Sound output device

Abstract

One or more embodiments of the present description relate to a sound output device, comprising: a first loudspeaker configured to generate a sound in a first frequency band in response to a first electric signal; a frequency division circuit configured to perform frequency division processing on an excitation signal to generate the first electric signal, wherein the frequency division circuit is configured to: suppress a signal component having a frequency lower than a frequency division frequency in the excitation signal, so that a signal component having a frequency lower than a break-up frequency of the first loudspeaker in the generated first electric signal attenuates by a preset amplitude compared with a signal component having a frequency lower than the break-up frequency in the excitation signal; a housing configured to accommodate the first loudspeaker and the frequency division circuit; and a supporting structure configured to enable the housing to be worn at a position near the ear canal opening of a user without blocking the ear canal opening.

Description

A sound output device Technical Field

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

[0002] With the development of acoustic technology, acoustic devices (such as headphones) have been widely used in people's daily lives. Acoustic devices can potentially employ multiple speakers to output sound, providing users with an auditory feast. In combined use, different speakers may be responsible for outputting sound in different frequency bands. Generally, speakers emitting different frequency bands can be driven by a single electrical signal or by multiple electrical signals. When driven by a single electrical signal, because the diaphragm of the speaker responsible for higher frequency sound output is usually thinner, the diaphragm may experience distortion due to excessive amplitude when receiving low-frequency signals, affecting listening quality and the user experience.

[0003] Therefore, it is necessary to provide a sound output device to avoid or reduce the distortion of speakers responsible for higher frequency sound output due to receiving low frequency electrical signals, so as to provide users with a better listening experience.

[0004] Summary of the Invention

[0005] This specification provides a sound output device in some embodiments, including: a first speaker configured to respond to a first electrical signal to generate sound in a first frequency band; a frequency divider circuit configured to perform frequency division processing on an excitation signal to generate the first electrical signal, the frequency divider circuit being configured to: suppress signal components in the excitation signal with frequencies lower than the frequency division frequency, such that signal components in the generated first electrical signal with frequencies lower than the distortion frequency of the first speaker are attenuated by a preset amount compared to signal components in the excitation signal with frequencies lower than the distortion frequency; a housing configured to accommodate the first speaker and the frequency divider circuit; and a support structure configured to place the housing near the ear canal opening of a user without blocking the ear canal opening.

[0006] This specification provides a sound output device in some embodiments, including: a first loudspeaker configured to output sound in a first frequency band; the first loudspeaker includes a first diaphragm, with a first front cavity and a first rear cavity respectively isolated on both sides of the vibration direction of the first diaphragm, and the first front cavity of the first loudspeaker is connected to the outside through a first sound guide hole; a second loudspeaker configured to output sound in a second frequency band, the frequency of the second frequency band being lower than the frequency of the first frequency band; the second loudspeaker includes a second diaphragm, with a second front cavity and a second rear cavity respectively isolated on both sides of the vibration direction of the second diaphragm, and the second front cavity of the second loudspeaker is connected to the outside through a second sound guide hole; a housing configured to accommodate the first loudspeaker and the second loudspeaker; a support structure configured to place the housing near the user's ear canal opening without blocking the ear canal opening; wherein, the first rear cavity is provided with a sound guide hole, one end of the sound guide hole is connected to the first rear cavity, the other end of the sound guide hole is connected to the second front cavity, and the first rear cavity is connected to the second front cavity through the sound guide hole. Attached Figure Description

[0007] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0008] Figure 1 is an exemplary frame diagram of a sound output device according to some embodiments of this specification;

[0009] Figure 2 is an exemplary schematic diagram of a frequency divider circuit according to some embodiments of this specification;

[0010] Figure 3 is an exemplary schematic diagram of the frequency division effect under different frequency division processing conditions according to some embodiments of this specification;

[0011] Figure 4 is an exemplary structural diagram of a first loudspeaker and a second loudspeaker according to some embodiments of this specification;

[0012] Figure 5 is an exemplary structural schematic diagram of a first loudspeaker according to some embodiments of this specification;

[0013] Figure 6 is an exemplary structural diagram of a first loudspeaker and a second loudspeaker according to some other embodiments of this specification;

[0014] Figure 7 is an exemplary structural diagram of another first and second loudspeaker according to some embodiments of this specification. Detailed Implementation

[0015] To more clearly illustrate the technical solutions of the embodiments in this specification, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are merely some examples or embodiments of this specification. For those skilled in the art, these drawings can be applied to other similar scenarios without creative effort. Unless obvious from the context or otherwise specified, the same reference numerals in the drawings represent the same structures or operations.

[0016] It should be understood that the terms “system,” “device,” “unit,” and / or “module” used herein are one way to distinguish different components, elements, parts, sections, or assemblies at different levels. However, if other terms can achieve the same purpose, they may be replaced by other expressions.

[0017] As indicated in this specification and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0018] This specification provides a sound output device in some embodiments, including: a first speaker configured to respond to a first electrical signal to generate sound in a first frequency band; a frequency divider circuit configured to perform frequency division processing on an excitation signal to generate the first electrical signal, the frequency divider circuit being configured to: suppress signal components in the excitation signal with frequencies lower than the frequency division frequency, such that signal components in the generated first electrical signal with frequencies lower than the distortion frequency of the first speaker are attenuated by a preset amount compared to signal components in the excitation signal with frequencies lower than the distortion frequency; a housing configured to accommodate the first speaker and the frequency divider circuit; and a support structure configured to place the housing near the ear canal opening of a user without blocking the ear canal opening.

[0019] Figure 1 is an exemplary frame diagram of a sound output device according to some embodiments of this specification.

[0020] As shown in Figure 1, the sound output device 100 may include a first speaker 110, a crossover circuit 120, a housing 130, and a support structure 140.

[0021] The housing 130 is connected to the support structure 140 and configured to house the first speaker 110 and the crossover circuit 120. In some embodiments, the housing 130 may be a closed housing structure with an internal accommodating cavity, and the first speaker 110 and the crossover circuit 120 are located within the accommodating cavity of the housing 130. In some embodiments, the sound output device 100 may be a product or combination of products such as smart glasses, headphones, head-mounted displays, AR / VR helmets, etc., in which case the sound output device 100 may be fixed near the user's ear by suspension or clamping. In some alternative embodiments, the housing 130 may be provided with a suspension structure (e.g., a hook). For example, the shape of the hook matches the shape of the ear, and the sound output device 100 can be worn independently on the user's ear via the hook.

[0022] In some embodiments, the housing 130 can be a housing structure with a shape that fits the human ear, such as a ring, an ellipse, a racetrack shape, a polygon (regular or irregular), a U-shape, a V-shape, a semi-circle, or other regular or irregular shapes, so that the housing 130 can be directly attached to the user's ear.

