Direct-drive type six-loudspeaker headphone acoustic structure and driving method

Abstract

The present application provides a direct-drive type six-loudspeaker headphone acoustic structure and a driving method. The direct-drive type six-loudspeaker headphone acoustic structure comprises loudspeaker discs that are respectively and symmetrically arranged on the left and right sides. The loudspeaker discs on the two sides are each provided with: a main loudspeaker, used for playing back a main sound signal, wherein the main sound signal is formed by fitting a heavy bass sound channel signal, a middle-front sound channel signal, and a one-way front sound channel signal; a first auxiliary loudspeaker, used for playing back a one-way side sound channel signal; and a second auxiliary loudspeaker, used for playing back a one-way rear sound channel signal, wherein the center of the main loudspeaker is arranged to deviate from the center of the disc body of the corresponding loudspeaker disc, and the distance between the first auxiliary loudspeaker and the main loudspeaker is less than the distance between the second auxiliary loudspeaker and the main loudspeaker. The present application solves the problem in the prior art of a poor playback effect of an audio caused when using two sound channels to output sound for playback.

Description

A direct-push six-speaker headphone acoustic structure and driving method Technical Field

[0001] The present application relates to the technical field of audio playback equipment, and in particular to an acoustic structure and driving method of a direct-push six-speaker headphone. Background Art

[0002] Audio formats include 2-channel, 2.1-channel, 3.1-channel, 5.1-channel, and 7.1-channel, and are widely used for the dissemination and enjoyment of music, movies, games, and other fields. Existing headphones typically feature two speakers, or multiple speakers with a traditional crossover, creating a two-channel stereo sound model. Multi-channel audio is virtually mixed into a two-channel sound output, resulting in missing, mixed, and distorted multi-channel audio signal playback. This creates a false sense of hearing and confusion for users, preventing them from hearing the real sound. Consequently, existing two-channel audio output systems result in poor audio playback.

[0003] Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of this application is to provide an acoustic structure and driving method for a direct-push six-speaker headphone, which solves the problem of poor audio playback when two-channel sound output is used for playback in the prior art.

[0005] On the one hand, the present application provides a direct-push six-speaker headphone acoustic structure, comprising: speaker plates symmetrically arranged on the left and right sides, each of which is provided with:

[0006] Main speaker, the main speaker is used to play the main sound signal, the main sound signal is fitted by the subwoofer channel signal, the center front channel signal, and the unidirectional front channel signal;

[0007] a first auxiliary speaker, the first auxiliary speaker being used to play a unidirectional side channel signal;

[0008] A second auxiliary speaker, the second auxiliary speaker is used to play a unidirectional rear channel signal;

[0009] The center of the main speaker is arranged away from the center of the speaker plate, and the distance between the first auxiliary speaker and the main speaker is smaller than the distance between the second auxiliary speaker and the main speaker.

[0010] Optionally, the surface of the speaker plate facing away from the sound-emitting side is configured as an arc-shaped surface, with an arc-shaped low point on the arc-shaped surface;

[0011] The speaker plane of the main speaker, the speaker plane of the first auxiliary speaker and the speaker plane of the second auxiliary speaker are all inclined toward the lower point of the arc.

[0012] Optionally, the tilt angles of the main speaker, the first auxiliary speaker and the second auxiliary speaker are all equal.

[0013] Optionally, in the left and right directions, the distance from the center point of the main speaker to the lowest point of the arc, the distance from the center point of the first auxiliary speaker to the lowest point of the arc, and the distance from the center point of the second auxiliary speaker to the lowest point of the arc are all equal.

[0014] Optionally, the speaker plate has a vertical center line, and the first auxiliary speaker and the second auxiliary speaker are respectively arranged on both sides of the vertical center line.

[0015] Optionally, the first auxiliary speaker and the second auxiliary speaker are both arranged in a sealed cavity on the speaker plate.

[0016] Optionally, the sound pressure level of the main speaker is: 110±10dB, the frequency response is 20Hz ‑ 20KHz±10dB, and the lowest resonant frequency is 80Hz;

[0017] The first auxiliary speaker and the second auxiliary speaker have the same specifications. The sound pressure level of the first auxiliary speaker is 110±10dB, the frequency response is 20Hz ‑ 20KHz ±10dB, and the lowest resonance frequency is 240Hz.

[0018] On the other hand, the present application also proposes a driving method for a direct-push six-speaker headphone, comprising the steps of:

[0019] Receive a multi-channel audio signal and separate each audio channel signal, wherein each audio channel includes at least: a subwoofer channel signal, a center front channel signal, a unidirectional front channel signal, a unidirectional side channel signal, and a unidirectional rear channel signal;

[0020] Performing characterization processing on each audio channel signal separately, and fitting the three channels of the characterized processed heavy bass channel signal, the mid-front channel signal, and the unidirectional front channel signal into the main channel signal;

[0021] The main channel signal is output to the main speaker on the corresponding side, the unidirectional side channel signal after characteristic processing is output to the first auxiliary speaker on the corresponding side, and the rear channel signal after characteristic processing is output to the second auxiliary speaker on the corresponding side.

