CN117560604B

CN117560604B - A direct-push six-speaker headphone acoustic structure and driving method

Info

Publication number: CN117560604B
Application number: CN202311834092.9A
Authority: CN
Inventors: 黄伟; 李倩
Original assignee: Shenzhen Quanyin Lisheng Technology Co ltd
Current assignee: Shenzhen Quanyin Lisheng Technology Co ltd
Priority date: 2023-12-27
Filing date: 2023-12-27
Publication date: 2024-11-12
Anticipated expiration: 2043-12-27
Also published as: CN117560604A

Abstract

The application provides a direct-push type six-horn headphone acoustic structure and a driving method, comprising the following steps: horn discs which are symmetrically arranged at the left side and the right side are respectively provided with: the main loudspeaker is used for playing a main sound signal, and the main sound signal is formed by fitting a heavy bass channel signal, a middle front channel signal and a unidirectional front channel signal; a first auxiliary speaker for playing a unidirectional side channel signal; the second auxiliary speaker is used for playing the unidirectional back channel signal; the center of the main speaker is arranged away from the center of the disk body of the horn disk, 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. The problem of among the prior art adopt two sound channel sound output to play, lead to the playback effect of audio frequency poor is solved.

Description

Direct-push type six-horn headphone acoustic structure and driving method

Technical Field

The application relates to the technical field of audio playing equipment, in particular to a straight pushing type six-horn headphone acoustic structure and a driving method.

Background

Audio formats include 2 channels, 2.1 channels, 3.1 channels, 5.1 channels, and 7.1 channels, and are widely used for transmission and listening enjoyment in the fields of music, movies, games, and the like. Existing headphones are typically left and right speakers, or a multi-speaker design with a traditional divider frequency division, which is a stereo two channel mode. The multi-channel audio is mixed into two-channel sound output in a virtual mode, so that the playback of the multi-channel audio signal is absent, mixed and distorted, so that users can produce illusions and confusion in listening, and cannot hear real sound. Therefore, when the existing two-channel sound output is adopted for playing, the playback effect of the audio is poor.

Accordingly, the prior art is still in need of improvement and development.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present application aims to provide a direct-push type six-horn headphone acoustic structure and a driving method, which solve the problem that in the prior art, when two-channel sound output is adopted for playing, the playback effect of audio is poor.

In one aspect, the present application provides a push-through six-horn headphone acoustic structure comprising: horn discs which are symmetrically arranged at the left side and the right side are respectively provided with:

The main loudspeaker is used for playing a main sound signal, and the main sound signal is formed by fitting a heavy bass channel signal, a middle front channel signal and a unidirectional front channel signal;

a first auxiliary speaker for playing a unidirectional side channel signal;

the second auxiliary speaker is used for playing the unidirectional back channel signal;

The center of the main speaker is arranged away from the center of the disk body of the horn disk, 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.

Optionally, the surface of the horn disc, which is away from the sound producing side, is provided with an arc-shaped surface, and an arc-shaped low point is arranged on the arc-shaped surface;

The horn plane of the main loudspeaker, the horn plane of the first auxiliary loudspeaker and the horn plane of the second auxiliary loudspeaker are all obliquely arranged towards the arc-shaped low point.

Optionally, the inclination angles of the main speaker, the first auxiliary speaker and the second auxiliary speaker are all equal.

Optionally, in the left-right direction, a distance from a center point of the main speaker to the arc-shaped low point, a distance from a center point of the first auxiliary speaker to the arc-shaped low point, and a distance from a center point of the second auxiliary speaker to the arc-shaped low point are all equal.

Optionally, the horn disc has a vertical use center line, and the first auxiliary speaker and the second auxiliary speaker are disposed on both sides of the vertical use center line, respectively.

Optionally, the first auxiliary speaker and the second auxiliary speaker are each disposed in a sealed cavity on the horn disc.

Optionally, the sound pressure level of the main speaker is: 110+ -10 dB, the frequency response is 20Hz-20 KHz+ -10 dB, and the lowest resonance frequency is 80Hz;

The first auxiliary speaker and the second auxiliary speaker have the same specifications, wherein the sound pressure level of the first auxiliary speaker is: 110+ -10 dB, the frequency response is 20Hz-20 KHz+ -10 dB, and the lowest resonance frequency is 240Hz.

On the other hand, the application also provides a driving method of the direct-push type six-horn headphone, which comprises the following steps:

Receiving a multi-channel audio signal and separating out individual audio channel signals, wherein each audio channel comprises at least: a subwoofer channel signal, a center front channel signal, a one-way side channel signal, and a one-way back channel signal;

Performing characterization processing on each audio channel signal independently, and fitting three channels of a heavy bass channel signal, a middle front channel signal and a unidirectional front channel signal after the characterization processing into a main channel signal;

The main channel signal is output to the main speaker on the corresponding side, the one-way side channel signal after the characterization processing is output to the first auxiliary speaker on the corresponding side, and the rear channel signal after the characterization processing is output to the second auxiliary speaker on the corresponding side.