[0023] The support structure 140 is configured to place the housing 130 near the user's ear canal opening without blocking it, keeping the user's ear canal open so that the user can hear the sound output from the sound output device 100 while also receiving sounds from the external environment. For example, the sound output device 100 can be positioned around or partially around the user's auricle and can transmit sound via air conduction or bone conduction. Exemplarily, the sound transmission device 100 can be used as an accessory for smart glasses, positioned at the temples and valances, thereby surrounding or partially surrounding the user's auricle.

[0024] In some embodiments, the support structure 140 may vary depending on the type of sound output device 100. For example, when the sound output device 100 is an earphone, the support structure 140 may be an ear hook; when the sound output device 100 is eyeglasses, the support structure 140 may be a temple; when the sound output device 100 is a wristband, the support structure 140 may be a strap; and when the sound output device 100 is other head-mounted devices, the support structure 140 may be a helmet, etc.

[0025] In some embodiments, the first loudspeaker 110 refers to an acoustic transducer with good acoustic output performance within a first frequency band, thereby improving the output performance of the sound output device 100 in the first frequency band. In some embodiments, the range of the first frequency band may have different standards based on actual conditions. For example, the range of the first frequency band may refer to a frequency range of not less than 5 kHz, such as 5 kHz-10 kHz, 8 kHz-16 kHz, etc.

[0026] In some embodiments, the sound output device 100 may further include a second loudspeaker 150. The second loudspeaker 150 refers to an acoustic transducer that has good acoustic output performance within a second frequency band, thereby enabling the sound output device 100 to have good output performance within the second frequency band. In some embodiments, the range of the second frequency band may have different standards based on actual conditions. For example, the range of the second frequency band may refer to a frequency range not exceeding 5 kHz, such as 20 Hz-3 kHz, 100 Hz-5 kHz, etc.

[0027] In the embodiments described in this specification, at least a portion of the frequencies of the first frequency band are higher than the frequencies of the second frequency band. For example, the range of the first frequency band may be 5kHz-20kHz, and the range of the second frequency band may be 20Hz-6kHz. As another example, the range of the first frequency band may be 8kHz-20kHz, and the range of the second frequency band may be 20Hz-8.5kHz. In other embodiments, the first frequency band may also be referred to as a high-frequency band, and the second frequency band may also be referred to as a low-frequency band or a mid-low-frequency band. For example, the first frequency band (high-frequency band) and the second frequency band (low-frequency band / mid-low-frequency band) can refer to any two frequency bands with relatively different frequency magnitudes. For example, the frequency of the first frequency band is not lower than 7kHz, and the frequency of the second frequency band is less than 7kHz.

[0028] In some embodiments, the sound output device 100 may further include a drive circuit 160, which refers to an electronic circuit for providing excitation signals to the first speaker and the second speaker. In some embodiments, the excitation signal may include electrical signals stored internally in the sound output device 100 or in a device connected to the outside world for communication. For example, the excitation signal may be an electrical signal obtained from a multimedia platform, terminal device, storage device, etc. In some embodiments, the excitation signal may be generated by a digital-to-analog converter. In some embodiments, the operating frequency band of the excitation signal may include 20Hz-20kHz or 20Hz-16kHz. In some embodiments, the operating frequency band of the excitation signal includes the aforementioned first frequency band and second frequency band, where the electrical signal in the first frequency band of the excitation signal may be referred to as a high-frequency signal, and the electrical signal in the second frequency band of the excitation signal may be referred to as a low-frequency signal.

[0029] When both the first speaker 110 and the second speaker 150 are driven by the same excitation signal, or when the first speaker 110 and the second speaker 150 are driven separately by the same excitation signal, the first diaphragm (e.g., the first diaphragm 110-1) of the first speaker 110, which is mainly responsible for the output of higher frequency bands (frequency bands included in the first frequency band), is usually thin. When receiving low frequency (frequency bands included in the second frequency band) signals, the diaphragm may experience distortion due to excessive amplitude, affecting the listening quality and user experience. To avoid distortion in the sound output of the first speaker and to provide a better user experience, the electrical signal received by the first speaker 110 can be processed by the frequency divider circuit 120 to prevent the first speaker 110 from receiving electrical signals of lower frequency bands (e.g., the second frequency band).

[0030] Frequency divider circuit 120 refers to an electronic circuit used to perform frequency division processing on the excitation signal. In some embodiments, frequency divider circuit 120 is configured to perform frequency division processing on the excitation signal to generate a first electrical signal input to the first loudspeaker 110. At this time, frequency divider circuit 120 is configured to suppress signal components in the excitation signal with frequencies lower than the division frequency, and the first loudspeaker 110 and frequency divider circuit 120 can cooperate to realize that the first loudspeaker 110 mainly outputs sound in a first frequency band. Frequency division processing can include various methods, such as high-pass filtering, band-pass filtering, band-stop filtering, etc. In some embodiments, frequency divider circuit 120 can generate the first electrical signal input to the first loudspeaker 110 by performing high-pass filtering processing on the excitation signal.

[0031] The division frequency refers to the critical frequency used when performing frequency division processing on the excitation signal. For example, the division frequency can be 8kHz, and the frequency division processing of the frequency division circuit 120 can primarily suppress signal components in the excitation signal with frequencies below 8kHz. The frequency band in which the sound output by the aforementioned first speaker 110 produces distortion can be called the distortion band, and the maximum frequency value in the distortion band can be called the distortion frequency. In some embodiments, the distortion frequency of the first speaker is less than or equal to 200Hz, meaning that the first speaker mainly produces distortion in the frequency range below 200Hz. In some embodiments, the second frequency band includes the distortion band.

[0032] In this embodiment, by performing frequency division processing on the excitation signal, the first electrical signal input to the first speaker 110 mainly includes electrical signals in the first frequency band. The first speaker 110 receives the first electrical signal to output sound within the first frequency band. This effectively prevents the first speaker 110 from receiving electrical signals in lower frequency bands (e.g., the second frequency band), thereby preventing distortion in the sound output by the first speaker and providing a better user experience. Simultaneously, the frequency division circuit effectively prevents the first speaker 110 from receiving electrical signals in lower frequency bands (e.g., the second frequency band), thereby effectively preventing the first speaker 110 from outputting sound in lower frequency bands (e.g., the second frequency band) and effectively reducing the power consumption of the first speaker 110.

[0033] In some embodiments, depending on the working principle, the types of the second loudspeaker 150 and the first loudspeaker 110 may include, but are not limited to, moving-coil transducers, moving-iron transducers, planar transducers, and piezoelectric transducers. Among these, moving-coil transducers have high transduction efficiency, high sensitivity, and good overall sound quality, but their output performance in the first frequency band is poor. Moving-iron transducers have high sensitivity, but their frequency response curve has a small flat range, and they are structurally complex, costly, and have a long, narrow structure, making design difficult. Piezoelectric transducers have high transduction efficiency and high sensitivity, but they require high voltage to drive the piezoelectric element, and their frequency response curve is not flat in the first frequency band, with large peaks and troughs in the vibration modes. Planar transducers have more uniform stress on the diaphragm, better avoiding the generation of segmented vibrations, thus better avoiding distortion of the output sound, and providing good output performance in the first frequency band.