[0022] Optionally, the step of individually performing characterization processing on each audio channel signal specifically includes:

[0023] Based on the frequency response characteristics of the speaker, the frequency points of the channel signal are supplemented through the spectrum sub-algorithm to obtain a high-fidelity restoration signal;

[0024] Based on the position and tilt characteristics of the speaker, the phase parameters of the channel signal are adjusted through the phase sub-algorithm to eliminate power cancellation and mixing caused by sound phase misalignment;

[0025] The angle sub-algorithm is used to adjust the sound angle of the high-fidelity restored signal after phase adjustment, so that the sound energy is focused on the ears;

[0026] Based on the position angle and the time difference caused by signal processing, the delay sub-algorithm adjusts the time characteristics of the high-fidelity restored signal after the sound angle adjustment to synchronize the multi-channel sound entering the ear;

[0027] The gain sub-algorithm adjusts the volume of the high-fidelity restored signal after time characteristic adjustment to adapt to the sensitivity of the corresponding speaker.

[0028] Optionally, in the step of receiving a multi-channel audio signal and separating each audio channel signal:

[0029] Use the USB interface to directly obtain the multi-channel audio signal of the external audio output interface.

[0030] Beneficial Effects: The acoustic structure and driving method of the direct-push six-speaker headphone in this application directly obtains a multi-channel audio signal and fits the subwoofer channel signal, the center front channel signal, and the unidirectional front channel signal into a single channel output, so that the eight-channel audio signal is output separately through the six speakers on the left and right sides, thereby achieving true playback of multi-channel audio. Each channel of the multi-channel audio can be clearly played back through the six speakers, and the sound is sent to each correct speaker unit, achieving high sound separation, clear playback, no distortion, and accurate positioning. The original clarity, layering, spatial sense, positioning and other panoramic elements of the sound are realistically and perfectly presented, ensuring that the user has a real, comfortable and transparent experience. Moreover, while achieving a realistic sound experience, the two front center speakers and two woofers are eliminated by fitting the channels. The four redundant speakers on the left and right are eliminated, reducing weight and cost, making the user feel light and comfortable to wear, reducing fatigue, and allowing for long periods of listening, easy and natural. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic structural diagram of the main parts of an acoustic structure of a direct-push six-speaker headphone according to an embodiment of the present application;

[0032] FIG2 is an orthographic projection view of the main parts of the acoustic structure of a direct-push six-speaker headphone according to an embodiment of the present application on a sound-emitting vertical plane;

[0033] FIG3 is an orthographic projection view of the main part of the acoustic structure of a direct-push six-speaker headphone according to an embodiment of the present application, with a curved surface schematically shown on the sound-emitting vertical plane;

[0034] FIG4 is a schematic diagram showing the principle of the main parts of the acoustic structure of a direct-push six-speaker headphone according to an embodiment of the present application;

[0035] FIG5 is a flowchart of the main steps of a driving method for a direct-push six-speaker headphone according to an embodiment of the present application;

[0036] FIG6 is a schematic diagram illustrating the implementation principle of a driving method for a direct-push six-speaker headphone according to an embodiment of the present application;

[0037] FIG7 is a flowchart illustrating a method for driving a direct-push six-speaker headphone according to an embodiment of the present application for characterizing a unidirectional side channel signal and a unidirectional rear channel signal;

[0038] FIG8 is a flowchart of characterization processing and fitting of main channel signals in a driving method for a direct-drive six-speaker headphone according to an embodiment of the present application;

[0039] FIG9 is a schematic diagram showing the principle of audio signal output in a driving method for a direct-push six-speaker headphone according to an embodiment of the present application.

[0040] In the figure: 100, speaker plate; 110, curved surface; 111, arc low point; 112, sound vertical surface; 120, plate center; 130, vertical center line; 140, horizontal center line; 150, tuning hole; 200, main speaker; 210, tilt angle; 300, first auxiliary speaker; 400, second auxiliary speaker; 500, direct push connector; 600, digital-to-analog converter; 610, headphone amplifier. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions and advantages of this application clearer and more explicit, the following further describes this application in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain this application and are not intended to limit this application.

[0042] When two-channel sound output is used for playback in the prior art, not only is there a problem of poor audio playback effect. If full-channel output is used, a speaker needs to be set up for each channel, which means that ten speakers need to be installed on the entire headset, resulting in many speakers on the headset and a large weight. Not only is the cost high, but long-term wear can easily make the user tired. In addition, the signal input interface used in current multi-channel output devices usually only supports dual-channel output, and a driver needs to be installed to support the input of multi-channel audio. The driver is used to obtain multiple channel signals, resulting in large signal delays and poor user experience. In games, situations where the distance of a position is predicted by sound will be affected by large delays and virtual sounds, resulting in misjudgments. Therefore, the following embodiments are proposed:

[0043] One implementation method is:

[0044] As shown in Figures 1, 6, and 8, this embodiment proposes a direct-push six-speaker headphone acoustic structure that can play multi-channel audio. The 7.1-channel format audio is used as an example for specific description. The 7.1-channel format audio is divided into: a subwoofer channel signal, a center front channel signal, a left front channel signal, a left channel signal, a left rear channel signal, a right front channel signal, a right channel signal, and a right rear channel signal, for a total of eight channel signals. Ideally, an ideal sound playback effect can be achieved by setting eight different speakers in the corresponding direction positions of the user and the speakers at different positions correspondingly playing the corresponding channel signals. However, when applied to headphones, due to the small size of the headphones and the short sound reception distance, improvements are needed. As shown in Figures 1, 2 and 4, the acoustic structure of the direct-push six-speaker headphone in this embodiment mainly includes: speaker discs 100 symmetrically arranged on the left and right sides respectively, and the speaker discs 100 on the left and right sides are used to fix each speaker. Since the speaker discs 100 on the left and right sides and the speakers thereon are symmetrically arranged, the structure is described using the speaker disc 100 on one side as an example, and the multi-channel sound signals are classified, among which the subwoofer channel signal and the front and center channel signal can be shared by the speakers on the left and right sides. In order to distinguish the difference between the left and right channels, one-way is used to represent the left or right side. In this embodiment, the left speaker of the earphone is used for description. Unless otherwise specified, one-way refers to the left side. The side of the speaker facing the user's ear is the sounding side, and the side of the speaker disc 100 facing the user's ear is the sounding vertical surface 112. The structure is described with the sounding vertical surface 112 in a vertical state.

[0045] As shown in Figures 1, 2, and 4, the speaker pans 100 on both sides of this embodiment are each equipped with: a main speaker 200, a first auxiliary speaker 300, and a second auxiliary speaker 400. Specifically, the orthographic projection of the speaker pan 100 onto the sound-emitting vertical plane 112 can be circular, elliptical, or even a rounded shape. When the earphones are worn, the entire speaker pan 100 covers the user's ears. The center of the orthographic projection of the speaker pan 100 onto the sound-emitting vertical plane 112 serves as the pan center 120 of this structure. When the earphones are in use, the pan center 120 aligns with the user's earholes, achieving an ideal wearing state. When the earphones are worn, a vertical centerline 130 is defined by a line passing through the pan center 120, while a horizontal centerline 140 is defined by a line passing through the pan center 120. This forms a rectangular coordinate system, and the dimensions of each speaker in this embodiment are defined based on this coordinate system.

[0046] In this embodiment, the main speaker 200 is used to play the main sound signal, which is formed by fitting the subwoofer channel signal, the center front channel signal, and the unidirectional front channel signal. The first auxiliary speaker 300 is used to play the unidirectional side channel signal, and the second auxiliary speaker 400 is used to play the unidirectional rear channel signal. Specifically, on the left side of the headset, the subwoofer channel signal, the center front channel signal, and the left front channel signal are fitted to form the main sound signal. The three speakers on the left side play the main sound signal, the left side channel signal, and the left rear channel signal, respectively. On the right side of the headset, the subwoofer channel signal, the center front channel signal, and the right front channel signal are fitted to form the main sound signal. The three speakers on the right side play the main sound signal, the right side channel signal, and the right rear channel signal, respectively. The subwoofer channel signal and the center front channel signal participate in the channel fitting process on both the left and right sides, respectively. Therefore, six speakers can achieve 7.1 channel audio playback with 8 channels.

[0047] As shown in FIG2 and FIG4 , in this embodiment, in the orthographic projection of the speaker plate 100 onto the sound-emitting vertical plane 112, the center of the main speaker 200 is offset from the center 120 of the speaker plate 100. The center of the main speaker 200 is located below and in front of the center 120, the center of the first auxiliary speaker 300 is located above and in front of the center 120, and the center of the second auxiliary speaker 400 is located above and behind the center 120. Furthermore, the distance from the center of the main speaker 200 to the center 120 is smaller than the distance from the center of the first auxiliary speaker 300 to the center 120, and the distance from the center of the main speaker 200 to the center 120 is smaller than the distance from the center of the second auxiliary speaker 400 to the center 120. Consequently, the main speaker 200 is closer to the center 120, while the first and second auxiliary speakers 300 and 400 are farther away from the center 120. This configuration shortens the path of the main sound signal toward the user's ear, resulting in clearer sound. The unidirectional side channel signal played by the first auxiliary speaker 300 is closer to the user's ear, reproducing the effect of sound input from the side and more realistically reproducing the unidirectional side channel signal. The second auxiliary speaker 400 receives the unidirectional rear channel signal, positioned behind the user's ear, thereby reproducing the effect of sound input from behind and more realistically reproducing the unidirectional rear channel signal. The distance between the first auxiliary speaker 300 and the main speaker 200 is shorter than the distance between the second auxiliary speaker 400 and the main speaker 200. Consequently, the distance from the first auxiliary speaker 300 to the user's ear is shorter than that from the second auxiliary speaker 400, simulating the positional relationship of the first auxiliary speaker 300 at the side of the ear and the second auxiliary speaker 400 at the back of the ear. The placement positions of the main speaker 200, the first auxiliary speaker 300 and the second auxiliary speaker 400 on the speaker plate 100 are matched with the directions of the sounds of their respective channel signals. Different channel directions are reflected by the placement positions of the speakers in the headphones, thereby achieving a better playback effect.