Optionally, the step of separately characterizing each audio channel signal specifically includes:

Aiming at the frequency response characteristic of the loudspeaker, supplementing frequency points of the channel signals through a frequency spectrum sub-algorithm to obtain high-fidelity restoring signals;

aiming at the position and dip angle characteristics of a loudspeaker, the phase parameters of the sound channel signals are adjusted through a phase sub-algorithm, and power offset and frequency mixing caused by sound phase dislocation are eliminated;

The sound-producing angle adjustment is carried out on the high-fidelity restored signal after the phase adjustment through an angle sub-algorithm, so that the energy of sound is focused on ears;

based on the position angle and the time difference caused by signal processing, the time characteristic of the high-fidelity restored signal with the sound production angle adjusted is adjusted through a delay sub-algorithm so as to synchronize multi-channel sounds entering ears;

And adjusting the volume of the high-fidelity restored signal after the time characteristic is adjusted through a gain sub-algorithm so as to adapt to the sensitivity of the corresponding loudspeaker.

Optionally, in the step of receiving the multi-channel audio signal and separating out the respective audio channel signals:

And directly acquiring a multichannel audio signal of an external audio output interface by adopting a USB interface.

The beneficial effects are that: according to the direct push type six-horn headphone acoustic structure and the driving method, after the multi-channel audio signals are directly obtained, the heavy bass channel signals, the middle front channel signals and the unidirectional front channel signals are fitted into one channel for output, so that the eight-channel audio signals are respectively output through six speakers at the left side and the right side, and real playback of the multi-channel audio is realized. Each channel of the multi-channel audio can be clearly played back through six loudspeakers, and the sound is sent to each correct loudspeaker unit, so that the effects of high sound separation degree, clear playback, no distortion and accurate positioning are achieved. The original panoramic elements such as definition, layering sense, space sense and positioning of the sound are truly and perfectly presented, and the user is ensured to have real, comfortable and transparent feeling. And under the condition of realizing real sound feeling, the two front middle speakers and the two bass speakers are canceled through fitting the sound channels, and the redundant four speakers are left and right together, so that the weight and the cost are reduced, the wearing feeling of a user is light, the fatigue feeling is reduced, and the user can listen for a long time, and is relaxed and natural.

Drawings

Fig. 1 is a schematic structural diagram of main parts of an acoustic structure of a direct-push six-horn headphone according to an embodiment of the present application;

FIG. 2 is an orthographic view of the main portion of a straight push six horn headphone acoustic structure on the sound emitting vertical plane, according to an embodiment of the present application;

FIG. 3 is a front projection view of a main portion of a straight push six horn headphone acoustic structure with an arcuate surface on the sound emitting vertical surface, in accordance with an embodiment of the present application;

FIG. 4 is a schematic diagram of the main parts of a straight push type six-horn headphone acoustic structure according to an embodiment of the present application;

FIG. 5 is a block flow diagram of main steps of a method for driving a direct push type six-horn headphone according to an embodiment of the present application;

Fig. 6 is a schematic diagram of an implementation principle of a driving method of a direct-push type six-horn headphone according to an embodiment of the present application;

Fig. 7 is a flow chart of a characterization process of unidirectional side channel signals and unidirectional back channel signals in a driving method of a direct push type six-horn headphone according to an embodiment of the present application;

FIG. 8 is a block flow diagram of a method for driving a direct push six-horn headphone according to an embodiment of the present application for characterizing and fitting a primary channel signal;

Fig. 9 is a schematic diagram of audio signal output in a driving method of a direct-push type six-horn headphone according to an embodiment of the present application.

In the figure: 100. a horn disc; 110. an arc surface; 111. arc low points; 112. sounding vertical surfaces; 120. the center of the tray body; 130. a midline is used vertically; 140. a horizontal use midline; 150. a tuning hole; 200. a main speaker; 210. an inclination angle; 300. a first auxiliary speaker; 400. a second auxiliary speaker; 500. a direct pushing joint; 600. a digital-to-analog converter; 610. a headphone amplifier.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear and clear, the present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

In the prior art, when two-channel sound output is adopted for playing, the problem of poor playback effect of audio exists. If full sound channel output is adopted, the loudspeaker is required to be arranged corresponding to each sound channel, so that ten loudspeakers are required to be arranged on the whole earphone, the number of loudspeakers on the earphone is large, the weight is large, the cost is high, and users are easy to fatigue after wearing for a long time. In addition, in the existing multi-channel output device, the adopted signal input interface generally only supports dual-channel output, a driver is required to be installed to support the input of multi-channel audio, and the driver is adopted to acquire a plurality of channel signals, so that the problems of large signal delay and poor user experience are caused. The scheme therefore proposes the following examples:

One embodiment is:

As shown in fig. 1, 6 and 8, the present embodiment proposes a direct push type six-horn headphone acoustic structure, which can play multi-channel audio, and specifically illustrates an example of audio in a 7.1 channel format, where the audio in the 7.1 channel format is divided into: a subwoofer channel signal, a center front channel signal, a left side channel signal, a left rear channel signal, a right front channel signal, a right side channel signal, a right rear channel signal, and a total of 8 channel signals. In an ideal state, the eight different speakers are arranged at the corresponding direction positions of the user, and the speakers at the different positions correspondingly play corresponding sound channel signals, so that an ideal sound playing effect can be realized. However, when the earphone is used in the earphone, the earphone has small volume and short receiving sound distance, so improvement is needed. As shown in fig. 1,2 and 4, the acoustic structure of the direct-push six-horn headphone in this embodiment mainly includes: the speaker discs 100 on the left and right sides are used for fixing speakers, and because the speaker discs 100 on the left and right sides and the speakers on the left and right sides are symmetrically arranged, the speaker disc 100 on one side is used for structural description, and multi-channel sound signals are classified, wherein the signals of the heavy bass channel and the signals of the middle front channel can be shared by the speakers on the left and right sides, the left and right channels are different, the left or right sides are represented by unidirectional directions, the left speaker of the earphone is used for description, the unidirectional directions are all the left side, the side of the speaker facing the ear of the user is the sounding side, the side of the speaker disc 100 facing the ear of the user is the sounding vertical plane 112, and the structural description is performed in the vertical state of the sounding vertical plane 112.

As shown in fig. 1,2 and 4, the horn disc 100 on both sides in this embodiment is provided with: a main speaker 200, a first auxiliary speaker 300, and a second auxiliary speaker 400. In a specific structure, the orthographic projection contour of the speaker disc 100 on the sounding vertical surface 112 may be a circle, an ellipse or a waist-shaped circle, when the earphone is worn, the whole speaker disc 100 covers the ear of the user, the center of the orthographic projection contour of the speaker disc 100 on the sounding vertical surface 112 is used as the disc center 120 of the structure, and when the earphone is used, the disc center 120 is aligned with the earhole of the user to be in an ideal wearing state. In the wearing state, the straight line passing through the center 120 of the disc body in the vertical direction is taken as a vertical use center line 130, and the straight line passing through the center 120 of the disc body in the horizontal direction is taken as a horizontal use center line 140, so that a rectangular coordinate system is formed, and the size of each horn in the present embodiment is defined based on the coordinate system.

The main speaker 200 in this embodiment is used for playing a main sound signal, the main sound signal is formed by fitting a subwoofer channel signal, a center-front channel signal and a unidirectional front channel signal, the first auxiliary speaker 300 is used for playing a unidirectional side channel signal, and the second auxiliary speaker 400 is used for playing a unidirectional rear channel signal. In the specific process, the main sound signals are formed by fitting the heavy bass channel signal, the middle front channel signal and the left front channel signal on the left side of the earphone, and the side main sound signals, the left side channel signal and the left back channel signal are respectively played through three speakers on the left side. On the right side of the earphone, the main sound signals are formed by fitting the heavy bass channel signal, the middle front channel signal and the right front channel signal, and the side main sound signals, the right side channel signal and the right back channel signal are respectively played through three speakers on the right side. The heavy bass channel signal and the middle front channel signal respectively participate in the channel fitting process of the left side and the right side, so that the audio playing of 8 channels in a 7.1 channel format can be realized through six loudspeakers.

As shown in fig. 2 and 4, in the present embodiment, on the orthographic projection of the horn disc 100 on the sound emission vertical plane 112, the center of the main speaker 200 is located away from the disc center 120 of the horn disc 100, the center of the main speaker 200 is located lower forward of the disc center 120, the center of the first auxiliary speaker 300 is located upper forward of the disc center 120, the center of the second auxiliary speaker 400 is located upper rearward of the disc center 120, and the distance from the center of the main speaker 200 to the disc center 120 is smaller than the distance from the center of the first auxiliary speaker 300 to the disc center 120, and the distance from the center of the main speaker 200 to the disc center 120 is smaller than the distance from the center of the second auxiliary speaker 400 to the disc center 120. So that the main speaker 200 is closer to the center of the tray 120 and the first auxiliary speaker 300 and the second auxiliary speaker 400 are farther from the center of the tray 120. The arrangement makes the playing path of the main sound signal towards the user's ear shorter, the playing sound clearer, and the unidirectional side channel signal played by the first auxiliary speaker 300 is close to the user's ear, so as to restore the sound effect input from the side, and restore the real effect of the unidirectional side channel signal. The second auxiliary speaker 400 performs the input of the unidirectional rear channel signal at the rear of the user's ear, so that the sound effect input from the rear can be restored, and the real effect of the unidirectional rear channel signal can be restored. The distance between the first auxiliary speaker 300 and the main speaker 200 is smaller than the distance between the second auxiliary speaker 400 and the main speaker 200; so that the distance that the first auxiliary speaker 300 propagates to the ear of the user is shorter than the second auxiliary speaker 400, thereby simulating the positional relationship of the first auxiliary speaker 300 on the side of the ear and the positional relationship of the second auxiliary speaker 400 on the rear side 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 disc 100 are matched with the directions of the sound of the respective channel signals, and different channel directions are reflected by the placement positions of the speakers in the headphone, so that a better playing effect is achieved.