[0034] Based on the foregoing analysis, in some embodiments, the second loudspeaker 150 may employ a moving-coil transducer to provide better acoustic output within the second frequency band. In some embodiments, the first loudspeaker 110 may employ a planar transducer to provide better acoustic output within the first frequency band.

[0035] In some embodiments, the second speaker 150 primarily generates sound in the second frequency band in response to the second electrical signal. In some embodiments, the excitation signal can be directly input to the second speaker 150 as the second electrical signal, so that the second speaker 150 has a high output in the second frequency band while also having a certain output in the first frequency band, thus supplementing the output of the first speaker 110 in the first frequency band and improving the output performance of the sound output device 100 in the first frequency band. In some embodiments, the second electrical signal can also be an electrical signal obtained by low-pass filtering the excitation signal.

[0036] In some embodiments, the sound output device may further include another frequency divider circuit (not shown in the figure), which is configured to perform low-pass filtering on the excitation signal to generate a second electrical signal and input the low-pass filtered second electrical signal to the second speaker 150.

[0037] As shown in Figure 2, in some embodiments, the frequency divider circuit 120 may include a capacitor element 120-1 connected in series with the first speaker 110. The capacitor element 120-1 performs high-pass filtering of the excitation signal to generate a first electrical signal, and the first electrical signal formed after high-pass filtering is input to the first speaker 110. Another frequency divider circuit may include an inductor element 120-2 connected in series with the second speaker 150. The inductor element 120-2 performs low-pass filtering of the excitation signal to generate a second electrical signal, and the second electrical signal formed after low-pass filtering is input to the second speaker 150. In some embodiments, the low-pass filtering can be used to attenuate the amplitude of the first frequency band component in the excitation signal.

[0038] It is understood that in some embodiments of this application, the frequency divider circuit 120 and another frequency divider circuit can be set separately or integrated in the same processing circuit or the same processor. This application does not specifically limit its form.

[0039] In some embodiments, the first speaker primarily exhibits distortion in the frequency range below 200Hz. To prevent distortion in the first speaker 110, it is necessary to attenuate the signal components in the first electrical signal received by the first speaker 110 that are below the distortion frequency (e.g., 200Hz). The greater the attenuation of the signal components in the first electrical signal received by the first speaker 110 that are below the distortion frequency, the lower the probability of distortion in the frequency band below the distortion frequency. To better avoid distortion in the second frequency band, in some embodiments, the frequency divider circuit 120 performs frequency division processing on the excitation signal, causing the signal components in the generated first electrical signal that are below the distortion frequency to be attenuated by a preset amplitude compared to the signal components in the excitation signal that are below the distortion frequency. The preset amplitude can be a preset value, a user-input value, etc. In some embodiments, to reduce the probability of distortion in the second frequency band, the preset amplitude can be greater than or equal to 20dB, where the second frequency band includes the distortion frequency of the first speaker 110. In some embodiments, to further reduce the probability of distortion in the second frequency band of the first speaker 110, the preset amplitude can be greater than or equal to 30dB. In some embodiments, to further reduce the probability of distortion in the second frequency band of the first speaker 110, the preset amplitude can be greater than or equal to 40dB. In this case, the first speaker outputs less or no sound below the distortion frequency, and the sound in this frequency band is mainly output by the second speaker, thus avoiding interference of the output sound waves.

[0040] In some embodiments, to maximize the attenuation of signal components with frequencies lower than the breaking frequency in the first electrical signal received by the first speaker 110, the crossover frequency can be selected to be far from the breaking frequency of the first speaker 110 (e.g., 200Hz). For example, the crossover frequency can be five octaves away from the breaking frequency of the first speaker 110. For instance, using 200Hz as the breaking frequency of the first speaker 110, the crossover frequency can be located at (200 × 2...). 5 The frequency range is around 6.4 kHz, meaning the crossover frequency can include 6.4 kHz. In some embodiments, if the crossover frequency is too high, the first frequency band component in the first electrical signal obtained by crossover will be reduced, which may affect the normal output of the first speaker 110. Therefore, the octave range between the crossover frequency and the breaking frequency of the first speaker 110 should not be too large. In some embodiments, the octave range between the crossover frequency and the breaking frequency of the first speaker 110 may not exceed 6, meaning the corresponding crossover frequency may not be greater than (200 × 2 kHz). 6 The crossover frequency is no greater than 12.8 kHz. In some embodiments, to further ensure the first frequency band component in the first electrical signal and thus guarantee the output of the first speaker 110, the crossover frequency can be 6 kHz to 9 kHz. In some embodiments, to further reduce the second frequency band component in the first electrical signal, the crossover frequency can be 7.5 kHz to 8.5 kHz. For example, the crossover frequency can be 8 kHz.

[0041] In some embodiments, the division frequency can be obtained by detecting the electrical signal input to the first speaker 110 after passing through the division circuit. In some embodiments, when the excitation signal is a sweep signal, the frequency corresponding to the inflection point on the frequency response curve of the first electrical signal obtained after the division process is the division frequency, indicating that the attenuation amplitude of the first electrical signal changes before and after the inflection point. For example, for the first electrical signal after high-pass filtering, the attenuation amplitude of the curve portion before the inflection point increases (greater than the attenuation amplitude of the original excitation signal), and the attenuation amplitude increases with distance from the inflection point; the attenuation amplitude of the curve portion after the inflection point is approximately similar to the attenuation amplitude of the original excitation signal.

[0042] In some embodiments, the sound output device 100 may include multiple digital-to-analog converters (DACs) to generate excitation signals for a first frequency band and a second frequency band. By inputting the excitation signal for the first frequency band to the first speaker 110 and the excitation signal for the second frequency band to the second speaker 150, distortion in the second frequency band of the first speaker 110 is avoided. However, using multiple DACs not only increases the manufacturing cost of the sound output device 100 but also increases its overall size. Therefore, to reduce the manufacturing cost and size of the sound output device 100, in some embodiments, the sound output device 100 may use only one DAC to output a single excitation signal that simultaneously excites both the first speaker 110 and the second speaker 150. To prevent distortion in the second frequency band of the first speaker 110, the excitation signal output by the DAC can be divided by a frequency divider circuit 120. More details about the second speaker can be found in the following description.

[0043] Figure 2 is an exemplary schematic diagram of a frequency divider circuit according to some embodiments of this specification.