[0048] As shown in Figures 1, 2, and 5, a direct-push six-speaker headphone acoustic structure in this embodiment directly obtains a multi-channel audio signal. For the output sound on one side, the subwoofer channel signal, the center-front channel signal, and the unidirectional front channel signal on that side are fitted into a single channel output, the unidirectional side channel signal on that side is output as a separate channel, and the unidirectional rear channel signal on that side is output as a separate channel. For the output sound on the other side, the subwoofer channel signal, the center-front channel signal, and the unidirectional front channel signal on the other side are fitted into a single channel output, the unidirectional side channel signal on the other side is output as a separate channel, and the unidirectional rear channel signal on the other side is output as a separate channel. As a result, the eight-channel audio signal is output separately through the six speakers on the left and right sides, thereby achieving true playback of multi-channel audio. The specially designed distribution of the main speaker 200, the first auxiliary speaker 300, and the second auxiliary speaker 400 on the speaker tray 100 ensures that the six speakers can clearly play back each channel of the multi-channel audio, delivering sound to the correct speakers. This results in high sound separation, clear playback, no distortion, and accurate positioning. This ensures that the original clarity, layering, spatial perception, and positioning of the sound are fully and faithfully presented, ensuring a realistic, comfortable, and transparent experience for the user. Furthermore, while achieving a realistic sound experience, the two front center speakers and two woofers have been eliminated through channel matching. Eliminating these four redundant speakers on both sides reduces weight and cost, making the wearer feel light and fatigue-free, ensuring a natural and authentic listening experience over extended periods of time.

[0049] As shown in Figures 1, 3, and 4, the surface of the speaker plate 100 in this embodiment, facing away from the sound-emitting side, is configured as a curved surface 110. This curved surface 110 is recessed toward the left and right sides, resulting in a curved low point 111. This low point 111 is the point farthest from the sound-emitting vertical plane 112. This low point 111 is positioned as close as possible to the center 120 of the plate, at a distance of 8.7 mm ± 2.5 mm from the center 120. The speaker planes of the main speaker 200, the first auxiliary speaker 300, and the second auxiliary speaker 400 are all tilted toward this low point 111. The speaker plane is a plane perpendicular to the speaker's axis. Tilt the speaker planes of each speaker toward this low point 111, with the low point 111 positioned as close as possible to the center 120 of the plate, to focus the sound toward the user's ears, reducing the sound propagation path and thus minimizing sound loss during ear-entry.

[0050] In this embodiment, the main speaker 200, the first auxiliary speaker 300, and the second auxiliary speaker 400 all have the same tilt angle 210. Using the same tilt angle 210 ensures uniformity in the sound propagation path characteristics of each speaker. If unequal tilt angles 210 were used, the tilt angles 210 would alter the propagation path, requiring different software processing schemes for different tilt angles 210 to improve sound quality. This increases software processing steps, resulting in sound delays and affecting the sound quality. Using the same tilt angle 210 ensures uniformity in the signal processing of each speaker, reduces processing steps, and improves sound response speed.

[0051] The tilt angle 210 in this embodiment can be 12.3°. By adopting this tilt angle 210, the thickness of the entire speaker plate 100 can be reduced while ensuring the uniformity of the sound propagation paths of each speaker, thereby reducing the volume of the entire earphone.

[0052] In this embodiment, the distances from the center point of the main speaker 200 to the lowest point 111 of the arc, the distances from the center point of the first auxiliary speaker 300 to the lowest point 111 of the arc, and the distances from the center point of the second auxiliary speaker 400 to the lowest point 111 of the arc are all equal in the left and right directions. This equal distance from the center point of each speaker to the lowest point 111 of the arc allows for precise adjustment of the data for each speaker, reducing mixing interference and sound cancellation during sound production. This ensures the sound is clean and strong, ensuring that the sound from all speakers is accurately focused into the ear canal, providing the most complete sound wave input and allowing the ear to hear all the details. The distance (height difference) from the center point of each speaker to the lowest point 111 of the arc is 12.4 mm. This ensures that the sound waves from each speaker are accurately focused into the ear canal while ensuring complete sound wave input, resulting in a better sound quality.

[0053] As shown in Figures 2 and 3, in this embodiment, the first auxiliary speaker 300 and the second auxiliary speaker 400 are respectively positioned on either side of the vertical centerline 130 of the speaker plate 100. The first auxiliary speaker is positioned in front of the vertical centerline, while the second auxiliary speaker is positioned behind it. This design ensures that the sounds emitted by the first and second auxiliary speakers are distinguishable, ensuring accurate sound playback and avoiding erroneous sound. The sounds of the first and second auxiliary speakers are also important elements in expressing sound layering, distance, and field. Maximizing distance and horizontal staggering ensures a perfect spatial reproduction of the sound.