As shown in fig. 1,2 and 5, in the acoustic structure of the direct push type six-horn headphone in this embodiment, after the multi-channel audio signal is directly obtained, for the output sound of one side, the heavy bass channel signal, the middle front channel signal and the unidirectional front channel signal of the side are fitted to be output as one channel, the unidirectional side channel signal of the side is output as one channel, and the unidirectional rear channel signal of the side is output as one channel. For the output sound of the other side, the heavy bass channel signal, the middle front channel signal and the unidirectional front channel signal of the other side are fitted into one channel to be output, the unidirectional side channel signal of the other side is independently output as one channel, and the unidirectional rear channel signal of the other side is independently output as one channel. Thus, the eight-channel audio signals are respectively output through six speakers at the left side and the right side, and the real playback of the multi-channel audio is realized. And the distribution positions of the main speaker 200, the first auxiliary speaker 300 and the second auxiliary speaker 400 on the speaker disc 100 are specially designed, so that six speakers can clearly play back each channel of multi-channel audio, and sound is sent to each correct speaker, and the effects of high sound separation degree, clear playback, no distortion and accurate positioning are achieved. The original panoramic elements such as definition, layering sense, space sense and positioning of the sound are truly and perfectly presented, and the user is ensured to have real, comfortable and transparent feeling. And under the condition of realizing real sound feeling, two front middle horns and two woofers are cancelled through fitting the sound channels, the redundant four horns are left and right skimmed together, the weight and the cost are reduced, the wearing feeling of a user is light, the fatigue is eliminated, and the listening for a long time is natural and real.

As shown in fig. 1, 3 and 4, further, the surface of the horn disc 100 facing away from the sound emission side in this embodiment is provided with an arc surface 110, and the arc surface 110 is recessed toward the outer side in the left-right direction, so as to have an arc low point 111, where the arc low point 111 is the point farthest from the sound emission vertical surface 112. The arc-shaped low point 111 is arranged as close to the center 120 of the tray body as possible, and the distance from the center 120 of the tray body can be 8.7mm +/-2.5; the horn plane of the main speaker 200, the horn plane of the first auxiliary speaker 300, and the horn plane of the second auxiliary speaker 400 are all inclined toward the arc-shaped low point 111. The horn plane of the loudspeaker is a plane perpendicular to the axis of the horn. The horn plane of each loudspeaker is obliquely arranged towards the arc-shaped low point 111, and the arc-shaped low point 111 is as close to the center 120 of the disc body as possible, so that sound is concentrated towards the ears of a user, the propagation route of the sound is reduced, and the loss of the sound in the propagation process of the sound entering the ears is reduced.

The inclination angles 210 of the main speaker 200, the first auxiliary speaker 300, and the second auxiliary speaker 400 in the present embodiment are all equal. The same inclination angle 210 is used to unify the characteristics of the sound propagation paths of the respective speakers. If the unequal inclination angles 210 are adopted, the inclination angles 210 change the propagation path, so that different schemes of different inclination angles 210 need to be processed in software to improve the sound quality, the software processing process is increased, and the sound delay is caused, so that the sound reflecting effect is influenced. The same inclination angle 210 is adopted, so that uniformity in the signal processing process of each loudspeaker is guaranteed, the processing process is reduced, and the sound response speed is improved.

The inclination angle 210 in this embodiment may be 12.3 °, and with this inclination angle 210, the thickness of the entire speaker disc 100 may be reduced, and the volume of the entire earphone may be reduced while ensuring uniformity of sound propagation paths of the respective speakers.

In the present embodiment, the distance from the center point of the main speaker 200 to the arc-shaped low point 111, the distance from the center point of the first auxiliary speaker 300 to the arc-shaped low point 111, and the distance from the center point of the second auxiliary speaker 400 to the arc-shaped low point 111 are all equal in the left-right direction. The distances from the center point of the loudspeaker to the arc-shaped low point 111 are equal, the data of each loudspeaker are precisely adjusted, the problems of mixing interference and sound cancellation can be reduced when the loudspeaker sounds, the cleanness and strength of sound are kept, the sound emitted by all the loudspeakers is ensured to be accurately converged into the auditory canal of a person, the auditory canal of the person is enabled to obtain the most complete sound wave input, and all details of the sound are heard. The distance (height difference) from the center point of the loudspeaker to the arc-shaped low point 111 is 12.4mm, so that the sound waves of each loudspeaker can be accurately converged into the auditory canal of a person while the complete sound wave input is obtained, and the sound effect is better.

As shown in fig. 2 and 3, in the present embodiment, the first auxiliary speaker 300 and the second auxiliary speaker 400 are disposed on both sides of the vertical use center line 130 of the horn stack 100, respectively. The first auxiliary loudspeaker is positioned at the front side of the vertical use center line, the second auxiliary loudspeaker is positioned at the rear side of the vertical use center line, and by adopting the design mode, the sound emitted by the first auxiliary loudspeaker and the sound emitted by the second auxiliary loudspeaker can be ensured to be distinguished, the accuracy of sound playback is ensured, and false sounding is avoided. The sound of the first auxiliary speaker and the second auxiliary speaker is also an important unit for representing sound level, distance and field sense, and the distance and the horizontal stagger are pulled to the maximum extent, so that the sound space sense can be played back perfectly.

