambient sound, i.e., noise source 1, and determines the location of the sound waves using beamforming technology. And through FFT analysis, extract the frequency, amplitude and phase information of the audio signal to obtain the frequency domain information of noise source 1 .

[0054] 3. Signal processing: The processing module is based on the frequency domain information Generate an anti-phase acoustic signal , based on the position information of the ear contour or The distance from the muffler is used to calculate the delay of each ultrasonic generator in ultrasonic generator array 2. .

[0055] 4. Sound wave emission: Each ultrasonic generator emits an anti-phase sound wave signal according to the delay parameter ,exist or Place and original sound wave The superposition will cancel out the sound pressure levels, i.e. ΔP≤5dB.

[0056] The present invention uses infrared to locate the ear position and combines it with microphone array sound source positioning to achieve "point-to-point penetration" noise cancellation, forming silence only at the target ear without affecting the surrounding environment, and realizing directional and precise noise reduction. The present invention uses the principle of phase interference cancellation to utilize the ultrasonic generator array 2 to emit anti-phase sound waves with a phase difference of 180° from the ambient noise, which are superimposed with the original noise sound waves at the target ear position, and realize peak and trough cancellation based on the principle of sound wave interference. At the same time, the infrared detector array is controlled to locate the ear with an error of less than 5mm. Combined with beamforming technology, the sound pressure level at the target ear is attenuated by ≥30dB. At the same time, the LMS algorithm is used to track the changes in ambient noise in real time, with a response speed of 0.1 seconds, adapting to complex noise scenes such as traffic noise and mechanical vibration, and realizing dynamic self-adaptation. In addition, it supports noise reduction for one or more people, and can be set to retain specific frequency bands, such as retaining the human voice frequency band of 200Hz-3kHz, to meet the differentiated needs of "noise reduction without silencing" and achieve multi-mode compatibility.

[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A directional active silencer, characterized in that: It comprises a first shell (11) and a second shell (12); the first shell (11) is a curved surface structure, and the second shell (12) is a circular plane; The edge of the first shell (11) is connected to the edge of the second shell (12) to form a closed hollow cavity; An infrared detector array (4), a sound sensor array (3) and an ultrasonic generator array (2) are evenly spaced apart on the first shell (11); The infrared detector array (4) is used to obtain position information of a human ear and position information of a directional active silencer; The sound sensor array (3) is used to collect ambient audio and obtain frequency domain information of the ambient audio; A processing module is provided in the hollow cavity formed by the first shell (11) and the second shell (12), the processing module being used to generate an anti-phase sound wave signal according to the frequency domain information of the ambient audio, and to obtain a delay parameter of the ultrasonic generator array (2) according to the position information of the human ear and the position information of the directional active silencer; The ultrasonic generator array (2) is used to transmit the reverse phase sound wave signal according to the delay parameter, and to cause the reverse phase sound wave signal to be superimposed on the frequency domain information of the ambient audio at the position of the human ear.

2. A directional active silencer according to claim 1, characterized in that: The infrared detector array (4) comprises a plurality of infrared detectors (41), and the infrared detectors (41) are infrared cameras and infrared distance sensors.

3. A directional active silencer according to claim 2, characterized in that: The plurality of infrared detectors (41) are evenly distributed on the first housing (11), and the positioning accuracy of the infrared detectors (41) is ≤5 mm.

4. A directional active silencer according to claim 1, characterized in that: The sound sensor array (3) comprises a plurality of sound sensors (31), and the plurality of sound sensors (31) are evenly distributed on the first housing (11).

5. The directional active silencer according to claim 1, characterized in that: The ultrasonic generator array (2) comprises a plurality of ultrasonic generators (21), and the plurality of ultrasonic generators (21) are evenly distributed on the first shell (11).

6. The directional active silencer according to claim 1, characterized in that: The outer surface of the first shell (11) is provided with a sound-transmitting material, and a sound insulation layer is provided in the hollow cavity formed by the first shell (11) and the second shell (12).

7. The directional active silencer according to claim 1, characterized in that: The second shell (12) is provided with a magnetic base, a threaded interface or an adhesive component.

8. The directional active silencer according to claim 1, characterized in that: The first shell (11) is also provided with a power supply interface, which is electrically connected to the infrared detector array (4), the sound sensor array (3), the ultrasonic generator array (2) and the processing module.

9. The directional active silencer according to claim 1, characterized in that: The processing module includes: A positioning unit, used for receiving signals from the infrared detector array (4) and fitting the position information of the human ear; An audio processing unit, configured to analyze the signal from the sound sensor array (3) and generate an anti-phase sound wave signal opposite to the ambient audio; A control unit is used to determine the delay parameter of the ultrasonic generator array (2) according to the position information of the human ear and the position information of the directional active silencer.

10. A directional noise reduction method, characterized in that: The directional active silencer according to any one of claims 1 to 9 is used, and comprises the following steps: obtaining position information of a human ear and position information of the directional active silencer through an infrared detector array (4); Collecting ambient audio through a sound sensor array (3) and obtaining frequency domain information of the ambient audio; The processing module generates an anti-phase sound wave signal according to the frequency domain information of the ambient audio, and obtains the delay parameter of the ultrasonic generator array (2) according to the position information of the human ear and the position information of the directional active silencer; The ultrasonic generator array (2) emits the anti-phase sound wave signal according to the delay parameter, and superimposes the anti-phase sound wave signal with the frequency domain information of the ambient audio at the position of the human ear to complete the silencing process.

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