[0054] In this embodiment, the first auxiliary speaker 300 and the second auxiliary speaker 400 are both located within a sealed cavity on the speaker plate 100. When each speaker is mounted on the speaker plate 100, a through-hole is formed on the curved surface of the speaker plate 100, allowing each speaker to be positioned within the through-hole and extending toward the back of the speaker plate 100. This allows sound to be emitted from the front of the speaker plate 100 and toward the through-hole. In this embodiment, the connection between the first auxiliary speaker 300 and the corresponding through-hole is sealed, and the connection between the second auxiliary speaker 400 and the corresponding through-hole is sealed. A sealing cover is placed outside each of the first auxiliary speaker 300 and the second auxiliary speaker 400. The sealing cover is located on the back of the speaker plate 100, forming a sealed cavity. This allows each speaker (or loudspeaker) to be positioned within the sealed cover and to be sealed and isolated from each other. This prevents interference between different sounds within the small cavity of the earphones, preventing airflow generated by the sounds emitted by the various speakers from interfering with each other. However, current multi-speaker headphones lack sealed isolation between the speakers. This results in airflow interference within the small cavity of the headphone when the speakers vibrate and produce sound, affecting the speakers' sound production efficiency and causing different sounds to interfere with each other. Therefore, a sealed cavity is provided on the speaker plate 100 to prevent airflow interference between the speakers' vibrations, solving the problems of crosstalk, sound mixing, and reduced sound production efficiency, further ensuring the sound quality of the headphones.

[0055] The speaker plate 100 of this embodiment is also provided with a tuning hole 150, which allows for fine-tuning of the sound before shipment, further ensuring the sound quality of the earphone. In this embodiment, at least three tuning holes 150 are provided, each located between two adjacent speakers.

[0056] As shown in Figures 2 and 3 , in the specific structure of this embodiment, the orthographic projection of the speaker plate 100 can be circular with a diameter of 90 mm. The main speaker 200 can use a Ø40 mm or Ø50 mm speaker. The first auxiliary speaker 300 and the second auxiliary speaker 400 have the same specifications and can use Ø20 mm or Ø30 mm speakers. The distance from the center of the main speaker 200 to the vertical centerline 130 is 6.2 mm, and the distance from the center of the main speaker 200 to the horizontal centerline 140 is 16.2 mm. The distance from the center of the first auxiliary speaker 300 to the vertical centerline 130 is 25.9 mm, and the distance from the center of the first speaker to the horizontal centerline 140 is 22.4 mm. The distance from the center of the second auxiliary speaker 400 to the vertical centerline 130 is 17.1 mm, and the distance from the center of the second speaker to the horizontal centerline 140 is 27.6 mm. These dimensions allow for a ±30% deviation to accommodate different personalized designs. Within the offset value range, a multi-channel fitting algorithm can be used to make matching adjustments to achieve the best acoustic effect. The above-mentioned speaker placement, speaker angle, speaker plate 100 arc surface and other data are designed based on ergonomics according to the size and shape of the headphones to ensure that the sound emitted by all speakers is accurately converged into the human ear canal, so that the human ear canal can obtain the most complete sound wave input and hear all the details of the sound.

[0057] Furthermore, the main speaker 200 has a sound pressure level of 110 ± 10 dB, a frequency response of 20 Hz to 20 kHz ± 10 dB, and a lowest resonant frequency of 80 Hz, making it a full-range speaker with a slight bias towards low frequencies. The first and second auxiliary speakers 300 and 400 have identical specifications. For example, the first auxiliary speaker 300 has a sound pressure level of 110 ± 10 dB, a frequency response of 20 Hz to 20 kHz ± 10 dB, and a lowest resonant frequency of 240 Hz, making it a mid-to-high-frequency speaker. These speaker specifications better match the characteristics of the aforementioned channels and complement the design of the curved surface 110 of the speaker plate 100, achieving a flatter frequency response for the output sound.

[0058] As another implementation:

[0059] As shown in FIG5 and FIG6, this embodiment further provides a driving method for a direct-push six-speaker headphone, comprising the steps of:

[0060] Step S100: Receive a multi-channel audio signal and separate each audio channel signal, wherein each audio channel includes at least: a subwoofer channel signal, a front center channel signal, a unidirectional front channel signal, a unidirectional side channel signal, and a unidirectional rear channel signal.

[0061] There are two groups of unidirectional front channel signals: the left front channel signal and the right front channel signal. There are two groups of unidirectional side channel signals: the left side channel signal and the right side channel signal. There are two groups of unidirectional rear channel signals: the left rear channel signal and the right rear channel signal.

[0062] Current multi-speaker headphones use a frequency divider between the speakers. This indiscriminately intercepts the mixed audio input signal and outputs it to the corresponding speaker. This can cause sound that shouldn't be heard on certain speakers to be sent to them, resulting in erroneous playback. Furthermore, the high impedance of the frequency divider increases the overall impedance of the headphones, reducing the sensitivity of the entire speaker and causing some sound details to be lost.