[0044] As shown in Figure 2, the frequency divider circuit 120 may include a capacitor element 120-1 connected in series with the first speaker 110. The frequency divider circuit 120 uses the capacitor element 120-1 to perform high-pass filtering on the excitation signal to generate a first electrical signal.

[0045] In some embodiments, the number of capacitor elements 120-1 connected in series with the first speaker 110 can be one. One capacitor element 120-1 can constitute a first-order high-pass filter to perform first-order frequency division processing on the excitation signal to generate a first electrical signal. In some embodiments, the number of capacitor elements 120-1 connected in series with the first speaker 110 can be multiple, for example, two, three, etc. Multiple capacitor elements 120-1 and other electronic components (e.g., amplifiers, resistors, etc.) can constitute a multi-order high-pass filter to perform multi-order frequency division processing on the excitation signal to generate a first electrical signal.

[0046] In some embodiments, the higher the order of the high-pass filter, the faster the signal components in the excitation signal below the corresponding division frequency attenuate. Considering the large octave band between the division frequency and the cutoff frequency (e.g., 200Hz) of the first speaker 110, in order to attenuate the signal components in the first electrical signal with frequencies below the cutoff frequency by a predetermined amount compared to the signal components in the excitation signal with frequencies below the cutoff frequency, the frequency divider circuit 120 may employ a first-order or multi-order high-pass filter. In some embodiments, for the purpose of simplifying the circuit and reducing system complexity, while ensuring the normal output of the first speaker 110, when the division frequency is 6kHz-9kHz, the frequency divider circuit 120 may employ a first-order high-pass filter, that is, the number of capacitor elements 120-1 connected in series with the first speaker 110 may be one.

[0047] In some embodiments, when the frequency division circuit 120 uses a first-order high-pass filter, the capacitance value of the capacitor element 120-1 connected in series with the first speaker 110 is related to the frequency division frequency of the frequency division process.

[0048] Figure 3 is an exemplary schematic diagram illustrating the frequency division effect under different frequency division processing conditions according to some embodiments of this specification. As shown in Figure 3, curve A is the excitation signal curve without frequency division processing; curve B is the first electrical signal curve generated after frequency division using a capacitor element with a series capacitance of 2uF; curve C is the first electrical signal curve generated after frequency division using a capacitor element with a series capacitance of 4.6uF; curve D is the first electrical signal curve generated after frequency division using a capacitor element with a series capacitance of 10uF; curve E is the first electrical signal curve generated after frequency division using a capacitor element with a series capacitance of 22uF; and curve F is the first electrical signal curve generated after frequency division using two capacitor elements in series.

[0049] In some embodiments, the capacitance value of the capacitor element 120-1 connected in series with the first speaker 110 is related to the crossover frequency. In some embodiments, the capacitance value of the capacitor element 120-1 may correspond to a theoretical crossover frequency:

[0050] Where C is the capacitance of the capacitor element; f c Z0 is the division frequency for the frequency division process; Z0 is the rated impedance of the first loudspeaker. It can be understood that when there are multiple capacitor elements 120-1 connected in series with the first loudspeaker 110, the capacitance value calculated by formula (1) is the equivalent capacitance value of the multiple capacitor elements 120-1.

[0051] Because the first loudspeaker 110 contains a magnetic circuit assembly and a voice coil, the voice coil moves relative to the magnetic circuit assembly after receiving the first electrical signal, thereby driving the first diaphragm 110-1 to vibrate and produce sound. In the circuit, the voice coil acts as an inductor, affecting the crossover frequency and causing a deviation between the actual and theoretical crossover frequencies. As shown in Figure 3, curve B corresponds to the actual crossover frequency (i.e., the maximum point M of curve B). B The corresponding frequency is around 15kHz, and the actual crossover frequency corresponding to curve C (i.e., the maximum point M of curve C) is... C The corresponding frequency is around 8kHz, and the actual crossover frequency corresponding to curve D (i.e., the maximum point M of curve D) is... D The corresponding frequency is around 3.4kHz, and the actual frequency division of curve E (i.e., the maximum point M of curve E) is... E The corresponding frequency is around 1.5kHz. Combining formula (1) with curves C, D, and E, it can be seen that the actual frequency division is negatively correlated with the capacitance value of capacitor element 120-1.

[0052] Referring to Figure 3, near 200Hz, the frequency response amplitude corresponding to curve A is approximately -62dB, curve B is approximately -101dB, curve C is approximately -98dB, curve D is approximately -92dB, and curve E is approximately -85dB. That is, compared to curve A, which represents the excitation signal without frequency division, the amplitude of the signal components below 200Hz in the first electrical signal corresponding to curve B is attenuated by approximately 39dB, the amplitude of the signal components below 200Hz in the first electrical signal corresponding to curve C is attenuated by approximately 36dB, the amplitude of the signal components below 200Hz in the first electrical signal corresponding to curve D is attenuated by approximately 30dB, and the amplitude of the signal components below 200Hz in the first electrical signal corresponding to curve E is attenuated by approximately 23dB. That is, compared to the excitation signal without frequency division (corresponding to curve A), the amplitude attenuation of signal components below 200Hz in the first electrical signal after frequency division using a capacitor (corresponding to curves B, C, D, and E) is significantly greater. Thus, the low-frequency components in the excitation signal are effectively suppressed, and the first signal after frequency division effectively reduces distortion in the first loudspeaker 110.

[0053] Furthermore, compared to the first electrical signal obtained by first-order frequency division using a single capacitor (corresponding to curves B, C, D, and E), the first electrical signal obtained by second-order frequency division using two capacitors (corresponding to curve F) exhibits greater attenuation of signal components below 200Hz, resulting in better frequency division performance. As shown in Figure 3, the frequency response amplitude corresponding to curve F is approximately -110dB near 200Hz. That is, compared to curve A, which represents the excitation signal without frequency division, the amplitude of signal components below 200Hz in the first electrical signal corresponding to curve F is attenuated by approximately 48dB, demonstrating that second-order frequency division can better prevent distortion in the first speaker 110. However, curve F also exhibits significant attenuation in the high-frequency (e.g., above 8kHz) portion, corresponding to a larger attenuation of high-frequency (e.g., the first frequency band) signal components in the first electrical signal obtained through second-order frequency division, affecting the normal output of the first speaker 110 in the first frequency band. Furthermore, using two capacitors would complicate the structure of the crossover circuit 120 and increase the size of the electronic components housing it, thus increasing the manufacturing cost and size of the final sound output device 100. Therefore, to simplify the circuit and reduce system complexity, and to ensure normal output from the first speaker 110 in the first frequency band, the crossover circuit 120 can employ a first-order high-pass filter; that is, the number of capacitors 120-1 connected in series with the first speaker 110 can be only one.

