Acoustic output device

Abstract

The present description relates to an acoustic output device, comprising: a housing; a bone conduction vibrator, which is used for generating bone-conducted sound waves, the bone-conducted sound waves being transmitted to the cochlea by means of the housing to generate sound; an air conduction vibrator, which is used for generating air-conducted sound waves, the air-conducted sound waves being transmitted to the ear of a user by means of sound guide holes in the housing; and a processing circuit, which is configured to provide a first audio signal for the bone conduction vibrator, and provide a second audio signal for the air conduction vibrator, wherein the processing circuit is further configured to adjust a low-frequency component in the first audio signal or adjust a high-frequency component in the second audio signal. The low-frequency component in the first audio signal or the high-frequency component in the second audio signal are adjusted by means of the processing circuit, such that the ratio of bone-conducted components to air-conducted components in the output of the acoustic output device is variable, so as to adjust high and low frequency output effects of the acoustic output device. Thus, the acoustic output device is suitable for different scenarios, thereby enhancing the use experience of the acoustic output device.

Description

An acoustic output device Technical Field

[0001] This specification relates to the field of acoustic technology, and in particular to an acoustic output device. Background Art

[0002] In bone-air conduction combined acoustic output devices, air conduction transducers generally provide the primary output in the mid- and low-frequency ranges, while bone conduction transducers provide the primary output in the mid- and high-frequency ranges. However, in different usage scenarios, users have different requirements for the output of acoustic output devices.

[0003] Therefore, it is necessary to provide an acoustic output device that adjusts the output of the acoustic output device by setting the components of the input signals of the bone conduction vibrator and the air conduction vibrator to achieve a good auditory experience and make the acoustic output device suitable for different scenarios.

[0004] Summary of the Invention

[0005] One embodiment of the present specification provides an acoustic output device, comprising: a shell; a bone conduction vibrator for generating bone-conducted sound waves, which are transmitted to the cochlea through the shell to produce sound; an air conduction vibrator for generating air-conducted sound waves, which are transmitted to the user's ear through a sound guide hole on the shell; and a processing circuit configured to provide a first audio signal to the bone conduction vibrator and a second audio signal to the air conduction vibrator, wherein the processing circuit is further configured to adjust a low-frequency component in the first audio signal or adjust a high-frequency component in the second audio signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] This specification will be further described in the form of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting, and in these embodiments, like numbers represent like structures, wherein:

[0007] FIG1 is a block diagram of an exemplary acoustic output device according to some embodiments of the present specification;

[0008] FIG2 is an output curve diagram of an exemplary acoustic output device according to some embodiments of the present specification;

[0009] FIG3 is a block diagram of an exemplary processing circuit according to some embodiments of this specification;

[0010] FIG4 is a schematic diagram of an acoustic output device according to some embodiments of the present specification;

[0011] FIG5 is a schematic structural diagram of the connection portion between the core assembly and the ear hook assembly according to some embodiments of this specification;

[0012] FIG6 is a schematic exploded view of the structure of the movement assembly in FIG5 ;

[0013] FIG7 is a schematic diagram of frequency response curves and phase curves of a bone conduction vibrator and an air conduction vibrator according to some embodiments of this specification;

[0014] FIG8 is a schematic diagram of frequency response curves and phase curves of acoustic signals output from two acoustic guide holes coupled to the front and rear cavities of an air conduction oscillator according to some embodiments of this specification;

[0015] FIG9 is a schematic diagram of a curve of a second audio signal obtained after low-pass filtering of different orders according to some embodiments of this specification;

[0016] FIG10 is a schematic diagram of sound leakage curves obtained after filtering with different orders according to some embodiments of this specification;

[0017] FIG11 is a schematic diagram of input signal curves after high-pass filtering of different orders according to some embodiments of this specification;

[0018] FIG. 12 is a schematic diagram of a curve of a first audio signal obtained after high-pass filtering of different orders according to some embodiments of this specification. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the technical solutions of the embodiments of this specification, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of this specification. For ordinary technicians in this field, this specification can also be applied to other similar scenarios based on these drawings without paying any creative work. It should be understood that these exemplary embodiments are provided only to enable technicians in the relevant fields to better understand and implement this specification, and do not limit the scope of this specification in any way. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0020] As used in this specification and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not specifically refer to the singular and may also include the plural, unless the context clearly indicates an exception. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been explicitly identified, and these steps and elements do not constitute an exclusive list. The method or apparatus may also include other steps or elements. The term "based on" means "at least in part based on." The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment."

[0021] In the description of this specification, it should be understood that the terms "front", "rear", "ear hook", "rear hook", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this specification and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on this specification.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout this specification, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0023] In this specification, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this specification based on specific circumstances.

[0024] Some embodiments of this specification also provide an acoustic output device that, through processing circuitry, adjusts the low-frequency components of a first audio signal or the high-frequency components of a second audio signal, thereby enabling a variable ratio of the acoustic output device's output to the high- and low-frequency components. This allows the device to be adapted to different scenarios and enhances the user experience. In some embodiments, the acoustic output device's output can be adjusted to the acoustic output device's high- and low-frequency components by varying the crossover frequency, changing the filter order, and other methods based on various information, such as user input, user environment information, and the audio content being listened to, thereby providing a superior listening experience for the user.

[0025] Some embodiments of this specification provide an acoustic output device that, through processing circuitry and based on a variable crossover frequency, provides a first audio signal to a bone conduction transducer and a second audio signal to an air conduction transducer. By setting a variable crossover frequency, the ratio of bone to air components in the output of the acoustic output device can be adjusted, thereby adjusting the output effect of the acoustic output device, making the acoustic output device suitable for different scenarios and improving the user experience of the acoustic output device.

[0026] Other embodiments of this specification provide an acoustic output device that filters an electrical signal containing sound information by setting a variable order for high-pass or low-pass filtering, thereby obtaining a first audio signal and a second audio signal. By setting a variable order for high-pass or low-pass filtering, the high- and low-frequency output effects of the acoustic output device can be adjusted, making the acoustic output device suitable for different scenarios and enhancing the user experience of the acoustic output device.

[0027] FIG. 1 is a block diagram of an exemplary acoustic output device according to some embodiments of the present specification.

[0028] In some embodiments, the acoustic output device 100 may include a housing 10, a bone conduction vibrator 11, an air conduction vibrator 12, and a processing circuit 120. The housing 10 serves as the main body, providing a mounting and fixing platform for other components (e.g., the bone conduction vibrator 11, the air conduction vibrator 12, the processing circuit 120, etc.). The bone conduction vibrator 11, the air conduction vibrator 12, and the processing circuit 120 may all be located within the housing 10. The bone conduction vibrator 11 is used to provide bone-conducted sound waves to the user, and the air conduction vibrator 12 is used to provide air-conducted sound waves to the user. The processing circuit 120 may provide a first audio signal to the bone conduction vibrator 11 and a second audio signal to the air conduction vibrator 12.

[0029] In some embodiments, the first audio signal and the second audio signal have a crossover frequency. The first audio signal may primarily include signals with frequency components higher than the crossover frequency, and the second audio signal may primarily include signals with frequency components lower than the crossover frequency. For ease of description, signals with frequency components higher than the crossover frequency are referred to as "high-frequency components" or "high-frequency signals," and signals with frequency components lower than the crossover frequency are referred to as "low-frequency components" or "low-frequency signals."

[0030] The bone conduction vibrator 11 refers to a vibrating component that conducts vibrations through a solid medium (e.g., bone) to produce hearing. In some embodiments, the bone conduction vibrator 11 can be used to primarily generate high-frequency bone-conducted sound waves with a frequency above the crossover point. When worn, the bone-conducted sound waves are transmitted to the user's cochlea through the housing 10 to produce sound. Bone-conducted sound waves refer to sound waves conducted through a solid medium (e.g., bone) in the form of mechanical vibrations. Above the crossover point refers to a frequency greater than the frequency corresponding to the crossover point.

[0031] The air-conducting vibrator 12 refers to a vibrating component that produces hearing by conducting vibrations through the air. In some embodiments, the air-conducting vibrator 12 can be used to primarily generate low-frequency air-conducted sound waves with a frequency below the crossover point, and the air-conducted sound waves are transmitted to the user's ears through the sound-conducting holes on the housing 10. Air-conducted sound waves refer to sound waves conducted through the air in the form of mechanical vibrations. For more information about the housing 10 and the sound-conducting holes, please refer to the relevant description below. Here, below the crossover point refers to a frequency less than the frequency corresponding to the crossover point.

[0032] The processing circuit 120 refers to a circuit component that processes signals. In some embodiments, the processing circuit 120 can provide a first audio signal to the bone conduction transducer 11 and a second audio signal to the air conduction transducer 12. In some embodiments, the processing circuit 120 can obtain a high-frequency first audio signal by high-pass filtering the original audio signal, and obtain a low-frequency second audio signal by low-pass filtering the original audio signal. An original audio signal refers to an electrical signal containing a sound signal. In some embodiments, the original audio signal can include audio signals stored internally within the acoustic output device 100 or from a device connected to the outside world. For example, the original audio signal can be an electrical signal obtained from a multimedia platform, terminal device, storage device, etc. In some embodiments, the processing circuit 120 can be further configured to adjust the low-frequency components of the first audio signal or the high-frequency components of the second audio signal, thereby adjusting the high and low frequency output effects of the acoustic output device 100, making the acoustic output device 100 suitable for different scenarios and improving the user experience of the acoustic output device 100. In some embodiments, the processing circuit 120 may provide a first audio signal to the bone conduction vibrator 11 and a second audio signal to the air conduction vibrator 12 based on a crossover frequency point.