[0063] In this headset, a direct-push connector 500 (such as a USB port) is used to directly access multi-channel audio signals from an external audio output interface. By plugging the USB port into a computer, mobile phone, tablet, TV, or other device with a USB audio output interface, the multi-channel audio signal can be directly received from these devices without installing a driver. The USB port is either USB-A or USB-C (Type-C) and uses USB 1.0 / 2.0 / 3.0 / 3.1 data protocols and USB audio UAC 1.0 / 2.0 specifications to receive multi-channel audio and send it to a digital audio processor for data processing. It should be noted that in addition to using a USB port, the direct-push connector 500 can also use optical fiber, coaxial, or HDMI interfaces to obtain multi-channel data. By directly acquiring multi-channel audio signals, delay and distortion caused by the driver are reduced, preserving sound details as much as possible.

[0064] In home theaters or speaker amplifiers, each channel has its own independent speaker, and they're spaced a certain distance apart to prevent sound mixing and distortion. In headphone applications, because the space is very small, if this design uses independent speakers for each channel, the speakers will be very close together, causing audio signals to mix, resulting in sound distortion or cancellation, affecting the listening experience. Furthermore, if each channel has one speaker, then for a 7.1-channel setup, each headphone will have five speakers, for a total of ten. This will increase the size and weight of the headphones, and result in sound distortion. Therefore, the following steps can be used for optimization:

[0065] As shown in FIG5 , FIG6 , and FIG7 , in step S200 , each audio channel signal is individually characterized, and the three channels of the characterized processed heavy bass channel signal, the mid-front channel signal, and the unidirectional front channel signal are fitted as the main channel signal.

[0066] The input audio channel signals are processed by a multi-channel audio fitting algorithm. The multi-channel audio fitting algorithm parses the multi-channel audio signals sent from the USB interface and separates the data of each channel. The subwoofer channel signal, the center front channel signal, and the unidirectional front channel signal are then fitted into a single channel output, so that the eight-channel audio signal is output through the six speakers on the left and right sides respectively, thus achieving true multi-channel audio playback. Moreover, while achieving a true sound experience, the two front center speakers and two woofers are eliminated through channel fitting. The four redundant speakers on both sides are eliminated, reducing weight and cost, making the user feel light and less fatigued, allowing for long periods of listening and a pleasant experience.

[0067] In step S200, the steps of individually characterizing each audio channel signal specifically include:

[0068] Step S210: Based on the speaker's frequency response characteristics, the frequency points of the channel signal are supplemented using a spectral sub-algorithm to obtain a high-fidelity restoration signal. Specifically, based on the characteristics of each channel and the speaker specifications, the frequency band that the speaker can restore without distortion is intercepted, and the relevant frequency points are compensated based on the speaker's frequency response characteristics to create the basic conditions for high-fidelity sound restoration.

[0069] Step S220: Based on the speaker's position and tilt characteristics, the phase sub-algorithm adjusts the phase parameters of the high-fidelity restored signal to eliminate power cancellation and mixing caused by sound phase misalignment. Specifically, the phase of the sound is adjusted according to the characteristics of the speaker cavity design to correct phase errors or misalignments, preventing energy cancellation or loss that could affect the sound characteristics.

[0070] Step S230: Using the angle sub-algorithm, the phase-adjusted, high-fidelity restored signal is adjusted for sound angle, focusing the sound energy at the ears. Specifically, adjustments are made to the sound angle changes caused by speaker placement in the acoustic structure design, ensuring that the sound energy is focused at the ears and providing ergonomic adjustments.

[0071] Step S240: Based on the position angle and the temporal differences caused by signal processing, the delay sub-algorithm adjusts the temporal characteristics of the high-fidelity restored signal after the sound angle adjustment to synchronize the multi-channel sound entering the ear. Specifically, the temporal characteristics of each channel are adjusted within the entire sound playback architecture to restore the original spatial characteristics of the multi-channel sound.

[0072] Step S250: Using the gain sub-algorithm, the volume of the high-fidelity restored signal after time characteristic adjustment is adjusted to match the sensitivity of the corresponding speaker. Specifically, the volume of each channel is adjusted to match the sensitivity of each speaker, balancing the volume of each speaker and achieving a uniform sound energy effect.

[0073] The left, right, left rear, and right rear channels of the eight channels have similar characteristics, primarily used to convey the sound field's context, layering, orientation, and distance. Their frequency characteristics favor mid- and high-frequency ranges. These four channel signals undergo the aforementioned characterization processing based on the characteristics, layout, and position of their corresponding speakers, and are then directly output as left side channel signals, right side channel signals, left rear channel signals, and right rear channel signals, respectively. These signals can then be output through the first auxiliary speaker on the left, first auxiliary speaker on the right, second auxiliary speaker on the left, and second auxiliary speaker on the right, respectively.

[0074] The four channels of subwoofer, front center, left front, and right front are the most important parts of the audio signal. The subwoofer channel, front center channel, left front channel, and right front channel are not mixed with the above four channels. After the four channels of subwoofer, front center, left front, and right front are characterized by the above steps, the subwoofer channel, front center channel, and left front channel need to be fitted, and the subwoofer channel, front center channel, and right front channel need to be fitted. Taking one of the groups as an example, as shown in Figures 5, 6, and 8, step S200 also includes:

[0075] Step S260: Fit the three channels of the heavy bass channel signal, the mid-front channel signal, and the unidirectional front channel signal after the characteristic processing into the main channel signal.

[0076] In the specific process, the subwoofer channel represents the low-frequency portion of the audio, containing the greatest audio energy. Its frequency is typically below 200Hz. Improper subwoofer delivery can impact the speakers, causing distortion and distortion. Therefore, subwoofer processing requires special care. After characterization, it is sent to the fitter for fitting output. The mid-front channel is the core sound of the audio, representing a full-range signal with a frequency response range of 5Hz to 20kHz. Characterization is performed to achieve the flattest playback characteristics, and it is then sent to the fitter for fitting as the primary sound. The unidirectional front channel (left or right front channel) is the auxiliary main sound in multi-channel audio, and the overall sound field characteristics are expressed in the unidirectional front channel (left or right front channel). After characterization, the main sound field is restored and sent to the fitter for fitting output. Through the above-mentioned fitting algorithm, using a highly sensitive full-range speaker, based on the characteristics of the subwoofer channel, center front channel, and unidirectional front channel, combined with the speaker specifications, position layout, and the structure of the headphone speaker plate and cavity, a precise digital algorithm is used to fit the subwoofer channel, center front channel, and left front channel into the main channel signal on the left, which is output through the left main speaker. The subwoofer channel, center front channel, and right front channel are also fitted into the main channel signal on the right, which is output through the right main speaker. Combined with a highly sensitive, broadband main speaker, this achieves distortion-free sound playback, efficiently and accurately solving problems such as sound mixing interference, sound distortion, headphone weight, and headphone volume. This also reduces the overall cost of the headphones and makes multi-channel playback a reality in the headphone field.

[0077] Step S300: output the main channel signal to the main speaker on the corresponding side, output the characteristic-processed unidirectional side channel signal to the first auxiliary speaker on the corresponding side, and output the characteristic-processed rear channel signal to the second auxiliary speaker on the corresponding side.

[0078] As shown in Figure 9, the specific process uses independent direct channel drive, with the driver circuit outputting various channel signals to the corresponding speakers, thus achieving six-speaker direct drive in this headset. The driver circuit, consisting of a digital-to-analog converter 600 and a headphone amplifier 610, is a key component of the six-speaker direct drive. After processing the multi-channel fitting algorithm, the main channel signal is converted to an analog signal by the independent digital-to-analog converter 600. This signal is amplified by the headphone amplifier 610, becoming a low-impedance speaker drive signal that drives the main speaker 200 for mono playback. The sound output from the other speakers is the same as that of the main speaker 200. Therefore, in the headset, the sound from each channel is precisely delivered to the correct speaker, ensuring accurate playback and preventing erroneous sound. Simultaneously, the main channel signal, the unidirectional side channel signal, and the unidirectional rear channel signal are driven in independent drive modes, ensuring that no sound details are lost and the complete sound is fully reproduced, thus eliminating the problem of channel misrouting.

[0079] It should be noted that while the multi-channel design example in this embodiment is specifically described based on eight channels in a 7.1-channel audio system, the headphones in this embodiment are also suitable for processing 2-channel, 2.1-channel, 3.1-channel, and 5.1-channel audio formats, all of which have fewer channels than 7.1-channel. Therefore, when processing these formats, no signal is output for non-existent channels, which does not affect the use of the headphones.

[0080] In summary, this application proposes a direct-drive six-speaker headphone acoustic structure and driving method. Using direct signal transmission methods such as USB, multi-channel audio signals are directly acquired without the need for a driver, reducing driver-induced delays and distortion. Using a driver-free data acquisition method, audio signals are delivered to the ears with virtually no delay, maximizing the effectiveness of applications that rely on acoustic localization in competitive gaming, improving gamers' competitive abilities. By directly acquiring the multi-channel audio signal and fitting the subwoofer, mid-front, and unidirectional front channel signals into a single channel output, the eight-channel audio signal is output separately through six speakers on the left and right sides, achieving authentic multi-channel audio playback. Each channel of the multi-channel audio can be clearly played back through the six speakers, directing the sound to the correct speaker units, achieving high sound separation, clear playback, distortion-free playback, and accurate localization. This ensures that the original clarity, layering, spatial perception, and other panoramic elements of the sound are faithfully and perfectly presented, ensuring a realistic, comfortable, and transparent experience for the user. To achieve a realistic sound experience, the two front center speakers and two woofers were eliminated through channel alignment. This eliminated four redundant speakers on both sides, reducing weight and cost. This makes the earbuds feel lightweight and reduces fatigue, allowing for extended listening sessions with a relaxed and natural feel. The layout of three speakers on each side, along with the curved design of the speaker disc, ensures accurate multi-channel audio playback and precise input into the ear canal. Separate, enclosed cavities are used for the primary and secondary auxiliary speakers to prevent crosstalk and ensure accurate playback.

[0081] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An acoustic structure of a direct-push six-speaker headphone, characterized in that Comprising: Horn discs symmetrically arranged on the left and right sides respectively, and each of the horn discs on both sides is provided with: A main speaker for playing a main sound signal, which is synthesized by a subwoofer channel signal, a center front channel signal, and a single forward channel signal; A first auxiliary speaker for playing a single-sided side channel signal; A second auxiliary speaker for playing a single-sided rear channel signal; The center of the main speaker is arranged deviating from the center of the disc body of the horn disc, and the distance between the first auxiliary speaker and the main speaker is less than the distance between the second auxiliary speaker and the main speaker; Wherein, the center of the main speaker is located at the lower front of the center of the disc body, the center of the second auxiliary speaker is located at the upper front of the center of the disc body, the center of the second auxiliary speaker is located at the upper rear of the center of the disc body, and the distance from the center of the main speaker to the center of the disc body is less than the distance from the center of the first auxiliary speaker to the center of the disc body, and the distance from the center of the main speaker to the center of the disc body is less than the distance from the center of the second auxiliary speaker to the center of the disc body; The first auxiliary speaker and the second auxiliary speaker are both arranged in a sealed cavity on the horn disc. Among them, sealing covers are respectively arranged on the outer sides of the first auxiliary speaker and the second auxiliary speaker. The sealing covers are located on the back of the horn disc, and the sealing covers enclose the sealed cavity, so that each speaker is arranged in the sealing cover and sealed and isolated from each other.

2. The acoustic structure of the direct-push six-speaker headphone according to claim 1, characterized in that, The surface of the horn disc facing away from the sound-emitting side is set as an arc surface, and there is an arc low point on the arc surface; The horn planes of the main speaker, the first auxiliary speaker, and the second auxiliary speaker are all inclined towards the arc low point; 3. The acoustic structure of the direct-push six-speaker headset according to claim 2, wherein The inclination angles of the main speaker, the first auxiliary speaker, and the second auxiliary speaker are all equal.

4. The direct-push six-speaker headphone acoustic structure according to claim 3, characterized in that, In the left-right direction, the distances from the center points of the main speaker, the first auxiliary speaker, and the second auxiliary speaker to the arc low point are all equal.

5. The acoustic structure of the direct-push six-speaker headphone according to claim 1, characterized in that, The horn disc has a vertical use center line, and the first auxiliary speaker and the second auxiliary speaker are respectively arranged on both sides of the vertical use center line.

6. The direct-push six-speaker headphone acoustic structure according to claim 2, characterized in that, The sound pressure level of the main speaker is: 110±10dB, the frequency response is 20Hz - 20KHz±10dB, and the lowest resonance frequency is 80Hz; The first auxiliary speaker and the second auxiliary speaker have the same specifications. Among them, the sound pressure level of the first auxiliary speaker is: 110±10dB, the frequency response is 20Hz - 20KHz ±10dB, and the lowest resonance frequency is 240Hz.

7. A driving method for a direct-push six-speaker headphone, characterized in that For the direct-push six-horn headphone acoustic structure according to any one of claims 1-6, the driving method includes the steps: Receive a multi-channel audio signal and separate each audio channel signal, where each audio channel at least includes: a subwoofer channel signal, a center front channel signal, a single forward channel signal, a single side channel signal, and a single rear channel signal; Individually perform characterization processing on each audio channel signal, and fit the subwoofer channel signal, the center front channel signal, and the single forward channel signal after the characterization processing into a main channel signal; Output the main channel signal to the main speaker on the corresponding side, output the characterized single side channel signal to the first auxiliary speaker on the corresponding side, and output the characterized rear channel signal to the second auxiliary speaker on the corresponding side.

8. The driving method of the direct-push six-speaker headphone according to claim 7, wherein, The step of individually performing characterization processing on each audio channel signal specifically includes: Supplement the frequency points of the channel signal according to the frequency response characteristics of the speaker and through the spectrum sub-algorithm to obtain a high-fidelity restoration signal; According to the position and inclination characteristics of the speaker, adjust the phase parameters of the high-fidelity restoration signal through the phase sub-algorithm to eliminate power cancellation and mixing caused by sound phase misalignment; Adjust the sound emission angle of the high-fidelity restoration signal after phase adjustment through the angle sub-algorithm so that the energy of the sound is focused on the ears; Based on the time difference caused by the position angle and signal processing, adjust the time characteristics of the high-fidelity restoration signal after sound emission angle adjustment through the delay sub-algorithm so that the multi-channel sounds entering the ears are synchronized; Adjust the volume of the high-fidelity restoration signal after time characteristic adjustment through the gain sub-algorithm to adapt to the sensitivity of the corresponding speaker.

9. The driving method of the direct-push six-speaker headset according to claim 7, characterized in that In the step of receiving the multi-channel audio signal and separating each audio channel signal: directly obtain the multi-channel audio signal of the external audio output interface by using a USB interface.

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