The first auxiliary speaker 300 and the second auxiliary speaker 400 in this embodiment are both disposed in a sealed cavity on the speaker tray 100, and when each speaker is mounted on the speaker tray 100, a through hole is formed on the arcuate surface of the speaker tray 100, so that each speaker is located in the through hole and extends toward the back of the speaker tray 100, and sound is emitted from the front of the speaker tray 100 and is emitted toward the through hole, in this embodiment, the junction between the first auxiliary speaker 300 and the corresponding through hole is closed, and the junction between the second auxiliary speaker 400 and the corresponding through hole is closed. The outer sides of the first auxiliary speaker 300 and the second auxiliary speaker 400 are respectively provided with a sealing cover, the sealing covers are positioned on the back surface of the speaker disc 100, and the sealing covers enclose a sealing cavity, so that each speaker (speaker) is arranged in the sealing covers, and sealing isolation is carried out between the speakers. Therefore, in the small cavity of the earphone, the air flow generated by the sound emitted by each loudspeaker cannot be interfered, and the interference among different sounds is avoided. However, the prior multi-horn earphone is not sealed and isolated between the horns, which can cause mutual interference of air flow during vibration sounding of the horns in a small cavity of the earphone, thereby affecting sounding efficiency of the horns and causing mutual interference of different sounds. Therefore, the sealing cavity is arranged on the horn disc 100, so that mutual interference of horn vibration air flow is prevented, the problems of crosstalk, sound mixing and sound production efficiency reduction are solved, and the sound quality of the earphone is further ensured.

The tuning hole 150 is further provided on the speaker disc 100 of this embodiment, and fine tuning is performed through the tuning hole 150 when leaving the factory, so that the sounding quality of the earphone is further ensured. At least three tuning holes 150 are provided in this embodiment, and each tuning hole 150 is located between two adjacent speakers.

As shown in fig. 2 and 3, in a specific structure of this embodiment, the front projection of the horn disc 100 may be circular, and the diameter is 90mm. The main speaker 200 may be a 40mm or 50mm diameter horn. The first auxiliary speaker 300 and the second auxiliary speaker 400 have the same specifications, and a horn having a diameter of 20mm or 30mm may be used. The distance from the center of the main speaker 200 to the vertical center line 130 is 6.2mm, and the distance from the center of the main speaker 200 to the horizontal center line 140 is 16.2mm; the distance from the center of the first auxiliary speaker 300 to the vertical center line of use 130 is 25.9mm and the distance from the center of the first speaker to the horizontal center line of use 140 is 22.4mm; the distance from the center of the second auxiliary speaker 400 to the vertical center line of use 130 is 17.1mm and the distance from the center of the second speaker to the horizontal center line of use 140 is 27.6mm. The above dimensions allow an offset within + -30% to accommodate different personalized designs. In the range of the offset value, the data of the loudspeaker placement position, the loudspeaker angle, the cambered surface of the loudspeaker disc 100 and the like can be matched and adjusted by utilizing a multichannel fitting algorithm so as to achieve the optimal acoustic effect, and the data is designed according to the size and the shape of the earphone on the basis of human engineering, so that the sound emitted by all loudspeakers is ensured to be accurately converged into the auditory canal of a person, the auditory canal of the person is enabled to obtain the most complete acoustic wave input, and all details of the sound are heard.

Further, the sound pressure level of the main speaker 200 is: 110+ -10 dB, the frequency response is 20Hz-20 KHz+ -10 dB, the lowest resonance frequency is 80Hz, and the loudspeaker is a full-frequency loudspeaker with slightly lower frequency. The first auxiliary speaker 300 and the second auxiliary speaker 400 have the same specifications, and the sound pressure level of the first auxiliary speaker 300 is: 110+ -10 dB, the frequency response is 20Hz-20 KHz+ -10 dB, the lowest resonance frequency is 240Hz, and the middle and high frequency loudspeaker is high. The speaker with the above specification is more matched with the characteristics of the above sound channels, and is matched with the designed shape of the arc-shaped surface 110 of the speaker disc 100, so as to realize the frequency response characteristic of flatter output sound.

As another embodiment:

As shown in fig. 5 and 6, the present embodiment further provides a driving method of a direct-push type six-horn headphone, including the steps of:

Step S100, receiving multi-channel audio signals, and separating out each audio channel signal, where each audio channel at least includes: a subwoofer channel signal, a center front channel signal, a one-way side channel signal, and a one-way back channel signal.

Wherein the unidirectional front channel signals are two groups, namely a left front channel signal and a right front channel signal. The unidirectional side channel signals are two groups, namely a left side channel signal and a right side channel signal. The unidirectional back channel signals are two groups, namely a left back channel signal and a right back channel signal.