[0054] By comparing curves B, C, D, and E, it can be seen that the higher the crossover frequency, the greater the amplitude attenuation of the signal components below 200Hz in the corresponding first electrical signal, resulting in a better crossover effect. However, if the crossover frequency is too high, the first frequency band component in the resulting first electrical signal will be reduced, potentially affecting the normal output of the first speaker 110 in the first frequency band. Therefore, to ensure the crossover effect while avoiding affecting the normal output of the first speaker 110 in the first frequency band, the crossover frequency needs to be limited. In some embodiments, the crossover frequency can be 6kHz-9kHz.

[0055] Considering the capacitors connected in series along curves B, C, D, and E, the smaller the capacitance of a single capacitor, the higher its corresponding crossover frequency. This results in a greater attenuation of signal components below 200Hz in the first electrical signal, leading to a better crossover effect. However, if the capacitance of the series-connected capacitors is too small, the crossover frequency will be too high, reducing the first frequency band component in the resulting first electrical signal and potentially affecting the normal output of the first speaker 110 in the first frequency band. Therefore, to ensure the crossover effect while avoiding impact on the normal output of the first speaker 110 in the first frequency band, the capacitance value of the capacitors needs to be limited.

[0056] In some embodiments, if the number of capacitor elements 120-1 connected in series with the first speaker 110 is one, in order to improve the crossover effect while ensuring the normal output of the first speaker 110 in the first frequency band, the capacitance value of the capacitor element 120-1 can be in the range of 4.2μF-5.2μF. In some embodiments, in order to further improve the crossover effect while ensuring the normal output of the first speaker 110, the capacitance value of the capacitor element 120-1 can be in the range of 4.4μF-5.0μF. In some embodiments, in order to further improve the crossover effect while ensuring the normal output of the first speaker 110, the capacitance value of the capacitor element 120-1 can be in the range of 4.5μF-4.8μF.

[0057] Please refer to curves A, B, C, D, and E in Figure 3. In the curves B, C, D, and E of the first electrical signal after frequency division, the frequency corresponding to the inflection point is the corresponding frequency division frequency. The curves before the inflection point gradually attenuate, and the attenuation amplitude increases with distance from the inflection point. The curves after the inflection point maintain an attenuation amplitude that is basically similar to that of the excitation signal (curve A) without frequency division. In curve B, the frequency response amplitude at the crossover frequency (15kHz) is approximately -85dB, and the signal component at 200Hz is attenuated by about 16dB compared to the signal component at the crossover frequency (15kHz). The frequency response amplitude of the signal component at a frequency point five octaves away from the crossover frequency (15kHz) (400kHz) is approximately -98dB, which is attenuated by about 13dB compared to the signal component at the crossover frequency (15kHz). The frequency response amplitude of the signal component at a frequency point four octaves away from the crossover frequency (15kHz) (800kHz) is approximately -95dB, which is attenuated by about 10dB compared to the signal component at the crossover frequency (15kHz). The frequency response amplitude of the signal component at a frequency point three octaves away from the crossover frequency (15kHz) (1.6kHz) is approximately -92dB, which is attenuated by about 7dB compared to the signal component at the crossover frequency (15kHz). In curve C, the frequency response amplitude at the crossover frequency (8kHz) is approximately -85.5dB, and the signal component at 200Hz is attenuated by about 15.5dB compared to the signal component at the crossover frequency (8kHz). The frequency response amplitude of the signal component at a frequency point five octaves away from the crossover frequency (8kHz) (250Hz) is approximately -97dB, and attenuated by about 11.5dB compared to the signal component at the crossover frequency (8kHz). The frequency response amplitude of the signal component at a frequency point four octaves away from the crossover frequency (8kHz) (500Hz) is... The amplitude is approximately -94dB, which is about 8.5dB less than the signal component at the crossover frequency (8kHz); the frequency response amplitude of the signal component at a frequency point (1kHz) three octaves away from the crossover frequency (8kHz) is approximately -91dB, which is about 4.5dB less than the signal component at the crossover frequency (8kHz); and the frequency response amplitude of the signal component at a frequency point (2kHz) two octaves away from the crossover frequency (8kHz) is approximately -88.3dB, which is about 2.8dB less than the signal component at the crossover frequency (8kHz).In curve D, the frequency response amplitude at the crossover frequency (3.4kHz) is approximately -83dB, and the signal component at 200Hz is attenuated by about 9dB compared to the signal component at the crossover frequency (e.g., 3.4kHz). The frequency response amplitude of the signal component at a frequency point four octaves away from the crossover frequency (3.4kHz) (200Hz) is approximately -92dB, which is attenuated by about 9dB compared to the signal component at the crossover frequency (8kHz). The frequency response amplitude of the signal component at a frequency point three octaves away from the crossover frequency (3.4kHz) (400Hz) is approximately -89dB, which is attenuated by about 6dB compared to the signal component at the crossover frequency (8kHz). The frequency response amplitude of the signal component at a frequency point two octaves away from the crossover frequency (3.4kHz) (850Hz) is approximately -86dB, which is attenuated by about 3dB compared to the signal component at the crossover frequency (3.4kHz). In curve E, the frequency response amplitude at the crossover frequency (1.5kHz) is approximately -79dB, and the signal component at 200Hz is attenuated by about 6dB compared to the signal component at the crossover frequency (e.g., 1.5kHz). The frequency response amplitude of the signal component at a frequency point three octaves away from the crossover frequency (1.5kHz) (180Hz) is approximately -85.1dB, which is attenuated by about 6.1dB compared to the signal component at the crossover frequency (1.5kHz). The frequency response amplitude of the signal component at a frequency point two octaves away from the crossover frequency (1.5kHz) (375Hz) is approximately -82dB, which is attenuated by about 3dB compared to the signal component at the crossover frequency (1.5kHz). The frequency response amplitude of the signal component at a frequency point one octave away from the crossover frequency (1.5kHz) (750Hz) is approximately -80dB, which is attenuated by about 1dB compared to the signal component at the crossover frequency (1.5kHz). In summary, in the first electrical signal obtained after frequency division, the signal components at frequencies that are further away from the division frequency by an octave band exhibit greater attenuation compared to the signal components at the division frequency. Furthermore, signal components with frequencies below the distortion frequency exhibit greater attenuation compared to the signal components at the division frequency. This means that signal components in the second frequency band (e.g., frequencies below 200Hz) that are far from the division frequency have smaller amplitudes. Consequently, the first electrical signal obtained after frequency division contains fewer components below the distortion frequency, resulting in fewer signal components in the second frequency band received by the first speaker 110, thus effectively preventing distortion in the first speaker 110.

[0058] In some embodiments, to prevent the first speaker 110 from distorting in the second frequency band, the signal components in the first electrical signal with frequencies lower than the distortion frequency of the first speaker 110 are attenuated by at least 30 dB compared to the signal components at the crossover frequency. In some embodiments, to further reduce the probability of the first speaker 110 distorting in the second frequency band, the signal components in the first electrical signal with frequencies lower than the distortion frequency are attenuated by at least 35 dB compared to the signal components at the crossover frequency. In some embodiments, to further reduce the probability of the first speaker 110 distorting in the second frequency band, the signal components in the first electrical signal with frequencies lower than the distortion frequency are attenuated by at least 40 dB compared to the signal components at the crossover frequency.