[0033] The first audio signal refers to the input signal of the bone conduction vibrator 11. In some embodiments, the first audio signal includes a component with a frequency above a crossover point.

[0034] The second audio signal refers to the input signal of the air conduction oscillator 12. In some embodiments, the second audio signal may include a component with a frequency below a crossover point.

[0035] For ease of understanding, the crossover point refers to the intersection of the first audio signal input to the bone conduction vibrator 11 and the second audio signal input to the air conduction vibrator 12 after being processed by the processing circuit 120 in the frequency domain.

[0036] In some embodiments, the crossover point can be measured in the following manner: connect a lead in parallel with the input end of the bone conduction vibrator 11 and the input end of the air conduction vibrator 12 from the output end of the processing circuit 120, use a sound card and Audition software to record the two sets of electrical signals, and convert them into the frequency domain. The intersection of the curves corresponding to the two sets of electrical signals in the frequency domain is the crossover point.

[0037] FIG2 is an exemplary frequency response curve diagram of the first audio signal and the second audio signal according to some embodiments of this specification. The horizontal axis is the frequency and the vertical axis is the sound pressure level. 21 is the frequency response curve corresponding to the first audio signal, curve L 22 is the frequency response curve corresponding to the second audio signal, curve L 23is the frequency response curve corresponding to the original audio signal, curve L 21 With curve L 22 The intersection O is the frequency division point of the first audio signal and the second audio signal. In some embodiments, the processing circuit 120 can perform high-pass filtering on the original audio signal to obtain the first audio signal, and perform low-pass filtering on the original audio signal to obtain the second audio signal.

[0038] In some embodiments, the crossover point can serve as the cutoff frequency for a high-pass filter or a low-pass filter. After the original audio signal is processed through a low-pass filter, the portion above the cutoff frequency is filtered out, thereby primarily retaining low-frequency components below the cutoff frequency. Similarly, after the original audio signal is processed through a high-pass filter, the portion below the cutoff frequency is filtered out, thereby primarily retaining high-frequency components above the cutoff frequency. In some alternative embodiments, the cutoff frequency of the low-pass filter can be higher than the crossover point, while the cutoff frequency of the high-pass filter can be lower than the crossover point. In some embodiments, the cutoff frequency of the low-pass filter can be lower than the cutoff frequency of the high-pass filter. In this case, the frequency components of the first and second audio signals may or may not overlap. In some embodiments, the cutoff frequency of the low-pass filter can also be higher than the cutoff frequency of the high-pass filter. In this case, the frequency components of the first and second audio signals may overlap. In some embodiments, the crossover point can serve as the cutoff frequency for both the high-pass filter and the low-pass filter. In this case, the cutoff frequency of the low-pass filter is the same as the cutoff frequency of the high-pass filter, resulting in overlapping frequency components of the first and second audio signals.

[0039] In some embodiments, the crossover point is variable, so that the proportion of the bone and air components in the output of the acoustic output device 100 can be variable, thereby adjusting the output effect of the acoustic output device 100, so that the acoustic output device 100 is suitable for different scenarios (for example, gaming scenarios where vibration enhances immersion, call scenarios with better listening effects, noise reduction scenarios with less sound leakage, etc.), thereby improving the user experience of the acoustic output device 100.

[0040] For example, when a user is in a quiet environment (such as a library or exhibition hall) and has a high requirement for sound leakage reduction, the crossover frequency can be set lower to reduce the high-frequency output of the air conduction vibrator 12. This reduces the high-frequency output of the acoustic output device 100 and makes the sound leakage of the acoustic output device 100 less noticeable. For another example, when a user is in a noisy environment and has a lower requirement for sound leakage reduction but a higher output volume of the acoustic output device 100, and considering the high vibration power consumption of the bone conduction vibrator 12, the crossover frequency can be set higher to enable the air conduction vibrator 12 to output louder air-conducted sound at higher frequencies.

[0041] In some embodiments, the order of high-pass filtering / low-pass filtering can be variable to adjust the low-frequency components in the first audio signal or the high-frequency components in the second audio signal, thereby adjusting the output effect of the acoustic output device 100, so that the acoustic output device 100 is suitable for different scenarios and improves the user experience of the acoustic output device 100.

[0042] In some embodiments, the cutoff frequencies of the components used for high-pass and low-pass filtering in the acoustic output device 100 are variable to correspond to the variable crossover frequency. In some embodiments, the acoustic output device 100 may include multiple components for high-pass and low-pass filtering, each with a different cutoff frequency. The acoustic output device 100 can select the appropriate component for filtering based on the adjusted crossover frequency. In some embodiments, the implementation of variable filter order can be similar to the implementation of variable cutoff frequency described above and will not be further described here.

[0043] In some embodiments, the acoustic output device 100 may adjust the crossover frequency point based on a specific scenario.

[0044] A specific scene may refer to a special scene in which a user uses the acoustic output device 100. For example, a specific scene may include a game scene, a call scene, a noise reduction scene (a scene requiring noise reduction, such as a library scene), and the like.

[0045] For example, when the specific scene is a game or movie, the acoustic output device 100 can lower the crossover frequency, allowing the bone conduction vibrator 11 to produce more low-frequency vibrations. When the acoustic output device 100 outputs a specific sound (such as gunshots or thunder in games, videos, audio files, etc.), the acoustic output device 100 can produce a noticeable vibration to stimulate and prompt the user, thereby enhancing the user experience. As an example, in a shooting game, the acoustic output device 100 can lower the crossover frequency, and when the acoustic output device 100 outputs gunshots, it can generate corresponding vibrations to prompt the user. Furthermore, based on gunshots from different directions (such as the right front), the acoustic output device 100 corresponding to the user's wearing part (such as the right ear) can vibrate to indicate the enemy's location to the user, enhancing the user's sense of presence.

[0046] For example, in a specific scenario such as a phone call, the acoustic output device 100 can increase the crossover frequency to reduce the bone-conducted sound waves generated by the bone conduction vibrator 11 at low frequencies, thereby weakening the vibration of the acoustic output device 100 at low frequencies and improving user comfort. Setting a higher crossover frequency can also increase the proportion of air-conducted sound waves in the sound. Because the air load pushed by the air conduction vibrator 12 is relatively small, while the load of the bone conduction vibrator 11 when generating low-frequency vibrations is relatively large, increasing the crossover frequency can effectively reduce power consumption, ensuring that the acoustic output device 100 has a longer battery life even at higher volume levels.

[0047] For another example, when the specific scenario is a noise reduction scenario, the acoustic output device 100 can lower the crossover point so that the air conduction vibrator 12 mainly emits sound at low frequencies and reduces the output of the air conduction vibrator 12 at high frequencies, so that the acoustic output device 100 outputs fewer air-conducted sound waves at high frequencies, and the sound leakage of the acoustic output device 100 is not obvious.

[0048] In some embodiments, the acoustic output device 100 may adjust the crossover frequency point through the processing circuit 120 .

[0049] In some embodiments, the processing circuit 120 may be further configured to: receive a trigger signal, and adjust the low-frequency component in the first audio signal or adjust the high-frequency component in the second audio signal based on the trigger signal.

[0050] In some embodiments, the processing circuit 120 can adjust the low-frequency component in the first audio signal or the high-frequency component in the second audio signal based on the trigger signal by looking up a table, pre-set rules, etc. For example, the table may include different trigger signals and their corresponding adjustment values ​​for the low-frequency component in the first audio signal or the adjustment values ​​for the high-frequency component in the second audio signal, and the processing circuit can directly determine the adjustment result by looking up the table. For another example, the preset rule can be preset based on experience or demand. An exemplary preset rule can be that when the trigger signal is a game scene in a specific scene, the low-frequency component in the first audio signal is increased by a%. The processing circuit can directly determine the adjustment result by the preset rule.

[0051] By setting up the processing circuit 120, a trigger signal can be received, and based on the trigger signal, the low-frequency component in the first audio signal or the high-frequency component in the second audio signal can be adjusted. The ratio of the high-frequency and low-frequency components of the bone conduction output and the air conduction output can be adaptively adjusted according to the trigger signal, so that the acoustic output device 100 is suitable for different scenarios and the user experience is improved.

[0052] In some embodiments, adjusting the low-frequency components in the first audio signal includes enhancing the low-frequency components in the first audio signal that have frequencies below the crossover point. By enhancing the low-frequency components in the first audio signal that have frequencies below the crossover point, the mid- and low-frequency vibrations of bone conduction can be enhanced, providing a better user experience in specific scenarios (e.g., a shooter game in a gaming environment).

[0053] In some embodiments, enhancing low-frequency components in the first audio signal whose frequencies are below a crossover point includes lowering the crossover point. As an example, the first crossover point is adjusted to a second crossover point. Low-frequency components in the frequency band between the second crossover point and the first crossover point (i.e., low-frequency components below the first crossover point and above the second crossover point) are removed by high-pass filtering before adjustment (corresponding to the first crossover point) and retained by high-pass filtering after adjustment (corresponding to the second crossover point). That is, by lowering the first crossover point to the second crossover point, more low-frequency components in the first audio signal whose frequencies are below the first crossover point can be added, thereby enhancing the low-frequency components in the first audio signal whose frequencies are below the first crossover point.