In the existing multi-horn earphone, a frequency divider mode is adopted between the horns, an indiscriminate intercepted signal is output to a corresponding horn from a mixed audio input signal, and sound which should not appear in some horns is also transmitted to the horn, so that error playback of the sound is caused. Meanwhile, the impedance of the frequency divider is larger, so that the overall impedance of the earphone is increased, the sensitivity of the whole loudspeaker is reduced, and details of some sounds are lost.

In the present earphone, the direct push connector 500 (e.g. USB interface) is used to directly obtain the multi-channel audio signal of the external audio output interface. Through USB interface, insert computer, mobile phone, tablet, television or other equipment with USB audio output interface, need not to install the driver program, receive the audio signal of multichannel from these equipment directly. The USB interface is in A USB-A or USB-C (Type-C) mode, adopts USB1.0/2.0/3.0/3.1 datA protocol and USB audio UAC1.0/2.0 specification, receives multi-channel audio, and sends the multi-channel audio to the digital audio processor for datA processing. It should be noted that, the direct push connector 500 may be an optical fiber, coaxial or HDMI interface, or the like, in addition to a USB interface, to obtain multi-channel data. By directly acquiring the multi-channel audio signal, delay and distortion caused by a driver are reduced, and sound details are kept as much as possible.

In a home theater or a speaker power amplifier, each channel is an independent speaker, and a certain distance is ensured to prevent distortion caused by mixing interference of sound. In the application of the earphone, because the space of the earphone is very small, if the design of the independent loudspeaker of each sound channel is adopted, the distance between each loudspeaker is very close, the audio signals can generate frequency mixing, so that the distortion or cancellation of sound can be caused, the listening feeling is influenced, meanwhile, one loudspeaker of each sound channel can generate 5 loudspeakers on each side of the earphone under the requirement of 7.1 sound channels, and the two sides of the earphone have 10 loudspeakers, so that the problems of volume increase, weight aggravation, sound effect distortion and the like of the earphone can be caused. Therefore, the following steps are adopted to perform the optimization process:

As shown in fig. 5, 6 and 7, step S200 performs the characterization process on each audio channel signal individually, and fits the three channels of the subwoofer channel signal, the center-front channel signal and the unidirectional front channel signal after the characterization process to the main channel signal.

And processing the input audio channel signals through a multichannel audio fitting algorithm, and analyzing the multichannel audio signals sent by the USB interface by the multichannel audio fitting algorithm to separate out the data of each channel. And fitting the heavy bass channel signal, the middle front channel signal and the unidirectional front channel signal into one channel for output, so that the eight-channel audio signals are respectively output through six speakers at the left side and the right side, and the real playback of the multi-channel audio is realized. And under the condition of realizing real sound feeling, two front middle horns and two woofers are cancelled through fitting the sound channels, and the redundant four horns are left and right skimmed together, so that the weight and the cost are reduced, the wearing feeling of a user is light, the fatigue feeling is reduced, the user can listen for a long time, and the human heart is pleasant.

In the step S200, the step of performing the characterization process on each audio channel signal individually specifically includes:

Step S210, aiming at the frequency response characteristic of the loudspeaker, supplementing frequency points of the channel signals through a frequency spectrum sub-algorithm, and obtaining high-fidelity restoring signals. The method comprises the following steps: according to the characteristics of each sound channel and the specification of the loudspeaker, intercepting the frequency band of the loudspeaker which can be restored without distortion, compensating relevant frequency points according to the frequency response characteristics of the loudspeaker, and constructing the basic condition of high-fidelity restoration of sound.

Step S220, aiming at the position and inclination angle characteristics of the loudspeaker, the phase parameters of the high-fidelity restoring signal are adjusted through a phase sub-algorithm, and power offset and frequency mixing caused by sound phase dislocation are eliminated. The method comprises the following steps: according to the characteristics of the design of the loudspeaker cavity, the phase of the sound is adjusted, phase errors or misplacement are corrected, and the cancellation or the loss of energy is prevented, so that the characteristics of the sound are influenced.

And step S230, performing sounding angle adjustment on the high-fidelity restored signal after the phase adjustment through an angle sub-algorithm so as to focus the energy of sound to ears. The method comprises the following steps: and adjusting the sound production angle change caused by the placement of the loudspeaker of the acoustic structure design, ensuring that the energy of sound is focused on ears, and performing ergonomic adjustment and adaptation.

Step S240, based on the position angle and the time difference caused by the signal processing, the time characteristic of the high-fidelity restored signal after the sound production angle adjustment is adjusted through a delay sub-algorithm so as to synchronize the multi-channel sound entering the ears. The method comprises the following steps: aiming at the characteristics of different sound channels, the time characteristics of the sound playback architecture are adjusted in the whole sound playback architecture, so that the original spatial characteristics of multiple sounds are created.

Step S250, the volume of the high-fidelity restored signal with the time characteristic adjusted is adjusted through a gain sub-algorithm so as to adapt to the sensitivity of the corresponding loudspeaker. The method comprises the following steps: the volume of each sound channel is adjusted to adapt to the sensitivity of each loudspeaker, so that the volume of each loudspeaker is balanced, and the effect of uniform sound energy is achieved.