[0059] In some embodiments of this specification, by setting the frequency division range and the capacitance value range of the capacitor element to the aforementioned ranges, the amplitude attenuation effect of the second frequency band component in the first electrical signal generated after the excitation signal is processed by the frequency division circuit is better, which can prevent the first speaker from distorting as much as possible. At the same time, the first electrical signal after frequency division retains as much of the first frequency band component as possible, which can ensure the normal output of the first speaker.

[0060] It should be understood that the framework diagram provided in Figure 1 is for illustrative purposes only and is not intended to limit the scope of this specification. Various modifications and variations can be made by those skilled in the art under the guidance of this specification, and all such modifications and variations will fall within the scope of protection of this specification. In some embodiments, the number of elements shown in Figure 1 may be adjusted according to actual circumstances. In some embodiments, one or more elements shown in Figure 1 may be omitted, or one or more other elements may be added or deleted. For example, the sound output device 100 may not include the support structure 140, and the housing 130 may have the wearing fixation function of the support structure 140. In some embodiments, an element may be replaced by another element that can achieve a similar function. In some embodiments, an element may be divided into multiple sub-elements, or multiple elements may be combined into a single element. For example, the housing 130 and the support structure 140 may be combined into one element.

[0061] Figure 4 is an exemplary structural diagram of a first loudspeaker and a second loudspeaker according to some embodiments of this specification.

[0062] As shown in Figure 4, the first loudspeaker 110 includes a first diaphragm 110-1, and a first front cavity 110-2 and a first rear cavity 110-3 are respectively isolated on both sides of the vibration direction of the first diaphragm 110-1. The first front cavity 110-2 of the first loudspeaker is connected to the outside through the first sound guide hole 110-4. The second loudspeaker 150 includes a second diaphragm 150-1, and a second front cavity 150-2 and a second rear cavity 150-3 are respectively isolated on both sides of the vibration direction of the second diaphragm 150-1. The second front cavity 150-2 of the second loudspeaker 150 is connected to the outside through the second sound guide hole 150-4.

[0063] In some embodiments, the first speaker 110 radiates sound to the outside of the housing 130 through the first sound guide hole 110-4, and in the wearing state, the first sound guide hole 110-4 corresponding to the first speaker 110 faces the user's ear canal opening (i.e., the first sound guide hole 110-4 is disposed on the side wall of the housing 130 facing the user's ear canal opening in the wearing state). Orienting the first sound guide hole 110-4 towards the user's ear canal opening can improve the user's hearing effect of the sound output from the first speaker 110, allowing the user's ear canal opening to receive a larger volume, thus providing a clearer listening experience. Through the arrangement of the first speaker 110 and its corresponding first sound guide hole 110-4, the output sound pressure level of the sound output device 100 in the first frequency band (e.g., 8kHz-16kHz) can be increased, ensuring the output effect of the sound output device 100 in the first frequency band.

[0064] In some embodiments, the second speaker 150 radiates sound to the outside of the housing 130 through the second sound guide hole 150-4, and when worn, the second sound guide hole 150-4 corresponding to the second speaker 150 faces the user's ear canal opening.

[0065] In some embodiments, the second rear cavity 150-3 of the second speaker 150 may also be provided with a third sound guide hole 150-5, which communicates with the outside. The second sound guide hole 150-4 can connect to the second front cavity 150-2, and guides the sound generated by the second front cavity 150-2 out of the housing 130 and into the user's ear canal, allowing the user to hear the sound. In some embodiments, the second sound guide hole 150-4 and the third sound guide hole 150-5 are located on opposite sides of the second diaphragm 150-1 of the second speaker 150, with the third sound guide hole 150-5 positioned relative to the user's ear canal opening. As an example only, as shown in Figure 4, the second sound guide hole 150-4 can be disposed on the side wall of the second front cavity 150-2 of the second speaker 150 facing the user's ear canal opening, and the third sound guide hole 150-5 can be disposed on the side wall of the second rear cavity 150-3 of the second speaker 150 away from the user's ear canal opening, so that when the sound output device 100 is worn, the second sound guide hole 150-4 faces the user's ear canal opening, and the third sound guide hole 150-5 faces away from the user's ear canal opening.

[0066] In some embodiments, a portion of the sound emitted through the second sound guide hole 150-4 can propagate to the ear canal so that the user can hear the sound, while another portion, together with the sound reflected through the ear canal, can propagate through the gap between the housing 130 and the ear to the sound output device 100 and the outside of the ear, thereby forming a first sound leakage in the far field. At the same time, the third sound guide hole 150-5 opened on other sides of the housing 130 (e.g., the side away from or opposite to the user's ear canal) is farther away from the ear canal than the second sound guide hole 150-4. The sound propagated from the third sound guide hole 150-5 generally forms a second sound leakage in the far field. The intensity of the first sound leakage is comparable to that of the second sound leakage, and the phases of the first sound leakage and the second sound leakage are (close to) opposite to each other, so that the two can cancel each other out of phase in the far field. This is beneficial to achieving a sound leakage reduction effect of the sound output device 100 in the mid-low frequency range (e.g., the second frequency range), so that the sound output device 100 exhibits dipole directivity in the mid-low frequency range.

[0067] In some embodiments, as shown in FIG4, the first rear cavity 110-3 of the first speaker 110 is not connected to the outside, and the first rear cavity 110-3 and the second front cavity 150-2 are separated by a partition 131, so that the first rear cavity 110-3 and the second front cavity 150-2 are not connected. In some embodiments, the magnetic conductor in the structure of the first speaker 110 can serve as the partition 131, which is configured to separate the first rear cavity 110-3 and the second front cavity 150-2. By separating the first rear cavity 110-3 and the second front cavity 150-2 by the partition 131, the transmission of sound from the second front cavity 150-2 to the first rear cavity 110-3, or the transmission of sound from the first rear cavity 110-3 to the second front cavity 150-2, can be minimized, thereby avoiding mutual interference between the sound generated by the first speaker 110 and the second speaker 150 and improving the full-frequency output quality of the sound output device 100.

[0068] In some embodiments, when the first rear cavity 110-3 is closed, during the vibration of the first diaphragm 110-1, since the first front cavity 110-2 is connected to the outside through the first sound guide hole 110-4, while the first rear cavity 110-3 is not connected to the outside, an air pressure imbalance may occur between the first front cavity 110-2 and the first rear cavity 110-3. This results in an unbalanced vibration and excessive amplitude of the first diaphragm 110-1, causing distortion in the first speaker 110. In some embodiments, to reduce the occurrence of the above situation, a sound guide hole 110-5 can be provided on the first rear cavity 110-3 of the first speaker 110, through which the first rear cavity 110-3 communicates with the outside.

[0069] Figure 5 is an exemplary structural schematic diagram of a first loudspeaker according to some embodiments of this specification. In some embodiments, as shown in Figure 5, the first rear cavity 110-3 of the first loudspeaker 110 includes an inner magnet 610 and an outer magnet 620 surrounding the inner magnet 610. In some embodiments, a sound inlet 110-5 may penetrate the inner magnet 610 so that the first rear cavity 110-3 communicates with the outside through the sound inlet 110-5.

[0070] When the diameter of the sound-guiding hole 110-5 is set too large, the volume and effective magnetic area of ​​the inner magnet 610 will be small, affecting the magnetic field strength of the inner magnet 610 at the voice coil and thus the output of the sound output device 100. When the diameter of the sound-guiding hole 110-5 is set too small, the manufacturing process will be more difficult and the airtightness will be poor. Therefore, in some embodiments, in order to reduce the manufacturing difficulty while ensuring the magnetic field strength of the inner magnet 610 to guarantee the output of the sound output device 100, the diameter of the sound-guiding hole 110-5 can be 0.3mm-0.8mm. In some embodiments, in order to further reduce the manufacturing difficulty, the diameter of the sound-guiding hole 110-5 can be 0.4mm-0.7mm. In some embodiments, in order to further ensure the magnetic field strength of the inner magnet 610, the diameter of the sound-guiding hole 110-5 is 0.45mm-0.6mm.

[0071] In some embodiments, to reduce manufacturing complexity while maintaining the magnetic field strength of the inner magnet 610 to ensure the output of the sound output device 100, the ratio of the opening area of ​​the sound-guiding hole 110-5 to the area of ​​the inner magnet 610 can be 0.02-0.08. In some embodiments, to further reduce manufacturing complexity, the ratio of the opening area of ​​the sound-guiding hole 110-5 to the area of ​​the inner magnet 610 can be 0.03-0.07. In some embodiments, the ratio of the opening area of ​​the sound-guiding hole 110-5 to the area of ​​the inner magnet 610 can be 0.04-0.06. Wherein, the opening area of ​​the sound-guiding hole 110-5 is the area of ​​its opening along its axial direction, and the area of ​​the inner magnet 610 is the area of ​​the projection of the inner magnet 610 onto the axial direction of the sound-guiding hole 110-5.

[0072] Figure 6 is an exemplary structural schematic diagram of a first loudspeaker and a second loudspeaker according to some other embodiments of this specification. The difference between the sound output device 100 shown in Figure 6 and the sound output device 100 shown in Figure 4 is that the first rear cavity 110-3 is connected to the second front cavity 150-2 of the second loudspeaker 150 through a sound inlet 110-5. Since the second front cavity 150-2 is connected to the outside, the first rear cavity 110-3 is also connected to the outside, so that the air pressure of the first rear cavity 110-3 and the first front cavity 110-2 of the first loudspeaker 110 is balanced, ensuring the vibration balance of the first diaphragm 110-1 of the first loudspeaker 110, thereby effectively improving the problem of distortion when the first loudspeaker 110 receives the second frequency band input signal.

[0073] In some embodiments, since the first rear cavity 110-3 of the first loudspeaker 110 is connected to the second front cavity 150-2 of the second loudspeaker 150 through the sound inlet 110-5, sound in the first rear cavity 110-3 may propagate to the second front cavity 150-2 through the sound inlet 110-5, or sound in the second front cavity 150-2 may propagate to the first rear cavity 110-3 through the sound inlet 110-5. If the acoustic impedance of the sound inlet 110-5 is too small, it may cause significant interference between the sound generated by the first loudspeaker 110 and the sound generated by the second loudspeaker 150. If the acoustic impedance of the sound inlet 110-5 is too large, it may not be able to properly balance the air pressure between the first rear cavity 110-3 and the first front cavity 110-2. In some embodiments, in order to minimize the interference between the sound generated by the first speaker 110 and the sound generated by the second speaker 150, and to achieve a better balance of air pressure between the first front cavity 110-2 and the first rear cavity 110-3, the acoustic impedance of the sound inlet 110-5 can be 5×10⁻⁶. 8 Pa·s / m⁻¹.3×10⁻¹ 9 Pa·s / m. In some embodiments, to further avoid mutual interference between the sound generated by the first rear cavity 110-3 and the second front cavity 150-2, the acoustic impedance of the sound inlet 110-5 is 7×10⁻⁶. 8 Pa·s / m⁻¹×10 9 Pa·s / m. In some embodiments, to further achieve a better balance of air pressure between the first front cavity 110-2 and the first rear cavity 110-3, the acoustic impedance of the sound inlet 110-5 is 8 × 10⁻⁶. 8 Pa·s / m⁻⁹×10⁻⁶ 8 Pa·s / m. The acoustic impedance of the sound inlet 110-5 can be measured based on the national group standard T / CECA 79—2023, "Method for measuring acoustic impedance of waterproof membrane die-cut parts for electroacoustic transducers". This manual does not impose too many restrictions or explanations on this.

[0074] In some embodiments, an acoustic barrier mesh may be provided on the peripheral or outer sidewall of the sound hole 110-5 to adjust the acoustic resistance of the sound hole 110-5. The outer sidewall of the sound hole 110-5 refers to the sidewall surface facing the second front cavity 150-2 of the second loudspeaker 150.

[0075] When the diameter of the sound-guiding hole 110-5 is set too large, the acoustic impedance of the sound-guiding hole 110-5 will be too small, making it impossible to effectively prevent the sound generated by the first rear cavity 110-3 and the second front cavity 150-2 from interfering with each other. When the diameter of the sound-guiding hole 110-5 is set too small, it will increase the difficulty of airflow, resulting in an excessively large acoustic impedance of the sound-guiding hole 110-5, which may not be able to properly balance the air pressure between the first rear cavity 110-3 and the first front cavity 110-2. Therefore, in some embodiments, in order to make the sound-guiding hole 110-5 have a suitable acoustic impedance, the diameter of the sound-guiding hole 110-5 can be 0.95mm-1.1mm.

[0076] Figure 7 is an exemplary structural diagram of another first and second loudspeaker according to some embodiments of this specification.

[0077] In some embodiments, in order to achieve air pressure balance between the first rear cavity 110-3 and the first front cavity 110-2, and to avoid mutual interference between the sounds generated by the first rear cavity 110-3 and the second front cavity 150-2, as shown in FIG7, the first rear cavity 110-3 of the first loudspeaker 110 may be provided with a sound inlet 110-5, and one end of the sound inlet 110-5 is connected to the first rear cavity 110-3, and the other end of the sound inlet 110-5 is provided with a sound guide tube 110-6. The first rear cavity 110-3 can be connected to the outside through the sound guide tube 110-6, and the sound guiding channel of the sound guide tube 110-6 is isolated from the second front cavity 150-2.

[0078] In some embodiments of this specification, by providing a sound guide tube in the first rear cavity, the first rear cavity of the first loudspeaker is connected to the outside, thereby balancing the air pressure between the first rear cavity and the first front cavity, and balancing the vibration of the first diaphragm of the first loudspeaker. This effectively improves the problem of distortion in the second frequency band. Simultaneously, since the sound guide tube's sound channel is isolated from the second front cavity, the sound generated in the first rear cavity and the sound generated in the second front cavity will not interfere with each other.

[0079] In some embodiments, while the excitation signal is divided by the frequency divider circuit 120, the first rear cavity 110-3 can be connected to the outside through the sound inlet 110-5 to further improve the problem of distortion when the first speaker 110 receives the second frequency band input signal.

[0080] The basic concepts have been described above. Obviously, for those skilled in the art, the detailed disclosure above is merely illustrative and does not constitute a limitation of this application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are suggested in this application, and therefore remain within the spirit and scope of the exemplary embodiments of this application.

[0081] Furthermore, this application uses specific terms to describe embodiments of the application. For example, "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that "an embodiment," "one embodiment," or "an alternative embodiment" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0082] Similarly, it should be noted that, in order to simplify the description of the present application and thus aid in the understanding of one or more embodiments of the invention, the foregoing description of the embodiments of the present application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of the application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

[0083] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

[0084] Finally, it should be understood that the embodiments described in this application are merely illustrative of the principles of the embodiments of this application. Other modifications may also fall within the scope of this application. Therefore, alternative configurations of the embodiments of this application are considered as examples and not limitations, and are regarded as consistent with the teachings of this application. Accordingly, the embodiments of this application are not limited to the embodiments explicitly described and illustrated in this application.

Claims

1. A sound output device, comprising: a first speaker configured to generate sound of a first frequency band in response to a first electrical signal; a frequency dividing circuit configured to perform frequency dividing processing on an excitation signal to generate the first electrical signal, the frequency dividing circuit being configured to suppress signal components of the excitation signal having a frequency lower than a frequency dividing frequency, so that signal components of the generated first electrical signal having a frequency lower than a break-up frequency of the first speaker are attenuated by a preset magnitude compared to signal components of the excitation signal having a frequency lower than the break-up frequency; a housing configured to accommodate the first speaker and the frequency dividing circuit; a support structure configured to wear the housing near an ear canal opening of a user without blocking the ear canal opening. 2.The voice output apparatus of claim 1, wherein, The signal components of the first electrical signal having a frequency lower than the break-up frequency are attenuated by at least 30 dB compared to signal components at the frequency dividing frequency. 3.The voice output apparatus of claim 1, wherein, The break-up frequency is less than or equal to 200 Hz. 4.The voice output apparatus of claim 1, wherein, The preset magnitude is greater than or equal to 20 dB. 5.The voice output apparatus of claim 1, wherein, The frequency dividing frequency ranges from 6 kHz to 9 kHz. 6.The voice output apparatus of claim 5, wherein, The frequency dividing frequency ranges from 7.5 kHz to 8.5 kHz.

7. The sound output device as claimed in claim 6, wherein, The frequency dividing circuit includes a capacitive element connected in series with the first speaker, and the capacitive element has a capacitance ranging from 4.2 μF to 5.2 μF.

8. The sound output apparatus of any one of claims 1-7, wherein, The sound output device further comprises a second speaker for generating sound of a second frequency band, the second frequency band having a frequency less than that of the first frequency band; wherein, The first speaker includes a first diaphragm, and two sides of a vibration direction of the first diaphragm are isolated to form a first front cavity and a first rear cavity, respectively, and the first front cavity of the first speaker is in communication with the outside through a first sound guide hole; The second speaker includes a second diaphragm, and two sides of a vibration direction of the second diaphragm are isolated to form a second front cavity and a second rear cavity, respectively, and the second front cavity of the second speaker is in communication with the outside through a second sound guide hole. 9.The voice output apparatus of claim 8, wherein, The first speaker is accommodated in the housing, the first rear cavity of the first speaker is closed, and the first rear cavity and the second front cavity are separated by a partition. 10.The voice output apparatus of claim 8, wherein, The first rear cavity of the first speaker is provided with a sound guide hole, and the first rear cavity is in communication with the outside through the sound guide hole. 11.The voice output apparatus of claim 10, wherein, The sound guide hole has a diameter of 0.3 mm to 0.8 mm. 12.The voice output apparatus of claim 10, wherein, An inner magnet is arranged in the first rear cavity, the sound guide hole penetrates the inner magnet to enable the first rear cavity to communicate with the outside through the sound guide hole, and a ratio of an opening area of the sound guide hole to an area of the inner magnet is 0.02 to 0.

08. 13.The voice output apparatus of claim 12, wherein, One end of the sound guide hole is in communication with the first rear cavity, and the other end of the sound guide hole is in communication with the second front cavity. 14.The voice output apparatus of claim 13, wherein, A sound resistance net is arranged on a circumferential side wall or an outer side wall of the sound guide hole, and the sound resistance of the sound guide hole is 5 × 108 Pa·s / m to 1.3 × 109 Pa·s / m. 15.The voice output apparatus of claim 10, wherein, One end of the sound guide hole is in communication with the first rear cavity, the other end of the sound guide hole is provided with a sound guide tube, the first rear cavity is in communication with the outside through the sound guide tube, and a sound guide channel of the sound guide tube is isolated from the second front cavity. 16.The voice output apparatus of claim 8, wherein, The second speaker generates the sound of the second frequency band in response to a second electrical signal, the second electrical signal comprising: the excitation signal, or a signal formed by low-pass filtering the excitation signal.

17. A sound output device comprising: a first speaker configured to output sound of a first frequency band; the first speaker comprises a first diaphragm, two sides of a vibration direction of the first diaphragm are isolated to form a first front cavity and a first back cavity respectively, and the first front cavity of the first speaker is in communication with the outside through a first sound guide hole; a second speaker configured to output sound of a second frequency band, the second frequency band having a frequency less than that of the first frequency band; the second speaker comprises a second diaphragm, two sides of a vibration direction of the second diaphragm are isolated to form a second front cavity and a second back cavity respectively, and the second front cavity of the second speaker is in communication with the outside through a second sound guide hole; a housing configured to accommodate the first speaker and the second speaker; a support structure configured to wear the housing near the ear canal of a user but not to block the ear canal opening; wherein the first back cavity is provided with a sound guide hole, one end of the sound guide hole is in communication with the first back cavity, and the other end of the sound guide hole is in communication with the second front cavity.

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