[0054] In some embodiments, the first audio signal is obtained by performing high-pass filtering on an electrical signal containing sound information via a processing circuit; and enhancing low-frequency components in the first audio signal having frequencies below a crossover point includes reducing the order of the high-pass filter. A lower order high-pass filter results in a poorer high-pass filtering effect on the original audio signal, resulting in a greater number of low-frequency components in the first audio signal having frequencies below the crossover point, thereby enhancing the low-frequency components in the first audio signal having frequencies below the crossover point.

[0055] In some embodiments, enhancing low-frequency components in the first audio signal with frequencies below the crossover point may include: merging a second audio signal into the first audio signal, using the second audio signal to supplement and enhance the low-frequency components in the first audio signal with frequencies below the crossover point; or directly providing the original audio signal to the bone conduction vibrator 11. In some embodiments, directly providing the original audio signal to the bone conduction vibrator 11 may be equivalent to setting the order of the high-pass filter to 0.

[0056] In some embodiments, the processing circuit can also attenuate low-frequency components in the first audio signal that are below the crossover frequency. For example, in a call scenario, by increasing the crossover frequency, increasing the order of the high-pass filter, etc., the low-frequency components in the first audio signal that are below the crossover frequency can be attenuated. This allows the bone conduction vibrator 11 to primarily produce high-frequency sound, reducing low-frequency vibrations and improving the user experience.

[0057] As an example, if the first crossover point is adjusted to a second crossover point, low-frequency components in the frequency band between the first and second crossover points (i.e., low-frequency components above the first crossover point and below the second crossover point) will be retained by the high-pass filter before the adjustment (corresponding to the first crossover point), and will be removed by the high-pass filter after the adjustment (corresponding to the second crossover point). In other words, by adjusting the first crossover point to the second crossover point, low-frequency components in the first audio signal with frequencies below the second crossover point can be reduced, thereby attenuating low-frequency components in the first audio signal with frequencies below the second crossover point.

[0058] The higher the order of the high-pass filter, the better the high-pass filtering effect on the original audio signal, and the fewer low-frequency components in the first audio signal with frequencies lower than the crossover point, thereby achieving the attenuation of the low-frequency components in the first audio signal with frequencies lower than the crossover point.

[0059] In some embodiments, adjusting the high-frequency components in the second audio signal includes attenuating high-frequency components in the second audio signal having frequencies above the crossover point. By attenuating high-frequency components in the second audio signal having frequencies above the crossover point, the air-conducted sound waves output by the air-conducting oscillator 12 at mid- and high-frequency levels can be reduced, thereby preventing increased sound leakage caused by failure of the dipole mechanism in the high-frequency band, thereby providing a better user experience in specific scenarios (e.g., phone calls).

[0060] In some embodiments, attenuating high-frequency components in the second audio signal with frequencies above the crossover point includes lowering the crossover point. As an example, the first crossover point is adjusted to be lowered to the second crossover point. High-frequency components in the frequency band between the second crossover point and the first crossover point (i.e., low-frequency components below the first crossover point and above the second crossover point) are retained by low-pass filtering before adjustment (corresponding to the first crossover point) and removed by low-pass filtering after adjustment (corresponding to the second crossover point). That is, by lowering the first crossover point to the second crossover point, high-frequency components in the second audio signal with frequencies above the second crossover point can be reduced, thereby attenuating high-frequency components in the second audio signal with frequencies above the second crossover point.

[0061] In some embodiments, the second audio signal is obtained by low-pass filtering an electrical signal containing sound information by a processing circuit; and attenuating high-frequency components in the second audio signal having frequencies higher than a crossover point includes increasing the order of the low-pass filter. A higher order of the low-pass filter improves the low-pass filtering effect, reduces high-frequency components in the second audio signal having frequencies higher than the crossover point, and thereby attenuates the high-frequency components in the second audio signal having frequencies higher than the crossover point.

[0062] In some embodiments, the processing circuit may also enhance high-frequency components in the second audio signal that are above the crossover frequency. For example, in a high-noise scenario, the processing circuit may enhance the high-frequency components of the second audio signal that are above the crossover frequency by reducing the order of the low-pass filter or increasing the crossover frequency. This increases the high-frequency components of the air conduction oscillator, improves the output performance of the acoustic output device 100, and reduces the power consumption of the acoustic output device 100.

[0063] As an example, if the first crossover frequency point is adjusted to a second crossover frequency point, the high-frequency components in the frequency band between the second crossover frequency point and the first crossover frequency point (i.e., low-frequency components above the first crossover frequency point and below the second crossover frequency point) will be removed by low-pass filtering before the adjustment (corresponding to the first crossover frequency point), but will be retained by low-pass filtering after the adjustment (corresponding to the second crossover frequency point). In other words, by adjusting the first crossover frequency point to the second crossover frequency point, the high-frequency components in the second audio signal with frequencies above the first crossover frequency point can be reduced, thereby attenuating the high-frequency components in the second audio signal with frequencies above the first crossover frequency point.

[0064] The lower the order of the low-pass filter, the worse the effect of the low-pass filter, and the more high-frequency components with frequencies higher than the crossover point in the second audio signal, thereby enhancing the high-frequency components with frequencies higher than the crossover point in the second audio signal.

[0065] For more information about adjusting the crossover point and filter order, please refer to the relevant description below.

[0066] FIG3 is a block diagram of an exemplary processing circuit according to some embodiments of this specification. Referring to FIG3 , in some embodiments, processing circuit 120 may include an adjustment module 120-1, a detection module 120-2, and a filtering module 120-3. Adjustment module 120-1 may identify a trigger signal and adjust the crossover frequency or filter order, etc. Detection module 120-2 may be used to detect external input and generate a trigger signal. Filter module 120-3 may filter the original audio signal based on the crossover frequency and filter order determined by adjustment module 120-1.

[0067] In some embodiments, the trigger signal can be detected by the detection module 120-2 and input into the adjustment module 120-1. The trigger signal may include information on the crossover point adjustment or the filter order adjustment. The adjustment module 120-1 can make corresponding adjustments to the crossover point or the filter order based on different trigger signals. In some embodiments, the trigger signal can directly include relevant adjustment information, and the adjustment module 120-1 can make adjustments directly according to the relevant adjustment information. In some embodiments, the trigger signal may not include specific adjustment information, and the adjustment module 120-1 may determine the adjustment information based on a preset corresponding relationship. The preset corresponding relationship may be pre-stored in the acoustic output device 100 (such as the adjustment module 120-1) or manually input.

[0068] In some embodiments, the trigger signal can be input by the user. That is, the detection module 120-2 can directly detect the information input by the user (such as specific operation instructions, etc.) to determine the trigger signal. Based on the specific operation instructions input by the user (such as raising and lowering the volume, adjusting the working mode, etc.), the detection module 120-2 can generate a corresponding trigger signal, and the adjustment module 120-1 makes corresponding adjustments after identifying the corresponding trigger signal. Exemplarily, based on the specific working mode selected by the user (such as vibration mode, etc.), the acoustic output device 100 can enhance the low-frequency component in the first audio signal to enhance the low-frequency vibration; accordingly, the trigger information can correspond to lowering the crossover point, and the processing circuit 120 (such as the adjustment module 120-1) can lower the crossover point. In some embodiments, the input method of the specific operation instruction may include but is not limited to key button input, specific gesture (such as sliding, tapping, etc.) input, voice input, etc.

[0069] In some embodiments, the trigger signal is generated based on the recognition of sound content by the acoustic output device 100 (e.g., detection module 120-2, etc.) or a processing device connected to the acoustic output device 100. In some embodiments, the acoustic output device 100 (e.g., detection module 120-2, etc.) or a processing device connected to the acoustic output device 100 can identify the sound content using a machine learning model, algorithm, etc., and generate a trigger signal in response to the recognition result of the sound content. The sound content may refer to the relevant sound information output by the acoustic output device 100. The recognition result of the sound content may refer to information data related to the sound content. For example, the sound type (e.g., gunshot, etc.), sound characteristics (e.g., volume parameters, etc.), etc. For example, when the acoustic output device 100 (e.g., the detection module 120-2, etc.) or a processing device connected to the acoustic output device 100 identifies the sound type as a gunshot, the acoustic output device 100 can enhance the low-frequency component in the first audio signal to enhance the low-frequency vibration and provide a vibration sensation to the user; accordingly, the trigger information can correspond to lowering the crossover point, and the processing circuit 120 (e.g., the adjustment module 120-1) can lower the crossover point according to the trigger information.

[0070] In some embodiments, the trigger signal can be generated based on the recognition of the surrounding environment by the acoustic output device 100 (e.g., detection module 120-2) or a processing device connected to the acoustic output device 100. In some embodiments, the acoustic output device 100 (e.g., detection module 120-2) or a processing device connected to the acoustic output device 100 can identify the surrounding environment using a machine learning model, algorithm, etc., and generate a trigger signal in response to the recognition result of the surrounding environment meeting a preset condition. The surrounding environment can refer to the environment in which the user is using the acoustic output device 100. The recognition result of the surrounding environment can refer to information data related to the surrounding environment, such as the environment type (e.g., low-noise environment, etc.). Exemplarily, when the acoustic output device 100 (e.g., the detection module 120-2, etc.) or a processing device connected to the acoustic output device 100 identifies that the environment type is a low-noise environment, the acoustic output device 100 can weaken the high-frequency components in the second audio signal to reduce sound leakage; accordingly, the trigger information can correspond to lowering the crossover point, and the processing circuit 120 (e.g., the adjustment module 120-1) can lower the crossover point according to the trigger information.

[0071] In some embodiments, the filtering module 120-3 can filter the original audio signal using hardware, software (algorithm), or a combination thereof. For example, the filtering module 120-3 can filter a signal using circuits and / or algorithms. In some embodiments, the hardware can include, but is not limited to, an equalizer (EQ), a dynamic range controller (DRC), a phase processor (GAIN), and the like.

[0072] In some embodiments, the original audio signal may be filtered in the filtering module 120 - 3 to obtain a first audio signal and / or a second audio signal. The first audio signal and / or the second audio signal may include a specific frequency.

[0073] In some embodiments, one or more filters or filter groups may be provided to process the original audio signal in the filtering module 120-3 to obtain one or both of the first audio signal and the second audio signal. Exemplary filters or filter groups may include, but are not limited to, analog filters, digital filters, passive filters, active filters, etc., or a combination thereof. For example, the filtering module 120-3 includes a high-pass filter and a low-pass filter. The filtering module 120-3 may perform high-pass filtering on the original audio signal to obtain the first audio signal, and may perform low-pass filtering on the original audio signal to obtain the second audio signal.

[0074] By adjusting the relevant parameters through the processing circuit 120 (filter module 120-3), the scoring frequency point or the filter order can be made variable, thereby adjusting the output effect of the acoustic output device 100, making the acoustic output device 100 suitable for different scenarios, and improving the user experience of the acoustic output device 100.

[0075] It will be appreciated that the bone conduction vibrator 11 and the air conduction vibrator 12 can be electrically coupled to the filtering module 120-3. The bone conduction vibrator 11 can generate bone-conducted sound waves within a specific frequency range (e.g., a high frequency range) based on the first audio signal processed by the filtering module 120-3. The air conduction vibrator 12 can generate air-conducted sound waves within a specific frequency range (e.g., a low frequency range) based on the second audio signal processed by the filtering module 120-3. In some embodiments, the bone conduction vibrator 11 and the air conduction vibrator 12 can be two independent functional devices, or two independent components of a single device. As described herein, the first device is independent of the second device, meaning that the operation of the first / second device is not caused by the operation of the second / first device, or in other words, the operation of the first / second device is not the result of the operation of the second / first device. Taking the bone conduction vibrator 11 and the air conduction vibrator 12 as an example, the air conduction vibrator 12 is independent of the bone conduction vibrator 11 because each of the two vibrators is independently driven by an electrical signal to generate sound waves.

[0076] In some embodiments, different frequency ranges can be determined according to actual needs. For example, the low frequency range (also referred to as low frequency) can refer to a frequency range from 20Hz to 150Hz, the medium frequency range (also referred to as medium frequency) can refer to a frequency range from 150Hz to 5kHz, the high frequency range (also referred to as high frequency) can refer to a frequency range from 5kHz to 20kHz, the medium-low frequency range (also referred to as medium-low frequency) can refer to a frequency range from 150Hz to 500Hz, and the medium-high frequency range (also referred to as medium-high frequency) can refer to a frequency range from 500Hz to 5kHz. For another example, the low frequency range can refer to a frequency range from 20Hz to 200Hz, the medium frequency range can refer to a frequency range from 200Hz to 3kHz, the high frequency range can refer to a frequency range from 3kHz to 20kHz, the medium-low frequency range can refer to a frequency range from 100Hz to 1000Hz, and the medium-high frequency range can refer to a frequency range from 1000Hz to 10kHz. It should be noted that the values ​​of the frequency ranges are for illustrative purposes only and are not limiting. The definitions of the above frequency ranges can vary according to different application scenarios and different classification standards. For example, in some other application scenarios, the low frequency range may refer to a frequency range from 20 Hz to 80 Hz, the medium frequency range may refer to a frequency range from 160 Hz to 1280 Hz, the high frequency range may refer to a frequency range from 2560 Hz to 20 kHz, the mid-low frequency range may refer to a frequency range from 80 Hz to 160 Hz, and the mid-high frequency range may refer to a frequency range from 1280 Hz to 2560 Hz. Optionally, different frequency ranges may or may not have overlapping frequencies.

[0077] FIG. 4 is a schematic diagram of an acoustic output device according to some embodiments of the present specification.

[0078] In some embodiments, as shown in FIG. 4 , the acoustic output device 100 may include a core component 1 , an ear hook component 2 , and a back hook component 3 .

[0079] In some embodiments, the number of movement components 1 is two, wherein the two movement components 1 are used to transmit vibration and / or sound to the left ear and right ear of the user respectively, and the two movement components 1 may be the same or different. For example, one movement component 1 may be provided with a microphone, while the other movement component 1 may not be provided with a microphone; for another example, one movement component 1 may be provided with a button and a corresponding circuit board, while the other movement component 1 may not be provided with the button and the corresponding circuit board. The two movement components 1 may be the same in the movement module (such as a speaker module). This application will be described in detail later by taking one of the two movement components 1 as an example.

[0080] In some embodiments, there may be two ear hook components 2, and the two ear hook components 2 may be respectively hung on the left ear and the right ear of the user, so that the core component 1 can fit the user's face. A battery may be provided at one ear hook component 2, and a control circuit may be provided at the other ear hook component 2. One end of the ear hook component 2 is connected to the core component 1, and the other end of the ear hook component 2 is connected to the back hook component 3. The back hook component 3 connects the two ear hook components 2, and the back hook component 3 is used to wrap around the back of the user's neck or the back of the head, and can provide a clamping force, so that the two core components 1 are clamped on both sides of the user's face and the ear hook components 2 are more firmly hung on the user's ears.

[0081] In some embodiments, the acoustic output device 100 may not include a rear-hanging component 3. For example, the acoustic output device 100 may include a core component 1 and an earhook component 2. One end of the earhook component 2 may be connected to the core component 1, and its other end may extend along the junction of the user's ear and head. In some embodiments, the earhook component 2 may have an arc-shaped structure that adapts to the user's auricle, so that the earhook component 2 is suspended from the user's auricle. For example, the earhook component 2 may have an arc-shaped structure that adapts to the junction of the user's head and ear, so that the earhook component 2 can be hung between the user's auricle and head. In some embodiments, the earhook component 2 may also have a clamping structure that adapts to the user's auricle, so that the earhook component 2 can be clamped to the user's auricle. For example, the earhook component 2 may include a hook-shaped portion and a connecting portion connected in sequence. The connecting portion connects the hook-shaped portion to the core component 1, so that the acoustic output device 100 is curved in three-dimensional space when it is not worn (i.e., in its natural state). In other words, in three-dimensional space, the hook portion, the connecting portion, and the core assembly 1 are not coplanar. With this arrangement, when the acoustic output device 100 is in a worn state, the hook portion can be primarily used to hang between the back of the user's ear and the head, and the core assembly 1 can be primarily used to contact the front of the user's ear or the user's head, thereby allowing the core assembly 1 and the hook portion to cooperate to be clamped on the ear. For example, the connecting portion can extend from the head toward the outside of the head, thereby cooperating with the hook portion to provide a pressing force on the front of the ear for the core assembly 1. Specifically, under the action of the pressing force, the core assembly 1 can be pressed against the user's skin, so that the acoustic output device 100 does not block the external auditory canal of the ear when the acoustic output device 100 is in a worn state.

[0082] In some embodiments, the acoustic output device 100 may not include the ear-hook component 2 and the back-hook component 3, but may include other fixed structures, and the core component 1 is fixed to the fixed structure so that the core component 1 is fitted to the user's ear, head or other parts through the fixed structure to transmit the air-conducted sound waves and / or bone-conducted sound waves output by the core component 1 to the user. For example, the fixed structure can be a head-mounted structure, which connects the left and right core components 1 to form a head-mounted acoustic output device. For another example, the fixed structure is a bracket for glasses, and the core component is fixed to the bracket for glasses. For another example, the fixed structure can also be a helmet, a mask, or other structures, which are not specifically limited here.

[0083] Figure 5 is a schematic diagram of the connection between the core assembly and the ear hook assembly according to some embodiments of this specification. Figure 6 is an exploded schematic diagram of the core assembly structure in Figure 5. As shown in Figures 5 and 6, the core assembly 1 includes a housing 10, a bone conduction vibrator 11, and an air conduction vibrator 12.

[0084] In some embodiments, the housing 10 is provided with a first accommodating chamber 1001 and a second accommodating chamber 1002, which are isolated from each other. The first accommodating chamber 1001 is more airtight than the second accommodating chamber 1002. A bone conduction vibrator 11 is disposed within the first accommodating chamber 1001, and an air conduction vibrator 12 is disposed within the second accommodating chamber 1002. The acoustic output device 100 utilizes the bone conduction vibrator 11 and the air conduction vibrator 12 to operate in conjunction with each other. The air conduction vibrator 12 is configured to generate air-conducted sound waves and transmit them to the user's ear through the sound guide holes in the housing 10, allowing the user to receive air-conducted sound. The bone conduction vibrator 11 is configured to generate bone-conducted sound waves and transmit them through the housing 10 to the user's cochlea to produce bone-conducted sound. In some embodiments, the first accommodating chamber 1001 is configured as a completely sealed chamber, and the second accommodating chamber 1002 is configured as a chamber with a high degree of airtightness while ensuring sound production by the air conduction vibrator 12. By independently arranging the bone conduction vibrator 11 and the air conduction vibrator 12 in this manner, the sealing effect of the bone conduction vibrator 11 can be effectively improved, thereby preventing damage to the bone conduction vibrator 11 by external environmental factors, while also ensuring the sound quality of the air conduction vibrator 12. Furthermore, when the bone conduction vibrator 11 and the air conduction vibrator 12 of the acoustic output device 100 are operating simultaneously, the bone conduction vibrator 11 and the air conduction vibrator 12 are respectively arranged in the first accommodating cavity 1001 and the second accommodating cavity 1002, effectively preventing mutual interference between the bone conduction vibrator 11 and the air conduction vibrator 12, thereby effectively improving the sound quality of the acoustic output device 100.

[0085] In some embodiments, continuing to refer to Figures 2 and 3, the shell 10 includes a first shell 101, a second shell 102 and a third shell 103. The first shell 101 and the second shell 102 cooperate with each other to form a first accommodating cavity 1001. The first shell 101 and / or the second shell 102 further form a part of the second accommodating cavity 1002. The third shell 103 cooperates with the first shell 101 and / or the second shell 102 to form another part of the second accommodating cavity 1002. In some embodiments, the shell 10 can be composed of a first shell 101, a second shell 102 and a third shell 103 that cooperate with each other, wherein the first shell 101 and the second shell 102 cooperate to form a first accommodating cavity 1001, and the first shell 101 can be provided with a part of the second accommodating cavity 1002, and the third shell 103 cooperates with the first shell 101 to form another part of the second accommodating cavity 1002. The shell 10 is composed of the first shell 101, the second shell 102 and the third shell 103 of the above structure that cooperate with each other, which can make the structure of the movement assembly 1 compact while also being beneficial to the assembly of the movement assembly 1, so as to improve the assembly efficiency of the movement assembly 1. In some embodiments, a portion of the second accommodating cavity 1002 may be provided in the second housing 102, and the third housing 103 and the second housing 102 cooperate to form another portion of the second accommodating cavity 1002. Alternatively, a portion of the second accommodating cavity 1002 may be formed by the cooperation of the first housing 101 and the second housing 102, and the third housing 103 and the first housing 101 and the second housing 102 cooperate to form another portion of the second accommodating cavity 1002. The housing 10 implemented by any of the above embodiments can make the structure of the movement assembly 1 compact while facilitating the assembly of the movement assembly 1, thereby improving the assembly efficiency of the movement assembly 1.

[0086] In some embodiments, a partition wall 1012 is provided within the housing 10 for separating the first accommodating cavity 1001 from the second accommodating cavity 1002. In some embodiments, the partition wall 1012 can be provided on the first housing 101 and / or the second housing 102. The first housing 101 and the second housing 102 cooperate with each other to form the first accommodating cavity 1001. The first housing 101 and / or the second housing 102 further form a portion of the second accommodating cavity 1002. The third housing 103 cooperates with the first housing 101 and / or the second housing 102 to form another portion of the second accommodating cavity 1002. The provision of the partition wall 1012 on the first housing 101 and / or the second housing 102 can be understood as the partition wall 1012 being part of the first housing 101 and / or the second housing 102. The first housing 101 and / or the second housing 102 further form a portion of the second accommodating cavity 1002, and the third housing 103 cooperates with the first housing 101 and / or the second housing 102 to form another portion of the second accommodating cavity 1002. Of course, the partition wall 1012 is not limited to being disposed on the first housing 101 and / or the second housing 102. In other embodiments, the partition wall 1012 may also be a component independent of the first housing 101 and / or the second housing 102. In some embodiments, a partition wall 1012 is provided on the first shell 101, and the first shell 101 is provided with a first sub-accommodating chamber 1010 and a second sub-accommodating chamber 1011 located on opposite sides of the partition wall 1012. The opening direction of the first sub-accommodating chamber 1010 is arranged along the wall surface of the partition wall 1012, and the opening direction of the second sub-accommodating chamber 1011 is arranged to cross the wall surface of the partition wall 1012. The second shell 102 is provided with a third sub-accommodating chamber 1020, and the second shell 102 is covered on the open end of the first sub-accommodating chamber 1010. The third sub-accommodating chamber 1020 cooperates with the first sub-accommodating chamber 1010 to form the first accommodating chamber 1001; the third shell 103 is provided with a fourth sub-accommodating chamber 1030, and the third shell 103 is covered on the open end of the second sub-accommodating chamber 1011. The fourth sub-accommodating chamber 1030 cooperates with the second sub-accommodating chamber 1011 to form the second accommodating chamber 1002.

[0087] In some embodiments, the vibration direction of the bone conduction vibrator 11 is arranged to intersect with the vibration direction of the air conduction vibrator 12. The first housing 101 and the second housing 102 cooperate with each other along the vibration direction of the bone conduction vibrator 11, and the third housing 103 cooperates with the first housing 101 and / or the second housing 102 along the vibration direction of the air conduction vibrator 12. Specifically, the vibration direction of the bone conduction vibrator 11 is arranged to intersect with the vibration direction of the air conduction vibrator 12. The vibration direction of the bone conduction vibrator 11 is hereinafter referred to as the first vibration direction X1, and the vibration direction of the air conduction vibrator 12 may be referred to as the second vibration direction X2. The first vibration direction X1 and the second vibration direction X2 are not parallel to each other but are arranged to intersect with each other. For example, they are arranged perpendicularly or approximately perpendicularly (for example, 90°±10°). When the bone conduction vibrator 11 and the air conduction vibrator 12 are operating simultaneously, the bone conduction vibrator 11 and the air conduction vibrator 12 vibrate in the first vibration direction X1 and the second vibration direction X2, respectively. Since the vibration directions of the two are arranged crosswise, the impact of the vibration of the bone conduction vibrator 11 on the sound quality of the air conduction vibrator 12 caused by the two vibrating in the same direction can be effectively alleviated. Furthermore, the first shell 101 and the second shell 102 are assembled together along the first vibration direction X1, and the third shell 103 is assembled with the first shell 101 along the second vibration direction X2. For example, only the first shell 101 and the third shell 103 can be assembled together to form the second accommodating cavity 1002, and the third shell 103 only has a mating relationship with the first shell 101 along the second vibration direction X2. Similarly, in other embodiments of the shell 10, the third shell 103 should have a mating relationship with the shells that participate in forming the second accommodating cavity 1002 along the second vibration direction X2. This method is conducive to the assembly of the movement assembly 1, thereby improving the assembly efficiency of the movement assembly 1.

[0088] It should be noted that Figures 4-6 above are merely exemplary illustrations of some embodiments of the acoustic output device 100 and do not constitute a limitation. The acoustic output device 100 may also take other forms having acoustic output functions, including but not limited to acoustic glasses, headphones, open-back headphones, etc.

[0089] FIG7 is a schematic diagram of the frequency response curves and phase curves of the bone conduction vibrator and the air conduction vibrator according to some embodiments of the present specification. Curve 71 is the frequency response curve of the air conduction vibrator 12, and curve 73 is the phase curve of the air conduction vibrator 12; curve 72 is the frequency response curve of the bone conduction vibrator 11, and curve 74 is the phase curve of the bone conduction vibrator 11. As shown in FIG7 , the bone conduction vibrator 11 has a first resonance peak 721 at a first resonance frequency (e.g., 250 Hz), and its first high-frequency resonance peak is above 7000 Hz. The air conduction vibrator 12 has a second resonance peak 611 at a second resonance frequency (e.g., 300 Hz), and has a third resonance peak 712 (i.e., the first high-frequency resonance peak of the air conduction vibrator 12) at a third resonance frequency (e.g., 4200 Hz).

[0090] In some embodiments, the first resonant frequency corresponds to the resonant frequency of the bone conduction vibrator 11, and the second resonant frequency corresponds to the resonant frequency of the air conduction vibrator 12. Referring to FIG6 , the air conduction vibrator 12 is disposed in the second accommodating chamber 1002, and the first sound guide hole 1080 and the second sound guide hole 1081 connect the second accommodating chamber 1002 to the external environment. In some embodiments, the air conduction vibrator 12 includes a diaphragm, which divides the second accommodating chamber 1002 into a rear chamber and / or a front chamber located on opposite sides of the diaphragm. The rear chamber is located on the side of the diaphragm facing away from the partition wall 1012, and the front chamber is located between the diaphragm and the partition wall 1012. The first sound guide hole 1080 is connected to the rear chamber, and the second sound guide hole is connected to the front chamber. When the diaphragm vibrates along the air conduction vibration direction X2, the front chamber can be depressurized through the second sound guide hole 1081. The front chamber or the rear chamber can form a third resonant peak 712 having a third resonant frequency.

[0091] As can be seen from Figure 7, in the frequency response curve 72 of the bone conduction vibrator 11, the phase of the bone conduction signal corresponding to the first resonance peak 721 and its corresponding first high-frequency resonance peak is relatively stable; in the frequency response curve 71 of the air conduction vibrator 12, the phase of the air conduction signal corresponding to the second resonance peak 711 and the third resonance peak 712 (its corresponding first high-frequency resonance peak) is relatively stable.

[0092] In some embodiments, in order to ensure that the bone-conducted sound waves and air-conducted sound waves generated by the acoustic output device 100 in a frequency band near the crossover point have a mutually reinforcing effect on the user's cochlea, it is necessary to ensure that the phases of the bone-conducted sound waves and the air-conducted sound waves within this frequency band are the same or substantially the same. In this case, the crossover point of the first audio signal and the second audio signal can be located within the frequency band corresponding to the frequency band with relatively stable phases in the frequency response of the bone conduction vibrator 11 and the air conduction vibrator 12. This allows the effects of the bone-conducted sound waves and the air-conducted sound waves on the user's cochlea to be in phase and reinforce each other, thereby improving the user's listening experience. Specifically, the crossover point can be no less than the first resonant frequency and the second resonant frequency, that is, the crossover point can be no less than the larger of the first resonant frequency and the second resonant frequency. For example, the crossover point can be no less than 300 Hz. In addition, the crossover point may not be greater than the first high-frequency resonant frequency of the bone conduction vibrator 11 and the first high-frequency resonant frequency of the air conduction vibrator 12 (i.e., the third resonant frequency), that is, the crossover point may not be greater than the smaller of the first high-frequency resonant frequency of the bone conduction vibrator 11 and the first high-frequency resonant frequency of the air conduction vibrator 12 (i.e., the third resonant frequency), for example, the crossover point may not be greater than 4200 Hz.

[0093] As shown in Figure 7, when the bone conduction vibrator 11 vibrates within a frequency range near its resonant frequency (the first resonant frequency, e.g., 250 Hz), it produces a strong vibration sensation on the user's face. As the frequency of the bone-conducted sound waves output by the bone conduction vibrator 11 increases, the vibration sensation gradually weakens. For example, the bone conduction vibrator 11 produces a strong vibration sensation (e.g., a slapping sensation) within the range of 150 Hz to 300 Hz, a weaker vibration sensation (e.g., a tingling sensation) within the range of 300 Hz to 400 Hz, and a relatively mild vibration sensation between 400 Hz and 600 Hz. If the crossover frequency is set too low, causing the first audio signal to include a frequency range near the first resonant frequency, the bone conduction vibrator 11 will produce more low-frequency vibrations. In this case, even if the order of the high-pass filter is increased, the effect will be extremely limited (there will still be a lot of low-frequency vibration above the cutoff point, i.e., the crossover frequency). Therefore, in order to avoid the resonance peak of the bone conduction vibrator 11, the bone conduction output range can be no less than the first resonance frequency, and the corresponding crossover point can be no less than the first resonance frequency (for example, 250Hz), so as to avoid the output frequency of the bone conduction vibrator 12 being too low, causing the bone conduction vibrator 12 to produce too strong a vibration feeling, thereby giving the user a poor user experience.

[0094] As can be seen from FIG7 , for the frequency response curve 71 of the air conduction oscillator 12 , the portion between the second resonance peak 711 and the third resonance peak 712 is relatively flat. To stabilize the output of the air conduction oscillator 12 , the output range of the air conduction oscillator 12 may be no less than the second resonance frequency (e.g., 300 Hz) to ensure the output performance of the air conduction oscillator 12 .

[0095] In some embodiments, to ensure that the air conduction vibrator 12 has good output performance while preventing the bone conduction vibrator 11 from generating excessive low-frequency vibrations, the crossover frequency may be no less than 300 Hz. In some embodiments, to further reduce the vibration sensation generated by the bone conduction vibrator 11, the crossover frequency may be no less than 350 Hz. In some embodiments, to further ensure the output performance of the air conduction vibrator 12, the crossover frequency may be no less than 400 Hz.

[0096] In some embodiments of this specification, by making the crossover point no less than 300 Hz, the bone conduction vibrator is prevented from generating more low-frequency vibrations, thereby avoiding excessive vibration that gives the user a poor experience, and ensuring the low-frequency performance of the acoustic output device.

[0097] FIG8 is a schematic diagram of frequency response curves and phase curves of acoustic signals output from two acoustic holes coupled to the front and rear cavities of an air conduction oscillator according to some embodiments of this specification.

[0098] Referring to Figure 8 , curve 81 is the frequency response curve of the first sound-conducting hole, curve 83 is the phase curve of the first sound-conducting hole, curve 82 is the frequency response curve of the second sound-conducting hole, and curve 84 is the phase curve of the second sound-conducting hole. As shown in Figure 8 , the amplitudes of the frequency response curves of the two sound-conducting holes are essentially the same (corresponding to curves 81 and 82), with an amplitude deviation of approximately ±6 dB. The phase difference between the two sound-conducting holes is 180° (or nearly 180°). After the third resonance peak 811 corresponding to the third resonant frequency, the number of vibration modes on frequency response curves 81 and 82 increases. Correspondingly, phase jumps become frequent, and the two sound-conducting holes cannot stably maintain a phase difference of 180° (or nearly 180°), rendering the sound leakage reduction mechanism ineffective. This results in a weakened effect of the dipole formed by the air-conducting oscillator through the two sound-conducting holes, failing to effectively reduce sound leakage. On the other hand, as shown in Figure 7 , the frequency response curve 71 of the air-conducting oscillator 12 is relatively flat between the second resonance peak 711 and the third resonance peak 712. Therefore, in some embodiments, based on the above considerations, in order to avoid the frequency band in which the air-conducting vibrator 12 has a complex vibration mode, while ensuring that the air-conducting vibrator 12 has better output performance, the output range of the air-conducting vibrator 12 may not be greater than the third resonant frequency (for example, 4200 Hz), that is, the frequency crossover point may not be greater than the third resonant frequency (for example, 4200 Hz).

[0099] In some embodiments, to ensure the sound leakage reduction effect and output performance of the air conduction oscillator 12, the crossover frequency may be no higher than 3000 Hz. In some embodiments, to further ensure the sound leakage reduction effect of the air conduction oscillator, the crossover frequency may be no higher than 2500 Hz. In some embodiments, to further ensure the output performance of the air conduction oscillator, the crossover frequency may be no higher than 2000 Hz.

[0100] FIG. 9 is a schematic diagram of a curve of a second audio signal obtained after low-pass filtering of different orders according to some embodiments of this specification.

[0101] As shown in FIG9 , the five curves 91, 92, 93, 94, and 95 are second audio signal curves obtained by low-pass filtering the original audio signal using low-pass filters of order 4, 8, 16, 32, and 64, respectively. For ease of comparison, the cutoff frequency of the low-pass filters of each order is 2 kHz, and the corresponding crossover point can also be 2 kHz.

[0102] The order of a filter is a parameter that reflects its ability to filter signals. For example, for high-pass and low-pass filters, the order is the sum of the number of capacitors and inductors in the filter. For bandpass filters, the order is the total number of parallel resonators. For bandstop filters, the order is the total number of series and parallel resonators.

[0103] The higher the order of the low-pass filter, the smaller the portion of the second audio signal obtained after filtering above the cutoff frequency, the less high-frequency vibration the air conduction vibrator 12 can produce after the cutoff frequency, and the less high-frequency sound leakage.

[0104] As shown in Figure 9, before the cutoff frequency, curves 91, 92, 93, 94, and 95 roughly overlap. After the cutoff frequency, curves 91, 92, 93, 94, and 95 all show a downward trend. Furthermore, after the cutoff frequency, from curve 91 to curve 95, the larger the order, the steeper the corresponding curve, the faster the corresponding curve decreases, and the larger the absolute value of the slope of the curve. In other words, the larger the filter order, the better the filtering effect on the signal.

[0105] In some embodiments, the slope of the curve can be obtained by sampling and calculating the second audio signal curve. For a specific calculation method, see FIG12 and its related description.

[0106] FIG. 10 is a schematic diagram of sound leakage curves obtained after filtering processes of different orders according to some embodiments of this specification.

[0107] Curve 104, which corresponds to curve 91 in Figure 9 , is the sound leakage curve for the second audio signal after 4th-order filtering. Curve 105, which corresponds to curve 92 in Figure 9 , is the sound leakage curve for the second audio signal after 8th-order filtering. As in Figure 9 , the cutoff frequency of each order low-pass filter in Figure 10 is 2 kHz, and the corresponding crossover frequency can also be 2 kHz. As shown in Figure 10 , curves 104 and 105 are positioned relatively low in the vocal range (before 2 kHz), indicating that the sound leakage before the cutoff frequency is relatively low for both 4th-order and 8th-order filtered second audio signals. Curve 104 for 4th-order filtering has a resonant peak near 4 kHz, while curve 105 for 8th-order filtering is significantly lower than curve 104 and flatter near the frequency corresponding to this resonant peak. This is because when the crossover frequency is high (for example, 2 kHz), the second audio signal after 4th-order low-pass filtering has more high-frequency components above the crossover frequency, while the second audio signal after 8th-order low-pass filtering has fewer high-frequency components above the crossover frequency. This means that when the crossover point is higher, the order of the low-pass filter is higher, and the air conduction oscillator 12 can generate less high-frequency air conduction sound above the cutoff frequency.

[0108] Figure 11 is a schematic diagram of input signal curves processed by high-pass filters of different orders according to some embodiments of this specification. Curve 1101 represents the input signal curve when the original audio signal is a white noise signal. The corresponding order can be considered to be 0th order, which is represented by a horizontal line in the curve diagram. The remaining five curves 1102, 1103, 1104, 1105, and 1106 correspond to the input signal curves after processing by 1st-order, 2nd-order, 3rd-order, 4th-order, and 5th-order high-pass filters, respectively. For more information on order, please refer to the relevant description of Figure 9.

[0109] For ease of comparison, the cutoff frequency of high-pass filters of all orders is 500 Hz. The corresponding crossover point can also be 500 Hz.

[0110] As shown in Figure 11, curves 1102, 1103, 1104, 1105, and 1106 all begin to show inflection points at the cutoff frequency. As the order of the high-pass filter increases, the rate of descent of curves 1102, 1103, 1104, 1105, and 1106 gradually accelerates. The lower the position of the curve portion in the descent region, the greater the slope of the curve portion in the descent region. This indicates that the higher the order of the high-pass filter, the better the high-pass filtering effect.

[0111] FIG. 12 is a schematic diagram of a curve of a first audio signal obtained after high-pass filtering of different orders according to some embodiments of this specification.

[0112] As shown in FIG12 , curve 1201 corresponds to the frequency response curve of the original audio signal. The remaining five curves 1202, 1203, 1204, 1205, and 1206 correspond to the frequency response curves of the first audio signal obtained by processing the original audio signal using high-pass filters of order 1, 2, 3, 4, and 5, respectively. For more information about the order, please refer to the description of FIG9 .

[0113] As shown in Figure 12, as the order of the high-pass filter increases, the rate of descent of curves 1202, 1203, 1204, and 1205 increases. The steeper the curve portion in the descent region, the greater the corresponding slope, and the less low-frequency vibration generated by the bone conduction vibrator 11 below the cutoff frequency. This indicates that the larger the order of the high-pass filter, the better the high-pass filtering effect.

[0114] In some embodiments, the order of the filter can be determined based on the slope of the linear region of the input signal curve. The linear region refers to the area on the curve that has a linear relationship. In some embodiments, the falling area of ​​the original audio signal after filtering can be equivalent to the linear region.

[0115] Taking a high-pass filter as an example, the order of the high-pass filter can be determined based on the slope of the linear region of the first audio signal curve by using formulas (1) and (2): y = klog 10 (freq)+b (1)

[0116] Where k represents the slope, y represents the amplitude of the linear ordinate, freq represents the frequency of the logarithmic abscissa, b represents the pitch, and m represents the filter order.

[0117] In some embodiments, any two points (x1, y1) and (x2, y2) can be selected in the linear region and substituted into formula (1) and formula (2) to obtain formula (3)-formula (6): y1=klog 10 (x1)+b (3) y2=klog 10 (x2)+b (4)

[0118] As an example only, we can take any two points (312.23, -59.8) and (150.73, -90.78) in the linear region and substitute them into formula (1) to formula (6): y1 = -59.8 = klog 10 (312.23)+b y2=-90.78=klog 10 (50.73)+b

[0119] In some embodiments, the slope k calculated after filtering the original audio signal may not be absolutely linear, and errors may exist when equating it to a linear region. This may result in errors between the calculated slope k and the filter order m. In some embodiments, to compensate for this error, the filter order m may have a ±2-order compensation.

[0120] In some embodiments, to reduce low-frequency vibrations of the bone conduction vibrator 11 and high-frequency sound leakage of the air conduction vibrator 12, thereby improving the user experience, the order of the high-pass filter or the low-pass filter may be no less than 2, and the slope of the corresponding linear region (or the absolute value of the slope) may be no less than 40. In some embodiments, to further improve the user experience, the order of the high-pass filter or the low-pass filter may be no less than 3, and the slope of the corresponding linear region (or the absolute value of the slope) may be no less than 60.

[0121] In some embodiments, when the crossover point is set to a lower frequency, the bone conduction vibrator 11 generates more low-frequency components. At this time, in order to reduce the discomfort caused by the low-frequency vibration of the bone conduction vibrator 11, the high-pass filter can be set to a higher order; when the crossover point is set to a higher frequency, the air conduction vibrator 12 generates more high-frequency components. At this time, in order to reduce the sound leakage generated by the air conduction vibrator 12 at high frequencies, the low-pass filter can be set to a higher order.

[0122] In some embodiments, when the crossover frequency is low, for example, when the crossover frequency is within a first frequency range, the order of the high-pass filter is higher than the order of the low-pass filter. The first frequency range can be selected based on experience or needs. In some embodiments, the first frequency range can be close to the second resonant frequency, for example, the first frequency range can be 300 Hz-1000 Hz.

[0123] When the crossover point is within the first frequency range (a lower frequency interval), from the perspective of reducing the vibration sensation of bone conduction vibration, the lower the crossover point, the more it is necessary to prevent the first audio signal of the bone conduction vibrator 11 from extending to low frequencies. Therefore, the order of the high-pass filter should be set higher. The higher the order of the high-pass filter, the less low-frequency vibration the bone conduction vibrator 11 can generate below the crossover point, thereby reducing the vibration sensation of low-frequency bone conduction vibration and improving the user experience.

[0124] When the crossover point is within the first frequency range (a lower frequency interval), the second audio signal of the air conduction oscillator 12 is far from the third resonant frequency, and the order of the low-pass filter for the second audio signal of the air conduction oscillator 12 is less restricted. Lowering the filter order can reduce circuit complexity or algorithm complexity, so the low-pass filter order can be set to a lower value.

[0125] In some embodiments, when the crossover point is in the first frequency range (lower frequency interval), the order of the high-pass filter can be higher than the order of the low-pass filter to avoid the bone conduction vibrator 12 from generating excessive low-frequency vibrations, while reducing the circuit complexity or algorithm complexity of the low-pass filter.

[0126] In some embodiments, when the crossover point is set higher, for example, when the crossover point is in the second frequency range, the order of the low-pass filter is higher than the order of the high-pass filter. The minimum value of the second frequency range may be greater than the maximum value of the first frequency range. The second frequency range may be selected based on experience or demand. In some embodiments, the second frequency range may be close to the third resonant frequency, for example, the second frequency range may be 2000Hz-3000Hz. When the crossover point is in the second frequency range (a higher frequency interval), the higher the crossover point, the more it is necessary to avoid the second audio signal of the air conduction oscillator 12 from extending to high frequencies, and therefore the order of the low-pass filter should be set higher.

[0127] When the crossover point is in the second frequency range (higher frequency range), the higher the order of the low-pass filter, the less high-frequency air-conducted sound can be generated by the air-conducted vibrator 12 above the crossover point, which can avoid the problem of increased sound leakage caused by the failure of the dipole mechanism in the high-frequency band, and can also avoid the influence of the third resonance peak of the third resonance frequency of around 3kHz and 4kHz in the front cavity or rear cavity of the acoustic output device 100 (the appearance of the third resonance peak will further destroy the far-field sound leakage reduction of the dipole).

[0128] When the crossover point is within the second frequency range (a higher frequency interval), the first audio signal from the bone conduction vibrator 12 is far from the frequency band with significant vibration, and the order of the high-pass filter applied to the first audio signal from the bone conduction vibrator 11 is less restricted. Lowering the filter order can reduce circuit complexity or algorithm complexity, so the high-pass filter order can be set lower.

[0129] In some embodiments, when the crossover point is in the second frequency range (higher frequency interval), the order of low-pass filtering is higher than the order of high-pass filtering, avoiding excessive high-frequency sound leakage while reducing the circuit complexity or algorithm complexity of high-pass filtering.

[0130] In some embodiments, when the crossover point is within the third frequency range, the order of the low-pass filter can be the same as the order of the high-pass filter. The minimum value of the third frequency range can be greater than the minimum value of the first frequency range, and the maximum value of the third frequency range can be less than the maximum value of the second frequency range. The third frequency range can be selected based on experience or needs. For example, the third frequency range can be 1000 Hz-2000 Hz.

[0131] When the crossover point is within the third frequency range, the first audio signal of the bone conduction vibrator 12 is far from the frequency band with significant vibration, and the order limit of the high-pass filter for the first audio signal of the bone conduction vibrator 11 is relatively small; and the second audio signal of the air conduction vibrator 12 is far from the third resonant frequency, and the order limit of the low-pass filter for the second audio signal of the air conduction vibrator 12 is relatively small. The order of the low-pass filter and the order of the high-pass filter can both be small to reduce the circuit complexity or algorithm complexity of the high-pass filter and the low-pass filter. In this case, the order of the low-pass filter can be lower than, equal to, or higher than the order of the high-pass filter.

[0132] In some embodiments, the order of high-pass filtering or low-pass filtering can be made variable through the configuration of the processing circuit 120 .

[0133] By setting the order of the high-pass filter or low-pass filter to be variable, the low-frequency components in the first audio signal or the high-frequency components in the second audio signal can be adjusted. The lower the order of the high-pass filter, the more pronounced the low-frequency vibrations produced by the bone conduction vibrator 11. Therefore, increasing the order of the high-pass filter helps reduce the low-frequency vibration, which is similar to the effect of increasing the crossover point on bone conduction sound. The lower the order of the low-pass filter, the more high-frequency sound produced by the air conduction vibrator 12. Therefore, increasing the order of the low-pass filter helps reduce the high-frequency air conduction sound, which is similar to the effect of lowering the crossover point on air conduction sound.

[0134] In some embodiments, the order of the high-pass filter when the crossover point is in the first frequency range is higher than the order of the high-pass filter when the crossover point is in the second frequency range.

[0135] The high-pass filter is primarily used to perform high-pass filtering on the original audio signal to provide a high-frequency first audio signal to the bone conduction vibrator 11. If the crossover frequency is high, the first audio signal from the bone conduction vibrator 11 is difficult to extend into the low-frequency region, placing less restriction on the order of the high-pass filter. In this case, to reduce circuit or algorithm complexity, the high-pass filter can be set to a lower order. If the crossover frequency is low, it is necessary to avoid excessive low-frequency signals from being mixed into the first audio signal from the bone conduction vibrator 11. In this case, the high-pass filter order can be set to a higher one. That is, the high-pass filter order is higher when the crossover frequency is in a higher frequency range than when the crossover frequency is in a lower frequency range.

[0136] In some embodiments, the order of the low-pass filter when the crossover point is in the first frequency range is lower than the order of the low-pass filter when the crossover point is in the second frequency range.

[0137] The low-pass filter is mainly used to perform low-pass filtering on the original audio signal to provide a low-frequency second audio signal to the air conduction oscillator 12. If the frequency of the crossover point is low, it is difficult for the second audio signal of the air conduction oscillator 12 to extend to the high-frequency region, and the order of the low-pass filter is relatively small. At this time, from the perspective of reducing circuit complexity or algorithm complexity, the low-pass filter can be set to a lower order; if the frequency of the crossover point is high, it is necessary to avoid mixing too many high-frequency signals into the second audio signal of the air conduction oscillator 12. At this time, the order of the low-pass filter can be set to a higher level. Therefore, compared with the crossover point being in a lower frequency range, the order of the low-pass filter is lower when the crossover point is in a higher frequency range.

[0138] In some embodiments, the processing circuit 120 can simultaneously adjust the crossover frequency and the order of the high-pass filter / low-pass filter to adjust the components of the first audio signal and the second audio signal, thereby adjusting the high- and low-frequency output effects of the acoustic output device 100, making the acoustic output device 100 suitable for different scenarios and improving the user experience of the acoustic output device. For example, based on the aforementioned description of the different value ranges of the crossover frequency, after moving the crossover frequency toward the low frequency (lowering the crossover frequency), the low-frequency components generated by the bone conduction vibrator 11 will increase. To avoid excessive low-frequency signals being mixed into the first audio signal of the bone conduction vibrator 11, the order of the high-pass filter can be increased accordingly. After moving the crossover frequency toward the high frequency (raising the crossover frequency), the high-frequency components generated by the air conduction vibrator 12 will increase. To avoid excessive high-frequency signals being mixed into the second audio signal of the air conduction vibrator 12, the order of the low-pass filter can be increased accordingly.

[0139] Similarly, after lowering the order of the high-pass filter, the bone conduction vibrator 11 will generate more low-frequency vibrations. At this time, a higher crossover point can be used to avoid generating more low frequencies; after lowering the order of the low-pass filter, the air conduction vibrator 12 will generate more high-frequency sounds. At this time, a lower crossover point can be used to avoid generating more high frequencies.

[0140] While the basic concepts have been described above, it will be apparent to those skilled in the art that the detailed disclosure is merely illustrative and does not limit this specification. Although not explicitly stated herein, various modifications, improvements, and revisions to this specification may be made by those skilled in the art. Such modifications, improvements, and revisions are suggested in this specification and remain within the spirit and scope of the exemplary embodiments of this specification.

[0141] This specification also uses specific terms to describe the embodiments of this specification. For example, "one embodiment," "an embodiment," and / or "some embodiments" refer to a feature, structure, or characteristic associated with at least one embodiment of this specification. Therefore, it should be emphasized and noted that references to "one embodiment," "an embodiment," or "an alternative embodiment" two or more times in different locations in this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of this specification may be appropriately combined.

[0142] Similarly, it should be noted that, in order to simplify the presentation of this specification and thus facilitate understanding of one or more embodiments of the invention, the foregoing descriptions of the embodiments of this specification sometimes combine multiple features into a single embodiment, figure, or description thereof. However, this disclosure method does not imply that the subject matter of this specification requires more features than those recited in the claims. In fact, an embodiment may have fewer features than all of the features of a single disclosed embodiment.

[0143] Finally, it should be understood that the embodiments described in this specification are intended only to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, by way of example and not limitation, alternative configurations of the embodiments of this specification may be considered consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly described and illustrated in this specification.

Claims

1. An acoustic output device, comprising: Housing; A bone conduction oscillator for generating bone conduction sound waves that are transmitted through the housing to the cochlea to produce sound; An air conduction oscillator for generating air conduction sound waves that are transmitted through sound conduction holes in the housing to the user's ear; A processing circuit configured to: provide a first audio signal to the bone conduction oscillator and a second audio signal to the air conduction oscillator, wherein, The processing circuit is further configured to: adjust the low-frequency components in the first audio signal or adjust the high-frequency components in the second audio signal.

2. The acoustic output device according to claim 1, wherein, The processing circuit provides the first audio signal to the bone conduction oscillator and the second audio signal to the air conduction oscillator based on a crossover point; wherein, The crossover point is variable, the first audio signal includes components with frequencies above the crossover point, and the second audio signal includes components with frequencies below the crossover point.

3. The acoustic output device according to claim 2, wherein, The crossover point is not lower than 300 Hz.

4. The acoustic output device according to claim 2, wherein, The crossover point is not higher than 3000 Hz.

5. The acoustic output device according to claim 2, wherein, The processing circuit obtains the first audio signal by performing high-pass filtering on an electrical signal containing sound information; the processing circuit obtains the second audio signal by performing low-pass filtering on an electrical signal containing sound information.

6. The acoustic output device according to claim 5, wherein, The order of the high-pass filtering or the order of the low-pass filtering is not lower than 3.

7. The acoustic output device according to claim 6, wherein, When the crossover point is in the first frequency range, the order of the high-pass filtering is higher than the order of the low-pass filtering.

8. The acoustic output device according to claim 7, wherein, When the crossover point is in the second frequency range, the order of the low-pass filtering is higher than the order of the high-pass filtering, and the maximum value of the first frequency range is lower than the minimum value of the second frequency range.

9. The acoustic output device according to claim 5, wherein, The order of the high-pass filtering or the order of the low-pass filtering is variable.

10. The acoustic output device according to claim 9, wherein, When the crossover point is in the first frequency range, the order of the high-pass filtering is higher than the order of the high-pass filtering when the crossover point is in the second frequency range, and the maximum value of the first frequency range is lower than the minimum value of the second frequency range.

11. The acoustic output device according to claim 9, wherein, When the crossover point is in the first frequency range, the order of the low-pass filtering is lower than the order of the low-pass filtering when the crossover point is in the second frequency range, and the maximum value of the first frequency range is lower than the minimum value of the second frequency range.

12. The acoustic output device according to claim 1 or 2, wherein, The first audio signal is obtained by the processing circuit performing high-pass filtering on an electrical signal containing sound information, the second audio signal is obtained by the processing circuit performing low-pass filtering on an electrical signal containing sound information, and the order of the high-pass filtering or the order of the low-pass filtering is variable.

13. The acoustic output device according to claim 12, wherein, The first audio signal and the second audio signal have a crossover point. When the crossover point is in the first frequency range, the order of the high-pass filtering is higher than the order of the high-pass filtering when the crossover point is in the second frequency range, and the maximum value of the first frequency range is lower than the minimum value of the second frequency range.

14. The acoustic output device according to claim 12, wherein, The first audio signal and the second audio signal have a crossover point. When the crossover point is in the first frequency range, the order of the low-pass filtering is lower than the order of the low-pass filtering when the crossover point is in the second frequency range, and the maximum value of the first frequency range is lower than the minimum value of the second frequency range.

15. The acoustic output device according to claim 12, wherein, The order of the high-pass filter or the order of the low-pass filter is not less than the third order.

16. The acoustic output device according to claim 15, wherein, The first audio signal and the second audio signal have a crossover point. When the crossover point is within the first frequency range, the order of the high-pass filter is higher than the order of the low-pass filter.

17. The acoustic output device according to claim 16, wherein, When the crossover point is within the second frequency range, the order of the low-pass filter is higher than the order of the high-pass filter, and the maximum value of the first frequency range is lower than the minimum value of the second frequency range.

18. The acoustic output device according to claim 12, wherein,The crossover point is not less than 300 Hz.

19. The acoustic output device according to claim 12, wherein, The crossover point is not higher than 3000 Hz.

20. The acoustic output device according to any one of claims 1 - 3, wherein, The processing circuit is further configured to: receive a trigger signal and adjust the low-frequency components in the first audio signal or adjust the high-frequency components in the second audio signal based on the trigger signal.

21. The acoustic output device according to claim 20, wherein, The first audio signal and the second audio signal have a crossover point. Adjusting the low-frequency components in the first audio signal includes: enhancing the low-frequency components in the first audio signal with frequencies lower than the crossover point.

22. The acoustic output device according to claim 21, wherein, Enhancing the low-frequency components in the first audio signal with frequencies lower than the crossover point includes: lowering the crossover point.

23. The acoustic output device according to claim 21, wherein, The first audio signal is obtained by subjecting an electrical signal containing sound information to high-pass filtering processing by the processing circuit; Enhancing the low-frequency components in the first audio signal with frequencies lower than the crossover point includes: lowering the order of the high-pass filter.

24. The acoustic output device according to claim 20, wherein, The first audio signal and the second audio signal have a crossover point. Adjusting the high-frequency components in the second audio signal includes: attenuating the high-frequency components in the second audio signal with frequencies higher than the crossover point.

25. The acoustic output device according to claim 24, wherein, Attenuating the high-frequency components in the second audio signal with frequencies higher than the crossover point includes: lowering the crossover point.

26. The acoustic output device according to claim 24, wherein, The second audio signal is obtained by subjecting an electrical signal containing sound information to low-pass filtering processing by the processing circuit; Attenuating the high-frequency components in the second audio signal with frequencies higher than the crossover point includes: increasing the order of the low-pass filter.

27. The acoustic output device according to claim 20, wherein, The trigger signal is obtained based on the recognition of the sound content by the acoustic output device or a processing device connected to the acoustic output device.

28. The acoustic output device according to claim 20, wherein, The trigger signal is obtained based on the recognition of the surrounding environment by the acoustic output device or a processing device connected to the acoustic output device.

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