The left side channel, the right side channel, the left back channel and the right back channel in the 8 channels have similar characteristics and are mainly used for expressing scenes, layers, azimuth, distances and the like of a sound field. The frequency characteristics are biased towards medium and high frequencies. The four-channel signals are subjected to the above characterization processing according to the characteristics, layout and position relation of the corresponding speakers, and then the left-side channel signal, the right-side channel signal, the left-rear channel signal and the right-rear channel signal are directly output. And can be output through the first auxiliary speaker on the left side, the first auxiliary speaker on the right side, the second auxiliary speaker on the left side, and the second auxiliary speaker on the right side, respectively.

The four channels, heavy bass, center front, front left and front right, are the most dominant parts of the audio signal. The subwoofer channel, the center front channel, the left front channel, and the right front channel are not mixed with any of the four channels. After the four channels of the subwoofer, the middle front channel, the left front channel and the right front channel are respectively subjected to the characterization processing through the steps, fitting processing is required to be performed on the subwoofer channel, the middle front channel and the left front channel, and fitting processing is required to be performed on the subwoofer channel, the middle front channel and the right front channel. Taking one group as an example, as shown in fig. 5, 6 and 8, step S200 further includes:

Step S260, fitting the three channels of the characteristic treated subwoofer channel signal, the center front channel signal and the unidirectional front channel signal to a main channel signal.

In a specific process, the subwoofer is a low-frequency part of the audio, contains the maximum energy of the audio, and is usually below 200Hz, and the subwoofer is wrongly distributed, so that the loudspeaker can be impacted, and the sound is distorted and distorted. Therefore, the process of the heavy bass sound requires special care, and the characteristic process is then carried out and then sent to a fitting device for fitting and outputting. The front-center channel is the main soul of the audio frequency and is a full-frequency signal with the frequency response ranging from 5Hz to 20 KHz. After the characterization processing, the flattest characteristic of playback is achieved, and the characteristic is sent out as a dominant sound fitting in a fitter. The unidirectional front channel (left front channel or right front channel) is a secondary dominant sound of the multi-channel audio, and the sound field characteristics of the entire sound are represented in the unidirectional front channel (left front channel or right front channel). After the characterization processing, the main field of the sound is restored, and the main field is sent to a fitting device for fitting and outputting. Through the fitting algorithm, the high-sensitivity full-frequency loudspeaker is adopted, and according to the characteristics of the heavy bass channel, the middle front channel and the unidirectional front channel, the specification index and the position layout of the loudspeaker are combined, the structures of the earphone loudspeaker disc and the cavity are used for fitting the three channels of the heavy bass channel, the middle front channel and the left front channel into left main channel signals in a digital algorithm accurate mode, and the left main channel signals are output through a left main loudspeaker. Fitting the three channels of the heavy bass channel, the middle front channel and the right front channel into a main channel signal on the right side, and outputting the main channel signal through a main loudspeaker on the right side. By combining the main speaker with high sensitivity and wide frequency response, the sound can be played back without distortion, the problems of sound mixing interference, sound distortion, earphone weight, earphone volume and the like are effectively and accurately solved, and meanwhile, the overall cost of the earphone is reduced, so that multichannel playback can be realized in the earphone field.

Step S300, outputting the main channel signal to the main speaker on the corresponding side, outputting the unidirectional side channel signal after the characterization processing to the first auxiliary speaker on the corresponding side, and outputting the rear channel signal after the characterization processing to the second auxiliary speaker on the corresponding side.

As shown in fig. 9, in a specific process, a mode of independent direct driving of sound channels is adopted, and various sound channel signals are output to corresponding speakers by a driving circuit, so that six-horn direct pushing of the earphone is realized. The driving circuit is composed of a digital-to-analog converter 600 and an earphone amplifier 610, and is an important mode of six-horn direct-pushing. The main channel signal processed by the multi-channel fitting algorithm is converted into an analog signal by an independent digital-analog converter 600, amplified by an earphone amplifier 610, and becomes a low-impedance loudspeaker driving signal to push the main speaker 200 to perform mono playing, and in addition, the sound output mode of other speakers is the same as that of the main speaker 200. Therefore, in the earphone, the sound of each channel is accurately sent to the correct speaker, ensuring the accuracy of sound playback, avoiding false sound production; meanwhile, the main channel signal, the unidirectional side channel signal and the unidirectional back channel signal are driven in independent driving modes respectively, sound details cannot be lost, complete sound is completely reproduced, and the problem of wrong channel conveying is solved.

It should be noted that: the multi-channel design example in this embodiment is specifically described based on 8 channels of 7.1 channels, and the headphones of this embodiment are equally applicable to processing of 2 channel, 2.1 channel, 3.1 channel, and 5.1 channel audio, and the number of channels in these channel formats is smaller than 7.1 channels. Therefore, in the processing of these channel formats, no signal is output for the channels which do not exist, and no signal output is performed, so that the use of the earphone is not affected.

In summary, the present application provides a direct-push type six-horn headphone acoustic structure and a driving method thereof. The direct transmission mode of signals such as USB is adopted, a driver is not needed to directly acquire multi-channel audio signals, and delay and distortion caused by the driver are reduced. The data acquisition mode without a driver is adopted, and the audio signal is almost sent to the ears without delay, so that the audio signal is best played by the application of hearing positioning in the competitive game, and the competitive ability of a game player is improved. After the multi-channel audio signals are directly obtained, the heavy bass channel signals, the middle front channel signals and the unidirectional front channel signals are fitted into one channel to be output, so that the eight-channel audio signals are respectively output through six speakers at the left side and the right side, and real playback of the multi-channel audio is realized. Each channel of the multi-channel audio can be clearly played back through six loudspeakers, and the sound is sent to each correct loudspeaker unit, so that the effects of high sound separation degree, clear playback, no distortion and accurate positioning are achieved. The original panoramic elements such as definition, layering sense, space sense and positioning of the sound are truly and perfectly presented, and the user is ensured to have real, comfortable and transparent feeling. And under the condition of realizing real sound feeling, two front middle horns and two woofers are cancelled through fitting the sound channels, and the redundant four horns are left and right skimmed together, so that the weight and the cost are reduced, the wearing feeling of a user is light, the fatigue feeling is reduced, the user can listen for a long time, and the user feel relaxed and natural. The layout of the three speakers on the left and right sides and the cambered surface design of the speaker disc enable multichannel audio to be correctly played back and accurately input into the auditory canal. And independent closed cavities are adopted for the first auxiliary loudspeaker and the second auxiliary loudspeaker, so that crosstalk between channels is prevented, and the accuracy of channel playback is ensured.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A direct push six horn headphone acoustic structure, comprising: horn discs which are symmetrically arranged at the left side and the right side are respectively provided with:

a first auxiliary speaker for playing a unidirectional side channel signal;

a second auxiliary speaker for playing a unidirectional back channel signal;

The center of the main speaker is deviated from the center of the disk body of the horn disk, 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;

wherein the center of the main speaker is positioned at the lower front of the center of the tray body, the center of the second auxiliary speaker is positioned at the upper rear of the center of the tray body, the distance from the center of the main speaker to the center of the tray body is smaller than the distance from the center of the first auxiliary speaker to the center of the tray body, and the distance from the center of the main speaker to the center of the tray body is smaller than the distance from the center of the second auxiliary speaker to the center of the tray body;

The first auxiliary speaker and the second auxiliary speaker are arranged in a sealing cavity on the speaker disc, wherein sealing covers are respectively arranged on the outer sides of the first auxiliary speaker and the second auxiliary speaker, the sealing covers are positioned on the back surface of the speaker disc, and the sealing covers enclose the sealing cavity, so that the speakers are arranged in the sealing covers, and sealing isolation is carried out between the speakers.

2. The direct push six horn headphone acoustic structure of claim 1, wherein the surface of the horn disc facing away from the sound producing side is provided with an arcuate surface having an arcuate low point thereon;

the horn plane of the main speaker, the horn plane of the first auxiliary speaker and the horn plane of the second auxiliary speaker are all obliquely arranged towards the arc-shaped low point.

3. The push-through six horn headphone acoustic structure of claim 2, wherein the tilt angles of the primary speaker, the first auxiliary speaker, and the second auxiliary speaker are all equal.

4. A push-through six horn headphone acoustic structure according to claim 3, wherein the distance from the center point of the main speaker to the arc-shaped low point, the distance from the center point of the first auxiliary speaker to the arc-shaped low point, and the distance from the center point of the second auxiliary speaker to the arc-shaped low point are all equal in the left-right direction.

5. The push-through six horn headphone acoustic structure of claim 1 wherein the horn disc has a vertical use centerline, the first auxiliary speaker and the second auxiliary speaker being disposed on either side of the vertical use centerline, respectively.

6. The direct push six horn headphone acoustic structure of claim 2, wherein the sound pressure level of the primary speaker is: 110+ -10 dB, the frequency response is 20Hz-20 KHz+ -10 dB, and the lowest resonance frequency is 80Hz;

The first auxiliary speaker and the second auxiliary speaker have the same specification, wherein the sound pressure level of the first auxiliary speaker is: 110+ -10 dB, the frequency response is 20Hz-20 KHz+ -10 dB, and the lowest resonance frequency is 240Hz.

7. A method of driving a direct push six horn headphone, for use in a direct push six horn headphone acoustic structure as claimed in any one of claims 1 to 6, the method comprising the steps of:

8. The method for driving a direct push type six horn headphone according to claim 7, wherein the step of performing the characterizing process on each audio channel signal individually specifically comprises:

aiming at the position and inclination angle characteristics of a loudspeaker, the phase parameters of the high-fidelity restoring signals are adjusted through a phase sub-algorithm, and power offset and frequency mixing caused by sound phase dislocation are eliminated;

And adjusting the volume of the high-fidelity restored signal after the time characteristic adjustment through a gain sub-algorithm so as to adapt to the sensitivity of the corresponding loudspeaker.

9. The method of driving a push-through six-horn headphone according to claim 7, wherein the step of receiving the multi-channel audio signals and separating out the respective audio channel signals comprises: